Showing 11500 items
1 January, 1988
The dynamics of the upper thermosphere in the southern polar cap, auroral, and mid‐latitude zones is reviewed. Information has been drawn from published measurements from the DE 2 and AE‐C…Read more on Southern hemisphere thermospheric dynamics: A review
1 January, 1988
The terrestrial environment of Signy Island, South Orkney Islands, maritime Antarctic, is undergoing rapid and possibly irreversible change caused by a natural biological agent. During the past decade there has…1 January, 1988
Fabry-Perot interferometer Doppler measurements of the 6300 Å oxygen emission line have been used to determine the neutral thermospheric wind over Halley, Antarctica. Simultaneous measurements of the local magnetic field…1 January, 1988
Five post-tectonic granitic plutons isolated within the central Ellsworth-Whitmore mountains crustal block in West Antarctica form a distinctive geochemical suite. All have some characteristics of S-type granites and are atypical…1 January, 1988
The Antarctic Peninsula Mesozoic magmatic arc has had a long history of dextral, strike-slip deformation. The deformation was initially associated with the development of a wide accretionary complex, by the…Read more on Role of strike-slip faulting in the tectonic evolution of the Antarctic Peninsula
1 January, 1988
A collation of available data shows that sea-water with a temperature 3°C above the in-situ freezing point lies beneath George VI Ice Shelf in the Antarctic Peninsula, and is widespread…Read more on Oceanic environment of George VI Ice Shelf, Antarctic Peninsula
1 January, 1988 by Eric Wolff, Robert Mulvaney
Analysis of an ice sample with an estimated age of 125 years, from the Antarctic Peninsula, using a scanning electron microscope with a cold stage and an X-ray micro-analysis facility,…1 January, 1988 by Eric Wolff
Clean sampling and analysis procedures have been used to measure the concentrations of Al and four heavy metals in snow representing one year’s accumulation (1983-84) near Dye 3 in Greenland.…1 January, 1988
A large (100 km N/S), stable, smoothly‐structured and significant depletion (15% in number density) of the daytime Tromsø F‐region was produced inadvertently during a Heater polarisation and beam‐forming procedure. We…Read more on A large-scale ionospheric depletion by intense radio wave heating
1 December, 1987 by Andrew Clarke, Lloyd Peck
Oxygen consumption and ammonia excretion were measured in Liothyrella uva (Broderip, 1833) held in the laboratory under simulated summer conditions. The mean oxygen consumption of a 50 mg AFDW brachiopod…1 December, 1987
We explore the conditions for resonance between cometary pick-up ions and parallel propagating electromagnetic waves. A model ring—beam distribution for the pick-up H2O+ ions is adopted which allows a direct…Read more on Resonant interactions between cometary ions and low frequency electromagnetic waves
1 October, 1987
Diurnal variations in the vertical distribution and swarming behaviour of Euphausia crystallorophias at Deception Island (61 degrees South, 66 degrees West) are described. Swarms were present at all times of…Read more on Some aspects of the small scale distribution of Euphausia crystallorophias
1 August, 1987
In most species daily and seasonal changes in the light-dark cycle are the most important synchronisers (zeitgebers) of daily and seasonal rhythms. In humans only bright light (2500 lux) appears…Read more on Bright light phase shifts the human melatonin rhythm during the Antarctic winter
1 August, 1987
A patch of high phytoplankton biomass, approximately 109 m2 in area, remained apparently stationary off King George Island, South Shetland Islands, over a period of at least 11 days. The…1 August, 1987
The two sibling species of giant petrels Macronectes halli and M. giganteus are the dominant avian scavengers in the Southern Ocean ecosystem. They breed sympatrically at a number of sub-Antarctic…Read more on Species and sexual isolating mechanisms in sibling species of giant petrels Macronectes
1 July, 1987
Observations by the Dynamics Explorer 1 satellite provide validation of the theory that terrestrial myriametric radiation is produced by the linear conversion of electrostatic upper hybrid waves to electromagnetic radiation…Read more on Observed beaming of terrestrial myriametric radiation
1 June, 1987
Narrow-band jovian kilometric radiation (nKOM) is distinguishable from broad-band jovian kilometric radiation (bKOM), both discovered by the Voyager spacecraft1–3, by its generally lower intensity, its more restricted range of centre…Read more on Io plasma torus and the source of jovian narrow-band kilometric radiation
