Showing 11923 items
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 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
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
1 January, 2004
The International Geophysical Year (1957–1958) was inspired by the realization that much better and more complete information was needed about the Earth and geospace to understandand manage the complete terrestrial…Read more on Moving beyond the IGY: the electronic Geophysical Year (eGY) concept
1 January, 2004 by David Barnes
Variability in interference competition was studied in benthic marine communities of the arctic and subarctic Atlantic intertidal and shallow subtidal zones. We sampled multiple square-metre quadrats at distances of 10(1).…1 January, 2004 by David Barnes
Finding evidence for climate change in the sea has been less easy than on land. As ice-loading of nearshore waters (through ice sheet collapses) seems a most likely signal of…Read more on Scale-dependent variation in competitive ability among encrusting Arctic species
1 January, 2004 by David Barnes
There is much concern about the potential for invasive species to enter the only marine region left with no known exotics - the Southern Ocean. Attention has focused on planktonic…1 January, 2004 by Eric Wolff
Understanding the microstructure of ice underpins the interpretation of ice-core measurements and many ice-sheet properties. A detailed study of polar snow and ice using scanning electron microscope (SEM) and X-ray…Read more on Distribution of soluble impurities in cold glacial ice
1 January, 2004 by Philip Trathan, Sally Thorpe
In January and February 2000, four ships conducted an extensive hydrographic survey of the Scotia Sea as part of the CCAMLR 2000 Survey. There were 169 CTD stations to at…1 January, 2004 by Roger Worland
A species of the fungus Neozygites (Zygomycetes: Entomophthorales) is recorded from the Antarctic mite Alaskozetes antarcticus (Acarina: Oribatidales) collected off the west coast of the Antarctic peninsula. The features of…Read more on First report of an entomophthoralean fungus on an arthropod host in Antarctica
1 January, 2004
We surveyed Antarctic krill (Euphausia superba) under sea ice using the autonomous underwater vehicle Autosub-2. Krill were concentrated within a band under ice between 1 and 13 kilometers south of…1 January, 2004 by David Barnes, Lloyd Peck
Ice is a major structuring force in marine and freshwater environments at high latitudes. Although recovery from scouring has been quantified in time, the frequency of scouring in the Antarctic…1 January, 2004
Global rates and patterns of fecundity in marine epipelagic copepods were studied as a function of temperature, body weight of the female and concentration of chlorophyll a. We divided data…1 January, 2004
A recent taxonomic revision of wandering albatross elevated each of the four subspecies to species. We used mitochondrial DNA and nine microsatellite markers to study the phylogenetic relationships of three…Read more on Global population structure and taxonomy of the wandering albatross species complex
1 January, 2004 by Geraint Tarling
Net and acoustic studies of diel vertical migration (DVM) in krill often show a degree of dispersion around the mean population depth, which becomes greater during night-time. Trade-off models can…1 January, 2004 by Melody Clark
Two principal groups of receptors orthologous with human PAC(1)R and VPAC(1)R and were identified and characterised at the genomic level in the teleost fish Fugu rubripes. An additional group orthologous…1 January, 2004 by Richard Phillips
A Gray-headed Albatross (Thalassarche chrysostoma) was recorded traveling, in the course of a foraging trip, at a minimum average ground speed of >110 km h(-1) for similar to9 h with…1 January, 2004 by Janet Silk, Richard Phillips
We identified a range of foraging strategies adopted by grey-headed albatrosses Thalassarche chrysostoma rearing chicks at Bird Island, South Georgia, by simultaneously using satellite telemetry, wet/dry activity recorders and stomach…1 January, 2004 by Lloyd Peck
Oxygen availability limits the maximum potential size attainable in benthic gammaridean amphipods from the suborder to the generic level, while also influencing size within species. In this paper we investigate…1 January, 2004
Plasma transport and energy dissipation in the driven dynamic magnetosphere are intermittent (bursty), and occur on a range of spatiotemporal scales. System observables such as geomagnetic indices, and auroral images,…Read more on Robustness and scaling: key observables in the complex dynamic magnetosphere
1 January, 2004 by Gareth Chisham, Mervyn Freeman
The boundary between quasi-dipolar (closed) geomagnetic field lines and those connected to the interplanetary magnetic field (open) is a key diagnostic for the magnetospheric system. This study presents an HF…1 January, 2004 by Gareth Chisham, Mervyn Freeman, Michael Pinnock
This study presents, for the first time, detailed spatiotemporal measurements of the reconnection electric field in the Northern Hemisphere ionosphere during an extended interval of northward interplanetary magnetic field. Global…1 January, 2004 by Mark Clilverd
Polar mesospheric clouds (PMC) were observed by an Fe Boltzmann temperature lidar at Rothera (67.5degreesS, 68.0degreesW), Antarctica in the austral summer of 2002-2003.The Rothera PMC are much weaker, less frequent,…1 January, 2004 by Andrew Clarke, Lloyd Peck, Melody Clark, Peter Convey
With the development of genomic science and its battery of technologies, polar biology stands on the threshold of a revolution, one that will enable the investigation of important questions of…1 January, 2004 by Andrew Clarke
In a challenging and provocative paper Gillooly et al. (2001) have proposed that the metabolism of all organisms can be described by a single equation, * Q = b0M3/4e−E/kT, where…Read more on Is there a Universal Temperature Dependence of metabolism?
1 January, 2004 by Andrew Clarke, Alistair Crame
The modern benthic fauna of the Antarctic continental shelf is characterized by the lack of active, skeleton-breaking (durophagous) predators such as crabs, lobsters and many fish, and the dominance in…Read more on Evolution and diversity of the benthic fauna of the Southern Ocean continental shelf
1 January, 2004 by Andrew Clarke
Annual shell growth was determined by mark and recapture in the limpet Nacella concinna (Strebel 1908) at two contrasting sites in Antarctica. At Signy Island, 60degreesS, growth was moderately fast,…Read more on Growth in the limpet Nacella concinna from contrasting sites in Antarctica
1 January, 2004
Impact-shocked gneiss shocked to greater than 10 GPa in the Haughton impact structure in the Canadian High Arctic has an approximately 25-times greater pore surface area than unshocked rocks. These…1 January, 2004
The increasing robotic exploration of Mars and eventual human exploration and settlement of that planet threatens to have a significant environmental impact on scientifically important sites and sites of natural…1 January, 2004
Over the last forty years, the circle of organisms thought worthy of inclusion within an ethical framework has expanded markedly, in large part in response to Aldo Leopold's 'land ethic'.…1 January, 2004
In this paper I explore potential relationships between humans and Martian polar ices. Martian ices contain within them multimillion year histories of atmospheric, geological and maybe even biological processes. Polar…1 January, 2004
During the spring, when ozone depletion at the polar regions is at its maximum and consequently the environmental UV exposure is potentially high, many terrestrial communities are covered in snow…1 January, 2004
Ultraviolet radiation is more damaging on the surface of Mars than on Earth because of the lack of an ozone shield. We investigated micro-habitats in which UV radiation could be…Read more on Zones of photosynthetic potential on Mars and the early Earth
1 January, 2004
High-latitude polar deserts are among the most extreme environments on Earth. Here we describe a large and previously unappreciated habitat for photosynthetic life under opaque rocks in the Arctic and…