Showing 11862 items
1 February, 1992 by Eric Wolff
Antarctic and Greenland ice core samples were studied using two different stratigraphic electrical techniques. The electrical conductivity measurement (ECM) technique is a dc method, while dielectric profiling (DEP) is an…Read more on The chemical basis for the electrical stratigraphy of ice
1 February, 1992 by Jonathan Watkins
Measurements on krill from distinct swarms and echo-sounder measurements of the same swarms have been analysed using multivariate methods. The analysis has addressed the problems of whether krill swarms in…1 February, 1992
We present the initial results of a quantitative investigation of the volatile geochemistry of Deception Island, an active volcano situated near the spreading axis of a Quaternary ensialic marginal basin…1 February, 1992
Changes in plasma luteinizing hormone (LH), testosterone, oestradiol, and progesterone were measured throughout the breeding and molt cycle in free-living male and female macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua)…1 February, 1992
Plasma levels of LH, testosterone, estradiol, and progesterone were measured, during the breeding season, in adult and immature macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins, at Bird Island, South…1 January, 1992
This study describes a method for extracting post-canine or incisor teeth from live antarctic fur seals (Arctocephalus gazella) and southern elephant seals (Mirounga leonina) respectively and their use to determine…Read more on Aging live Antarctic fur seals and southern elephant seals
1 January, 1992 by Howard Roscoe
Radiative transfer within an interferometric spectrometer is discussed in relation to measurements of infrared transmittance spectra of gases. It is shown that for certain types of interferometric spectrometers, radiation from…1 January, 1992 by William Block
1 January, 1992
The diving behaviour of 11 lactating female Antarctic fur seals (Arctocephalus gazella) was recorded for a total of 254 animal-days at sea. Median and maximum dive depths for individuals varied…Read more on Diving behaviour of lactating Antarctic fur seals
1 January, 1992
Heart rate (fH) and rate of oxygen uptake (VO2) were measured in six subadult California sea lions Zalophus californianus while they were at rest and while they were swimming for…1 January, 1992 by Andrew Clarke
Although a tendency for high latitude marine invertebrates to avoid pelagic larval stages was first described in the 19th century, the most detailed early study was that of Thorson in…1 January, 1992 by Andrew Clarke
Samples of ovigerous female Ceratoserolis trilobitoides carrying newly spawned (stage A1) eggs in the marsupium were obtained from Borge Bay, Signy Island (South Orkney Islands), the continental shelf near Elephant…Read more on Egg size and composition in Ceratoserolis (Crustacea: Isopoda) from the Weddell Sea
1 January, 1992 by Mark Clilverd
Whistler mode group delays observed at Faraday, Antarctica (65° S, 64° W) and Dunedin, New Zealand (46° S, 171° E) show sudden increases of the order of hundreds of milliseconds…1 January, 1992 by Mark Clilverd
Whistler mode signals from NLK (24.8 kHz) were received at Dunedin, New Zealand during 1989-90. The arrival bearing of the signals shows a bimodal distribution which is consistent with the…1 January, 1992
During 1986, a series of special VLF transmissions at ∼3 kHz and ∼5 kHz were made from the crossed dipole antenna at Siple Station, Antarctica, which simulated transmissions from a…1 January, 1992 by Alistair Crame
With the recent rapid increase in our knowledge of the palaeontological history of both polar regions it has become apparent that they should now be regarded as something more than…1 January, 1992
The Antarctic marine environment contains a range of hydrocarbons at low concentrations, which are generally biogenic in origin. All major classes of hydrocarbons have been found in the Antarctic ecosystem.…Read more on Natural and anthropogenic hydrocarbons in the Antarctic marine environment
1 January, 1992
Low level hydrocarbon contamination is measurable in the vicinity of Antarctic stations, N-alkane and polycyclic aromatic hydrocarbon (PAH) concentrations in seawater and sediment at Signy Station, South Orkney Islands indicated…1 January, 1992
Field studies carried out on the Antarctic brown macroalga Himantothallus grandifolius (A. Gepp et E.S. Gepp) A.D. Zinova (Desmarestiales, Phaeophyta) during two summers and an intervening winter season are described.…1 January, 1992
The prediction of short-term (100 year) changes in the mass balance of ice sheets and longer-term (1000 years) variations in their ice volumes is important for a range of climatic…Read more on The response of large ice sheets to climatic change
1 January, 1992
Trilobites devonicos de Buill, Chile (42°S). Se describe un trilobites calmoniido (Calmoniidae gen. nov. aff. Bainella Rennie, 1930) un trilobites lacopoide indeterminado y un coral zafrentido, recolectados en rodados de…1 January, 1992
In the late 1970s, many people still thought that a cooling trend in the Northern Hemisphere heralded the next ice age. But some were already claiming that rising atmospheric CO2…1 January, 1992
