Found 14089 items
1 January, 2005 by Martin Collins, Simeon Hill
The mackerel icefish Champsocephalus gunnari Lönnberg is an important component of the ecosystem at South Georgia. Its diet is dominated by Antarctic krill Euphausia superba; in turn, it is also…1 January, 2005 by Howard Roscoe
Eleven vertical profiles of stratospheric NO3 have been obtained since 1992 using the AMON and SALOMON balloon-borne UV-visible spectrometers. The measurements are compared to the SLIMCAT 3D model and calculations…1 January, 2005 by Andrew Clarke, Alistair Crame
Large-scale biogeographic patterns in marine systems are considerably less well documented and understood than those in terrestrial systems. Here, we synthesize recent evidence on latitudinal and bathymetric gradients of species…1 January, 2005 by Teal Riley
Teal Riley has been digging around in the geological record to find out more about what causes supervolcanoes to erupt.1 January, 2005 by Philip Leat, Teal Riley
A suite of dolerite dykes from the Ahlmannryggen region of western Dronning Maud Land (Antarctica) forms part of the much more extensive Karoo igneous province of southern Africa. The dyke…1 January, 2005 by Mark Clilverd
In this study we examine energetic electron precipitation fluxes driven by lightning, in order to determine the global distribution of energy deposited into the middle atmosphere. Previous studies using lightning-driven…1 January, 2005 by Howard Roscoe, Jonathan Shanklin, Steve Colwell
Many long-term monitoring sites in Antarctic regions, which deploy ground-based stratospheric remote sensors and fly radiosondes or ozonesondes on balloons, supported the Airborne Polar Experiment in September and October 1999.…Read more on Measurements from ground and balloons during APE-GAIA – A polar ozone library
1 January, 2005 by Howard Roscoe, Jonathan Shanklin, Steve Colwell
In late September 2002, the Antarctic ozone hole was seen to split into two parts, resulting in large increases in ozone at some stations and the potential for significant modification…1 January, 2005 by Mark Clilverd, Michael Rose
We describe a new polar mesosphere summer echo (PMSE) radar system implementation that uses a snow-buried antenna operated with the dynasonde at Halley, Antarctica (76°S), the highest southern latitude at…Read more on Polar mesosphere summer echo detection using a dynasonde
1 January, 2005
Approaches to modelling gene regulation networks can be categorized, according to increasing detail, as network parts lists, network topology models, network control logic models, or dynamic models. We discuss the…Read more on Modelling gene networks at different organisational levels
1 January, 2005 by Dominic Hodgson
Cyanobacteria are the dominant phototrophs in Antarctic biota where they form conspicuous microbial mats at the bottom of lakes and ponds. In the frame of the OSTC project LAQUAN (EV/12/1B),…Read more on Which cyanobacterial genotypes are observed in microbial mats of Antarctic lakes?
