Found 14089 items
1 March, 2003
Newly acquired aeromagnetic data indicate the presence of a dike swarm that may have acted as a magma transport and feeder system from the plume impact site up to 3,500…1 March, 2003
By combining reconstruction of airmass back-trajectories from dust deposition sites in Europe and measurements of the (Nd) isotopic composition of deposited dust particles, potential sources of different Saharan dust events…Read more on Case study of a Chinese dust plume reaching the French Alps
1 January, 2003 by Peter Convey
The Antarctic Peninsula region represents our best natural laboratory to investigate how earth's major climate systems interact and how such systems respond to rapid regional warming. The scale of environmental…Read more on Antarctic Peninsula climate variability: historical and paleoenvironmental perspectives
1 January, 2003 by Hilmar Gudmundsson
A non-linear regression model describing the mass-balance distribution of the whole Vatnajokull ice cap, Iceland, for the years 1992-2000 is presented. All available data from some 40 locations over this…1 January, 2003 by Paul Rodhouse
The syntypes of the endemic Southern Ocean octopodid Pareledone polymorpha (Robson, 1930) were re-examined and measurements, counts and indices are presented. The two forms described by Robson, namely oblonga and…Read more on Adelieledone, a new genus of octopodid from the Southern Ocean
1 January, 2003
Co-located high resolution profiles of acoustic backscatter, wind vector and potential temperature are presented, measured within the stable atmospheric boundary layer over an Antarctic ice shelf. Acoustic profiles from a…1 January, 2003
The diet of black-browed albatrosses was studied at Gonzalo Island, Diego Ramirez, Chile, during the early chick-rearing periods of 2000, 2001, and 2002. Diet composition was determined by sampling chick-stomach…Read more on The diet of black-browed albatrosses at the Diego Ramirez Islands, Chile
1 January, 2003 by Kevin Hughes, Peter Convey, Rod Arnold
Over 15 months between January 1990 and March 1991, a range of physical, chemical and biological parameters was monitored regularly in fellfield soils of frost-sorted polygons at four sites on…1 January, 2003 by Robert Arthern
We describe a new approach for estimating changes in ice sheet mass. Two methods are in common use: the ice budget and geodetic methods. The first makes use of separate…Read more on Optimal estimation of changes in the mass of ice sheets
1 January, 2003
The response of rhizosphere microbial communities associated with natural populations of Deschampsia antarctica growing on Leonie Island (67degrees36'S, 68degrees21'W, Antarctic Peninsula) to UV radiation was investigated. UV radiation was controlled…1 January, 2003 by Martin Collins
The few existing measurements of deep-sea fish physiology consistently indicate reduced basal metabolism and metabolic power. A possible explanation for this is the reduction in selective pressure for burst activity…1 January, 2003 by Lloyd Peck
In vivo P-31-nuclear magnetic resonance (NMR) spectroscopy was used to measure the levels of ATP, phospho-L-arginine (PLA), and inorganic phosphate in the adductor muscle of the Antarctic scallop Adamussium colbecki…1 January, 2003
[1] The International Photolysis Frequency Measurement and Model Intercomparison (IPMMI) took place in Boulder, Colorado, from 15 to 19 June 1998, aiming to investigate the level of accuracy of photolysis…1 January, 2003 by David Barnes
Many mobile animals migrate because of the different benefits provided by different localities in time and space. For hermit crabs, such benefits include resource (shell, water, food) acquisition and gamete…Read more on Ecology of subtropical hermit crabs in SW Madagascar: short-range migrations
1 January, 2003 by David Barnes
Most organisms experience competition for resources, probably most of the time. As the structure and requirements of closely related species are generally liable to be more similar than in distantly…1 January, 2003 by David Barnes
To see the 'big pictures', it seems increasingly clear that experimental design, data collection and analyses of ecological investigation need to be at multiple scales. This causes problems with data…1 January, 2003 by David Barnes
The waters surrounding Antarctica are amongst the most isolated large areas of continental shelf, cut off for about 15 to 30 million yr by both deep water and the oceanographic…Read more on Zoobenthic biodiversity, biomass and abundance at Adelaide Island, Antarctica
1 January, 2003 by David Barnes