1 June, 1987
The numerous Miocene-Recent alkaline volcanic outcrops in the Antarctic Peninsula form a substantial volcanic province, the least well-known part of a major belt of alkaline volcanism that extends between South…1 April, 1987
The global solar radiation received at the earth's surface in the presence of cloud depends not only on the optical depth of the cloud and its other physical properties, but…Read more on Solar radiation transmitted to the ground through cloud in relation to surface albedo
1 April, 1987 by Richard Horne
Two types of generating mechanisms have been proposed to explain the observations of weak electrostatic waves near the local upper hybrid frequency fuh. In this paper data from the wave…1 April, 1987 by John King
Observations of internal gravity waves in the stably-stratified atmospheric boundary layer at Halley, Antarctica are presented. These were made on 1 February, 1986 and take the form of temperature measurements…Read more on Observations of an internal gravity wave in the lower troposphere at Halley, Antarctica
1 March, 1987
A magnetospheric substorm that occurred at Sanae, Antarctica, on July 27, 1979, was observed by a variety of techniques. A synthesis of the observations is presented, and an attempt made…Read more on A magnetospheric substorm observed at Sanae, Antarctica
1 March, 1987
As part of a study on freeze‐thaw weathering in the maritime Antarctic an investigation was made of the physical properties of the local rock. Tests were made of point‐load compressive…1 March, 1987
The distribution and fine structure of muscle-fibre types has been determined for the pelagic fingerling and demersal adult stages of the antarctic teleost Notothenia neglecta Nybelin, collected from Signy Island,…1 February, 1987
This study follows the psychological profile of a group of Antarctic explorers on a remote base in British Antarctica. Each month for 1 year the 60-item General Health Questionnaire (GHQ)…1 February, 1987 by William Block
Overwintering Delia radicum (L.) in a field of swedes (Brassica napus L.) near Ascot, Berks., England, were exposed to soil temperatures below 10°C on 176 days from 21 October 1983…1 February, 1987 by Richard Horne
Recent observations from the EISCAT incoherent scatter radar have revealed bursts of poleward ion flow in the dayside auroral ionosphere which are consistent with the ionospheric signature of flux transfer…Read more on Non-Maxwellian ion velocity distributions observed using EISCAT
1 January, 1987
Six working groups were set up at the joint IUCN/SCAR Symposium on the scientific requirements for Antarctic conservation. These were charged with (i) identifying gaps in the scientific understanding of…1 January, 1987
James Cook in his voyage of 1774–1775 is generally credited with the discovery of the Antarctic. He was soon followed by fur sealers who by the end of the first…Read more on Antarctic science and conservation — The historical background
1 January, 1987
When interpreting observations of radio waves of low frequency in magnetospheric cavities, it is often assumed that the electron concentration is small enough for the ray paths to be treated…Read more on Theory of wave polarization of radio waves in magnetospheric cavities
1 January, 1987
The theory of radio windows given in two previous papers for a stratified cold plasma is extended to apply in a warm plasma. It is used to investigate one suggested…Read more on The theory of radio windows in planetary magnetospheres
1 January, 1987
The effects of long-term exposures to constant temperatures (+4, 0, −5, −10, −15 and −20°C) on the survival of a cryptostigmatid mite, Alaskozetes antarcticus, were studied during 1983–1984 on Signy…1 January, 1987
At‐sea metabolism (CO2 production) and water turnover of six breeding Grey‐headed Albatrosses Diomedea chrysostoma were measured, using the doubly labelled water method, at Bird Island, South Georgia, Mean food consumption…1 January, 1987 by Andrew Clarke
The zooplankton of the fjords of Svalbard in late summer is dominated by copepodites of Calanus glacialis (JASCHNOV). These are consumed by, among others, the lobate ctenophore Bolinopsis infundibulum (O.F.…Read more on Lipid in an arctic food chain: Calanus, Bolinopsis, Beroe
1 January, 1987
Exploitation of minerals either from continental shelves or land areas free of ice has yet to take place in the Antarctic. The paper considers pressures, commercial, strategic, and possible depletion…1 January, 1987
