Totten Glacier

Totten Glacier
Public domain · source
Name	Totten Glacier
Location	Wilkes Land, East Antarctica
Coordinates	66°S 125°E
Length	~250 km (ice catchment)
Thickness	up to ~3,000 m
Terminus	East Indian Ocean (Amundsen Sea sector influence via continental shelf)
Status	thinning and ice-shelf retreat observed

Totten Glacier is a major outlet glacier in Wilkes Land on the coast of East Antarctica, draining a large sector of the East Antarctic Ice Sheet into the coastal ocean near the Indian Ocean. The glacier’s deep grounding line, extensive ice shelf, and connection to a basin make it a focal point for research by institutions such as the Australian Antarctic Division, NASA, National Science Foundation, and the British Antarctic Survey. Totten’s dynamics are closely monitored because of its potential contribution to global sea level change and its links to oceanographic processes near the Southern Ocean and continental shelf.

Geography and Physical Characteristics

Totten sits on the Wilkes Basin margin and channels ice from the inland plateau of the East Antarctic Ice Sheet toward the continental margin near Mawson Station and the Amundsen sector transition. The glacier drains a catchment comparable in area to France or Texas, with tributaries feeding through subglacial valleys and troughs mapped by airborne radar from programs led by CSIRO, Scripps Institution of Oceanography, and Lamont–Doherty Earth Observatory. Bed topography studies using missions from Operation IceBridge and satellites such as ICESat and CryoSat-2 reveal a basal relief that includes reverse-sloping beds and deep troughs that reach below sea level, similar to features seen in the Thwaites Glacier catchment. Surface features include crevasse fields, rifts, and an ice front that interacts with seasonal sea ice near the Mertz Glacier region.

Glaciology and Ice Dynamics

Totten’s flow regime is governed by basal sliding, internal deformation, and interaction with an ice shelf that buffers grounding line retreat. Observational campaigns by teams at University of Tasmania and University of Washington have combined GPS, satellite altimetry, and radar to quantify strain rates, ice flux, and grounding line migration. The glacier exhibits grounding line processes analogous to those studied at Pine Island Glacier and Jakobshavn Glacier, with buttressing effects from the ice shelf modulated by ocean-driven melting. Ice-penetrating radar surveys have revealed subglacial hydrology networks and sedimentary basins that influence ice rheology, comparable to subglacial conditions beneath Fennoscandia outlets and Greenland Ice Sheet channels mapped by Alfred Wegener Institute. Numerical ice-sheet models developed at Potsdam Institute for Climate Impact Research, University of Bristol, and Scripps Institution of Oceanography simulate Totten’s response under scenarios used by the Intergovernmental Panel on Climate Change.

Climate Change and Sea Level Implications

Warming of the Southern Ocean and intrusion of warm, salty Circumpolar Deep Water onto the continental shelf have been implicated in increased basal melt beneath Totten’s ice shelf, as observed by oceanographic cruises from CSIRO, Commonwealth Scientific and Industrial Research Organisation, and collaborations with Woods Hole Oceanographic Institution and GEOMAR. Because Totten drains portions of the Wilkes Basin that could release ice equivalent to multiple meters of global sea level if destabilized, the glacier features prominently in studies by IPCC, National Oceanic and Atmospheric Administration, and ICES (International Commission for Exploration of the Seas). Modeling intercomparisons conducted by Potsdam Institute, MIT, University of Oxford, and Columbia University examine thresholds for marine ice sheet instability, grounding line retreat, and long-term contributions to projections used by coastal planners in regions such as Bangladesh, Florida, and Netherlands.

Research History and Scientific Observations

Totten was first noted in early aerial reconnaissance by expeditions linked to U.S. Navy Operation Highjump and Australian surveys around Mawson Station with subsequent mapping by the Australian National Antarctic Research Expeditions. Modern scientific attention accelerated with satellite missions including Landsat, ERS-1, ERS-2, Envisat, Sentinel-1, ICESat-2, and radar altimetry programs. Key research milestones include ice-penetrating radar mapping by CSRIO teams, oceanographic transects by RV Investigator and RRS James Clark Ross, and numerical modeling projects funded by agencies such as NASA's Cryospheric Sciences Program, the European Space Agency, and the Australian Research Council. Collaborative field campaigns have involved institutions like University of Tasmania, University of Texas at Austin, Scripps Institution of Oceanography, and Chinese Academy of Sciences teams conducting borehole drilling, sub-ice profiling, and sediment coring to reconstruct past behavior during glacial-interglacial cycles.

Human Interaction and Logistics

Human presence near Totten is primarily scientific, staged through logistics hubs such as Mawson Station, with support from Australian Antarctic Division aircraft operations, icebreaker voyages by vessels like Aurora Australis and research ships operated by CSRIO and ANARE, and international cooperation involving United States Antarctic Program assets. Fieldwork requires coordination with Antarctic Treaty System guidelines and environmental protocols overseen by consultative parties including Australia, United States, United Kingdom, China, and Russia. Remote sensing and autonomous platforms—gliders from Woods Hole Oceanographic Institution, autonomous underwater vehicles from Scripps Institution of Oceanography, and satellite tasking from European Space Agency—reduce the need for prolonged human intrusion while enabling year-round monitoring. Logistics challenges include crevasse navigation analogous to operations near Scott Base and McMurdo Station, long-range radio and satellite communications, and ice-runner aircraft support from Royal Australian Air Force assets used in polar operations.

Category:Glaciers of Wilkes Land