In just 4 decades, marine litter has become abundant in northern oceans and seas and is increasing on even remote Southern Ocean island shores. The Southern Ocean was thought to…Read more on Rafting by five phyla on man-made flotsam in the Southern Ocean
1 January, 2003 by David Barnes
On polar shores, as at lower latitude, intense battles for space ensue on boulders but the high wind, wave and ice disturbance make the colonisation race a short one in…Read more on High polar spatial competition: extreme hierarchies at extreme latitude
1 January, 2003 by Eric Wolff
[1] Interpretation of the chemical layers measured in ice cores requires knowledge of processes occurring after their deposition on the ice sheet. We present evidence for the diffusion of soluble…Read more on Evolution of chemical peak shapes in the Dome C, Antarctica, ice core
1 January, 2003
Ridges have been observed at the bonds between sintering snow grains. Images collected using the scanning electron microscope (SEM) and x-ray analysis of Antarctic snow are presented. These indicate the…1 January, 2003 by Eric Wolff
Determining the microphysical location of impurities in natural ice from the polar regions is necessary for understanding the physical properties of ice and for assuring the integrity of ice core…Read more on SEM studies of the morphology and chemistry of polar ice
1 January, 2003 by Hilmar Gudmundsson
Results from 15 years of work on glacier-bed mapping by radio-echo soundings on Finsteraar-, Lauteraar- and Unteraargletscher, Switzerland, are summarized, and a new and greatly improved map of the ice-thickness…Read more on The ice-thickness distribution of Unteraargletscher, Switzerland
1 January, 2003 by David Barnes
Extensive sponge assemblages are found in a number of habitats at Lough Hyne Marine Nature Reserve. These habitats are unusual in experiencing a range of environmental conditions, even though they…Read more on Effect of disturbance on assemblages: an example using Porifera
1 January, 2003
Halley the 50-year-old Antarctic survey station where the hole in the ozone layer was discovered, is by necessity in one of the most inhospitable parts of the earth. Its resident…1 January, 2003 by William Block
The ecophysiology of cold tolerance in many terrestrial invertebrate animals is based on water and its activity at low temperatures, affecting cell, tissue and whole organism functions. The normal body…Read more on Water or ice? – the challenge for invertebrate cold survival
1 January, 2003 by William Block
Encapsulation and dehydration techniques using alginate beads are used increasingly for the pre-treatment of various plant materials for cryopreservation to improve survival post-cryogenic storage. This study reports the effects of…1 January, 2003 by William Block
Ceratophysella sigillata (Collembola, Hypogastruridae) has a life cycle which may extend for >2 years in a temperate climate. It exists in two main morphs, a winter-active morph and a summer-dormant…1 January, 2003
Mineralogical and isotopic composition (Sr and Nd) of six dust samples, obtained from six widely spread ice-coring sites in Greenland, were analyzed in order to investigate the regional geographic variability…Read more on Regional variability of ice core dust composition and provenance in Greenland
1 January, 2003 by Eugene Murphy
We investigate systematically the effect of small-scale biological and physical processes on the generation of plankton patchiness, and on the biological production averaged over scales much larger than those of…Read more on Plankton patchiness and its effect on larger-scale productivity
1 January, 2003
The autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northern Weddell Sea and in the Bransfield Strait, Southern Ocean, to…1 January, 2003 by Andrew Clarke
In teleosts, the proliferation of myogenic progenitor cells is required for muscle growth and nuclear turnover. We measured the cell cycle and S-phase duration of myogenic cells in the fast…1 January, 2003 by Gareth Chisham, Mervyn Freeman
Accurately measuring the location and motion of the polar cap boundary (PCB) in the high-latitude ionosphere can be crucial for studies concerned with the dynamics of the polar cap, e.g.…1 January, 2003 by Andrew Clarke
Temperature affects everything that an organism does. Although we have an increasingly sophisticated understanding of evolutionary adaptation to temperature at the molecular level for some cellular processes, we still know…Read more on Costs and consequences of evolutionary temperature adaptation
1 January, 2003 by Andrew Clarke
