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The high-spatial-resolution observations of the auroral … E-region echoes by the Super Dual Auroral Radar Network … (SuperDARN) HF radar at Pykkvibaer, Iceland considered … in a previous study are re-examined.
[1] For the first time, the temperature of mesospheric ice … particles is retrieved directly from ice infrared extinction … spectra measured in the solar occultation regime. The … position of ice O-H stretch band peak varies from … 3230cm1 at T = 120K to 3246cm1 at T = 155K…
We evaluate atmospheric ionization during the Ground Level Enhancement (GLE) of 2005 Jan 20 using two methods: a Monte-Carlo (MC) air-shower simulation [1] and a continuous slowing down (CSD) energy loss approximation [2,3]. For both methods…
radionuclide 10Be may provide information on the timing and magnitude of past ground level enhancements (GLEs) in cosmic rays. In this paper, ice core 10Be concentrations from recent decades are compared with neutron monitor data in order to test this hypothesis.
Fidelity and projected changes in the climate models, used for the Intergovernmental Panel on Climate … Change (IPCC) Fourth Assessment Report (AR4), are assessed with regard to the Southern Hemisphere … extratropical ocean and sea ice systems.
It is a glaring fact that climate, and in particular global warming and associated climate change, is having a major impact on life on Earth, and will continue to do so into the forseeable future 1, 2.
Prediction of the impact of global climate change on marine phytoplankton is fraught with uncertainties. Increasing temperature, enhanced surface stratification, alteration of ocean currents, intensification or weakening of local nutrient upwelling, stimulation of photosynthesis by elevated CO2…
The Ade´lie penguin is broadly distributed throughout the … Antarctic, with a minimum breeding population of c. 2.5 … million pairs (Woehler 1993). This value is based on many … separate, independent studies at smaller scales…
Potential Ad´elie penguin Pygoscelis adeliae breeding habitat in the AustralianAntarctic Territory (AAT: 45◦E–136◦E, 142◦E–160◦E) was mapped using a geographic information system (GIS)…
Reconstructing and modeling extent and dynamics of ice sheets is crucial in … understanding and predicting the evolution of ice sheets. Key to ice sheet dynamics are ice … streams, which drain most of the ice from the ice sheet interior to the ice shelves, where most of … the ice is lost.
The Amery Ice Shelf, East Antarctica, undergoes high basal melt rates near the southern … limit of its grounding line where 80% of the ice melts within 240km of becoming afloat. A considerable … portion of this later refreezes downstream as marine ice.
Tracking features between pairs of satellite synthetic aperture radar (SAR) images using image crosscorrelation … methods is a powerful tool for defining regions of image movement such as ice flow of Antarctic … glaciers. Unlike optical images…
Determining the mass balance of the Greenland and Antarctic ice sheets (GIS and AIS) has long … been a major challenge for polar science. But until recent advances in measurement technology…