Found 14065 items
1 January, 2003 by Gareth Marshall, John King, John Turner, Thomas Lachlan-Cope
The exceptional sea-ice retreat and advance that occurred in the Bellingshausen Sea, Antarctica during August 1993 was the largest such winter event in this sector of the Antarctic during the…Read more on An exceptional winter sea-ice retreat/advance in the Bellingshausen Sea, Antarctica
1 January, 2003 by Andrew Clarke, Lloyd Peck
Quasi-monthly samples of the Antarctic pectinid bivalve Adamussium colbecki were examined to determine the gametogenic pattern and periodicity. Both female and male gametogenic patterns show a very distinct seasonal development,…1 January, 2003
A conceptual model is proposed where bulk transtension, or local transtension during bulk simple shear (resulting from mantle anisotropy- or lithosphere rheology contrasts), of heterogeneously enriched lithospheric mantle, trigger localised…1 January, 2003
A major new synthesis of ophiolite geochronology and map of global Phanerozoic distribution indicates that previously noted pulses of ophiolite obduction can be linked to superplume-related tectonism. A marked cyclicity…Read more on Ophiolite obduction pulses as a proxy indicator of superplume events?
1 January, 2003 by Dominic Hodgson, David Vaughan, Gareth Marshall, John King, John Turner, Robert Mulvaney
The Intergovernmental Panel on Climate Change (IPCC) confirmed that mean global warming was 0.6 +/- 0.2degreesC during the 20th century and cited anthropogenic increases in greenhouse gases as the likely…Read more on Recent rapid regional climate warming on the Antarctic Peninsula
1 January, 2003 by Andy Smith, David Vaughan
The acoustic impedance of the subglacial material beneath 7.2 km profiles on four ice streams in Antarctica has been measured using a seismic technique. The ice streams span a wide…Read more on Acoustic impedance and basal shear stress beneath four Antarctic ice streams
1 January, 2003 by Dominic Hodgson
The water chemistry of lake systems on the edge of the Antarctic continent responds quickly to changes in the moisture balance. This is expressed as increasing salinity and decreasing lake…1 January, 2003 by Roger Worland
The FT-Raman spectra of an Antarctic endolith from the LTER site at Lake Hoare are reported. The specimen provides an unusual occurrence of endolithic colonization of an igneous rock substratum,…Read more on FT-Raman spectroscopic analysis of an Antarctic endolith
1 January, 2003 by Jonathan Watkins
This paper presents Maximum Entropy (MaxEnt) reconstructions of krill distribution and estimates of mean krill density within two survey boxes (dimensions 80 km x 100 km) north of South Georgia.…1 January, 2003 by Peter Ward
During four summer seasons mesozooplankton community composition and structure in relation to water mass distribution were investigated along a 735-km transect running across the Antarctic Circumpolar Current (ACC) to the…1 January, 2003
Tracks made in minerals by the electronic stopping Of uranium fission fragments provide a modern geological dating tool, and are believed also to yield specific information on the low-temperature thermal…1 January, 2003
The Antarctic Peninsula is the largest of ~ twelve micro-continental fragments between southern South America, East Antarctica, and New Zealand. Their original positions and movement history following Gondwana breakup are…1 January, 2003 by Eric Wolff
To an observer from space, the growth and retreat of the white ring of sea ice around Antarctica would be one of the clearest signs that Earth's climate varies on…1 January, 2003 by Eric Wolff
The sea ice surface, not open water, is the dominant source of sea salt to aerosol and ice cores in coastal Antarctica. Here, we show that it may also form…Read more on An ice core indicator of Antarctic sea ice production?