1 January, 2005 by William Block
The encapsulation-dehydration cryopreservation protocol is critically dependent upon the evaporative desiccation step, which must optimise survival with the retention of glass stability on sample cooling and rewarming. Desiccation is usually…1 January, 2005 by Geraint Tarling, Jonathan Watkins, Peter Ward
Antarctic krill are often described as the major species in Southern Ocean food webs, but there have been no direct site-specific comparisons between their production and that of copepods that…1 January, 2005 by Geraint Tarling
1. Megaplanktivores such as filter-feeding sharks and baleen whales are at the apex of a short food chain (phytoplankton–zooplankton–vertebrate) and are sensitive indicators of sea-surface plankton availability. Even though they…1 January, 2005 by Andy Smith
No abstract available for this article. Text not available online.Read more on Exploring with explosions: looking beneath the Antarctic ice sheet with seismic surveys
1 January, 2005
Deception Island is one of the most volcanically active sites south of 60°S. Between 1967 and 1970 three major eruptions devastated large expanses of the landscape and its predominantly cryptogamic…Read more on The bryophyte flora of geothermal habitats on Deception Island, Antarctica
1 January, 2005
Deception Island in the South Shetland Islands is one of the most volcanically active sites south of 60°S. Between 1967 and 1970 three major eruptions devastated large expanses of the…1 January, 2005
A comparison is made of the bryophyte floras of two small maritime Antarctic islands lying at similar latitudes and with similar climates and glacial topographies, but differing markedly in their…Read more on Bryophyte diversity and ecology of two geologically contrasting Antarctic islands
1 January, 2005
Peltigera didactyla (With.) J. R. Laundon has a cosmopolitan distribution, but in the Antarctic it is very restricted and is nowhere common or abundant, occurring at a number of sites…1 January, 2005 by Dominic Hodgson
A sediment core from Progress Lake, one of the oldest lacustrine sequences in East Antarctica, contains distinct zones dating from a previous interglacial (most likely Marine Isotope Stage 5e, c.…1 January, 2005 by Kevin Hughes
Aims: To identify native Antarctic bacteria capable of oil degradation at low temperatures. Methods and Results: Oil contaminated and pristine soils from Signy Island (South Orkney Islands, Antarctica) were examined…1 January, 2005 by Iain Staniland
We compared the use of fatty acid signature analysis with results from traditional faecal methods using milk samples and enemas concurrently collected from 8 female Antarctic fur seals Arctocephalus gazella…1 January, 2005 by Iain Staniland
1 January, 2005
The depletion of shallow-water fish stocks through overexploitation has led to increasing fishing pressure on deep-sea species. Poor knowledge of the biology of commercially valuable deep-water fish has led to…1 January, 2005 by Claus-Dieter Hillenbrand, Robert Larter
Environmental conditions fostering marine communities around Antarctica differ fundamentally from those in the rest of the world's oceans, particularly in terms of pronounced climatic fluctuations and extreme cold. Here, we…Read more on On the origin of Antarctic marine benthic community structure
1 January, 2005
One hundred years of geological research in and around Antarctica since Scott's Discovery expedition of 1901-1904 have seen the continent move from a great unknown at the margins of human…1 January, 2005 by Mark Clilverd
On 4 November 2003, the largest solar flare ever recorded saturated the GOES satellite X-ray detectors, making an assessment of its size difficult. However, VLF radio phase advances effectively recorded…Read more on Large solar flares and their ionospheric D region enhancements
1 January, 2005 by Richard Horne
Energetic electrons in the outer radiation belt can resonate with intense bursts of whistler-mode chorus emission leading to microburst precipitation into the atmosphere. The timescale for removal of outer zone…Read more on Timescale for MeV electron microburst loss during geomagnetic storms
1 January, 2005 by Sally Thorpe
A comparison between hydrographic observations and output from two realistically forced z-level global ocean circulation models (OCCAM and POCM_4C) in the Scotia Sea, South Atlantic, is described. The study region…1 January, 2005 by Fausto Ferraccioli
