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| Wordie Ice Shelf | |
|---|---|
| Name | Wordie Ice Shelf |
| Type | Ice shelf (former) |
| Location | Fallières Coast, Antarctic Peninsula |
| Coordinates | 69°S 68°W |
| Status | Disintegrated / Retreating |
Wordie Ice Shelf was a once-extensive ice shelf fringing the western side of the Antarctic Peninsula, located along the Fallières Coast near Marguerite Bay. It was monitored by explorers, surveyors, and scientists from institutions such as the British Antarctic Survey, United States Geological Survey, NASA, European Space Agency, National Oceanic and Atmospheric Administration and universities including University of Cambridge, University of Edinburgh, Columbia University, University of Bristol, University of Alaska Fairbanks and University of Cambridge Trinity Hall. Over decades the shelf experienced progressive retreat and disintegration documented by aircraft campaigns, satellite missions, and field expeditions.
The ice shelf occupied embayments adjacent to prominent landmarks such as Marguerite Bay, George VI Sound, Fallières Coast, Alexander Island, Palmer Land, Antarctic Peninsula and nearby features like Neny Bay and Rymill Bay. Early charts from the United Kingdom Antarctic Place-Names Committee and maps by the Scott Polar Research Institute and British Antarctic Survey delineated tongues and ice fronts that transitioned seasonally with influences from Bellingshausen Sea inflow and circulation tied to the Southern Ocean. Bathymetric surveys by vessels of the Royal Navy and research ships including RRS John Biscoe and RV Polarstern showed grounding lines interacting with submarine basins mapped alongside work by the Lamont–Doherty Earth Observatory and Scripps Institution of Oceanography.
Named during 20th-century British expeditions, the feature was observed by surveyors connected to expeditions such as the British Graham Land Expedition and later charted during operations involving the Falkland Islands Dependencies Survey and the United States Antarctic Service Expedition. Photographs and reports from aviators affiliated with Sir Hubert Wilkins flights, Lincoln Ellsworth trans-Antarctic surveys, and reconnaissance from Operation Highjump contributed to early records. Nomenclature decisions were made by bodies including the Advisory Committee on Antarctic Names and the UK Antarctic Place-names Committee reflecting the contributions of figures tied to polar exploration and scientific endeavors like James Wordie and associated exploration networks such as the Scott Polar Research Institute and institutions like Royal Geographical Society, National Science Foundation, Meteorological Office, Australian Antarctic Division, and Scottish Association for Marine Science.
Glaciological studies integrated methodologies from teams at British Antarctic Survey, University of Cambridge Scott Polar Research Institute, University of Tasmania, University of Maine, Colorado State University, Uppsala University, University of Oslo, University of Bern and University of Zurich combining ice-penetrating radar, GPS, satellite altimetry, and oceanographic moorings. Process understanding drew on theories advanced by researchers associated with IGY-era programs, the International Geophysical Year, and modern modeling groups at NCAR, MIT, Caltech, Jet Propulsion Laboratory, Potsdam Institute for Climate Impact Research and Max Planck Institute for Meteorology. Mechanisms included basal melting by warm intrusions influenced by Antarctic Circumpolar Current variability, calving modulated by structural weaknesses analogous to phenomena studied near Larsen Ice Shelf, Ronne Ice Shelf, Filchner–Ronne Ice Shelf, Amundsen Sea Embayment and Pine Island Glacier.
The progressive retreat and partial collapse observed across late 20th and early 21st centuries were placed in context alongside retreat events at Larsen A, Larsen B, Prince Gustav Channel and thinning episodes affecting Pine Island Glacier and Thwaites Glacier. Remote sensing from missions including Landsat, ERS, Envisat, ICESat, CryoSat-2, MODIS and Sentinel-1 documented area loss that corresponded with atmospheric warming trends reported by groups such as Intergovernmental Panel on Climate Change, World Meteorological Organization and National Aeronautics and Space Administration. Consequences included altered local albedo and sea-ice formation patterns affecting circulation in Marguerite Bay and ecosystems tied to food webs studied by researchers from British Antarctic Survey, Smithsonian Institution, Monterey Bay Aquarium Research Institute, Australian Antarctic Division and universities including University of Canterbury and University of Otago.
Long-term monitoring integrated field campaigns by teams from British Antarctic Survey, National Science Foundation-funded projects, collaborations with NASA Goddard Space Flight Center, European Space Agency programmes and modeling consortia at Los Alamos National Laboratory, University of California, Irvine, University of Washington and Imperial College London. Techniques included time-lapse photogrammetry used by groups like Scott Polar Research Institute, airborne laser altimetry from NASA Operation IceBridge, oceanographic profiling by Australian Antarctic Division and autonomous platforms developed at Woods Hole Oceanographic Institution and WHOI. Data synthesis efforts featured contributions to archives maintained by SCAR, COMNAP, Polar Data Centre and collaborative networks such as Global Cryosphere Watch.
The ice shelf’s dynamics shaped habitats for species studied by researchers at British Antarctic Survey, University of Exeter, University of Cambridge Department of Zoology, Scripps Institution of Oceanography and organizations like Antarctic and Southern Ocean Coalition and International Union for Conservation of Nature. Changes influenced populations of Antarctic krill, Adélie penguin, Gentoo penguin, Weddell seal, crabeater seal, leopard seal and cetaceans documented by teams from New Zealand Antarctic Programme, Australian Antarctic Division and South African National Antarctic Programme. Climatic links connected shelf loss to regional warming patterns analyzed by Intergovernmental Panel on Climate Change, paleoclimate reconstructions from British Antarctic Survey ice cores, and coupled models developed at Met Office Hadley Centre and Princeton University. Continued study remains central to understanding cryosphere–ocean–atmosphere interactions relevant to projections produced by research centers such as IPSL, NOAA Geophysical Fluid Dynamics Laboratory and National Center for Atmospheric Research.
Category:Ice shelves of Graham Land