1 January, 2003
1] Lower thermospheric and upper mesospheric rotational temperatures have been derived from ground-based measurements of the O-2(0-1) and OH(6-2) nightglow emissions over Resolute Bay, Canada ( 74.68degreesN, 94.90degreesW) and OH(4-2)…1 January, 2003 by Jonathan Watkins
Acoustic surveys for biomass estimation require accurate identification of echoes from the target species. In one objective technique for identifying Antarctic krill, the difference between mean volume-backscattering strength at two…1 January, 2003
We welcome the development of the debate about structures at the surge-type glacier Kongsvegen, Svalbard. Our paper (Woodward et al., 2002) tested a number of hypotheses proposed in the literature…1 January, 2003
Ground penetrating radar (GPR) is a popular technique for imaging and interpreting sedimentary architecture. However, current literature shows a wide range in the quality of information provided on the GPR…1 January, 2003 by Roger Worland, William Block
Cold tolerant polar terrestrial arthropods have evolved a range of survival strategies which enable them to survive the most extreme environmental conditions (cold and drought) they are likely to encounter.…Read more on Desiccation stress at sub-zero temperatures in polar terrestrial arthropods
1 January, 2003 by Richard Horne
[1] Recently, Robinson et al. [2000] presented a brief report on the artificial generation of ULF waves by high power ionospheric modification and their subsequent detection by the Fast Auroral…1 January, 2003
The diet and breeding performance of Grey-headed Albatrosses Thalassarche chrysostoma and Black-browed Albatrosses Diomedea melanophris breeding at Bird Island, South Georgia, were studied simultaneously during the chick-rearing period between 1996…1 January, 2003 by Paul Rodhouse, Philip Trathan
Cephalopods play an important role in the diet of many predators of the Southern Ocean. We investigated the cephalopod component of the diet of the wandering albatross, during breeding at…1 January, 2003 by Andrew Wood, Philip Trathan
The foraging areas and diets of the grey-headed albatross Thalassarche chrysostoma and wandering albatross Diomedea exulans were studied in March/April 2000 at Bird Island, South Georgia, during their respective chick-rearing…1 January, 2003
Results of TIMS, SIMS and SEM analyses show that zircon and monazite in a high-grade paragneiss of the Ruhla Crystalline Complex, central Germany, were formed and/or altered during different stages…1 January, 2003
The classical model of trough mouth fan (TMF) formation was developed in the Polar North Atlantic to explain large submarine fans situated in front of bathymetric troughs that extend across…Read more on Palaeo-ice streams, trough mouth fans and high-latitude continental slope sedimentation
1 January, 2003
Discovery of at least 100 subglacial lakes beneath the vast East Antarctic Ice Sheet has focused international attention on the challenges presented by the way we conduct science in such…Read more on An International Plan for Antarctic Subglacial Lake Exploration
31 December, 2002
Recent work has suggested that in highly correlated systems, such as sandpiles, turbulent fluids, ignited trees in forest fires and magnetization in a ferromagnet close to a critical point, the…Read more on Extremum statistics: a framework for data analysis
31 December, 2002
The study of the robust features of the magnetosphere is motivated both by new “whole system” approaches, and by the idea of “space climate” as opposed to “space weather”. We…1 December, 2002 by Eric Wolff
This paper discusses the chemical composition of frost flowers and their accompanying slush layers and the evidence for their role as a salt source in processes important to atmospheric chemistry…Read more on Frost flowers – implications for tropospheric chemistry and ice core interpretation
1 December, 2002 by Gareth Marshall, John King, John Turner, Steve Colwell
During the Austral summer of 2001/02 exceptionally heavy sea ice conditions were experienced over the eastern Weddell Sea. Satellite microwave imagery showed that large negative (positive) ice anomalies were present…30 November, 2002 by Michael Pinnock
This study investigates further the relationship between regions of the magnetosphere and the characteristics of HF radar Doppler spectra recorded in the ionospheric projection of those regions. It builds on…Read more on Influence of magnetospheric processes on winter HF radar spectra characteristics
30 November, 2002 by Michael Pinnock
The HF radars of the Super Dual Auroral Radar Network (SuperDARN) provide measurements of the E ×B drift of ionospheric plasma over extended regions of the high-latitude ionosphere. We have…1 November, 2002 by Jonathan Watkins
Acoustic surveys to estimate krill biomass require that the sound backscattered by krill can be identified and distinguished from all other types of backscatter. Sampling acoustic targets with nets to…Read more on Verification of the acoustic techniques used to identify Antarctic krill
31 October, 2002 by Michael Pinnock
The geomagnetic conditions were moderately disturbed (Kp = 2) during magnetic midnight on 10 December 1999, when the Tasman International Geospace Environment Radar (TIGER), a Southern Hemisphere HF SuperDARN radar,…1 October, 2002 by Gareth Chisham, Mervyn Freeman, Michael Pinnock
[1] We present measurements of the convection electric field in the dayside ionosphere during extended intervals when the interplanetary magnetic field (IMF) has a negative Bz component and a significant…1 October, 2002 by Mark Clilverd