This review of polar marine ecosystems covers both the Arctic and Antarctic, identifying the major threats and, where possible, predicting their possible state(s) in 2025. Although the two polar regions…Read more on Polar marine ecosystems: major threats and future change
1 January, 2003 by Mervyn Freeman
We discuss how the ideal formalism of computational mechanics can be adapted to apply to a noninfinite series of corrupted and correlated data, that is typical of most observed natural…1 January, 2003 by Mark Clilverd, Michael Rose
[1] Two independent ground-based experiments and two satellite-borne experiments are used to interpret the changes in plasmaspheric composition at the same point in space during moderate geomagnetic activity on 22…Read more on In situ and ground-based intercalibration measurements of plasma density at L = 2.5
1 January, 2003 by Mark Clilverd
[1] The longest data sets available for estimating thermospheric temperature trends are those from ground-based ionosondes, which often begin during the International Geophysical Year of 1957, close to a solar…Read more on Residual solar cycle influence on trends in ionospheric F2-layer peak height
1 January, 2003 by Mark Clilverd
We consider the likely levels of solar activity in 2100 by analysing the previous history of long-term solar and geomagnetic activity indices. We make use of superposed periods of similar…1 January, 2003
Biological dosimeters made from a monolayer of Bacillus subtilis spores were used to investigate the penetration of ultraviolet radiation into some widespread terrestrial microbial microhabitats at polar latitudes: at Mars…1 January, 2003
The establishment of a permanent human scientific presence at the Martian poles requires the identification of a strategy for growth, from localized field parties to a permanent polar infrastructure. Using…1 January, 2003
We examined the environmental stresses experienced by cyanobacteria living in endolithic gneissic habitats in the Haughton impact structure, Devon Island, Canadian High Arctic (75° N) and compared them with the…Read more on Polar endoliths – an anti-correlation of climatic extremes and microbial diversity
1 January, 2003
Impact structures are a rare habitat on Earth. However, where they do occur they can potentially have an important influence on the local ecology. Some of the types of habitat…Read more on The impact crater as a habitat: effects of impact processing of target materials
1 January, 2003 by Mark Belchier
1 January, 2003 by Martin Collins
The systematics and distribution of the cirrate octopod genus Grimpoteuthis in the north-east Atlantic are reviewed. Three new species are described and Grimpoteuthis wuelkeri (Grimpe, 1920) is redescribed. A new…1 January, 2003
[1] During the period 1968-1999, the character of circum-Antarctic anomalies in sea level pressure, sea ice edge, and sea surface temperature changed substantially. An Antarctic Circumpolar Wave (ACW) is only…Read more on Long-term variation of the Antarctic Circumpolar Wave
1 January, 2003 by Peter Convey
The simplicity of maritime Antarctic terrestrial ecosystems, combined with rapid changes in several environmental variables, creates a natural laboratory probably unparalleled worldwide in which to study biological consequences of climate…Read more on Maritime Antarctic climate change: signals from terrestrial biology
1 January, 2003 by Helen Peat, Peter Convey, William Block
Abiotic features of Antarctic terrestrial habitats, particularly low temperatures and limited availability of liquid water, strongly influence the ecophysiology and life histories of resident biota. However, while temperature regimes of…Read more on Soil arthropods as indicators of water stress in Antarctic terrestrial habitats?
1 January, 2003 by Peter Fretwell
Placenames in Antarctica are uniquely complex. Antarctica’s distinctive political environment results in a situation where many national bodies confer names, but until recently there has been no coordination of this…1 January, 2003 by Anna Jones, Eric Wolff
[1] Laboratory experiments were conducted to determine the wavelength and temperature dependence of NO and NO2 release from Antarctic snow. This photochemically driven process has been observed during recent field…1 January, 2003 by Peter Convey
Over 300 species of insect (including Collembola) are recorded from Svalbard. These include 11 species of Lepidoptera, the majority of which are occasional summer immigrants (Coulson and Refseth 2003). Those…Read more on A high-Arctic population of Pyla fusca (Lepidoptera, Pyralidae) on Svalbard?
