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| Fimbul Ice Shelf | |
|---|---|
| Name | Fimbul Ice Shelf |
| Location | Queen Maud Land, Antarctica |
| Coordinates | 71°S 0°E |
| Length | ~200 km |
| Width | ~100 km |
| Area | ~60,000 km² |
| Status | monitored |
Fimbul Ice Shelf is a large Antarctic ice shelf bordering Queen Maud Land, lying off the coast of the Atlantic Ocean sector of Antarctica near the eastern Weddell–Enderby region. The shelf interfaces with nearby coastal features such as the Sør Rondane Mountains and oceanographic domains including the Southern Ocean and the Drake Passage circulation systems, and it has been a focus for international scientific programs from institutions like the Norwegian Polar Institute and the British Antarctic Survey. Research into the shelf links to programs and treaties such as the Antarctic Treaty System and projects coordinated under agencies like the National Science Foundation and the European Space Agency.
The ice shelf occupies coastal embayments along Queen Maud Land between prominent geographic markers including the Sør Rondane Mountains, the Princess Martha Coast, and the Princess Astrid Coast, receiving glacial input from outlet glaciers draining parts of the East Antarctic Ice Sheet such as catchments near the Shirase Glacier vicinity. Its horizontal extent and shelf front vary seasonally and interannually, with calving events that produce icebergs influencing downstream regions like the Weddell Sea and currents associated with the Antarctic Circumpolar Current, while bathymetry beneath the shelf interacts with features mapped by expeditions like the Norwegian–British–Swedish Antarctic Expedition. Measurements of thickness, surface elevation, and basal topography are informed by remote sensing from platforms including Landsat, ICESat, and CryoSat satellites and field campaigns by organizations such as the Alfred Wegener Institute.
The shelf forms via the seaward extension and floating of grounded ice from tributary glaciers fed by interior accumulation over the East Antarctic Ice Sheet and influenced by atmospheric circulation patterns related to the Southern Annular Mode and teleconnections like the El Niño–Southern Oscillation. Internal ice dynamics are governed by processes described in glaciological theory from work of researchers associated with Scott Polar Research Institute and methodologies developed by groups such as the International Glaciological Society, including flow law parameterizations, basal sliding, and strain localization. Mass balance is determined by the interaction of snowfall deposition, firn compaction, basal melt driven by ocean heat flux, and calving governed by fracture mechanics examined in literature from the United Nations Environment Programme-sponsored assessments.
Climatic forcing on the region is modulated by atmospheric phenomena including the Antarctic Oscillation and variability associated with the Southern Hemisphere Westerlies, while ocean forcing arises from exchanges with the Southern Ocean water masses such as the modified Circumpolar Deep Water and shelf waters that influence basal melting. Observational programs from institutions like Bjerknes Centre for Climate Research and modelling efforts from groups such as the Met Office Hadley Centre and the Max Planck Institute for Meteorology use coupled atmosphere–ocean models and reanalysis products to quantify heat and salt transport, basal heat fluxes, and feedbacks involving sea ice produced in collaboration with the National Oceanic and Atmospheric Administration and the University of Cambridge polar research teams.
The marine ecosystems adjacent to the shelf front support communities including Antarctic krill, Adélie penguin, and Weddell seal populations, with primary productivity influenced by upwelling and sea-ice dynamics studied by marine biologists from the Scripps Institution of Oceanography and the Australian Antarctic Division. Benthic habitats near grounding zones host diverse assemblages documented in surveys by research vessels like RV Polarstern and programs coordinated through the Scientific Committee on Antarctic Research. Ecosystem responses integrate drivers from trophic interactions described in works associated with the International Union for Conservation of Nature and long-term ecological monitoring programs such as those run by the British Antarctic Survey.
Scientific bases and field programs operating in the wider region include facilities run by Norway, Germany, Japan, and South Africa, with logistics often staged through polar platforms like RRS James Clark Ross and RV Aurora Australis. Research spans glaciology, oceanography, and biology, involving collaborations among institutions including the Norwegian Polar Institute, the Alfred Wegener Institute, the University of Tasmania, and the University of Oslo, and utilizing tools from satellite remote sensing missions by NASA and the European Space Agency as well as airborne surveys and autonomous underwater vehicles developed by WHOI teams.
Monitoring of the shelf employs satellite altimetry from missions such as ICESat-2, gravity measurements from GRACE, and interferometric synthetic aperture radar from satellites like Sentinel-1 to track changes in thickness, grounding line migration, and calving. Studies published by research groups at institutions including the Norwegian Polar Institute and the British Antarctic Survey report trends linked to ocean warming, variability in sea-ice cover, and cryosphere–climate feedbacks examined in assessments by organizations like the Intergovernmental Panel on Climate Change and in international programs such as ANTCLIM-style collaborations.
Management and protection of Antarctic environments are governed by the Antarctic Treaty System frameworks, including measures under the Protocol on Environmental Protection to the Antarctic Treaty and tools for marine protection such as CCAMLR-guided marine protected areas, with scientific input from SCAR and policy coordination among consultative parties like Norway, United Kingdom, Japan, Germany, and Australia. Conservation strategies emphasize minimizing human footprint from research operations conducted from stations like Troll Station and vessels such as RV Polarstern while supporting international monitoring and data sharing through initiatives facilitated by the Scientific Committee on Antarctic Research and multinational research programs.