Andrew Orr

Climate Physicist

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Atmosphere, Ice and Climate team

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Andrew Orr

Climate Physicist

Biography

I work within the Atmospheric, Ice and Climate team of the British Antarctic Survey (BAS), carrying out research into the processes responsible for climate variability and change in the polar regions, Himalayas, and Andes. This is important because these regions are particularly vulnerable to a wide range of climate change impacts This is predominately achieved using regional atmosphere models and global climate models.
Research Interests

Regional climate modelling.
Interactions between the atmosphere and the cryosphere in the polar regions, especially Antarctica.
Hydroclimate and meteorology of mountain regions, especially the Himalayas and Andes.
The dynamical response of the atmosphere to the Antarctic ozone hole.
Mountain wave-induced polar stratospheric clouds (PSCs).

Supervision of students

2023-present Isabelle Sangha, PhD (with University of Cambridge) “The impact of polar stratospheric clouds when modelling the future recovery of the polar ozone layer” (Primary Supervisor).
2023-present Sarah Taylor, PhD (with University of Bristol) “Atmosphere-cryosphere interactions in Antarctica” (Primary Supervisor).
2023-present Luisa Aviles, PhD (with University of Leeds) “Atmospheric Rivers and their impacts on the stability of West Antarctic ice shelves” (Co-supervisor).
2023 Oliver Bradley, Summer Research Experience “Using climate models to estimate how snow and rain in the Antarctic will change in a warming world” (Primary supervisor).
2022-present Chittella Sai Prabala Swetha, PhD (with Indian Institute of Technology, Kharagpur) “Mass balance of West Antarctica” (Joint-supervisor).
2021 Nicolaj Hansen, Three month student visit as part of PhD, from Danish Meteorological Institue.
2020-present Marc Girona-Mata, PhD (with University of Cambridge) “A machine learning approach to mapping local-scale hydro-meteorological regimes in the Himalayas ” (Primary supervisor).
2020-present Kenza Tazi, PhD (with University of Cambridge) “Local alpine precipitation from large-scale data: a probabilistic machine learning approach” (Co-supervisor).
2016 – 2020 Ella Gilbert, PhD (with University of East Anglia) “Melting of the ice shelves around the Antarctic Peninsula” (Primary supervisor).
2015-2019 Emily Potter, PhD (with University of Cambridge) “What are the fundamental processes when atmospheric flow interacts with localised orography in valleys in the Himalayas” (Primary supervisor).
2019 Aymeric Delon, Masters (visiting from University of Paris-Saclay) “Study of mountain-wave-induced stratospheric cooling over the Antarctic Peninsula using a parameterisation scheme in the UM-UKCA chemistry climate model” (Co-supervisor).
2016-2017 Zoran Kaufmann, Masters (visiting from École Polytechnique Fédérale de Lausanne) “The effects of ozone depletion, increased greenhouse gas emissions, and increased aerosols on precipitation in High-Mountain Asia” (Primary supervisor).
2015 Margaux Couttet, Masters (visiting from École Polytechnique Fédérale de Lausanne) “Intercomparison of four cloud microphysics schemes in the Weather Research and Forecasting (WRF) model for the simulation of summer monsoon precipitation in Langtang Valley, Himalayas” (Primary supervisor).
2013-present Richard Jones, PhD (with University of East Anglia) “Weather and climate in the Amundsen Sea Embayment, Antarctica” (Co-supervisor).
2009-2013 Andy Elvidge, PhD (with University of East Anglia) “Mesoscale modelling of foehn flow across the Antarctic Peninsula” (Co-supervisor).

Postdoctoral research assistants

2023-present, Siddarth Gumber, The Big Thaw: gauging the past, present, and future of our moutain water resources, NERC Highlight Topic award.
2022-present, Ruth Price, Polar Regions in the Earth System (PolarRES), EU Horizon 2020 award.
2022-present, Ella Gilbert, Polar Regions in the Earth System (PolarRES), EU Horizon 2020 award.
2020, Joseph Ulanowski, Measuring cloud properties from meteorological radiosondes in India, NERC International Development Innovation and Impact Award.
2019-2020, Emily Potter, Peruvian Glacier Retreat and its impact on Water Resources (Peru-GROWS), NERC/CONCYTEC award.
2016-2018, Daniel Bannister, Sustaining Himalayan Water Resources in a Changing Climate (SusHi-Wat), NERC Newton Sustaining Water Resources award.
2015-2018, James Pope, Poles apart: why has Antarctic sea-ice increased, and why can’t coupled climate models reproduce observations?, NERC standard grant.
2014-2018, Pranab Deb, Improved prediction of 21st century West Antarctic climate change: the role of the Amundsen Sea Low, NERC standard grant.

Previous appointments and Education

2005-2008 Consultant, European Centre for Medium-Range Weather Forecasting (ECMWF): Researching the role of orography (resolved and sub-grid) in the ECMWF forecast system, and on the parameterisation of non-orographic gravity waves.
2001-2005 Post-doctoral researcher, University College London: Modelling of atmosphere/ocean/sea-ice processes in the polar regions.
1996-2000 PhD Kings College, London. Radio Physics.
1995 B.Sc. University of Edinburgh. Physics (1st class Honours).

Teaching / Training

2023 Guest lecturer on climate modelling (two lectures), University of Durham, Durham, UK.
2018 Guest lecturer on climate change (four lectures), Vellore Institute of Technology (VIT), India.
2012 Subject Knowledge Update: Antarctica’s changing climate and implications for the UK, Royal Geographical Society, London.
2005-2010 Parameterization of orographic related momentum fluxes in a numerical weather processing model (two lectures), Training course on parameterization of subgrid physical processes, ECMWF.

2024

94) Swetha Chitella, S. P., A. Orr, P. Deb, and R. Jones (2024), Radiosonde measurements and Polar WRF simulations of low-level wind jets in the Amundsen Sea Embayment, West Antarctica, Adv. Atmos. Sci., under review.

93) Muszynski, G., A. Orr, I. Roy, G. Di Capua, H. Pritchard, and J. S. Hosking (2024), Using a causal effect network approach to quantify linkages between ENSO teleconnections, regional circulation fields, and summer monsoon precipitation over the Himalayas, J. Roy. Met. Soc., under review.

92) Girona-Mata, M., A. Orr, M. Widmann, D. Bannister, D. Ghulam Hussain, S Hosking, J. Norris, D. Ocio, T. Phillips, J. Steiner, and R. E. Turner (2024), Probabilistic precipitation downscaling for ungauged mountain sites: a pilot study for the Hindu Kush Karakoram Himalaya, Hydrol. Earth Syst. Sci., EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-2805, under reivew.

91) Fyffe, C. L., E. Potter, E. Miles, T. E. Shaw, M. McCarthy, A. Orr, E. Loarte, K. Medina, S. Fatichi, R. Hellström, M. Baraer, E. Mateo, A. Cochachin, M. Westoby, and F Pellicciotti (2024), Snow is important too: the snowfall dynamics and contribution of snow melt and ice melt to runoff in the Peruvian Andes, Environ. Res. Lett., under review.

90) Price, R., A. Orr, P. F. Field, G. Mace, and A. Protat (2024), Simulation of Southern Ocean cloud processes using the high-resolution regional UK Met Office Unified Model with interactive aerosols, J. Geophys. Res., under review.

89) Gilbert, E., D. Pishniak, J. A. Torres, A. Orr, M. Maclennan, N. Wever, and K. Verro (2024), Extreme precipitation associated with atmospheric rivers over West Antarctic ice shelves: insights from kilometre-scale regional climate modelling, The Cryosphere, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-2111, under review.

88) Deb, P., D. Bromwich, A. Orr, A. Sena, and K. R. Clem (2024), Recent surge in surface melting of West Antarctic ice shelves linked to Interdecadal Pacific Oscillation, Commun. Earth Environ., under review.

87) Tazi, K., A. Orr, J. Hernandez-González, S. Hosking, and R. Turner (2024), Downscaling Precipitation in High Mountain Asia using Multi-Fidelity Gaussian Processes: Improved Estimates from ERA5, Hydrol. Earth Syst. Sci., EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2145, under review.

86) Bharati, P., P. Deb, K. M. R. Hunt, A. Orr, M. K. Dash (2024), ENSO-induced latitudinal variation of the subtropical jet modulates extreme winter precipitation over the Western Himalaya, Adv. Atmos. Sci., in press.

85) Hansen, N., A. Orr, X. Zou, F. Boberg, T. J. Bracegirdle, E. Gilbert, P. L. Langen, M. A. Lazzara, R. Mottram, T. Phillips, R. Price, S. B. Simonsen, and S. Webster (2024), The importance of cloud phase when assessing surface melting in an offline coupled firn model over Ross Ice shelf, West Antarctica, The Cryosphere, https://doi.org/10.5194/tc-18-2897-2024.