Wave-particle interactions driven by whistler mode waves in the inner Van Allan belt is an important loss process for the energetic electrons found in this region. In this paper we…1 October, 2002 by Eric Wolff, Robert Mulvaney
A detailed record of non-sea-salt calcium, a proxy for dust, and sea-salt sodium, a proxy for sea salt, covering the last 45 kyr is presented. It shows that in the…1 October, 2002 by Anna Jones, Eric Wolff
Experimental observations have shown photochemical production in the upper layers of firn. We use a modeling approach for Antarctica in summer, calculating the actinic flux in snowpack, and estimating NOX…31 July, 2002 by Richard Horne
We use plasma wave and electron data from the Combined Release and Radiation Effects Satellite (CRRES) to investigate the viability of a local stochastic electron acceleration mechanism to relativistic energies…1 July, 2002 by Martin Collins
The systematics of the deep-sea cirrate octopod genus Opisthoteuthis Verrill in the Atlantic Ocean is reviewed. Comparisons, based on examination of all extant type material and new, reported and unreported…1 July, 2002 by Martin Collins
Small benthic octopodids of the genus Pareledone are commonly found around the shelf area of the sub-Antarctic island South Georgia but little is known about their biology. During three consecutive…Read more on Distribution of Pareledone spp. (Octopodidae: Eledoninae) around South Georgia
1 June, 2002 by John King
The surface energy budget of coastal polynyas in the southern Weddell Sea has been evaluated for the period 1992–1998 using a combination of satellite observations, meteorological data, and simple physical…Read more on Coastal polynyas in the southern Weddell Sea: variability of the surface energy budget
1 May, 2002
[1] Statistical properties of the interplanetary magnetic field fluctuations can provide an important insight into the solar wind turbulent cascade. Recently, analysis of the Probability Density Functions (PDF) of the…Read more on Finite size scaling in the solar wind magnetic field energy density as seen by WIND
30 April, 2002
Observations made by the DMSP 1710 satellite during the recovery phase from geomagnetic disturbances in June 1991 show regions of He+ dominance around 830 km altitude at 09:00 MLT. These…1 April, 2002 by Claire Waluda, Paul Rodhouse, Philip Trathan
Marine fisheries provide around 20% of animal protein consumed by man worldwide, but ineffective management can lead to commercial extinction of exploited stocks. Fisheries that overlap nationally controlled and high…31 January, 2002 by Gareth Chisham, Michael Pinnock
The HF radar Doppler spectral width boundary (SWB) in the cusp represents a very good proxy for the equatorward edge of cusp ion precipitation in the dayside ionosphere. For intervals…31 January, 2002 by Gareth Chisham, Michael Pinnock
Global convection mapping using line-of-sight Doppler velocity data from the Super Dual Auroral Radar Network (SuperDARN) is now an accepted method of imaging high-latitude ionospheric convection. This mapping process requires…1 January, 2002
The Pacific margin of the Antarctic Peninsula was drilled during Ocean Drilling Program (ODP) Leg 178 to understand the past 10 m.y. of its glacial history and to test a…1 January, 2002 by Mervyn Freeman
[1] We analyze the power spectrum of the line-of-sight ionospheric velocity measured by the SuperDARN CUTLASS Finland radar and of contemporaneous magnetic field perturbations measured by nearby IMAGE magnetometers. The…1 January, 2002 by Paul Rodhouse
A total of 211 juvenile and paralarval squid were collected on five research cruises made in the Scotia Sea region during the austral summer (1996-1999). These included specimens of Alluroteuthis…Read more on Distribution of juvenile squid in the Scotia Sea in relation to regional oceanography
1 January, 2002
Data from a monostatic acoustic radar operating at British Antarctic Survey's Halley station on a coastal Antarctic ice shelf show a band of small target echoes at an altitude of…1 January, 2002
Plasma leptin levels were determined in 8 lactating female and 20 pup Antarctic fur seals (Arctocephalus ga:ella) during fasting periods of normal duration. Plasma leptin levels ranged from 1.35-3.19 ng.ml(-1)…1 January, 2002
We used the otoliths from a sample of Dissostichus eleginoides pre-recruits, whose length density was distinctly polymodal, to see whether ages estimated by reading otoliths were congruent with the length…Read more on Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)
1 January, 2002
The overwintering success of Euphausia superba is a key factor that dictates population size, but there is uncertainty over how they cope with the scarcity of pelagic food. Both nonfeeding…1 January, 2002
Oxygen and carbon isotopic ratios were measured on left-coiling Neogloboquadrina pachyderma separated from sediments recovered from Holes 1096B (3152 m water depth) and 1101A (3280 m water depth) during Ocean…1 January, 2002
During Leg 178, multiple advanced piston corer holes were drilled at our sites (1095, 1096, 1098, and 1099). Cores from the holes were correlated on board to produce composite depths…1 January, 2002 by Iain Staniland
The Antarctic fur seal (Arctocephalus gazella) and macaroni penguin (Eudyptes chrysolophus) are sympatric top predators that occur in the Southern Ocean around South Georgia where they are, respectively, the main…Read more on Are penguins and seals in competition for Antarctic krill at South Georgia?