Travelling ionospheric disturbances with periods in the range 10 < τ < 30 min were observed by an HF Doppier network on the Antarctic Peninsula. A distinction was made between…1 January, 1987
Present threats to Antarctic seabirds and seals when ashore include disturbance and habitat destruction (some directly caused by humans; most through the introduction of rabbits and other grazers; also seal…Read more on The status and conservation of Antarctic seals and seabirds: A review
1 January, 1987
Six island or island groups (Marion and Prince Edwards Islands, Iles Crozet, Iles Kerguelen, Heard and McDonald Islands, Macquarie Island, South Georgia) are considered in this account to belong to…Read more on The biota and conservation status of sub-Antarctic islands
1 January, 1987
The Maritime and Continental Antarctic terrestrial ecosystems are considered in the context of environmental impacts-habitat destruction, alien introductions, and pollution. Their ability to recover from perturbation is discussed in the…1 January, 1987 by Andy Smith, David Vaughan
Rutford Ice Stream drains part of the West Antarctic ice sheet into Ronne Ice Shelf. Much of the drainage basin has a bed well below sea level and is therefore…Read more on Glaciological studies on Rutford Ice Stream, Antarctica
1 January, 1987
Dinoflagellates were identified and counted from preserved vertical net haul samples collected from a station grid centred on South Georgia in austral summer 1981 –1982. All species were scarce in…1 January, 1987
The Dimitobelidae is a Cretaceous belemnite family that was restricted to within the 30° S. palaeolatitude for its Aptian-Maastrichtian range. The family is described in detail from the Antarctic Peninsula…Read more on The Cretaceous Dimitobelidae (Belemnitida) of the Antarctic Peninsula region
1 January, 1987
The deep minimum in total ozone, the ‘ozone hole’, which is now observed each year in early spring in Antarctica, appears to be confined to the cold core of the…Read more on Recent measurements of total ozone at British Antarctic Survey stations
1 January, 1987
Linear belts 50–100 km in width of long-wavelength positive magnetic anomalies exceeding 500 nT are observed on continental blocks of the Scotia arc. The most developed is the West Coast…Read more on Continental magnetic anomalies and the evolution of the Scotia arc
1 January, 1987
Aspects of the breeding biology of the whitc‐chinned petrel Procellaria aequinoctialis were studied at South Georgia. Laying, hatching and fledging dates, together with egg and adult measurements, rate of weight…1 January, 1987
Antarctic fish of the family Channichthyidae (Icefishes) lack the respiratory pigments haemoglobin and myoglobin. The morphometrics and ultrastructure of the ventricular myocardium of a benthic icefish,Chaenocephalus aceratus has been compared…Read more on Morphometrics and ultrastructure of myocardial tissue in Notothenioid fishes
1 January, 1987 by William Block
Soil biological processes which have been studied in the north are extended and compared with those of the south polar region. Much can be learned from exploiting the biological similarities…Read more on Soil biological processes in the North – and South
1 January, 1987
1. Oxygen consumption, mitochondrial content and enzyme activities were determined in identified muscle fibre types of the ‘haemoglobin-less’ icefish Chaenocephalus aceratus Lonnberg. 2. Small bundles (2–12) of fast and slow…1 January, 1987
Second only to auroral kilometric radiation as the Earth's most prominent radio emission, magnetospheric nonthermal continuum radiation has been the subject of numerous observational and theoretical investigations. It has been…Read more on The magnetopause as a source of nonthermal continuum radiation
1 January, 1987
57 morphological characters were scored on a sample of 46 male and 55 characters on a sample of 40 female Gamasellus racovitzai, which had been collected from 10 localities in…1 January, 1987
(1) The sub-Antarctic island of South Georgia has a species-poor vascular flora that is not adapted to grazing by vertebrates. Consequently, reindeer (Rangifer tarandus L.) introduced to different areas of…1 January, 1987 by William Block
Polyacrylamide gel electrophoresis and subsequent esterase staining provide an alternative to immunological methods for investigating the diet of microarthropods which cannot be observed directly. Attack rates in field populations of…1 January, 1987 by Andrew Clarke, Lloyd Peck
The living terebratulid articulate brachiopod Liothyrella uva (Jackson 1912) was sampled from a shallow water population at Signy Island, South Orkney Islands, Antarctica. Neither shell height nor shell breadth were…