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| Seas of Antarctica | |
|---|---|
| Name | Antarctic seas |
| Caption | Map showing seas around the Antarctic continental shelf and pack-ice |
| Location | Southern Ocean, surrounding Antarctica |
| Type | Marginal seas |
Seas of Antarctica
The seas surrounding Antarctica form a complex assemblage of marginal seas, embayments, and continental margins that fringe the Antarctic continental shelf and the Southern Ocean. These marine areas include named marginal seas, subpolar basins, and coastal embayments associated with major Antarctic features such as Ross Sea, Weddell Sea, Amundsen Sea, Bellingshausen Sea, and Scotia Sea. They are central to international research programs like the International Geophysical Year, regional governance under the Antarctic Treaty System, and global processes involving the Southern Ocean and the Antarctic Circumpolar Current.
The geographic limits of Antarctic seas are defined by features including the Antarctic continental shelf, major ice shelves such as the Ross Ice Shelf and Ronne Ice Shelf, and bathymetric structures like the South Scotia Ridge and East Antarctic Rise, which delineate basins like the Weddell Basin and the Ronne-Filchner Basin. National claims by Australia (territory of Heard Island and McDonald Islands), Argentina (Antarctic claim), Chile (Antarctic claim), United Kingdom (British Antarctic Territory), New Zealand (Ross Dependency), Norway (Queen Maud Land), and France (Adélie Land) overlap with maritime features such as the D’Urville Sea, Cooperation Sea, Balleny Basin, and the Bellinghausen Sea nomenclature used in various hydrographic charts. Bathymetric mapping from expeditions like RV Polarstern surveys and projects led by institutions such as the British Antarctic Survey and the United States Geological Survey improved delimitation alongside international conventions of the Commission on the Limits of the Continental Shelf.
Oceanographic regimes in Antarctic seas are controlled by the Antarctic Circumpolar Current, the Antarctic Coastal Current, and water masses including Antarctic Bottom Water and Circumpolar Deep Water. Seasonal formation of sea ice and the dynamics of pack ice, polynyas such as the Weddell Polynya, and fast ice around features like McMurdo Sound influence stratification, salinity, and primary productivity monitored by platforms from NASA satellites and autonomous floats from the Global Ocean Observing System. Ice-shelf melt, iceberg calving from ice fronts monitored during events recorded by Operation Deep Freeze and missions using ICESat and CryoSat, modulate thermohaline circulation and sea-ice extent, with feedbacks to global processes studied by groups at the Scripps Institution of Oceanography and Woods Hole Oceanographic Institution.
Antarctic seas interact with atmospheric systems including the Southern Annular Mode, El Niño–Southern Oscillation teleconnections, and the Pacific Decadal Oscillation, influencing Southern Hemisphere climate anomalies observed across Patagonia, South Africa, and New Zealand. Cyclogenesis in regions like the South Pacific Antarctic Convergence and storms tracked by the World Meteorological Organization affect sea state and swell propagation toward islands such as South Georgia and the Falkland Islands. Long-term trends in sea-surface temperature and surface wind stress have been incorporated into assessments by the Intergovernmental Panel on Climate Change and regional analyses by the Scientific Committee on Antarctic Research.
Antarctic seas host unique communities including keystone species such as Antarctic krill, Emperor penguin, Weddell seal, minke whale, and benthic assemblages around hydrothermal and cold-seep sites surveyed near the South Sandwich Trench and Prince Gustav Channel. Primary productivity driven by diatom blooms interacts with grazing by Adelie penguin colonies and baleen whales documented by the International Whaling Commission and researchers from institutions like the Monterey Bay Aquarium Research Institute. Biodiversity hotspots include the Ross Sea Marine Protected Area and seamounts monitored through programs by CCAMLR and expeditions funded by agencies such as the National Science Foundation and the European Research Council.
Human activity in Antarctic seas comprises research operations (e.g., RRS Sir David Attenborough, Aurora Australis), regulated fisheries targeting species under the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR), and tourism managed by operators accredited through IAATO. Governance is coordinated via the Antarctic Treaty System, consultative meetings involving parties like United States, Russia, China, and Australia, and enforcement by flag states and occasionally by escorts such as coast guard vessels from Chile and Argentina. Shipping lanes and rescue responsibilities involve coordination with International Maritime Organization rules, polar code standards, and research support from national programs including Australian Antarctic Division and Russian Antarctic Expedition.
Exploration of Antarctic seas was advanced by expeditions such as James Clark Ross's voyage that named the Ross Sea, Ernest Shackleton's crossings, Roald Amundsen's polar navigation, and Richard E. Byrd's aerial surveys. Nomenclature reflects explorers and vessels like Bellingshausen, Wilkes, D'Urville, and later hydrographic surveys by HMS Endurance and HMS Terror legacy mappings. Place-names and historical cartography evolved through contributions from institutions including the Scott Polar Research Institute, national hydrographic offices, and committees like the Scientific Committee on Antarctic Research’s geographic names working group.
Current research priorities include monitoring ice-shelf stability assessed by teams at Lamont–Doherty Earth Observatory, studying carbon uptake and biogeochemical cycles with programs from the International Ocean Carbon Coordination Project, and assessing fisheries sustainability under CCAMLR measures influenced by studies from Plymouth Marine Laboratory and the University of Tasmania. Conservation debates center on establishment of marine protected areas, impacts of climate-driven shifts studied in reports by the IPCC, invasive species management highlighted by the Committee for Environmental Protection, and coordination of long-term observing systems supported by GEOTRACES and the Global Climate Observing System.