We present evidence for melting at the base of the ice that overlies Lake Concordia, an 800 km2 subglacial lake near Dome Concordia, East Antarctica, via a combination of glaciohydraulic…Read more on Influx of meltwater to subglacial Lake Concordia, East Antarctica
1 January, 2005 by Jaume Forcada
Here we assessed retinoids as biomarkers of contaminant exposure by studying whether the sex, age, lipid content and organochlorine concentrations of bottlenose dolphins induced variation in retinoid status and its…1 January, 2005 by John Turner
Abstract and full text of this article are not available online.Read more on Aspects of modern Antarctic meteorology and climatology
1 January, 2005 by Gareth Marshall, John Turner, Steve Colwell, Thomas Lachlan-Cope
The Reference Antarctic Data for Environmental Research (READER) project data set of monthly mean Antarctic near-surface temperature, mean sea-level pressure (MSLP) and wind speed has been used to investigate trends…Read more on Antarctic climate change during the last 50 years
1 January, 2005 by Gareth Marshall, John Turner, Steve Colwell, Thomas Lachlan-Cope
In situ observations of precipitation days (days when snow or rain was reported in routine synoptic observations) from Faraday/Vernadsky station on the western side of the Antarctic Peninsula, and fields…1 January, 2005 by Mark Belchier
During the past decade, quantification of the pigment lipofuscin in the olfactory lobe cell masses (OLCM) has been successfully used for age determination of crustaceans. The aim of the current…1 January, 2005
The Lower Cambrian Pardailhan Formation of the Montagne Noire (Southern France) has yielded a diverse fossil assemblage including bivalved arthropods (the bradoriids Monceretia erisylvia gen. et sp. nov., Cambria danvizcainia…Read more on New Early Cambrian bivalved arthropods from southern France
1 January, 2005 by Philip Leat
The process of terrane accretion is vital to the understanding of the formation of continental crust. Accretionary orogens affect over half of the globe and have a distinctively different evolution…Read more on Terrane processes at the margins of Gondwana: introduction
1 January, 2005 by Philip Leat
A review of evidence for deformation and terrane accretion on the Late Triassic–Early Jurassic margins of Pangea and the mid-Cretaceous margins of the palaeo-Pacific ocean shows that deformation was global…1 January, 2005 by David Vaughan
No abstract available for this article.Read more on How does the Antarctic ice sheet affect sea level rise?
1 January, 2005 by Dominic Hodgson
We present a relative sea-level (RSL) history, constrained by AMS radiocarbon-dated marine–freshwater transitions in isolation basins from a site adjacent to the Lambert Glacier, East Antarctica. The RSL data suggest…1 January, 2005 by Dominic Hodgson
Late Holocene changes in the ultraviolet radiation (UVR) penetration in a lake in the Larsemann Hills (East Antarctica) were reconstructed using sediment core proxies based on fossil pigments (scytonemins and…1 January, 2005 by David Barnes
Mass mortality of echinoids is well documented, and has potentially profound effects on benthic communities. However, no study to date has quantitatively investigated how regular, predictable events such as winter…1 January, 2005 by Mark Clilverd
We have studied the short-term effect of the October–November 2003 series of solar proton events on the middle atmosphere. Using the proton flux measurements from the GOES–11 satellite as input,…1 January, 2005 by Roger Worland
Raman spectra have been obtained for extremophiles from several geological environments; selected examples have been taken from hot and cold deserts comprising psychrophiles, thermophiles and halophiles. The purpose of this…1 January, 2005
Historical perspectives have shown how several scientific disciplines have developed their Antarctic component over the last century. Antarctic science has changed from a secondary activity of privately organised expeditions by…Read more on Antarctica and the global jigsaw – a centennial perspective
1 January, 2005
We are embarked on a decade of celebrations of the national expeditions of what is now termed the Heroic Age. Exploring the Antarctic – the great unknown continent – a…Read more on Exploring Antarctica – a centennial perspective. (Editorial).