84) Angus, M., M. Widmann, A. Orr, R. Ashrit, G. C. Leckebusch, and A. Mitra (2024), A comparison of two statistical postprocessing methods for heavy precipitation forecasts over India during the summer monsoon, Q. J. Roy. Met. Soc., 1–19, https://doi.org/10.1002/qj.4677.

83) Levine, X., R. Williams, G. Marshall, A. Orr, L. S. Graff, D. Handorf, A. Karpechko, R. Köhler, R. Wijngaard, N. Johnston, H. Lee, L. Nieradzik, and P. Mooney (2024), Storylines of Summer Arctic climate change constrained by Barents-Kara Sea and Arctic tropospheric warming for climate risks assessment, Earth Syst. Dynam., 15, 1161–1177, https://doi.org/10.5194/esd-15-1161-2024.

82) Williams, R. S., G. Marshall, X. Levine, L. S. Graff, D. Handorf, N. Johnston, A. Karpechko, A. Orr, W. J. van de Berg, R. Wijngaard, and P. Mooney (2024), Antarctic climate change from CMIP6 models, based on storylines of future sea ice loss and stratospheric polar strength, J. Clim., 37, 2157–2178, https://doi.org/10.1175/JCLI-D-23-0122.1.

2023

81) Orr, A., P. Deb, K. Clem, E. Gilbert, D. Bromwich, F. Boberg, S. Colwell, N. Hansen, M. Lazzara, P. Mooney, R. Mottram, N. Niwano, T. Phillips, D. Pishniak, C. Riejmer, W. J. van de Berg, S. Webster, and X. Zou (2023), Characteristics of surface “melt potential” over Antarctic ice shelves based on regional atmospheric model simulations of summer air temperature extremes from 1979/80 to 2018/19, J. Clim., 36, 3357–3383, https://doi.org/10.1175/JCLI-D-22-0386.1.

80) Orr, A., Policy-relevant science highlights from the Antarctic CORDEX project, World Meteorological Organisation Antarctic Treaty Paper, 2023, https://www.ats.aq/devAS/Meetings/Documents/95.

79) Lu, H., A. Orr, J. King, T. Phillips, E. Gilbert, S. Colwell, and T. Bracegirdle, Extreme warm events in the South Orkney Islands, Southern Ocean: Compounding influence of atmospheric rivers and fohn conditions, Q. J. Roy. Met. Soc., 1-24, http://doi.org/10.1002/qj.4578.

78) Potter, E. R., C. L. Fyffe, A. Orr, D. J. Quincey, A. N. Ross, S. Rangecroft, K. Medina, H. Burns, A. Llacza, G. Jacome, R. A. Hellstrom, J. Castro, A. Cochachin, N. Montoya, E. Loarte, and F. Pellicciotti (2023), Projected increases in climate extremes and droughts in the Peruvian Andes, 1980-2100, npj Clim. Atmos. Sci., 6, 96, https://doi.org/10.1038/s41612-023-00409-z.

77) Zhang, X. D., X. Y. Chen, A. Orr, J. E. Overland, T. Vihma, M. Y. Wang, Q. H. Yang, and R. H. Zhang (2023), Preface to the special issue on Changing Arctic Climate and Low/Mid-latitudes Connections, Adv. Atmos. Sci., 40, 2135−2137, https://doi.org/10.1007/s00376-023-3015-8.

76) Lu, H., S. Colwell, J. King, A. Orr, T. Phillips, E. Dobb, J. Xue, S. Kucieba, G. Phillips, and G. Marshall, Temperature variation in the South Orkney Islands, Southern Ocean, Int. J. Climatol., 1–18, https://doi.org/10.1002/joc.8302.

2022

75) Orr, A., B. Ahmad, U. Alam, A. Appadurai, Z. P. Bharucha, H. Biemans, et al. (2022), Knowledge priorities on climate change and water in the Upper Indus Basin: A horizon scanning exercise to identify the Top 100 research questions in social and natural sciences, Earth’s Future, 10, https://doi.org/10.1029/2021EF002619.

74) Gilbert, E., A. Orr, J. King, I. Renfrew, and T. Lachlan-Cope (2022), A 20-year study of melt processes over Larsen C Ice Shelf using a high-resolution regional atmospheric model: Part 1, Model configuration and validation, J. Geophys. Res., 127, https://doi.org/10.1029/2021JD034766.

73) Gilbert, E., A. Orr, I. Renfrew, J. King, and T. Lachlan-Cope (2022), A 20-year study of melt processes over Larsen C Ice Shelf using a high-resolution regional atmospheric model: Part 2, Drivers of surface melt, J. Geophys. Res., 127, https://doi.org/10.1029/2021JD036012.

72) Carter, J., A. Leeson, A. Orr, C. Kittel, J. Melchior van Wessem (2022), Variability in Antarctic surface climatology across region climate models and reanalysis datasets, The Cryosphere, 16, 3815–3841, https://doi.org/10.5194/tc-16-3815-2022.

71) Lee, H., N. Johnston, L. Nieradzik, A. Orr, R. H. Mottram, W. J. van de Berg, and P. A. Mooney (2022), Towards effective collaborations between regional climate modelling and impacts relevant to modelling studies in Polar Regions, Bull. Amer. Meteor. Soc., 103, https://doi.org/10.1175/BAMS-D-22-0102.1.

70) Hansen, N., S. B. Simonsen, F. Boberg, C. Kittel, A. Orr, N. Souverijns, J. M. van Wessem, and R. Mottram (2022), Brief communication: Impact of common ice mask in surface mass balance estimates over the Antarctic ice sheet, The Cryosphere, 16, 711–718, https://doi.org/10.5194/tc-16-711-2022.

2021

69) Orr, A., International Panel on Climate Change (IPCC), AR6 Atlas of Regional Climate Information, Antarctic Chapter, contributing author. In Gutiérrez, J. M., R. G. Jones, G. T. Narisma, L. M. Alves, M. Amjad, I. V. Gorodetskaya, M. Grose, N. A. B. Klutse, S. Krakovska, J. Li, D. Martínez-Castro, L. O. Mearns, S. H. Mernild, T. Ngo-Duc, B. van den Hurk, and J.-H. Yoon, 2021: Atlas. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 1927–2058, doi:10.1017/9781009157896.021.

68) Orr, A., A. Kirchgaessner, J. King, T. Phillips, E. Gilbert, A. Elvidge, M. Weeks, A. Gadian, P. Kuipers Munneke, M. van den Broeke, S. Webster, and D. McGrath (2021), Comparison of kilometre and sub-kilometre scale simulations of a foehn wind event over the Larsen C Ice Shelf using the Met Office Unified Model (MetUM), Q. J. Roy. Met. Soc., 147, 3472-3492, https://doi.org/10.1002/qj.4138.

67) Orr, A., H. Lu, P. Martineau, E. P. Gerber, G. Marshall, and T. Bracegirdle (2021), Is our dynamical understanding of the circulation changes associated with the Antarctic ozone hole sensitive to the choice of reanalysis dataset?, Atmos. Chem. Phys., 21, 7451–7472, https://doi.org/10.5194/acp-21-7451-2021.

66) Fyffe, C., E. Potter, S. Fugger, A. Orr, S. Fatichi, K. Medina, R. A. Hellstrom, M. Bernat, C. Aubry-Wake, W. Gurgiser, L. B. Perry, W. Suarez, D. J. Quincey, E. Loarte, and F. Pellicciotti (2021), The energy and mass balance of Peruvian glaciers, J. Geophys. Res., 126, e2021JD034911, https://doi.org/10.1029/2021JD034911.

65) Mottram, R., N. Hansen, C. Kittel, M. van Wessem, C. Agosta, C. Amory, F. Boberg, W. J. van de Berg, X. Fettweis, A. Gossart, N. P. M. van Lipzig, E. van Meijgaard, A. Orr, T. Phillips. S. Webster, S. B. Simonsen, and N. Souverijns (2021), What is the surface mass balance of Antarctica? An intercomparison of regional climate model estimates, The Cryosphere, 15, 3751–3784, https://doi.org/10.5194/tc-15-3751-2021.

64) Tritscher, I., M. C. Pitts, L. R. Poole, S. P. Alexander, F. Cairo, M. P. Chipperfield, J.-U. Groob, M. Hopfner, A. Lambert, B. P. Luo, S. Molleker, A. Orr, R. Salawitch, M. Snels, R. Spang, W. Woiwode, and T. Peter (2021), Polar Stratospheric Clouds: Satellite Observations, Processes, and Role in Ozone Depletion, Rev. Geophys., 59, https://doi.org/10.1029/2020RG000702.

