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Sub-ice shelf bathymetry remains a poorly known but important boundary condition for … models of sub-ice shelf circulation and the distribution of basal melt and accretion. Surfacebased … seismic surveys are traditionally used to determine sub-ice shelf bathymetry…
Polar stratospheric gravity wave activity is studied using data from the Constellation … Observing System for Meteorology, Ionosphere and Climate (COSMIC) Global … Positioning System Radio Occultation (GPS-RO). Waves with vertical wavelengths of … 2 to 15 km are considered.
Mid-latitude Digisonde Doppler velocities, auroral electrojet (AE) indices and cloud-to-ground (CG) lightning strokes during August 2003–2004 were used to study the perturbations in the F-region … vertical drift associated with terrestrial thunderstorms. A superposed epoch analysis (SEA)…
ABSTRACT. The loss of methanesulphonic acid (MSA) from stored ice cores can be significant over … typical storage times, with diffusion to the ice-core surface controlling the loss.
Lead (Pb) isotope ratios were measured in the marine macroalga Iridaea cordata collected from four locations … in the Windmill Islands, East Antarctica. Based on the masses of thalli collected, samples analysed in … this study were likely to be a mixture of one and two year old thalli.
Measurements of the microwave backscatter from the Antarctic ice sheet have been obtained by the single-sided, right-looking, C-band wind scatterometer carried by the ERS-1 and 2 satellites and by the dual-sided, ku-band NSCAT instrument on ADEOS.
Microwave backscatter from the Antarctic snow cover depends on the surface roughness, properties and structure within the snow cover, and moisture content. Small increases in moisture content produce a significant reduction in backscatter.
1. Owing to the detrimental impacts of invasive alien species, their control is often a priority for … conservation management. Whereas the potential for unforeseen consequences of management is … recognized, their associated complexity and costs are less widely appreciated. 2.
When resources are limited or patchy, a species may develop some degree of resource … partitioning to reduce intra-specific competition. Development of intra-specific resource partitioning … is more pronounced in species with clear phenotypic variation among individuals (e.g. age or sex).
Understanding the cryptic lives of wide–ranging wild animals such as seals can be challenging, but with the … advent of miniaturised telemetry and data–logging devices this is now possible and relatively straightforward. However…
Recently, Vergani et al. (2008) examined the … climatic drivers of population dynamics … (weaning mass) and foraging performance … (diet variation) from southern elephant … seals, Mirounga leonina, in the Atlantic sector … of the Southern Ocean.
We investigate using relative amounts of … prey DNA recovered from pinniped faeces to obtain … diet composition data. Faeces were obtained from … captive sea lions being fed a diet containing three fish … species (50%, 36% and 14% by mass).
Ozone hole over Antarctica exists almost three decades each austral spring.
The zonal anomalies data in total ozone and thermal tropopause height … shows that ozone depletion during austral spring has a strong influence on … the height and sharpness of the tropopause over West Antarctica.
The mantis shrimps (Stomatopoda) are quintessential marine predators. The combination of powerful raptorial appendages … and remarkably developed sensory systems place the stomatopods among the most effi cient invertebrate predators.
Whale sharks (Rhincodon typus) are thought to aggregate in nearshore waters around Christmas Island … (105◦37E, 10◦29S) to consume the marine larvae of the endemic red land crab (Gecarcoidea natalis). However, there … have been no direct observations of sharks feeding on crab larvae.
We report here the finding of a new plant virus, Stilbocarpa mosaic bacilliform badnavirus (SMBV) in Stilbocarpa polaris (Homb. et Jacq.) Gray on subantarctic Macquarie Island. This is the first vascular plant virus reported from any of the remote subantarctic islands…
The Network for the Detection of Mesopause Change (NDMC) is a global program with the mission to promote … international cooperation among research groups investigating the mesopause region (80-100 km) with the goal of … early identification of changing climate signals.
Accurate measurement of fundamental parameters, such as temperature, density and composition, through the whole atmosphere and over long time scales is vitally important to identify and quantify changes in the earths climate, whether natural or anthropogenic.
Over a decade of site testing in Antarctica has shown that both South Pole and Dome C are exceptional sites for … astronomy, with certain atmospheric conditions superior to those at existing mid-latitude sites. However, the highest … point on the Antarctic plateau, Dome A…
Assessments of nutrient-limitation in microalgae … using chl a fluorescence have revealed that nitrogen … and phosphorus depletion can be detected as a … change in chl a fluorescence signal when nutrientstarved … algae are resupplied with the limiting nutrient.
The temporal evolution of the subauroral polarization stream (SAPS) is investigated … using the Doppler velocity observations by the Unwin HF radar in conjunction with … the simultaneously observed auroral luminosity and plasma convection reversal regions. The event under study of 14 December 2004…
The dual Tasman International Geospace Environment … Radar (TIGER) HF radars regularly observe E-region … echoes at sub-auroral magnetic latitudes 58–60 S including … during geomagnetic storms. We present a statistical analysis … of E-region backscatter observed in a period of 2 years …
We present a statistical analysis of short-range E region echoes observed by the Super … Dual Auroral Radar Network (SuperDARN) HF radars in the evening sector (16–22 … MLT) over 3 years. Significant populations of the high-velocity (350–450 m/s)…
The positive and negative effects engendered by Antarctic employment have been well-documented within expeditioner populations. However, research to date has primarily focused on individual and organisational factors that influence these outcomes.