1 January, 2003
[1] The baroclinic transport of the Antarctic Circumpolar Current (ACC) above 3000 m through Drake Passage is 107.3 +/- 10.4 Sv and has been steady between 1975 and 2000. For…Read more on Transport and variability of the Antarctic Circumpolar Current in Drake Passage
1 January, 2003
The Neptune Range of the Pensacola Mountains, East Antarctica, exposes a record of Early Palaeozoic to Early Mesozoic polyphase deformation along the former East Antarctic margin of Gondwana that is…1 January, 2003 by Teal Riley
Large mafic sills in the Ahlmannryggen region of western Dronning Maud Land were intruded into partially lithified sediments of the mid-Proterozoic Ritscherflya Supergroup. Clastic sedimentary dykes intruding the thick mafic…1 January, 2003 by Richard Phillips
Recent taxonomic revisions of the Wandering Albatross sensu lato has resulted in four separate species, the rarest of which is the Tristan Albatross (Diomedea dabbenena). We present the first detailed…1 January, 2003 by Adrian Jenkins, Hugh Corr, Keith Nicholls
We have collected polarimetric ice sounding radar data on Brunt, George VI and Ronne ice shelves using a vector network analyser as a continuous wave step-frequency radar. Being a wideband…1 January, 2003
Specimens of a late Bajocian to early Callovian isocrinid assigned to Pentacrinites cf. P. californicus (Clark), and specimens collected by Hikuroa in 1999–2000, are described as a new species of…1 January, 2003
Lichens in Antarctic habitats are subjected to environmental extremes, including UVB radiation, desiccation and low temperatures, as well as to rapid fluctuations in these. Lichens synthesise a variety of chemical…1 January, 2003 by Dominic Hodgson
The Fourier transform-Raman spectra of two lacustrine sediment cores from Antarctic sites are reported. The Lake Hoare specimens were predominantly calcium carbonate, quartz and β-carotene, with chlorophyll and calcium sulphate…1 January, 2003
Project Leader, Antarctic Astrobiology, British Antarctic Survey, Cambridge 1946–2002 David Donaldson Wynn-Williams, born 16th July, 1946, in West Kirby, Cheshire, UK and Founding Editor of the International Journal of Astrobiology,…Read more on Guest editorial to special issue dedicated to David D. Wynn-Williams
1 January, 2003
The vital UV-protective and photosynthetic pigments of cyanobacteria and lichens (microbial symbioses) that dominate primary production in Antarctic desert ecosystems auto-fluoresce at short-wavelengths. A long wavelength (1064 nm) near infra-red…1 January, 2003
The FT-Raman and infrared vibrational spectra of some important lichen compounds from two metabolic pathways are characterised. Key biomolecular marker bands have been suggested for the spectroscopic identification of atranorin,…1 January, 2003
The Raman and infrared spectra of the UV-radiation protectant parietin extracted from Xanthorialichen species are reported and vibrational assignments made of key features which are important for the characterisation of…Read more on Molecular spectroscopic studies of lichen substances 1: parietin and emodin
1 January, 2003
The vital ultraviolet- (UV-) protective and photosynthetic pigments of cyanobacteria and lichens (microbial symbioses) that dominate primary production in Antarctic desert ecosystems auto-fluoresce at short wavelengths. We therefore use a…1 January, 2003
In this paper, in this edition of the Journal commemorating the life and work of David Wynn-Williams, we consider approaches to the astrobiological investigation of Mars. We provide a brief…Read more on Astrobiological instrumentation for Mars – the only way is down
1 January, 2003
In Part 1 of this paper, we presented a phased approach to the development of a Mars pole human-inhabited research station modelled on those in the terrestrial polar regions. To…Read more on The human exploration of the Martian poles Part 2 – support technologies
1 January, 2003
We provide a scientific rationale for the astrobiological investigation of Mars. We suggest that, given practical constraints, the most promising locations for the search for former life on Mars are…Read more on Why Raman spectroscopy on Mars? – a case of the right tool for the right job
1 January, 2003
Semi-continuous, linear accumulations of poorly-sorted debris are present on the surface of the remnant Larsen-A Ice Shelf, Antarctic Peninsula. These accumulations form a complex of debris bands extending parallel to…Read more on Supraglacial debris along the front of the Larsen-A Ice Shelf, Antarctic Peninsula
1 January, 2003 by Mervyn Freeman
An extraordinary powering of the magnetosphere by the solar wind occurred in a 3-hour burst early on May 4 when the IMF was very intense and pointed south (≈-35 nT;…1 January, 2003 by Mervyn Freeman
We study large-scale magnetospheric disturbances elicited by the May4, 1998 high speed stream by modeling the Dst and studying records from 4 meridional magnetometer chains covering key local time sectors.…1 January, 2003 by David Pearce
The polar desert is one of the most extreme environments on Earth. Endolithic organisms can escape or mitigate the hazards of the polar desert by using the resources available in…1 January, 2003 by Robert Larter
The Antarctic Climate Evolution (ACE) project is a new international research initiative to study the climate and glacial history of Antarctica by linking climate and ice sheet modeling studies with…Read more on Antarctic Climate Evolution (ACE) Research Initiative
1 January, 2003 by Mervyn Freeman
Two competing paradigms of the response of ionospheric convection to changes in the interplanetary magnetic field are synthesized into the common framework of the expanding-contracting polar cap (ECPC) model in…1 January, 2003
Bransfield Strait, a narrow active rift with three submarine basins, separates the South Shetland Islands from northern Antarctic Peninsula. Volcanism in Bransfield Strait commenced prior to 0.75 Ma and continues,…