63) Gerber, E. P., P. Martineau, B. Ayarzaguena, D. Barriopedro, T. J. Bracegirdle, A. H. Butler, N. Calvo, S. C. Hardiman, P. Hitchcock, M. Iza, U. Langematz, H. Lua, G. Marshall, A. Orr, F. M. Palmeiro, S.-W. Son, and M. Taguchi (2021), Extratropical Stratosphere–troposphere Coupling, In Stratosphere-troposphere Processes and their Role in Climate (SPARC) Reanalysis Intercomparison Project (S-RIP) (Chap. 6), M. Fujiwara, G. L. Manney, L. Gray, and J. S. Wright, Eds., Oberpfaffenhofen Germany, SPARC, p. 219-262.

62) King, J. C., J. Turner, S. Colwell, H. Lu, A. Orr, T. Phillips, and S. Hosking (2021), Inhomogeneity of the surface air temperature record from Halley, Antarctica, J. Clim., 34, 4771–4783, https://doi.org/10.1175/JCLI-D-20-0748.1.

2020

61) Orr, A., S. Hosking, A. Dellon, L. Hoffmann, R. Spang, T. Moffat-Griffin, J. Keeble, L. Abraham, and P. Braesicke (2020), PSCs initiated by mountain waves in a global chemistry-climate model: A missing piece in fully modelling polar stratospheric ozone depletion, Atmos. Chem. Phys., 20, 12,483-12,497, https://doi.org/10.5194/acp-20-12483-2020.

60) Potter, E., A. Orr, I. Willis, D. Bannister, and P. Wagnon (2020), Meteorological impacts of a novel debris-covered glacier category in a regional climate model across a Himalayan catchment, Atmos. Sci. Lett., 22, https://doi.org/10.1002/asl.1018.

59) Gilbert, E., A. Orr, J. King, I. Renfrew, T. Lachlan-Cope, P. Field, and I. Boutle (2020), Summertime cloud phase strongly influences surface melting on the Larsen C ice shelf Antarctica, Q. J. Roy. Met. Soc., 146, 1575-1589, https://doi.org/10.1002/qj.3753.

58) Pope, J., A. Orr, G. J. Marshall, and N. L. Abraham (2020), Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry, Atmos. Sci. Lett., 21, https://doi.org/10.1002/asl.1004.

57) Sedlar, J., M. Tjernstrom, A. Rinke, A. Orr, J. Cassano, X. Fetweis, G. Heinemann, M. Seefeldt, A. Solomon, H. Matthes, T. Phillips, and S. Webster (2020), Confronting Arctic troposphere, clouds, and surface energy budget representations in regional climate models with observations, J. Geophys. Res., 125, https://doi.org/10.1029/2019JD031783.

56) Inoue, J., K. Sato, A. Rinke, J. J. Cassano, X. Fettweis, G. Heinemann, H. Matthes, A. Orr, T. Phillips, M. Seefeldt, A. Solomon, and S. Webster (2020), Clouds and radiation processes in regional climate models evaluated using observations over the ice-free Arctic Ocean, J. Geophys. Res.,126, https://doi.org/10.1029/2020JD033904.

55) Dell, R., N. Arnold, I. Willis, A. Banwell, A. Williamson, H. Pritchard, and A. Orr (2020), Lateral meltwater transfer across an Antarctic ice shelf’, The Cryosphere, 14, 2313–2330, https://doi.org/10.5194/tc-14-2313-2020.

2019

54) Bannister, D., A. Orr, S. K. Jain, I. P. Holman, A. Momblanch, T. Phillips, A. J. Adeloye, B. Snapir, T. W. Waine, and J. S. Hosking (2019), Bias correction of high‐resolution regional climate model precipitation output gives the best estimates of precipitation in Himalayan catchments, J. Geophys. Res., 124, 14,220–14,239, https://doi.org/10.1029/2019JD030804.

53) Gumber, S., S. Ghosh, A. Orr, S. Kumar, and J. Pope (2019), On the microphysical processing of aged combustion aerosols impacting warm rain microphysics over Asian megacities, Theor. Appl. Climatol., 139, 1479-1491, https://doi.org/10.1007/s00704-019-03042-0.

52) Prasad, V., A. V. Kulkarni, S. Pradeep, S. Pratibha, S. A. Tawde, T. Shirsat, A. R. Arya, A. Orr, and D. Bannister (2019), Large losses in glacier area and water availability by the end of the century under high greenhouse gas emission scenario, Satluj basin, Himalaya, Curr. Sci., 116, 1721-1730, https://doi.org/10.18520/cs/v116/i10/1721-1730.

2018

51) Clem, K., A. Orr, and J. Pope (2018), The Springtime Influence of Natural Tropical Pacific Variability on the Surface Climate of the Ross Ice Shelf, West Antarctica: Implications for Ice Shelf Thinning, Sci. Rep., 8, https://doi.org/10.1038/s41598-018-30496-5.

50) Deb., P., A. Orr, D. H. Bromwich, J. P. Nicholas, J. Turner, and J. S. Hosking (2018), Summer drivers of atmospheric variability affecting ice shelf thinning in the Amundsen Sea Embayment, West Antarctica, Geophys. Res. Lett., 45, 4124-4133, https://doi.org/10.1029/2018GL077092.

49) Potter, E. R., A. Orr, I. C. Willis, D. Bannister, and F. Salerno (2018), Dynamical drivers of the local wind regime in a Himalayan valley, J. Geophys. Res., https://doi.org/10.1029/2018JD029427.

48) Spang, R., L. Hoffmann, R. Muller, J.-U. Groob, I. Tritscher, M. Hopfner, M. Pitts, A. Orr, and M. Riese (2018), A climatology of polar stratospheric cloud composition between 2002 and 2012 based on MIPAS/Envisat observations, Atmos. Chem. Phys., 18, 5089-5113, https://doi.org/10.5194/acp-18-5089-2018.

47) Kuipers Munneke, P., A. J. Luckman, S. L. Bevan, C. J. P. P. Smeets, E. Gilbert, M. R. van den Broeke, W. Wang, C. Zender, B. Hubbard, D. Ashmore, A. Orr, and J. C. King (2018), Intense winter surface melt on an Antarctic ice shelf’, Geophys. Res. Lett., 45, https://doi.org/10.1029/2018GL077899.

46) Widmann, M., R. Blake, K.P. Sooraj, A. Orr, J. Sanjay, A. Karumuri, A. K Mitra, E. N. Rajagopal, A .F. Van Loon, D. M. Hannah, N. Barrand, R. Singh, V. Mishra, F. Sugden, and D. S. Arya (2018), Current Opportunities and Challenges in Developing Hydro-Climatic Services in the Himalayas: Report of India-UK Water Center Pump Priming Project 2017, Center for Ecology & Hydrology, Wallingford and Indian Institute of Tropical Meteorology, Pune.

2017

45) Orr, A., C. Listowski, M. Couttet, E. Collier, W. Immerzeel, P. Deb, and D. Bannister (2017), Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya to cloud microphysics schemes in WRF, J. Geophys. Res., 122, 6298-6318, https://doi.org/10.1002/2016JD025801.

43) Orr, A., Regional climate downscaling through the Antarctic CORDEX project, World Meteorological Organisation Antarctic Treaty Paper, 2017, https://www.ats.aq/devAS/Meetings/Documents/82.

44) Turner, J., A. Orr, H. Gudmundsson, A. Jenkins, R. G. Bingham, C.-D. Hilenbrand, and T. J. Bracegirdle (2017), Atmosphere-ocean-ice interactions in the Amundsen Sea Embayment, West Antarctica, Rev. Geophys., 55, 235-276, https://doi.org/10.1002/2016RG000532.

43) Alexander, S., A. Orr, S. Webster, and D. Murphy (2017), Observations and fine-scale model simulations of gravity waves over Davis, East Antarctica (69S, 78E), J. Geophys. Res., 122, 7355-7370, https://doi.org/10.1002/2017JD026615.

42) Hoffman, L., R. Spang, A. Orr, M. J. Alexander, L. A. Holt, and O. Stein (2017), A decadal satellite record of gravity wave activity to study polar stratospheric cloud formation, Atmos. Chem. Phys., 17, 2901-2920, https://doi.org/10.5194/acp-17-2901-2017.

41) Pope, J. O., P. R. Holland, A. Orr, G. J. Marshall, and T. Phillips (2017), The impacts of El Niño on the observed sea ice budget of West Antarctica, Geophys. Res. Lett., 44, 6200-6208, https://doi.org/10.1002/2017GL073414.

40) Zhang, X., T. Jung, M. Wang, Y. Luo, T. Semmler, and A. Orr (2017), Preface to the special issue: Towards improving understanding and prediction of Arctic change and its linkage with Eurasian mid-latitude weather and climate, Adv. Atmos. Sci., 35, 1-4, https://doi.org/10.1007/s00376-017-7004-7.