1 January, 2002
In marine ecosystems, characterisation of the foraging areas and habitats of predators is a key factor in interpreting their ecological role, We studied the foraging areas of the macaroni penguin…1 January, 2002
Understanding how parental expenditure reflects food availability and influences reproductive output is a key part of studies of breeding performance. Provisioning behaviour is an important aspect of parental expenditure. We…Read more on Provisioning behaviour of macaroni penguins Eudyptes chrysolophus
1 January, 2002 by David Barnes
Bryozoans seem fairly typical amongst Antarctic benthos, in both timing and magnitude of growth. Growth varies interspecifically from nearly comparable to much slower than warm water equivalent species. Factors including…Read more on Modelling multivariate determinants of growth in Antarctic bryozoans
1 January, 2002 by David Barnes
Two clades of marine bryozoans, cyclostomes and cheilostomes, exemplify the benefits of applying a multidisciplinary approach to the interpretation of long-term evolutionary patterns. The cyclostome bryozoans were dominant in the…1 January, 2002 by David Barnes
There is a complex and dynamic interrelationhip between hermit crabs, humans and the coastal environment. Hermit crab homes (shells) are often hard to come by, but humans are helping out…1 January, 2002 by David Barnes
Colonization by alien species poses one of the greatest threats to global biodiversity1. Here I investigate the colonization by marine organisms of drift debris deposited on the shores of 30…1 January, 2002 by David Barnes
Many organisms overlap in their use of resources in space and time. Where and when resources are restricted, species must compete for them. Living space, often a critical resource controlling…Read more on Polarization of competition increases with latitude
1 January, 2002 by David Barnes
1. Resources vary critically in space and time so the ability of animals to utilize them necessarily does so in sympathy. For hermit crabs in coastal SW Madagascar, a critical…1 January, 2002 by David Barnes
Populations of the echinoid Paracentrotus lividus have undergone spectacular population fluctuations over the last 40 yr at Lough Hyne, SW Ireland, Censuses in 2000 and 2001, reported here, show no…1 January, 2002 by Eric Wolff, Robert Mulvaney
The microstructure and location of impurities in polar ice are of great relevance to ice core studies. We describe a reliable method to examine ice in the scanning electron microscope…Read more on A technique for the examination of polar ice using the scanning electron microscope
1 January, 2002 by Eric Wolff, Robert Mulvaney
[1] Electrical conductivity measurements made using the dielectric profiling technique (DEP) are compared to chemical data from the top 350 m of the Dome C ice core in Antarctica. The…Read more on Effect of density on electrical conductivity of chemically laden polar ice
1 January, 2002 by Eric Wolff, Robert Mulvaney
Samples taken from the Dome C ice core, Antarctica, and the GRIP ice core, Greenland, are examined using the scanning electron microscope to determine their microstructure. In both cores, samples…1 January, 2002
We studied the mercury contamination of 13 species of seabirds breeding on Bird Island, South Georgia, in 1998. Total mercury concentrations in body feather samples of birds caught at their…1 January, 2002 by David Barnes
A series of measurements were taken from 50 random examples of the arborescent sponges Raspailia rainosa and Stelligera stuposa at a number of sites and depths at Lough Hyne, Co.…1 January, 2002
1. The food consumption of an animal. both at the individual and the population level, is an essential component for assessing the impact of that animal on its ecosystem. As…Read more on The energetics of gentoo penguins, Pygoscelis papua, during the breeding season
1 January, 2002 by Alistair Crame
Brachiopods are reported for the first time from the Lower Miocene Cape Melville Formation of King George Island, South Shetland Islands, West Antarctica. Two genera, Liothyrella Thomson and Paraldingia Richardson…Read more on Brachiopods from the Lower Miocene of King George Island, West Antarctica
1 January, 2002 by William Block
Four case studies are used to examine the relationships of water, ice nucleators and desiccation in the cold survival of invertebrates and the viability of frozen plant material: the freeze…Read more on Interactions of water, ice nucleators and desiccation in invertebrate cold survival