1 January, 2005
The joint inspection report by Australia, Peru and the United Kingdom, presented at the last ATCM in Stockholm, contained an unusual recommendation. On the basis of the science that they…1 January, 2005
Recently hearing Fred Singer from the USA lecture on what he perceives to be the uncritical ways in which global change has been attributed to anthropogenic effects reminded me of…1 January, 2005 by Claire Waluda, Paul Rodhouse
Dosidicus gigas (the Jumbo flying squid) supports a major fishery in the Eastern Pacific. The commercial fishery consists of a multinational jigging fleet, and the emission of light from these…1 January, 2005 by Jonathan Watkins, Michael Meredith, Peter Ward
During Austral summer 2001/02 the spatial distribution of phytoplankton and zooplankton communities and associated production processes were investigated in waters to the north of the island of South Georgia. Nearest…1 January, 2005 by Mervyn Freeman
Mandelbrot introduced the concept of fractals to describe the non-Euclidean shape of many aspects of the natural world. In the time series context, he proposed the use of fractional Brownian…1 January, 2005 by David Barnes
Deployment of processed natural substrata is a common method of investigating early settlement and recruitment processes, but has been under-utilised as a multi-depth method for barnacle study and analysis. Replicate,…1 January, 2005
The Jurassic Latady Basin (southern Antarctic Peninsula) developed in a broad rift zone associated with the early stages of Gondwana extension. Early Jurassic sedimentation (~185 Ma) occurred in small, isolated…1 January, 2005 by Claus-Dieter Hillenbrand
Sea surface temperature (SST) estimates using the δ18O composition of fossil planktonic foraminifer calcite, within the time slice 3.12 to 3.05 Ma (Pliocene, Kaena Subchron – C2An1r) are assessed for…1 January, 2005 by Claus-Dieter Hillenbrand
This study examines the efficacy of published δ18O data from the calcite of Late Miocene surface dwelling planktonic foraminifer shells, for sea surface temperature estimates for the pre-Quaternary. The data…1 January, 2005
The Ballagan Formation (Late Tournaisian–Early Viséan) of central Scotland yields an ostracod fauna of 14 species in ten genera, namely Beyrichiopsis, Cavellina, Glyptolichvinella, Glyptopleura, Knoxiella, Paraparchites, Sansabella, Shemonaella, Silenites and…1 January, 2005
The study of biological systems has been revolutionized by the use of genomic technologies. Most of the knowledge gathered over the last few years refers to terrestrial models. The study…1 January, 2005 by Dominic Hodgson
Atmospheric pressure chemical ionisation liquid chromatography/multistage mass spectrometry (APCI-LC/MSn) provides a rapid, on-line method for the assignment of individual bacteriophaeophorbide c and d methyl esters (BPMEs) in complex mixtures. The…1 January, 2005 by Eric Wolff
The models and concepts used to predict future climate are based on physical laws and information obtained from observations of the past. New paleoclimate records are crucial for a test…Read more on Modeling past atmospheric CO2: results of a challenge
1 January, 2005 by Eric Wolff
Studying ice chemistry may not sound very exciting - after all, isn't ice just frozen water? Almost true, but glaciers and ice sheets, along with snow, contain traces of everything…1 January, 2005 by Eric Wolff
Antarctic ice cores have become a unique and powerful resource for studies of climate change. They contain information on past climate, on forcing factors such as greenhouse gas concentrations, and…Read more on Understanding the past – climate history from Antarctica
1 January, 2005 by Eric Wolff, Robert Mulvaney
Replicate ice cores have been drilled about 10 m apart for the top 790 m of the ice sheet at Dome C, Antarctica. This provides an opportunity to examine inter-core…1 January, 2005 by Roger Worland
Effects of 12 biotic and abiotic factors on the freezing point of the sub-Antarctic springtail, Tullbergia antarctica, were investigated. Repeated cooling of individual springtails five times resulted in very similar…Read more on Factors that influence freezing in the sub-Antarctic springtail Tullbergia antarctica
1 January, 2005
Albatrosses and petrels (Procellariiformes) are a group of pelagic seabird species that exhibit a wide range in body mass and some degree of sexual dimorphism (Warham 1990; Croxall 1995). Within…1 January, 2005
The method of collecting and analyzing boluses to characterize the cephalopod diet of albatrosses has been used in many diet studies. However, no study has validated this method. We compared…1 January, 2005 by John King
A non-hydrostatic numerical model, the Regional Atmospheric Modeling System (RAMS), has been used to investigate the development of katabatic jumps in Coats Land, Antarctica. In the control run with a…Read more on Numerical simulations of katabatic jumps in coats land, Antartica