39) Moffat-Griffin, T., M. J. Taylor, T. Nakamura, A. J. Kavanagh, J. S. Hosking, and A. Orr (2017), 3rd Antarctic Gravity Wave Instrument Network (ANGWIN) science workshop, Adv. Atmos. Sci., 32, 1-3, https://doi.org/10.1007/s00376-016-6197-5.

38) King, J., A. Kirchgaessner, S. Bevan, A. D. Elvidge, P. Kuipers Munneke, A. Luckman, A. Orr, I. A. Renfrew, M. R. van den Broeke (2017), The impacts of fohn winds on surface energy balance during the 2010-2011 melt season over Larsen C Ice Shelf, Antarctica, J. Geophys. Res., 122, 12,062-12,076, https://doi.org/10.1002/2017JD026809.

37) Bramberger, M., A. Dornbrack, K. Bossert, B. Ehard, D. C. Fritts, B. Kaifler, C. Mallaun, A. Orr, P.-D. Pautet, M. Rapp, M. J. Taylor, S. Vosper, B. P. Williams, and B. Witschas (2017), Does strong tropospheric forcing cause large-amplitude mesospheric gravity waves? – A DEEPWAVE case study, J. Geophys. Res., 122, 11,422– 11,443, https://doi.org/10.1002/2017JD027371.

2016

36) Hosking, S., A. Orr, T. Bracegirdle, and J. Turner (2016), Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing, Geophys. Res. Lett., 43, 367-376, https://doi.org/10.1002/2015GL067143.

35) Deb, P., A. Orr, J. S. Hosking, T. Phillips, J. Turner, D. Bannister, J. Pope, and S. Colwell (2016), An assessment of the Polar WRF representation of near-surface meteorological variables over West Antarctica, J. Geophys. Res., 121, 1532-1548, https://doi.org/10.1002/2015JD024037.

34) Jones, R. W., I. A. Renfrew, A. Orr, B. G. M. Webber, D. M. Holland, and M. A. Lazzara (2016), Evaluation of four global reanalysis products using in situ observations in the Amundsen Sea Embayment, Antarctica, J. Geophys. Res., 121, 6240-6257, https://doi.org/10.1002/2015JD024680.

33) Elvidge, A., I. Renfrew, J. King, A. Orr, and T. A. Lachlan-Cope (2016), Foehn warming distributions in non-linear and linear flow regimes: A focus on the Antarctic Peninsula, Q. J. Roy. Met. Soc., 142, 618-631, https://doi.org/10.1002/qj.2489.

32) Spang, R., L. Hoffmann, M. Hopfner, S. Griessbach, R Muller, M. C. Pitts, A. Orr, and M. Riese (2016), A multi-wavelength classification method for polar stratospheric cloud types using infrared limb spectra, Atmos. Meas. Tech., 9, 3619-3639, https://doi.org/10.5194/amt-9-3619.

2015

31) Orr, A., J. S. Hosking, L. Hoffmann, J. Keeble, S. M. Dean, H. K. Roscoe, L. Abraham, S. Vosper, and T. Phillips (2015), Inclusion of mountain wave-induced cooling for the formation of PSCs over the Antarctic Peninsula in a chemistry-climate model, Atmos. Chem. Phys., 15, 1071-1086, https://doi.org/10.5194/acp-15-1071-2015.

30) Orr, A. and J. C. R. Hunt, Wind jets and associated variations in cloudiness along coastlines and in valleys associated with Coriolis effects, Met Office Forecast Handbook, 2015.

29) Elvidge, A., I. Renfrew, J. King, A. Orr, T. A. Lachlan-Cope, M. Weeks, and S. L. Gray (2014), Foehn jets over the Larsen C Ice Shelf, Antarctica, Q. J. Roy. Met. Soc., 141, 698-713, https://doi.org/10.1002/qj.2382.

28) King, J. C., A. Gadian, A. Kirchgaessner, P. Kuipers Munneke, T. A. Lachlan-Cope, A. Orr, C. Reijmer, M. R. van den Broeke, J. M. van Wessem, and M. Weeks (2015), Validation of the summertime surface energy budget of Larsen C Ice Shelf (Antarctica) as represented in three high-resolution atmospheric models, J. Geophys. Res., https://doi.org/10.1002/2014JD022604.

2014

27) Orr, A., T. Phillips, S. Webster, A. Elvidge, M. Weeks, S. J. Hosking, and J. Turner (2014), Met Office Unified Model high resolution simulations of a strong wind event in Antarctica, Q. J. Roy. Met. Soc., 140, 2287-2297, https://doi.org/10.1002/qj.2296.

26) Hosking, J. S., D. Bannister, A. Orr, J. King, E. Young, and T. Phillips (2014), Orographic forcing of surface winds over the shelf waters adjacent to South Georgia, Atmos. Sci. Lett., 16, 50-55, https://doi.org/10.1002/asl2.519.

25) Meredith, M., A. Orr, J. Shanklin, and J. Turner, Assessment for Decision-Makers: Scientific Assessment of Ozone Depletion, World Meteorological Organisation, 46pp, 2014.

2013

24) Orr, A., T. J. Bracegirdle, J. S. Hoskings, W. Feng, H. Roscoe, and J. D. Haigh (2013), Strong dynamical modulation of the cooling of the polar stratosphere associated with the Antarctic ozone hole, J. Climate, 26, 662-668, https://doi.org/10.1175/JCLI-D-12-00480.1.

23) Orr, A., Mesoscale modelling method development in the offshore wind accelerator program: Comparison of UM and HIRLAM models. Cambridge Environmental Research Consultants, Cambridge, UK, 2013.

22) Hosking, J. S., A. Orr, G. J. Marshall, J. Turner, and T. Phillips (2013), The influence of the Amundsen-Bellingshausen Seas Low on the climate of West Antarctica and its representation in coupled climate model simulations, J. Climate, 26, 6633-6648, https://doi.org/10.1175/JCLI-D-12-00813.1.

21) Marshall, G. J., A. Orr, and J. Turner (2013), A predominant reversal in the relationship between the SAM and East Antarctic temperatures during the 21st Century, J. Climate, 26, 5196-5204, https://doi.org/10.1175/JCLI-D-12-00671.1.

2012

20) Orr, A., T. J. Bracegirdle, J. S. Hoskings, T. Jung, J. D. Haigh, T. Phillips, and W. Feng (2012), Possible dynamical mechanisms for Southern Hemisphere climate change due to the ozone hole, J. Atmos. Sci., 69, 2917-2932, https://doi.org/10.1175/JAS-D-11-0210.1.

19) Turner, J., T. Phillips, J. S. Hosking, G. J. Marshall, and A. Orr (2012), The Amundsen Sea low, Int. J. Climatol., https://doi.org/10.1002/joc.3558.

2010

18) Orr, A., P. Bechtold, J. Scinocca, M. Ern, and M. Janiskova (2010), Improved middle atmosphere climate and forecasts in the ECMWF model through a non-orographic gravity wave drag parametrization, J. Climate, 23, 5905-5926, https://doi.org/10.1175/2010JCLI3490.1.

17) Jung, T., G. Balsamo, P. Bechtold, A. C. M. Beljaars, M. Kohler, M. J. Miller, J.-J. Morcrette, A. Orr, M. J. Rodwell, and A. M. Tomkins (2010), The ECMWF model climate: Recent progress through improved physical parametrizations, Q. J. Roy. Met. Soc., 136, 1145-1160, https://doi.org/10.1002/qj.634.

2009

16) Orr, A., and P. Bechtold (2009), Improvement in the capturing of short-range warm season orographic precipitation in the ECMWF model, Meteorol. Atmos. Phys., 103, 15-23, https://doi.org/10.1007/s00703-008-0288-5.

15) Orr, A., The representation of non-orographic gravity waves in the IFS Part II: A physically based spectral parametrization, European Centre for Medium-range Weather Forecasting (ECMWF) technical memo no. 593, ECMWF, Reading, UK, doi: 10.21957/jpko88tx6, https://www.ecmwf.int/node/11446, 2009.

14) Orr, A., and N. Wedi, The representation of non-orographic gravity waves in the IFS Part I: Assessment of the middle atmosphere climate with Rayleigh friction, ECMWF technical memo no. 592, ECMWF, Reading, UK, doi: 10.21957/45nr8vsb, https://www.ecmwf.int/node/11447, 2009.

13) Turner, J., S. N. Chenoli, A. abu Samah, G. Marshall, T. Phillips, and A. Orr (2009), Strong wind events in the Antarctic, J. Geophys. Res., 114, D18103, https://doi.org/10.1029/2008JD011642.

12) Turner, J., J. C. Comiso, G. J. Marshall, T. A. Lachlan-Cope, T. Bracegirdle, T. Maksym, M. P. Meredith, Z. Wang, and A. Orr (2009), Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent, Geophys. Res. Lett., 36, L08502, https://doi.org/10.1029/2009GL037524.