1.1. Dynamics of plasma nutrients and metabolites in moulting macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins were studied.2.2. The late moult macaroni and gentoo penguins had significantly elevated levels…1 January, 1992
Snow Petrels (Pagodroma nivea) breed circurnpolarly in Antarctica. Watson et al. (1971), Harper et al. (1984) and Marchant & Higgins (1990) list breeding sites in the Ross Dependency (160°E-150°W) and…1 January, 1992
Previously, we reported on the discovery of fine structure in whistler data received on the ground at Halley, Antarctica. This structure was not apparent in conventional spectral analysis but was…1 January, 1992
We studied the distributions, abundances and interactions of macaroni penguins Eudyptes chrysolophus, Antarchc fur seals Arctocephalus gazella, and their zooplankton prey, m particular Antarctic krill Euphausia superba, near Bird Island,…1 January, 1992
References Citations Metrics Reprints & Permissions PDF Abstract The beaks of 9,994 cephalopods of 61 species, obtained mainly from chick regurgitations of wandering albatrosses (Diomedea exulans L.)…1 January, 1992 by Adrian Jenkins
We calculate the present ice budget for Antarctica from measurements of accumulation minus iceberg calving, run-off and in situ melting beneath the floating ice shelves. The resulting negative mass balance…Read more on Melting of ice shelves and the mass balance of Antarctica
1 January, 1992 by Philip Leat
A two-day meeting of the Tectonic Studies Group was held in London at the Geological Society on 3-4 October 1991, to consider relationships between continental extension, super continent break-up, magmatism…Read more on Magmatism and the causes of continental break-up
1 January, 1992 by Thomas Lachlan-Cope
Atmospheric temperature retrievals obtained by a simultaneous physical scheme and a statistical scheme are compared using data gathered over the Weddell Sea, Antarctica during January 1986. Ground truth data were…1 January, 1992
During the lactation period, female otariid seals alternate trips at sea to feed with visits ashore to nurse their pups. A female returning ashore must be able to recognize her…Read more on Fostering behaviour and milk stealing in Antarctic fur seals
1 January, 1992 by Robert Mulvaney
The east coast of the Antarctic Peninsula is strongly influenced by air masses that have traversed the Weddell Sea zone. A continuous record of annual-average values for δ18O, δD, Cl−…1 January, 1992 by Eric Wolff, Robert Mulvaney
Antarctic snow and ice contain very low concentrations of ions,Read more on The distribution of impurities in Antarctic ice
1 January, 1992
F-layer ionisation troughs are frequently observed in the sub-auroral and high-latitude ionospheres. We define the mid-latitude trough as the region of low plasma concentration at F-region altitudes that occurs near…1 January, 1992 by Eric Wolff, Robert Mulvaney
A technique, using Nuclepore polycarbonate membrane filters as a containing medium for very small volumes of ionic standard solutions, to produce homogeneous ice standards is described. The standards are suitable…Read more on Preparation of aqueous standards for low temperature x-ray microanalysis
1 January, 1992
A mathematical model of the ionosphere and plasmasphere that includes an eccentric dipole geomagnetic field has been constructed to model, in the first instance, whistler results at L = 2.5.…Read more on Seasonal and longitudinal effects on plasmaspheric tube content
1 January, 1992 by Paul Rodhouse
In the austral summers of 1986 and 1988–1989, 51 southern elephant seals (Mirounga leonina) at Husvik, South Georgia (54°10′S; 36°43′W), were stomach lavaged after chemical immobilization. Only cephalopod remains were…Read more on Cephalopod prey of the southern elephant seal, Mirounga leonina L.
1 January, 1992 by Paul Rodhouse
Cephalopod paralarvae and juveniles were sampled with RMT8 and Bongo nets during 2 cruises of the MV 'Falklands Protector' in the southwest Atlantic Ocean in October/November 1990 and 1991. Each…1 January, 1992
Simultaneous ground-based observations of narrowband and broadband VLF radio waves and of cloud-to-ground lightning were made at widely spaced locations during the 1987 Wave-Induced Particle Precipitation (WIPP) campaign, conducted from…1 January, 1992 by Howard Roscoe
The measurement of N2O5 by Evans [Appl. Opt. 25, 1866–1868 (1986)] contains several serious errors. A reanalysis of the published infrared spectra gives the more realistic error bar of ±45%.Read more on Observation of the 8-μm N2O5 thermal emission feature in the stratosphere: comment
1 January, 1992 by Howard Roscoe
In a new program which performs a Backus-Gilbert analysis of the output kernels from the input kernels of any hypothetical remote sensor, Conrath's method for calculating trade-off curves has been…1 January, 1992 by Mark Clilverd
The group delay times (tg) of whistler-mode waves generated by the NAA (f= 24.0 kHz) and NSS (f = 21.4 kHz) U.S. Navy transmitters and recorded at Faraday, Antarctica (L=…1 January, 1992
Palynomorph assemblages dominated by dinoflagellate cysts are described from seventeen samples from the Rabot Member of the Santa Marta Formation at Ekelöf Point, eastern James Ross Island, Antarctic Peninsula. Although…1 January, 1992 by Eric Wolff
