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| Mawson Sea | |
|---|---|
| Name | Mawson Sea |
| Location | Southern Ocean, off Queen Mary Land, Wilkes Land, East Antarctica |
| Coordinates | 66°S 95°E |
| Type | Marginal sea |
| Area | est. 200,000 km² |
| Basin countries | Antarctica |
| Max-depth | est. 3,000 m |
| Frozen | Seasonal and perennial sea ice |
Mawson Sea The Mawson Sea is a marginal arm of the Southern Ocean located off the coast of East Antarctica between segments of Queen Mary Land and Wilkes Land. It lies adjacent to major Antarctic features including the Mertz Glacier, the Dawson-Lambton Glacier, and the continental shelf of Antarctica. The sea is named in honor of the Australian Antarctic explorer Douglas Mawson, and it forms part of the coastal oceanographic region influencing the Antarctic Circumpolar Current and regional ice dynamics.
The Mawson Sea occupies a coastal embayment bounded to the west by the continental margin near Queen Mary Land and to the east by the shelf slope off Wilkes Land, intersecting with the flow of the Antarctic Coastal Current, the Antarctic Circumpolar Current, and regional shelf waters. Bathymetry includes submarine troughs and banks carved by past glacial advance and retreat, comparable to features near the Mertz Glacier Tongue, the Shackleton Ice Shelf vicinity, and the undersea Wilkes Basin. The sea overlays parts of the East Antarctic continental shelf that were influenced by the Pleistocene glaciations and the development of the Antarctic ice sheet. Icebergs calved from the nearby Pine Island Glacier–Thwaites Glacier system are less frequent here than in the Amundsen Sea but episodic discharges from local outlet glaciers affect navigability and shelf stratification. The Mawson Sea abuts areas of territorial claim by Australia known as the Australian Antarctic Territory and lies within the operational zones used by scientific programs from Australian Antarctic Division, Antarctica New Zealand, and other national programs.
Coastal sectors adjoining the Mawson Sea were first charted during early 20th-century expeditions such as the Australasian Antarctic Expedition led by Douglas Mawson, the United States Exploring Expedition legacy surveys, and later aerial mapping by the Operation Highjump task force. Systematic hydrographic surveys were advanced through post‑World War II efforts including Operation Windmill and Cold War-era research by USCGC Glacier and scientific cruises from institutions like the Scott Polar Research Institute and the Australian National Antarctic Research Expeditions. The name honors Douglas Mawson in recognition of contributions by the Australasian Antarctic Expedition and subsequent Australian scientific leadership; it was adopted in cartographic usage following multinational Antarctic nomenclature discussions involving the Scientific Committee on Antarctic Research and national naming authorities. Later ice-shelf events observed during the 20th and 21st centuries were documented by programs such as Landsat, ICESat, and the International Polar Year initiatives.
Circulation in the Mawson Sea is influenced by the interplay of the Antarctic Circumpolar Current, the shelf-modified Antarctic Coastal Current, and wind-driven coastal jets with forcing from the Southern Annular Mode and local katabatic winds originating from the East Antarctic Plateau near Dome A. Water masses include modified Antarctic Surface Water, Antarctic Intermediate Water, and inflows of Circumpolar Deep Water onto the shelf during upwelling events similar to processes observed off Wilkes Land and the Kerguelen Plateau. Seasonal stratification is controlled by brine rejection from sea ice formation, freshwater input from glacial melt associated with outlets like the Mertz Glacier and the Dawson-Lambton Glacier, and heat fluxes monitored by international arrays such as Argo floats adapted for polar deployment. Climate variability in the region ties to modes including the El Niño–Southern Oscillation teleconnections and trends in the Southern Hemisphere Annular Mode, with implications for surface temperature, sea ice extent, and polynya formation.
The Mawson Sea experiences complex sea ice regimes with fast ice anchored to coastal promontories and seasonal pack ice influenced by storms and offshore winds; recurrent polynyas form in areas of strong katabatic drainage similar to the Cape Darnley polynya and Mertz Glacier Polynya. Ice dynamics are dominated by calving from adjacent glaciers and ice shelves, iceberg drift tracked by programs like ICESat-2 and CryoSat-2, and grounding-line changes in the Wilkes Subglacial Basin area. Glaciological research here addresses mass balance of outlet glaciers, the stability of ice tongues, and responses to intrusions of warm Circumpolar Deep Water, paralleling concerns for the Amundsen Sea Embayment and Totten Glacier. Long-term satellite altimetry and airborne radar surveys by platforms such as Operation IceBridge document thinning, grounding-line retreat, and basal processes.
The Mawson Sea supports polar marine ecosystems characterized by seasonal phytoplankton blooms driven by light availability and iron fertilization processes akin to those near the Ross Sea and Weddell Sea. Primary producers include diatoms and cryptophytes that sustain krill populations, small zooplankton, and higher trophic levels such as Antarctic krill, penguins like Adélie penguin, seals including Weddell seal and crabeater seal, and cetaceans such as minke whale and orca observed in East Antarctic waters. Benthic communities inhabit the continental shelf with sponges, suspension feeders, and echinoderms similar to assemblages studied by the CCAMLR and biodiversity surveys conducted during the Commission for the Conservation of Antarctic Marine Living Resources research programs. The region's biodiversity is monitored through international efforts including the Global Ocean Observing System and biogeographic mapping by SCAR.
Human presence in the Mawson Sea region is limited to scientific expeditions, logistical support from stations including Mawson Station, research cruises from vessels operated by Australian Antarctic Division, Antarctica New Zealand, and other national programs, and remote sensing by satellites such as Landsat and Sentinel. Research priorities include glaciology, oceanography, climate monitoring, and ecosystem assessments coordinated under frameworks like the Scientific Committee on Antarctic Research and the Commission for the Conservation of Antarctic Marine Living Resources. Maritime operations follow guidance from the International Maritime Organization polar code and environmental protections under the Protocol on Environmental Protection to the Antarctic Treaty to minimize impacts on the fragile Antarctic environment.
Category:Seas of the Southern Ocean Category:Coasts of Antarctica