11) Turner, J., P. Anderson, T. Lachlan-Cope, S. Colwell, T. Phillips, A. Kirchgaessner, G. J. Marshall, J. C. King, T. J. Bracegirdle, D. G. Vaughan, V. Lagun, and A. Orr (2009), Record low surface air temperature at Vostock station, Antarctica’, J. Geophys. Res., 114, D24102, https://doi.org/10.1029/2009JD012104.

2008

10) Orr, A., G. J. Marshall, J. C. R. Hunt, J. Sommeria, C. Wang, N. van Lipzig, D. Cresswell, and J. C. King (2008), Characteristics of airflow over the Antarctic Peninsula and its response to recent strengthening of westerly circumpolar winds, J. Atmos. Sci., 65, 1396-1413, https://doi.org/10.1175/2007JAS2498.1.

9) Van Lipzig, N. P. M., G. J. Marshall, A. Orr, and J. C. King (2008), The relationship between the southern hemisphere annular mode and Antarctic Peninsula summer temperatures: Analysis of a high-resolution model, J. Climate, 21, 1649–1668, https://doi.org/10.1175/2007JCLI1695.1.

2007

8) Orr, A., Evaluation of revised parameterization of sub-grid orographic drag, ECMWF technical memo no. 536, ECMWF, Reading, UK, doi:10.21957/1yye3n6ik, https://www.ecmwf.int/node/11452, 2007.

2006

7) Marshall, G. J., A. Orr, N. van Lipzig, and J. C. King (2006), The impact of a changing Southern Hemisphere Annular Mode on Antarctic Peninsula summer temperatures, J. Climate, 19, 5388-5404, https://doi.org/10.1175/JCLI3844.1.

2005

6) Orr, A., J. C. R. Hunt, R. Capon, J. Sommeria, D. Cresswell, and A. Owinoh (2005), Coriolis effects on wind jets and cloudiness along coasts, Weather, 60, 291-299, https://doi.org/10.1256/wea.219.04.

5) Orr, A., E. Hanna, J. C. R. Hunt, J. Cappelen, K. Steffen, and A. Stephens (2005), Characteristics of stable flows over Southern Greenland, Pure Appl. Geophys., 162, 1747-1778, https://doi.org/10.1007/s00024-005-2691-x.

4) Owinoh, A., J. C. R. Hunt, A. Orr, P. Clark, R. Klein, H. J. S. Fernando, and F. T. N. Nieuwstadt (2005), Effects of changing surface heat flux on the atmospheric boundary layer flow over flat terrain, Bound.-Layer Meteorol., 116, 331-361, https://doi.org/10.1007/s10546-004-2819-z.

2004

3) Orr, A., D. Cresswell, G. J. Marshall, J. C. R. Hunt, J. Sommeria, and C. G. Wang (2004), A ‘low-level’ explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation, Geophys. Res. Lett., 31, L06204, https://doi.org/10.1029/2003GL019160.

2) Hunt, J. C. R., A. Orr, J. W. Rottman, and R. Capon (2004), Coriolis effects in mesoscale flows with sharp changes in surface conditions, Q. J. Roy. Met. Soc., 130, 2703-2731, https://doi.org/10.1256/qj.04.14.

2003

1) Hunt, J. C. R., A. Orr, D. Cresswell, and A. Owinoh (2003), Coriolis effects in mesoscale shallow layer flows, Proceedings of the International Symposium on Shallow Flows (Eds. G. H. Jirka and W. S. J. Uijttewaal), Delft, June 16-18, 117-124.

Publications from NERC Open Research Archive

2024

Levine, Xavier J., Williams, Ryan S. , Marshall, Gareth , Orr, Andrew , Seland Graff, Lise, Handorf, Dörthe, Karpechko, Alexey, Köhler, Raphael, Wijngaard, René R., Johnston, Nadine , Lee, Hanna, Nieradzik, Lars, Mooney, Priscilla A.. (2024) Storylines of summer Arctic climate change constrained by Barents–Kara seas and Arctic tropospheric warming for climate risk assessment. Earth System Dynamics, 15. 1161-1177. 10.5194/esd-15-1161-2024

Hansen, Nicolaj, Orr, Andrew , Zou, Xun, Boberg, Fredrik, Bracegirdle, Thomas J. , Gilbert, Ella , Langen, Peter L., Lazzara, Matthew A., Mottram, Ruth, Phillips, Tony , Price, Ruth , Simonsen, Sebastian B., Webster, Stuart. (2024) The importance of cloud properties when assessing surface melting in an offline-coupled firn model over Ross Ice shelf, West Antarctica. The Cryosphere, 18. 20 pp. 10.5194/tc-18-2897-2024

Angus, Michael, Widmann, Martin, Orr, Andrew , Ashrit, Raghavendra, Leckebusch, Gregor C., Mitra, Ashis. (2024) A comparison of two statistical postprocessing methods for heavy‐precipitation forecasts over India during the summer monsoon. Quarterly Journal of the Royal Meteorological Society, 150. 19 pp. 10.1002/qj.4677

Williams, Ryan S. , Marshall, Gareth J. , Levine, Xavier, Graff, Lise S., Handorf, Dörthe, Johnston, Nadine M. , Karpechko, Alexey Y., Orr, Andrew , Van de Berg, Willem J., Wijngaard, René R., Mooney, Priscilla A.. (2024) Future Antarctic Climate: Storylines of mid-latitude jet strengthening and shift emergent from CMIP6. Journal of Climate, 37. 2157-2178. 10.1175/JCLI-D-23-0122.1

2023

Lu, Hua , Colwell, Steve, King, John , Orr, Andrew , Phillips, Tony , Dobb, Emilia, Xue, Jonathan, Kucieba, Sabina, Phillips, Guy, Marshall, Gareth . (2023) Temperature variation in the South Orkney Islands, maritime Antarctic. International Journal of Climatology, 43. 18 pp. 10.1002/joc.8302

Zhang, X., Chen, X., Orr, A. , Overland, J.E., Vihma, T., Wang, M., Yang, Q., Zhang, R.. (2023) Preface to the Special Issue on Changing Arctic Climate and Low/Mid-latitudes Connections [editorial]. Advances in Atmospheric Sciences, 40. 3 pp. 10.1007/s00376-023-3015-8

Lu, Hua , Orr, Andrew , King, John C. , Phillips, Tony , Gilbert, Ella , Colwell, Steve R., Bracegirdle, Thomas J. . (2023) Extreme warm events in the South Orkney Islands, Southern Ocean: Compounding influence of atmospheric rivers and föhn conditions. Quarterly Journal of the Royal Meteorological Society, 149. 24 pp. 10.1002/qj.4578

Potter, Emily R. , Fyffe, Catriona L., Orr, Andrew , Quincey, Duncan J., Ross, Andrew N., Rangecroft, Sally, Medina, Katy, Burns, Helen, Llacza, Alan, Jacome, Gerardo, Hellström, Robert Å., Castro, Joshua, Cochachin, Alejo, Montoya, Nilton, Loarte, Edwin, Pellicciotti, Francesca. (2023) A future of extreme precipitation and droughts in the Peruvian Andes. npj Climate and Atmospheric Science, 6. 9 pp. 10.1038/s41612-023-00409-z

Orr, Andrew , Deb, Pranab, Clem, Kyle R., Gilbert, Ella , Bromwich, David H., Boberg, Fredrik, Colwell, Steve, Hansen, Nicolaj, Lazzara, Matthew A., Mooney, Priscilla A., Mottram, Ruth, Niwano, Masashi, Phillips, Tony , Pishniak, Denys, Reijmer, Carleen H., van de Berg, Willem Jan, Webster, Stuart, Zou, Xun. (2023) Characteristics of surface “melt potential” over Antarctic ice shelves based on regional atmospheric model simulations of summer air temperature extremes from 1979/80 to 2018/19. Journal of Climate, 36. 27 pp. 10.1175/JCLI-D-22-0386.1

2022

Carter, J., Leeson, A., Orr, A. , Kittel, C., Melchior van Wessem, J.. (2022) Variability in Antarctic surface climatology across regional climate models and reanalysis datasets. The Cryosphere, 16. 27 pp. 10.5194/tc-16-3815-2022

Lee, Hanna, Johnston, Nadine , Nieradzik, Lars, Orr, Andrew , Mottram, Ruth H., van de Berg, Willem Jan, Mooney, Priscilla A.. (2022) Toward Effective Collaborations between Regional Climate Modeling and Impacts-Relevant Modeling Studies in Polar Regions. Bulletin of the American Meteorological Society, 103. E1866-E1874. 10.1175/BAMS-D-22-0102.1