Cadmium, copper, lead and zinc concentrations have been measured on a sequence of snow blocks covering 2 years’ accumulation at a site on the east coast of the Antarctic Peninsula.…Read more on Seasonal input of heavy metals to Antarctic snow
1 January, 1992
References Citations Metrics Reprints & Permissions Get access The standard of Antarctic maps in many of the world atlases on sale in the UK is reviewed and the…1 January, 1992 by Richard Horne
The excitation of SAR arcs requires the transfer of energy from the energetic storm-time ring current ions to tonal electrons located just inside the plasmapause. A recent observational study has…1 January, 1992
The LeMay Group of Alexander Island, Antarctic Peninsula, is a Mesozoic accretionary prism that was constructed during subduction of Pacific and proto-Pacific oceanic crust. In central Alexander Island, several distinct…1 January, 1992 by John Turner
An atmospheric transmittance model has been applied to Antarctic radiosonde ascents in order to examine the high-latitude normalized weighting functions (NWF) of the water vapour channels on the High Resolution…Read more on High-latitude moisture structure determined from HIRS water vapour imagery
1 January, 1992 by Jonathan Watkins
Length, sex and maturity stage of Antarctic krill Euphausia superba Dana occurring in discrete swarms were measured. Over a 14 d period 38 swarms were sampled in a small area…1 January, 1992
Syenogranites and monzogranites of Edward VII Peninsula, Marie Byrd Land, represent magmatism associated with continental rifting and the separation of New Zealand from W Antarctica in the mid-Cretaceous. These coarse-grained,…1 January, 1992
1. Plasma concentrations of urea, uric acid and total lipid were compared in pre- and late-fast breeding and moulting macaroni penguins (Eudyptes chrysolophus) to test the hypothesis that birds exhaust…Read more on Breeding and moulting fasts in macaroni penguins: Do birds exhaust their fat reserves?
1 January, 1992
Annual variation in return rate of breeding birds, mate and nest-site fidelity was studied in the resident Gentoo (Pygoscelis papua) and migratory Macaroni (Eudyptes chrysolophus) Penguin from 1986 to 1990…1 January, 1992
We studied diving patterns and performance (dive depth, duration, frequency and organization during the foraging trip) in relation to diet in nonbreeding Gentoo Penguins (Pygoscelis papua) over 59 days (involving…1 January, 1992 by Eric Wolff
The Antarctic ice sheet is the main sink for atmospheric pollution reaching the Antarctic atmosphere from other continents. The ice preserves a historical record of the atmosphere that can be…1 January, 1992
Thirty samples from two sections on south-western Humps Island, James Ross Basin, northern Antarctic Peninsula, contain moderately diverse dinoflagellate cyst assemblages deposited in shallow shelf, open marine conditions. Assemblages contain…Read more on Dinoflagellate cysts from the Marambio Group (Upper Cretaceous) of Humps Island
1 January, 1992 by Roger Worland, William Block
The ability of adults and larvae of two species of perimylopid beetles (Hydromedion sparsutum, Perimylops antarcticus) to survive sub-zero temperatures was studied at Husvik, South Georgia in summer during October–December…1 December, 1991
Seabirds of high latitudes in the North and South Atlantic (chiefly penguins, Procellariformes, alcids, shags, Gannet and Kittiwake) are compared (on absolute and energy-, mass- and time-specific scaled bases) in…Read more on Foraging economics and performance of polar and subpolar Atlantic seabirds
1 December, 1991 by Alistair Crame
One of the most important outcrops of uppermost Cretaceous (Campanian–Maastrichtian) sedimentary rocks in the southern high latitudes occurs within the James Ross Island group, northeastern Antarctic Peninsula. These rocks comprise…1 December, 1991
Geochemical and isotopic data are presented that suggest the existence of a large, Middle Jurassic subduction‐related magmatic province common to both the Antarctic Peninsula and southern South America. We argue…1 December, 1991
The population structure and transmission of Escherichia coli in a small group of individuals isolated for 26 weeks on an Antarctic base were studied by multilocus electrophoresis of eight enzymes…1 November, 1991
The burst precipitation of energetic electrons (≥40 keV), induced by interactions with lightning‐generated whistler mode waves, has been observed to cause phase and amplitude perturbations on subionospheric VLF signals (“Trimpi”…1 November, 1991 by Adrian Jenkins
Large‐scale oceanic circulation beneath Antarctic ice shelves is driven by the thenmohaline differences which result from mass and energy exchange at the ice‐ocean interface. Dense, saline waters are drawn underneath…Read more on A one-dimensional model of ice shelf-ocean interaction
1 November, 1991 by Robert Larter
Precise measurements of spreading rates on marine magnetic profiles collected to the west of the Antarctic Peninsula have enabled some consideration of the forces governing plate motion, since Antarctic—Phoenix motion…1 November, 1991 by Keith Makinson, Keith Nicholls
THE intimate thermal contact between the base of Antarctic ice shelves and the underlying ocean enables changes in climate to have a rapid impact on the outflow of ice from…