1 January, 2005
The Kyffhäuser Crystalline Complex, Central Germany, forms part of the Mid-German Crystalline Rise, which is assumed to represent the Variscan collision zone between the East Avalonian terrane and the Armorican…1 December, 2004 by Mark Clilverd
In this study we consider the dependence of precipitation fluxes arising from whistler-induced radiation belt losses on the strength of the associated lightning's return stroke current. As a result of…Read more on Radiation belt electron precipitation fluxes associated with lightning
3 November, 2004 by Mark Clilverd
It has been suggested that whistler-induced electron precipitation (WEP) may be the most significant inner radiation belt loss process for some electron energy ranges. One area of uncertainty lies in…Read more on Investigating radiation belt losses though numerical modelling of precipitating fluxes
1 August, 2004 by Howard Roscoe
Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public…1 July, 2004 by Martin Collins
Recent trawling in the Southern Ocean has yielded an unusual and relatively large collection of deep-sea octopods, comprising four species in two genera. Several deep-sea genera, which are inadequately characterised,…Read more on Thaumelodone and other deep water octopodids from the Southern Ocean
14 June, 2004
An extensive variety of instruments, including Geotail, DMSP F11, SuperDARN, and IMP-8, were monitoring the dayside magnetosphere and ionosphere between 14:00 and 18:00 UT on 18 January 1999. The location…8 April, 2004 by Mark Clilverd
PMSE or Polar Mesosphere Summer Echoes are a well-known phenomenon in the summer northern polar regions, in which anomalous VHF/UHF radar echoes are returned from heights similar to85 km. Noctilucent…Read more on The impact of PMSE and NLC particles on VLF propagation
2 April, 2004 by Gareth Chisham, Mervyn Freeman
Latitudinal transitions from low to high Doppler spectral width in backscatter measured by the Super Dual Auroral Radar Network (SuperDARN) are now routinely used as proxies for the polar cap…1 April, 2004 by Mark Belchier
During January 2003 the bathymetric distribution of the cephalopod fauna of the South Georgia and Shag Rocks slope (100-900 m) was investigated using a commercial bottom trawl. Forty-four trawl stations…1 April, 2004 by Eric Wolff
High-resolution chemistry analysis and electrical measurements performed on two ice core records (European Project for Ice Coring in Antarctica (EPICA) Dome C and Vostok) spanning the last 45 kyr allow…1 January, 2004 by David Vaughan, Richard Hindmarsh, Richard Hindmarsh
Recent unexpected changes in the Antarctic Ice Sheet, including ice sheet thinning, ice shelf collapse and changes in ice velocities, along with the recent realization that as much as one…1 January, 2004
[1] We examine 22 case studies of CRRES satellite observations of substorm-enhanced whistler-mode waves. These observations were made close to the geomagnetic equator and between 0200 and 0600 MLT. The…1 January, 2004 by Vsevolod Afanasyev
The device has a sensor that periodically measures and records the ambient light level. Following retrieval of the device, the light level records are converted into latitudes and longitudes, which…1 January, 2004 by Richard Hindmarsh, Richard Hindmarsh
The late Holocene retreat of the West Antarctic ice sheet is crucial information for assessing its current dynamics. However, data from this period for parts of the ice sheet where…1 January, 2004
The diet of grey-headed albatrosses at Diego Ramirez was analysed and compared to that of the sympatric black-browed albatross. Diet composition was inferred from an analysis of prey hard parts…1 January, 2004 by Fausto Ferraccioli
A Geomagnetic Depth Sounding profile was performed across the glaciated Rennick Graben and the adjacent fault-bounded terranes of northern Victoria Land in East Antarctica. Induction arrows analysis and a 2D…1 January, 2004 by Andrew Clarke
Zooplankton growth rates are hard to measure directly, and proxy measurements are desirable to encompass the variety of species and scales of interest. The growth rate hypothesis of stoichiometric theory…1 January, 2004
Antarctic krill ( Euphausia superba) and salps ( mainly Salpa thompsoni) are major grazers in the Southern Ocean(1-4), and krill support commercial fisheries(5). Their density distributions(1,3,4,6) have been described in…Read more on Long-term decline in krill stock and increase in salps within the Southern Ocean
1 January, 2004 by Eric Wolff, Robert Mulvaney
The Antarctic Vostok ice core provided compelling evidence of the nature of climate, and of climate feedbacks, over the past 420,000 years. Marine records suggest that the amplitude of climate…Read more on Eight glacial cycles from an Antarctic ice core