Gilbert, E. , Orr, A. , Renfrew, I.A., King, J.C. , Lachlan-Cope, T. . (2022) A 20‐year study of melt processes over Larsen C Ice Shelf using a high‐resolution regional atmospheric model: Part 2, Drivers of surface melting. Journal of Geophysical Research: Atmospheres, 127. 19 pp. 10.1029/2021JD036012

Gilbert, E. , Orr, A. , King, J.C. , Renfrew, I., Lachlan-Cope, T.A. . (2022) A 20-year study of melt processes over Larsen C Ice Shelf using a high-resolution regional atmospheric model: Part 1, Model configuration and validation. Journal of Geophysical Research: Atmospheres, 127. 17 pp. 10.1029/2021JD034766

Orr, Andrew , Ahmad, Bashir, Alam, Undala, Appadurai, ArivudaiNambi, Bharucha, Zareen P., Biemans, Hester, Bolch, Tobias, Chaulagain, Narayan P., Dhaubanjar, Sanita, Dimri, A.P., Dixon, Harry , Fowler, Hayley J., Gioli, Giovanna, Halvorson, Sarah J., Hussain, Abid, Jeelani, Ghulam, Kamal, Simi, Khalid, Imran S., Liu, Shiyin, Lutz, Arthur, Mehra, Meeta K., Miles, Evan, Momblanch, Andrea, Muccione, Veruska, Mukherji, Aditi, Mustafa, Daanish, Najmuddin, Omaid, Nasimi, Mohammad N., Nüsser, Marcus, Pandey, Vishnu P., Parveen, Sitara, Pellicciotti, Francesca, Pollino, Carmel, Potter, Emily, Qazizada, Mohammad R., Ray, Saon, Romshoo, Shakil, Sarkar, Syamal K., Sawas, Amiera, Sen, Sumit, Shah, Attaullah, Shah, M. Azeem Ali, Shea, Joseph M., Sheikh, Ali T., Shrestha, Arun B., Tayal, Shresth, Tigala, Snehlata, Virk, Zeeshan T., Wester, Philippus, Wescoat, James L.. (2022) Knowledge priorities on climate change and water in the Upper Indus Basin: a horizon scanning exercise to identify the top 100 research questions in social and natural sciences. Earth's Future, 10. 22 pp. 10.1029/2021EF002619

Hansen, Nicolaj, Simonsen, Sebastian B., Boberg, Fredrik, Kittel, Christoph, Orr, Andrew , Souverijns, Niels, van Wessem, J. Melchior, Mottram, Ruth. (2022) Brief communication: Impact of common ice mask in surface mass balance estimates over the Antarctic ice sheet. The Cryosphere, 16. 711-718. 10.5194/tc-16-711-2022

2021

Fyffe, Catriona L., Potter, Emily, Fugger, Stefan, Orr, Andrew , Fatichi, Simone, Loarte, Edwin, Medina, Katy, Hellström, Robert Å., Bernat, Maud, Aubry‐Wake, Caroline, Gurgiser, Wolfgang, Perry, L. Baker, Suarez, Wilson, Quincey, Duncan J., Pellicciotti, Francesca. (2021) The energy and mass balance of Peruvian glaciers. Journal of Geophysical Research: Atmospheres, 126. 22 pp. 10.1029/2021JD034911

Orr, Andrew , Kirchgaessner, Amélie , King, John , Phillips, Tony , Gilbert, Ella, Elvidge, Andrew, Weeks, Mark, Gadian, Alan, Kuipers Munneke, Peter, van den Broeke, Michiel, Webster, Stuart, McGrath, Daniel. (2021) Comparison of kilometre and sub‐kilometre scale simulations of a foehn wind event over the Larsen C Ice Shelf, Antarctic Peninsula using the Met Office Unified Model (MetUM). Quarterly Journal of the Royal Meteorological Society, 147. 3472-3492. 10.1002/qj.4138

Mottram, R., Hansen, N., Kittel, C., Melchior van Wessem, J., Agosta, C., Amory, C., Boberg, F., Jan van de Berg, W., Fettweis, X., Gossart, A., van Lipzig, N.P.M., van Meijgaard, E., Orr, A. , Phillips, T. , Webster, S., Simonsen, S.B., Souverijns, N.. (2021) What is the surface mass balance of Antarctica? An intercomparison of regional climate model estimates.. The Cryosphere, 15. 34 pp. 10.5194/tc-15-3751-2021

Tritscher, I., Pitts, M. C., Poole, L. R., Alexander, S. P., Cairo, F., Chipperfield, M. P., Grooß, J.‐U., Höpfner, M., Lambert, A., Luo, B. P., Molleker, S., Orr, A. , Salawitch, R., Snels, M., Spang, R., Woiwode, W., Peter, T.. (2021) Polar stratospheric clouds satellite observations, processes, and role in ozone depletion. Reviews of Geophysics, 59. 82 pp. 10.1029/2020RG000702

King, John C. , Turner, John , Colwell, Steve, Lu, Hua , Orr, Andrew , Phillips, Tony , Hosking, J. Scott , Marshall, Gareth J. . (2021) Inhomogeneity of the surface air temperature record from Halley, Antarctica. Journal of Climate, 34. 13 pp. 10.1175/JCLI-D-20-0748.1

Orr, Andrew , Lu, Hua , Martineau, Patrick, Gerber, Edwin P., Marshall, Gareth J. , Bracegirdle, Thomas J. . (2021) Is our dynamical understanding of the circulation changes associated with the Antarctic ozone hole sensitive to the choice of reanalysis dataset?. Atmospheric Chemistry and Physics, 21. 22 pp. 10.5194/acp-21-7451-2021

Potter, Emily R. , Orr, Andrew , Willis, Ian C., Bannister, Daniel , Wagnon, Patrick. (2021) Meteorological impacts of a novel debris-covered glacier category in a regional climate model across a Himalayan catchment. Atmospheric Science Letters, 22. 12 pp. 10.1002/asl.1018

Inoue, Jun, Sato, Kazutoshi, Rinke, Annette, Cassano, John J., Fettweis, Xavier, Heinemann, Günther, Matthes, Heidrun, Orr, Andrew , Phillips, Tony , Seefeldt, Mark, Solomon, Amy, Webster, Stuart. (2021) Clouds and radiation processes in regional climate models evaluated using observations over the ice‐free Arctic Ocean. Journal of Geophysical Research: Atmospheres, 126. 25 pp. 10.1029/2020JD033904

2020

Pope, James , Orr, Andrew , Marshall, Gareth , Abraham, Nathan Luke. (2020) Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry. Atmospheric Science Letters, 21. 10.1002/asl.1004

Orr, Andrew , Hosking, J. Scott , Delon, Aymeric, Hoffman, Lars, Spang, Reinhold, Moffat-Griffin, Tracy , Keeble, James, Abraham, Nathan Luke, Braesicke, Peter. (2020) Polar stratospheric clouds initiated by mountain waves in a global chemistry-climate model: A missing piece in fully modelling polar stratospheric ozone depletion. Atmospheric Chemistry and Physics, 20. 15 pp. 10.5194/acp-20-12483-2020

Dell, Rebecca, Arnold, Neil, Willis, Ian, Banwell, Alison, Williamson, Andrew, Pritchard, Hamish , Orr, Andrew . (2020) Lateral meltwater transfer across an Antarctic ice shelf.. The Cryosphere, 14. 18 pp. 10.5194/tc-14-2313-2020

Gilbert, Ella , Orr, Andrew , King, John C. , Renfrew, I.A., Lachlan-Cope, Thomas , Field, P.F., Boutle, I.A.. (2020) Summertime cloud phase strongly influences surface melting on the Larsen C ice shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 146. 1575-1589. 10.1002/qj.3753

Gumber, Siddarth, Ghosh, Sat, Orr, Andrew , Kumar C.R., Sathish, Pope, James . (2020) On the microphysical processing of aged combustion aerosols impacting warm rain microphysics over Asian megacities. Theoretical and Applied Climatology, 139. 1479-1491. 10.1007/s00704-019-03042-0

2019

Bannister, Daniel, Orr, Andrew , Jain, Sanjay K., Holman, Ian P., Momblanch, Andrea, Phillips, Tony , Adeloye, Adebayo J., Snapir, Boris, Waine, Toby W., Hosking, Scott , Allen-Sader, Clare. (2019) Bias correction of high-resolution regional climate model precipitation output gives the best estimates of precipitation in Himalayan catchments. Journal of Geophysical Research: Atmospheres, 124. 14220-14239. 10.1029/2019JD030804

Prasad, Veena, Kulkarni, Anil V., Pradeep, S., Pratibha, S., Tawde, Sayli A., Shirsat, Tejal, Arya, A.R., Orr, Andrew , Bannister, Daniel . (2019) Large losses in glacier area and water availability by the end of the twenty-first century under high emission scenario, Satluj basin, Himalaya. Current Science, 116. 1721-1730. 10.18520/cs/v116/i10/1721-1730

