Latest publications
Results 3476 to 3500 of 13317
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.
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)…
SuperDARN radars are sensitive to the collective … Doppler characteristics of decametre-scale irregularities in … the high latitude ionosphere. The radars routinely observe … a distinct transition from large spectral width (>100ms−1) located at higher latitudes to low spectral width…
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.
The Antarctic environment poses both physical and … psychological challenges to human performance, particularly during the austral winter. Additionally, Antarctic employment involves prolonged separation … from existing social support networks.
It is generally accepted that surface freshwater … anomalies in the Southern Ocean drive increases in North … Atlantic Deep Water (NADW) formation via a bipolar … density see-saw. We find that a Southern Ocean freshwater … pulse of comparable magnitude to meltwater pulse 1A, shuts down…
The role played by Southern Hemisphere sea ice in the global climate system is explored using an earth … system climate model of intermediate complexity.
The natural variability of the Weddell Sea variety of Antarctic Bottom Water (AABW) is examined in … a long-term integration of a coupled climate model. Examination of passive tracer concentrations suggests … that the model AABW is predominantly sourced in the Weddell Sea.
Sea ice is a critical but poorly understood component of … Earth’s climate system. A rapid decline in Arctic sea ice over … recent decades has been documented using historical ship … charts and satellite images. However…
The Antarctic ice cap is a unique vantage point from which to … observe the global background of black carbon aerosol (BC). Far … removed from sources, BC in the Antarctic atmosphere is largely … due to biomass burning at low- to mid-latitudes modulated by … upper tropospheric…
Archived in glaciers and ice sheets are long term records … of dustiness. Dust impacts Earth’s radiative forcing directly by … modifying the radiation budget and affecting cloud nucleation … and optical properties, and indirectly through ocean … fertilization which alters carbon sequestration.
Bursty bulk flows are understood to be the predominant flux transport mechanism in the … magnetotail.
A magnetic cloud in the solar wind impinged the Earths magnetosphere on the 7th January … 2005. Episodic enhancements in the coupling of solar wind energy initiated a familiar sequence … of Geospace events including a succession of substorms of increasing intensity throughout the … day.
The solar wind, magnetosphere, and ionosphere form a vast multi-scale system.
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.
A statistical analysis of short-range E-region echoes observed by the SuperDARN HF radars in … the evening sector (16-22 MLT) over 3 years near the solar cycle peak is presented. Significant … populations of the high-velocity (350-450 m/s)…
The correct identification of ionospheric echoes and 'ground' or 'sea' echoes is important to a … wide variety of studies using SuperDARN radar data. FITACF correctly distinguishes the … majority of ionospheric and ground echoes…
AB: We investigate the storm-time E-region backscatter observed by the … Tasman International Geospace Environment Radar (TIGER) HF radars. In … the afternoon sector during the negative geomagnetic storm phase…
A new all-sky imaging Fabry-Perot spectrometer has been installed at … Mawson station (67°36' S, 62°52' E), Antarctica. This instrument is capable … of recording independent spectra from many tens of locations across the sky … simultaneously. Useful operation began in March 2007…
: SuperDARN (SuperDual Auroral Radar Network) provides multi-point … observations of ionospheric flows over both southern and northern … hemisphere auroral regions and similarly GPS TEC and tomography … observations provide images of structures in the ionosphere and … plasmasphere.
A simplified three dimensional, time-dependant model of a small region … of Earth's thermosphere is being developed to investigate dynamical … processes over spatial scales of less than 100 km. Because hydrostatic … equilibrium is not enforced in the model…