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The isotopes of nitrate, which show different dynamics than nitrate concentration during physical transport and nitrate assimilation, provide a complementary constraint in the effort to understand nutrient transport and biogeochemical fluxes in the Southern Ocean. For instance…
Roughly equal amounts of dense water sink in the high latitudes of both hemispheres to … ventilate the deep oceans and supply the lower limb of the global thermohaline (or … overturning) circulation.
Detection of long-term climate change requires knowledge of natural variability in the oceanatmosphere … system. In the Southern Hemisphere, climate variability is evident on time-scales … of days to centuries, yet we know relatively little about how this forces interior ocean … fluctuations…
Surface carbon dioxide (CO2) observations are integral to understanding the role of the … Southern Ocean in the global carbon cycle, and to developing reliable predictions of … biogeochemical responses to altered climatic conditions. Carbon dioxide (CO2)…
The oxygen isotopic record obtained from Globigerina bulloides, Globorotalia inflata, and Neogloboquadrina pachyderma … (s.) was analysed for 5 sediment traps moored in the Southern Ocean and Southwest Pacific. The traps extend from Subtropical … to the Polar Frontal environments…
Southern elephant seals (Mirounga leonina) are a major consumer of biomass in the … Southern Ocean with a global distribution.
Many studies have shown that for plants growing in alpine and high latitude environments … sexual reproduction is not an important life history trait. This study investigated reproductive … ecology of the vascular flora of Macquarie Island…
Researchers in the SCAR- RiSCC program have been examining the interactions among … climate change, indigenous and alien species, and species and ecosystems function in … terrestrial and limnetic environments spanning an Antarctic environmental gradient of 30° … latitude. This international…
For the first time, the cyanobacterial diversity from microbial mats in lakes of … Eastern Antarctica was investigated using microscopic and molecular approaches. The present study assessed the biogeographical distribution of cyanobacteria in … Antarctica.
1. Microbial plankton dynamics in an ultra-oligotrophic epishelf lake (Beaver Lake, Antarctica) were investigated over an austral summer (December 2002 to January 2003). The aim was to characterise carbon cycling in an environmentally extreme lake. 2.
Oversnow traverses have collected a variety of glaciological measurements around the interior drainage basin of the Lambert Glacier, East Antarctica (longitudes 54°-78°E, latitudes 67°-76°S), between 1989-90 and 1994-95.
The application of renewable power systems is particularly relevant to remote locations such as Antarctic stations, where traditional fossil fuel based systems incur relatively high costs of fuel transportation, in conjunction with an increased risk of environmental damage.
INTRODUCTION … The earliest Australian tide gauge to be operated in Antarctica was in 1912 when a gauge was installed at Cape Denison, George V Land, for 3 months during the Australasian Antarctic Expedition.
The amplitude and phase of the semidiurnal tide in the mesosphere and … lower thermosphere above Davis varies through the summer months. In particular, the phase can oscillate around a fixed value or, at some heights, shift by a whole cycle of local time.
Variations in the atmospheric, near-surface vertical electric field measured at the Southern … near-pole station Vostok (78.5(S, 107(E, L=75.0) in 1998, 1999 and 2000 have been analyzed … in conjunction with changes of the ionospheric electric field and interplanetary magnetic field … (IMF).
A common technique for comparing the in situ microbial potential for mineralisation of petroleum hydrocarbons in different environments or under different remediation strategies, is by use of radiolabelled tracer studies.
Around 145 different non-marine algae have been identified from the Windmill Islands region, Antarctica. About 24 of these occur in the snow. Nearly half of these, which includes all the dominant snow algae, complete their life cycles in the snow and do not grow elsewhere.
ABSTRACT … The first estimate of the flux of dimethylsulphide (DMS) from the Australian sector of the Southern Ocean from 63oE-162oE has been calculated from seven voyages, which span spring and summer seasons from 1991-1995. DMS flux from the Sub Antarctic Zone (SAZ), Antarctic Zone (AZ)…
Since the first lidar observation of polar mesospheric clouds (PMC) in 1989 by a Na lidar at Andoya, extensive PMC observations have been made by lidars in both the northern and southern hemispheres. The lidar observations provide precise information on PMC altitudes, layer structure…
Accurate assessments of the past and future mass budgets of polar ice sheets are essential to resolving contributions to past sea-level rise and projecting responses to climate change respectively. Both tasks require that ice accumulation and ice flow are each accurately described…
The long-term variation of the solar diurnal anisotropy of the galactic cosmic … ray intensity in the sub-TeV region is studied by using data recorded over … 20 years with the deep underground muon detector at Matsushiro in Japan … since 1984.