2018

Potter, Emily R. , Orr, Andrew , Willis, Ian C., Bannister, Daniel , Salerno, Franco. (2018) Dynamical drivers of the local wind regime in a Himalayan valley. Journal of Geophysical Research: Atmospheres, 123. 13186-13202. 10.1029/2018JD029427

Clem, Kyle R., Orr, Andrew , Pope, James O. . (2018) The springtime influence of natural tropical Pacific variability on the surface climate of the Ross Ice Shelf, West Antarctica: implications for ice shelf thinning. Scientific Reports, 8. 10.1038/s41598-018-30496-5

Kuipers Munneke, P., Luckman, A.J., Bevan, S.L., Smeets, C.J.P.P., Gilbert, Ella , van den Broeke, M.R., Wang, W., Zender, C., Hubbard, B., Ashmore, D., Orr, Andrew , King, John C. , Kulessa, B.. (2018) Intense winter surface melt on an Antarctic ice shelf. Geophysical Research Letters, 45. 7615-7623. 10.1029/2018GL077899

Deb, Pranab, Orr, Andrew , Bromwich, David H., Nicolas, Julien P., Turner, John , Hosking, J. Scott . (2018) Summer drivers of atmospheric variability affecting ice shelf thinning in the Amundsen Sea Embayment, West Antarctica. Geophysical Research Letters, 45. 4124-4133. 10.1029/2018GL077092

Spang, Reinhold, Hoffmann, Lars, Müller, Rolf, Grooß, Jens-Uwe, Tritscher, Ines, Höpfner, Michael, Pitts, Michael, Orr, Andrew , Riese, Martin. (2018) A climatology of polar stratospheric cloud composition between 2002 and 2012 based on MIPAS/Envisat observations. Atmospheric Chemistry and Physics, 18. 5089-5113. 10.5194/acp-18-5089-2018

Zhang, Xiangdong, Jung, Thomas, Wang, Muyin, Luo, Yong, Semmler, Tido, Orr, Andrew . (2018) Preface to the special issue: Towards improving understanding and prediction of Arctic change and its linkage with Eurasian mid-latitude weather and climate. Advances in Atmospheric Sciences, 35. 1-4. 10.1007/s00376-017-7004-7

2017

Bramberger, Martina, Dörnbrack, Andreas, Bossert, Katrina, Ehard, Benedikt, Fritts, David C., Kaifler, Bernd, Mallaun, Christian, Orr, Andrew , Pautet, P.-Dominique, Rapp, Markus, Taylor, Michael J., Vosper, Simon, Williams, Bifford P., Witschas, Benjamin. (2017) Does Strong Tropospheric Forcing Cause Large-Amplitude Mesospheric Gravity Waves? A DEEPWAVE Case Study. Journal of Geophysical Research: Atmospheres, 122. 11,422-11,443. 10.1002/2017JD027371

King, J.C. , Kirchgaessner, A. , Bevan, S., Elvidge, A.D., Kuipers Munneke, P., Luckman, A., Orr, A. , Renfrew, I.A., van den Broeke, M.R.. (2017) The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica. Journal of Geophysical Research: Atmospheres, 122. 12062-12076. 10.1002/2017JD026809

Alexander, S.P., Orr, A. , Webster, S., Murphy, D. J.. (2017) Observations and fine-scale model simulations of gravity waves over Davis, East Antarctica (69°S, 78°E). Journal of Geophysical Research: Atmospheres, 122. 7355-7370. 10.1002/2017JD026615

Pope, James O. , Holland, Paul R. , Orr, Andrew , Marshall, Gareth J. , Phillips, Tony . (2017) The impacts of El Niño on the observed sea ice budget of West Antarctica. Geophysical Research Letters, 44. 6200-6208. 10.1002/2017GL073414

Orr, A. , Listowski, C., Couttet, M., Collier, E., Immerzeel, W., Deb, P., Bannister, D. . (2017) Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya to cloud microphysics schemes in WRF. Journal of Geophysical Research: Atmospheres, 122. 6298-6318. 10.1002/2016JD025801

Turner, John , Orr, Andrew , Gudmundsson, G. Hilmar , Jenkins, Adrian , Bingham, Robert G., Hillenbrand, Claus-Dieter , Bracegirdle, Thomas J. . (2017) Atmosphere-ocean-ice interactions in the Amundsen Sea Embayment, West Antarctica. Reviews of Geophysics, 55. 235-276. doi:10.1002/2016RG000532

Hoffmann, Lars, Spang, Reinhold, Orr, Andrew , Alexander, M. Joan, Holt, Laura A., Stein, Olaf. (2017) A decadal satellite record of gravity wave activity in the lower stratosphere to study polar stratospheric cloud formation. Atmospheric Chemistry and Physics, 17. 2901-2920. doi:10.5194/acp-17-2901-2017

Moffat-Griffin, Tracy , Taylor, Mike J., Nakamura, Takuji, Kavanagh, Andrew J. , Hosking, J. Scott , Orr, Andrew . (2017) 3rd ANtarctic Gravity Wave Instrument Network (ANGWIN) science workshop. Advances in Atmospheric Sciences, 34. 1-3. doi:10.1007/s00376-016-6197-5

2016

Spang, Reinhold, Hoffmann, Lars, Höpfner, Michael, Griessbach, Sabine, Müller, Rolf, Pitts, Michael C., Orr, Andrew M.W. , Riese, Martin. (2016) A multi-wavelength classification method for polar stratospheric cloud types using infrared limb spectra. Atmospheric Measurement Techniques, 9. 3619-3639. doi:10.5194/amt-9-3619-2016

Jones, R. W., Renfrew, I. A., Orr, A. , Webber, B. G. M., Holland, D. M., Lazzara, M. A.. (2016) Evaluation of four global reanalysis products using in-situ observations in the Amundsen Sea Embayment, Antarctica. Journal of Geophysical Research: Atmospheres, 121. 6240-6257. doi:10.1002/2015JD024680

Deb, Pranab, Orr, Andrew , Hosking, J. Scott , Phillips, Tony , Turner, John , Bannister, Daniel, Pope, James O. , Colwell, Steve. (2016) An assessment of the Polar Weather Research and Forecast (WRF) model representation of near-surface meteorological variables over West Antarctica. Journal of Geophysical Research - Atmospheres, 121. 1532-1548. 10.1002/2015JD024037

Hosking, J. Scott , Orr, Andrew , Bracegirdle, Thomas J. , Turner, John . (2016) Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing. Geophysical Research Letters, 43. 367-376. 10.1002/2015GL067143

Elvidge, Andrew D., Renfrew, Ian A., King, John C. , Orr, Andrew , Lachlan-Cope, Tom A. . (2016) Foehn warming distributions in non-linear and linear flow regimes: A focus on the Antarctic Peninsula. Quarterly Journal of the Royal Meteorological Society, 142. 618-631. doi:10.1002/qj.2489

2015

Elvidge, Andrew D., Renfrew, Ian A., King, John C. , Orr, Andrew , Lachlan-Cope, Tom A. , Weeks, Mark, Gray, Sue L.. (2015) Foehn jets over the Larsen C Ice Shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 141. 698-713. 10.1002/qj.2382

King, J.C. , Gadian, A., Kirchgaessner, A. , Kuipers Munneke, P., Lachlan-Cope, T.A. , Orr, A. , Reijmer, C., van den Broeke, M.R., van Wessem, J.M., Weeks, M.. (2015) Validation of the summertime surface energy budget of Larsen C Ice Shelf (Antarctica) as represented in three high-resolution atmospheric models. Journal of Geophysical Research: Atmospheres, 120. 1335-1347. 10.1002/2014JD022604

Orr, A. , Hosking, J.S. , Hoffmann, L., Keeble, J., Dean, S.M., Roscoe, H.K., Abraham, N.L., Vosper, S., Braesicke, P.. (2015) Inclusion of mountain wave-induced cooling for the formation of PSCs over the Antarctic Peninsula in a chemistry-climate model. Atmospheric Chemistry and Physics, 15. 1071-1086. 10.5194/acp-15-1071-2015

Hosking, J. Scott , Bannister, Daniel, Orr, Andrew , King, John , Young, Emma , Phillips, Tony . (2015) Orographic disturbances of surface winds over the shelf waters adjacent to South Georgia. Atmospheric Science Letters, 16. 50-55. doi:10.1002/asl2.519

2014

Orr, Andrew , Phillips, Tony , Webster, Stuart, Elvidge, Andy, Weeks, Mark, Hosking, Scott , Turner, John . (2014) Met Office unified model high resolution simulations of a strong wind event in Antarctica. Quarterly Journal of the Royal Meteorological Society, 140. 2287-2297. 10.1002/qj.2296

Meredith, Michael , Orr, Andrew , Shanklin, Jonathan, Turner, John , [and 126 others], . Ennis, Christine A. (eds.). (2014) Assessment for Decision-Makers: Scientific Assessment of Ozone Depletion: 2014. Geneva, Switzerland, World Meteorological Organization, 46 pp. (Global Ozone Research and Monitoring Project Report No. 56.)

