Showing 9284 items
1 January, 1985 by Michael Pinnock
A summer, dayside, mid-latitude trough detected by a digital ionosonde located at Halley (76°S, 27°W, L = 4.2) is described. The trough is found to be present in the F2-region…Read more on Observations of a day-time mid-latitude ionospheric trough
1 January, 1985
Dielectric experiments have been undertaken at temperatures between −2° and −70° C in the frequency range 10Hz to 100 kHz on 14 firn and ice samples retrieved from the Antarctic…Read more on Dielectric behaviour of firn and ice from the Antarctic Peninsula, Antarctica
1 January, 1985
The paper discusses how profiles of electron and/or ion distributions that are produced by two different computer models can be smoothly coupled together. The first of these models is the…Read more on Modelling the plasmasphere for the international reference ionosphere
1 January, 1985
Brood reduction is common in a population of Blue‐eyed Shags on Signy Island, South Orkney Islands. This paper describes possible adaptations which may reduce the brood. In clutches of three,…Read more on Brood reduction in the Blue-eyed Shag Phalacrocorax atriceps
1 January, 1985
The realistic model of Quegan et al. has been used to investigate the convection paths of ionospheric plasma at 300 km altitude, for different polar cap radii and in both…Read more on Modelling studies of ionospheric convection in northern and southern polar regions
1 January, 1985
A new and well-preserved.asteroid, Protremaster uniserialis (gen. & sp.nov.) is described from the Lower Jurassic (Sinemurian) of Antarctica. This find extends the fossil record of the family Asterinidae and the…Read more on Protremaster, a new Lower Jurassic genus of asteroid from Antarctica
1 January, 1985
Parametric and nonparametric analyses were used to investigate the relationships between the populations of viable microbes and 4 edaphic variables — soil moisture, rainfall, temperature, and pH. Microbial populations were…1 January, 1985
Smith (1982) reported the discovery in 1981 of Antarctic hair grass Deschampsia antarctica Desv. on the largest of the Refuge Islands (68° 21' S) in Marguerite Bay, off the south-west…Read more on New southernmost record for Antarctic flowering plants
1 January, 1985
Beauchêne Island is the most isolated of the Falkland Islands archipelago and until the authors' visit there in 1980 little was known or published about the island and its biota…1 January, 1985
The 35 × 20 km Cerro Galán resurgent caldera is the largest post-Miocene caldera so far identified in the Andes. The Cerro Galán complex developed on a late pre-Cambrian to…Read more on Ignimbrites of the Cerro Galan caldera, NW Argentina
1 January, 1985
The installation of a Fabry–Perot interferometer at Halley (75.5° S, 26.8° W; L = 4.2), Antarctica, has now allowed the first comparison to be made between Southern Hemisphere ground-based thermospheric…1 January, 1985
A subduction-accretion model incorporating new geophysical data is presented to explain the geology of the Antarctic Peninsula from late Palaeozoic to Cenozoic time. According to the model, the peninsula consists…Read more on Crustal growth of the Antarctic Peninsula by accretion, magmatism and extension
1 January, 1985
Whole‐rock and mineral analyses of polydeformed mica‐schist, quartzite, marble and amphibolite are presented from Signy Island, South Orkney Islands, part of the Scotia metamorphic complex. Whole‐rock chemistry suggests that the…1 January, 1985
Ninety nine per cent of all the fresh water on the surface of the Earth is in the form of ice. Observations from space have revealed more about the ice…1 January, 1985
Albert Armitage was the second in command of both the Jackson-Harmsworth expedition of 1884–1897 and R. F. Scott's British National Antarctic Expedition, 1901–1904. He never led an expedition himself; as…1 January, 1985 by Jonathan Watkins
The lengths of 9 421 Antarctic krill, Euphausia superba Dana, from 144 net samples from 4 depth ranges at the same location (north east of South Georgia) were measured over…1 January, 1985 by Eric Wolff
Recent snow from two sites in the Antarctic Peninsula has been analyzed for Al, Cd, Cu, Pb and Zn. Measurement of full procedural blanks and of the extent of penetration…1 January, 1985 by Eric Wolff
Many attempts have been made to trace increases in global pollution from the record of impurities preserved in polar snow and ice layers. Although inadequate sampling and analysis techniques have…Read more on The record of global pollution in polar snow and ice
1 January, 1985
Citifluor, a photofading retardant for epifluorescence studies, was evaluated as a mountant for enhancing algal autofluorescence and Acridine Orange (AO) fluorescence of bacteria and fungi in mineral soils from Antarctic…Read more on Photofading retardant for epifluorescence microscopy in soil micro-ecological studies
1 January, 1984
Single fast fibres and small bundles of slow fibres were isolated from the trunk muscles of an Antarctic (Notothenia neglecta) and various warm water marine fishes (Blue Crevally,Carangus melampygus; Grey…1 January, 1984
The three-spacecraft AMPTE Mission was due to commence in August 1984. The purpose of these 'active' experiments was firstly to release lithium into the solar wind and to use the…1 January, 1984
Speed, direction, temperature, and conductivity were recorded from February to July 1980 within the thermocline near the northern ice front of George VI Ice Shelf. There were no significant changes…Read more on Current, temperature, and salinity beneath George VI Ice Shelf, Antarctica
1 January, 1984
Filtration rates of adolescent Euphausia superba obtained by both constant volume and flow-through techniques are presented. Filtration rate data for a range of particle sizes are presented. An increase in…Read more on Filtration rates of Euphausia superba Dana: under- or overestimates?
