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| Subglacial Lake Concordia | |
|---|---|
| Name | Subglacial Lake Concordia |
| Location | East Antarctica, Dome C |
| Coordinates | 75°06′S 123°23′E |
| Type | Subglacial lake |
| Area | ~? km2 |
| Max depth | ~? m |
| Frozen | yes (sealed beneath Antarctic Ice Sheet) |
| Discovered | 1990s–2000s |
| Basin countries | Antarctica |
Subglacial Lake Concordia is a subglacial lake beneath the East Antarctic Ice Sheet near Dome C that has been the focus of interdisciplinary research by international teams including European Space Agency, French Polar Institute Paul-Émile Victor, National Science Foundation (United States), Italian National Antarctic Research Program, and Australian Antarctic Division. The site lies in the region of Adélie Land claims and on the Antarctic Plateau near Vostok Station and Concordia Station, and it has attracted collaborations among institutions such as Université Grenoble Alpes, British Antarctic Survey, Scott Polar Research Institute, and Woods Hole Oceanographic Institution.
Initial indications of a liquid water body under the ice near Dome C emerged from airborne radio-echo sounding surveys conducted by teams from Scott Polar Research Institute, Lamont–Doherty Earth Observatory, and National Aeronautics and Space Administration in the late 20th century, following earlier radar work by John Robin,[ [Vladimir Kort and others investigating the Antarctic Ice Sheet. Subsequent targeted geophysical campaigns involving European Space Agency CryoSat support, gravimetry from British Antarctic Survey, and seismic profiling by Italian National Antarctic Research Program and French Polar Institute Paul-Émile Victor refined the bathymetry and ice thickness estimates. Direct access strategies were debated in meetings at Scientific Committee on Antarctic Research and workshops hosted by International Association of Cryospheric Sciences, leading to sterilized drilling proposals inspired by the WISSARD and ANDRILL projects and protocols from Committee for Environmental Protection.
Situated on the inland Antarctic Plateau near Dome C and close to Concordia Station, the lake occupies a depression in the sub-ice bedrock above portions of the East Antarctic Shield mapped by geologists from Institut Polaire Français and Geoscience Australia. Bed topography derived from radar surveys by Scott Polar Research Institute and United States Geological Survey shows a confined basin with spatial scales compared in literature to Subglacial Lake Vostok and Lake Whillans, and comparative studies reference Wilkes Land and Queen Maud Land subglacial basins. Ice overburden thickness measurements by teams from British Antarctic Survey and Université Libre de Bruxelles indicate extreme pressure and low geothermal flux characteristic of central East Antarctica.
The hydrologic regime beneath Dome C is inferred from work by Lamont–Doherty Earth Observatory, University of Texas at Austin glaciophysicists, and University of Cambridge cryosphere groups studying basal melting, englacial routing, and subglacial water exchange documented in contexts like Subglacial Lake Vostok and Lake Ellsworth. Basal melt rates and pressure-driven flow are modeled using frameworks developed at Potsdam Institute for Climate Impact Research and Imperial College London, while satellite altimetry from European Space Agency missions and NASA instruments constrains surface elevation changes linked to subglacial hydrologic variability similar to observations near Whillans Ice Stream and Byrd Glacier. Interactions with subglacial sediments described by researchers at Texas A&M University and University of Alaska Fairbanks shape hypotheses about nutrient fluxes and geochemical gradients analogous to those at Lake Untersee.
Microbiological interest in the site draws on methodologies from teams at Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, University of Colorado Boulder, and Monash University that have investigated life in extreme environments such as Lake Vostok, Lake Vostok accretion ice, Lake Vida, and Lake Vostok. Sterile sampling protocols modeled on WISSARD and ANDRILL informed proposals from French Polar Institute Paul-Émile Victor and British Antarctic Survey to search for chemolithoautotrophic communities, extremophiles, and microbial mats using molecular techniques developed at Max Planck Institute for Marine Microbiology and J. Craig Venter Institute. Isotopic and biomarker analyses planned with Lawrence Livermore National Laboratory and Natural History Museum, London aim to test hypotheses about energy sources analogous to subglacial ecosystems studied near Lake Vostok and Lake Whillans.
Research programs led by Concordia Station teams, supported by European Space Agency, National Science Foundation (United States), Italian National Antarctic Research Program, and Centre National de la Recherche Scientifique frame the lake as a natural laboratory for questions relevant to astrobiology missions of European Space Agency and NASA targeting icy moons such as Europa and Enceladus. Interdisciplinary projects involving Smithsonian Institution paleoclimatologists, Université Grenoble Alpes glaciologists, and University of Cambridge geochemists use the site to study past climate archives, subglacial biogeochemistry, and long-term ice-sheet stability relevant to policy discussions at Intergovernmental Panel on Climate Change. Instrument development collaborations with Woods Hole Oceanographic Institution, National Center for Atmospheric Research, and Jet Propulsion Laboratory advance low-contamination drilling, in situ sensors, and autonomous platforms.
Environmental protection for operations at Dome C is governed by agreements and guidance from Antarctic Treaty System, Protocol on Environmental Protection to the Antarctic Treaty, and oversight by Committee for Environmental Protection, with technical standards influenced by precedents set in Lake Vostok access planning and the Scientific Committee on Antarctic Research code of conduct. National operators such as Australian Antarctic Division, Italian National Antarctic Research Program, French Polar Institute Paul-Émile Victor, and National Science Foundation (United States) coordinate environmental impact assessments and contamination-control measures consistent with obligations under Madrid Protocol and Council of Managers of National Antarctic Programs best practices.
Planned initiatives involving European Space Agency, NASA, Centre National de la Recherche Scientifique, British Antarctic Survey, and Italian National Antarctic Research Program prioritize clean access drilling, autonomous sampling platforms developed with Woods Hole Oceanographic Institution and Scripps Institution of Oceanography, and high-resolution geophysical mapping using assets from Lamont–Doherty Earth Observatory and Potsdam Institute for Climate Impact Research. Future work aims to integrate paleoclimate records sought by Smithsonian Institution and Université Grenoble Alpes with subglacial ecology studies relevant to astrobiology targets promoted by NASA and European Space Agency, while policy engagement with Scientific Committee on Antarctic Research and Committee for Environmental Protection will determine timing and protocols for any in situ investigations.
Category:Subglacial lakes of Antarctica