2013

Hosking, J. Scott , Orr, Andrew , Marshall, Gareth J. , Turner, John , Phillips, Tony . (2013) The influence of the Amundsen–Bellingshausen Seas low on the climate of West Antarctica and its representation in coupled climate model simulations. Journal of Climate, 26. 6633-6648. doi:10.1175/JCLI-D-12-00813.1

Marshall, Gareth J. , Orr, Andrew , Turner, John . (2013) A predominant reversal in the relationship between the SAM and East Antarctic temperatures during the Twenty-First Century. Journal of Climate, 26. 5196-5204. 10.1175/JCLI-D-12-00671.1

Turner, John , Phillips, Tony , Hosking, J. Scott , Marshall, Gareth J. , Orr, Andrew . (2013) The Amundsen Sea low. International Journal of Climatology, 33. 1818-1829. doi:10.1002/joc.3558

Orr, Andrew , Bracegirdle, Thomas J. , Hosking, J. Scott , Feng, Wuhu, Roscoe, Howard K., Haigh, Joanna D.. (2013) Strong dynamical modulation of the cooling of the polar stratosphere associated with the Antarctic ozone hole. Journal of Climate, 26. 662-668. doi:10.1175/JCLI-D-12-00480.1

2012

Orr, Andrew , Bracegirdle, Thomas J. , Hosking, J. Scott , Jung, Thomas, Haigh, Joanna D., Phillips, Tony , Feng, Wuhu. (2012) Possible dynamical mechanisms for Southern Hemisphere climate change due to the ozone hole. Journal of the Atmospheric Sciences, 69. 2917-2932. 10.1175/JAS-D-11-0210.1

2010

Jung, T., Balsamo, G., Bechtold, P., Beljaars, A.C.M., Köhler, M., Miller, M.J., Morcrette, J.-J., Orr, A. , Rodwell, M.J., Tompkins, A.M.. (2010) The ECMWF model climate: Recent progress through improved physical parametrizations. Quarterly Journal of the Royal Meteorological Society, 136. 1145-1160. 10.1002/qj.634

2009

Turner, John , Anderson, Philip, Lachlan-Cope, Thomas , Colwell, Steve, Phillips, Tony , Kirchgaessner, Amélie , Marshall, Gareth J. , King, John C. , Bracegirdle, Tom , Vaughan, David G. , Lagun, Victor, Orr, Andrew . (2009) Record low surface air temperature at Vostok Station, Antarctica. Journal of Geophysical Research, 114. 14 pp. 10.1029/2009JD012104

Turner, John , Comiso, Josefino C., Marshall, Gareth J. , Lachlan-Cope, Tom A. , Bracegirdle, Tom , Maksym, Ted, Meredith, Michael P. , Wang, Zhaomin , Orr, Andrew . (2009) Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent. Geophysical Research Letters, 36. 5 pp. 10.1029/2009GL037524

Turner, John , Chenoli, Sheeba Nettukandy, abu Samah, Azizan, Marshall, Gareth , Phillips, Tony , Orr, Andrew . (2009) Strong wind events in the Antarctic. Journal of Geophysical Research, 114. 25 pp. 10.1029/2008JD011642

2008

Orr, Andrew , Marshall, Gareth J. , Hunt, Julian C.R., Sommeria, Joel, Wang, Chang-Gui, Van Lipzig, Nicole P.M., Cresswell, Doug, King, John C. . (2008) Characteristics of summer airflow over the Antarctic Peninsula in response to recent strengthening of westerly circumpolar winds. Journal of the Atmospheric Sciences, 65. 1396-1413. 10.1175/2007JAS2498.1

Van Lipzig, Nicole P.M., Marshall, Gareth J. , Orr, Andrew , King, John C. . (2008) The relationship between the Southern Hemisphere Annular Mode and Antarctic Peninsula summer temperatures: analysis of a high-resolution model climatology. Journal of Climate, 21. 1649-1668. 10.1175/2007JCLI1695.1

2004

Orr, A. , Cresswell, D., Marshall, G.J. , Hunt, J.C.R., Sommeria, J., Wang, C.G., Light, M.. (2004) A ‘low-level’ explanation for the recent large warming event trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation. Geophysical Research Letters, 31. 4 pp. 10.1029/2003GL019160

2024-2028 Principal-Investigator, TEAMx-FLOW: Flow dynamics, scale interactions and mountain waves for TEAMx-UK, NERC TEAMxUK: Quantifying atmospheric processes in mountainous regions, £300K funded to BAS.
2024-2028 Co-Investigator, TEAMx orographic convection, NERC TEAMxUK: Quantifying atmospheric processes in mountainous regions, £20K funded to BAS.
2024-2027 Co-Investigator, Evolution of the Larsen C firn layer: a multi-decadal record of ice shelf vulnerbaility to atmospheric warming, NPP Antarctic Science in collaboration with the BAS.
2024-2027 Co-Investigator, HEavy Precipitation forecast Post-processing over India with Machine Learning (HEPPI-ML), Weather and Climate Science for Service Partnership (WCSSP) programme. £30K funded to BAS.
2024-2028 Co-Investigator, Drivers and impacts in extreme weather events in the Antarctic (ExtAnt), NERC Directed (impacts of extreme weather events in Antarctica), £1M funded to BAS.
2024-2028 Co-Investigator, Processes, Impacts, and Changes of ANTarctic Extreme weather (PICANTE), NERC Directed (impacts of extreme weather events in Antarctica), £431K funded to BAS.
2022-2026 Co-Investigator, The Big Thaw: gauging the past, present, and future of our mountain water resources, NERC Directed (understanding and predicting changes in mountain water resources), £1.1M funded to BAS.
2022-2025 Co-Investigator, Improved characterization of PSC processes derived from a third-generation CALIOP and MLD detection and composition classification algorithm, NASA Research Opportunities in Space and Earth Sciences.
2022-2026 Co-Investigator, SURface FluxEs In AnTarctica (SURFEIT), National Capability International programme, £2.3M funded.
2022-2027 Co-Investigator, TerraFIRMA, NERC LTSM (Long-term science multi-center) funded programme, £1.4M funded to BAS.
2022-2024 Co-Investigator, Global applications of polar science expertise, National Capability International programme.
2021-2025 BAS Principal-Investigator / Work Package leader, Polar Regions in the Earth System (PolarRES), EU Horizon 2020, £815k funded to BAS.
2019-2022 Co-Investigator, Peruvian Glacier Retreat and its impact on Water Resources (Peru-GROWS), NERC/CONCYTEC, £150k funded to BAS.
2019-2021 Co-Investigator, HEavy Precipitation forecast Post-processing over India (HEPPI), Weather and Climate Science for Service Partnership (WCSSP) programme, £20k funded to BAS.
2017-2020 Co-Investigator, Polar expertise – Supporting development, NERC National Capability Overseas Development Assistance, £1.1M funded.
2017-2018 Principal-Investigator, Measuring cloud properties from meteorological radiosondes in India, NERC International Development Innovation and Impact Award, £21k funded.
2016-present Lead coordinator, Antarctic CORDEX (Coordinated Regional Downscaling Experiment), World Meteorological Organisation (WMO)-World Climate Research Programme (WCRP) funded.
2016-2018 Co-Investigator, Sustaining Himalayan Water Resources in a Changing Climate (SusHi-Wat), NERC Newton Sustaining Water Resources, £200k funded.
2014-2017 Co-Investigator, Poles apart: why has Antarctic sea-ice increased, and why can’t coupled climate models reproduce observations?, NERC standard, £500k funded.
2014-2017 Co-Investigator, Improved prediction of 21st century West Antarctic climate change: the role of the Amundsen Sea Low, NERC standard, £600k funded.
2010-2014 Principal-Investigator, Modelling the effects of realistic polar stratospheric clouds on past climate and future ozone, NERC standard, £500k funded.
2010-2014 Co-Investigator, The role of atmosphere-ocean-ice interactions in ice loss from Pine Island and Thwaites Glaciers, West Antarctica, NERC standard, £600k funded.
2009-2012 Co-Investigator, Orographic flows and the climate of the Antarctic Peninsula (OFCAP), NERC Antarctic Finance Initiative, £500k funded.
2003 Principal-Investigator, Coriolis effects in stably stratified flows with sharp changes in surface conditions, EC Integrated infrastructure initiative award to use the Coriolis turntable, Grenoble, France, £50k funded.

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