1 January, 1984 by Peter Ward
Relations between a model of the feeding activ- ity of Euphausia superba, the oceanic environment and the vertical distribution of krill around South Georgia are described. Krill with full alimentary…1 January, 1984
The oxygen consumption rates of five species of sub-Antarctic fish, Notothenia rossii Fischer, 1885; Notothenia angustifrons Fischer, 1885; Notothenia nudifrons Lonnberg, 1905; Trematomus hansom Boulenger, 1902; and Harpagifer georgianus Richardson,…Read more on Oxygen consumption of five species of fish from south Georgia
1 January, 1984 by Andrew Clarke
The ciliated protozoan Tetrahymena pyriformis has been used to study the biochemistry of cellular injury induced by rapid cooling (cold shock). Cellular viability was found to depend on the time…1 January, 1984
The relationship between isotope concentration and salinity provides important evidence on the origin of water masses. In polar regions it can be used to deduce the isotopic composition of melting…1 January, 1984
Data are assembled from a number of sources on several species of Procellariiformes breeding on South Georgia, covering the amount, frequency and energetic content of feeds brought to the young,…1 January, 1984
Glaciological estimates of the ice supply to George VI Ice Shelf are obtained by integrating the accumulation over the catchment. The basal melt (or possible shelf thickening) rates for the…1 January, 1984
An artificial nest incorporating an automated weighing device, suitable for chick growth studies on some species of seabirds, is described. (2) The operating weight range is 1-7 kg, with an…Read more on Automated measurement of meal sizes and feeding frequency in albatrosses
1 January, 1984
Activity recorders were attached to 13 Gray-headed Albatrosses (Diomedea chrysostoma) rearing chicks at South Georgia in February 1982. During foraging trips to sea totalling 284 bird-days, an average of 74%…Read more on Activity budgets of foraging gray-headed albatrosses
1 January, 1984
Georesistivity soundings have been carried out at four sites in the Antarctic Peninsula. The objective of the work was to investigate the electrical behaviour of ice from an area where…Read more on Electrical resistivity of ice from the Antarctic Peninsula, Antarctica
1 January, 1984
A knowledge of the assimilation of food and of the energetic demands of chicks at different stages in the growth period can provide a basis for understanding growth strategies of…1 January, 1984
The signature of the stable auroral red arc (SAR arc) as it appears on ionograms is described. The key features are a very significant increase in the amount of spread-F…1 January, 1984 by Michael Pinnock
We describe a simple method for determining the time at which the meridian of a sub-auroral magnetic observatory crosses that of the Harang discontinuity—the separation of the eastward and westward…1 January, 1984
Position fixes made at the British Antarctic Survey station, Halley, on the Brunt Ice Shelf are considered for the period 1968–82. These show an initial westward velocity of approximately 400…Read more on Accelerating flow of the Brunt Ice Shelf, Antarctica
1 January, 1984
Southernmost of the Falkland Islands, Beauchêne Island (52° 54' S, 59° 09' W, area 3 km2) is a wildlife reserve with large colonies of Black-browed albatrosses and Rockhopper penguins. Discovered…1 January, 1984
Most of Beauchêne Island in the South Atlantic is covered by tussac, the tussock-forming grass Poa flabellata (Lam.) Rasp., which has produced a deep accumulation of exceptionally dense peat during…Read more on An extraordinary peat-forming community on the Falkland Islands
1 January, 1984
Two methods were used to locate the grounding line on the Rutford Ice Stream. The first method determined where the glacier was floating in hydrostatic equilibrium, while the second method…1 January, 1984 by William Block
The resistance of Halozetes marinus (Cryptostigmata) and Hyadesia maxima (Astigmata) to cold and heat, to submergence in water and to anoxia was studied to determine their adaptations to the intertidal…Read more on Ecophysiology of two intertidal mites at South Georgia
1 January, 1984
Aboard the Porcupine rockets, bursts of noise were detected in the electron whistler range during the operation of a xenon plasma gun on a package ejected from the main payload.…Read more on Excitation of the lower oblique resonance by an artificial plasma jet in the ionosphere