Lambert Glacier

Lambert Glacier
Name	Lambert Glacier
Other name	Lambert Glacier System
Location	Princess Elizabeth Land, East Antarctica
Coordinates	73°S 70°E (approx.)
Length	~400 km
Width	~40–100 km
Area	largest outlet glacier by drainage area
Thickness	up to ~2,500 m
Terminus	Prydz Bay / Amery Ice Shelf
Status	studied for dynamic changes

Lambert Glacier

Introduction

Lambert Glacier is a major outlet glacier in East Antarctica that drains the inland Antarctic Plateau into the Amery Ice Shelf and ultimately Prydz Bay. The glacier links the high interior of the Australian Antarctic Territory with the coastal margin near Princess Elizabeth Land and lies adjacent to features such as the Mawson Sea and the Ingrid Christensen Coast. Recognized through surveys by expeditions including the Lars Christensen Expedition and mapped by the Australian National Antarctic Research Expeditions, it has been central to studies by institutions like the Australian Antarctic Division and the British Antarctic Survey.

Geography and Physical Characteristics

The glacier flows from the central East Antarctic Ice Sheet across a broad trough bounded by nunataks and mountain ranges such as the Prince Charles Mountains, feeding the Amery Ice Shelf near the Lars Christensen Coast. Its catchment encompasses drainage basins recognized in maps produced by the Scientific Committee on Antarctic Research and overlaps territorial claims administered by the Antarctic Treaty System signatories, including Australia. Measurements from Operation Highjump era surveys to modern satellite missions like Landsat, ICESat, and CryoSat quantify its length (roughly 400 km), width variation, and ice thickness reaching over 2,000 m in the grounding zone. The glacier’s surface is traversed by crevasse fields and shear margins influenced by tributaries such as channels draining near the Amery Oasis.

Glaciology and Dynamics

Lambert Glacier exhibits fast-flowing ice dynamics typical of large outlet systems, driven by basal sliding, internal deformation, and tributary inflows from the East Antarctic Plateau. Studies by researchers affiliated with Columbia University’s Lamont-Doherty Earth Observatory and the University of Tasmania employ radar sounding, GPS arrays, and airborne campaigns from NASA to resolve velocity fields and grounding-line migration. The glacier’s flow regime interacts with the Amery Ice Shelf buttressing; processes such as ice-stream acceleration, basal melting, and subglacial hydrology—investigated under programs like the International Polar Year—affect mass balance. Numerical models developed at centers including the Potsdam Institute for Climate Impact Research and the National Center for Atmospheric Research simulate stress balance, ice rheology, and potential responses to oceanic forcing documented by Southern Ocean expeditions.

Climate Change and Retreat

Contemporary research considers how ocean warming associated with changes in the Southern Ocean and Antarctic circumpolar currents might influence grounding-line stability at the glacier’s terminus adjacent to the Amery Ice Shelf. Satellite altimetry from missions by European Space Agency and NASA combined with field campaigns by the Australian Antarctic Program indicate variations in surface elevation and flow speed, informing projections from climate models used by the Intergovernmental Panel on Climate Change. Paleo-records from ice cores analyzed at laboratories linked to Woods Hole Oceanographic Institution and the British Antarctic Survey help place recent trends in a longer context, while studies by the National Aeronautics and Space Administration examine potential contributions to global sea-level rise under representative concentration pathways assessed by the World Meteorological Organization.

Exploration and Research History

Initial reconnaissance of the region was conducted during early 20th-century voyages such as those by the Lars Christensen Expedition and later systematic mapping occurred during Operation Highjump and the establishment of Mawson Station by the Australian National Antarctic Research Expeditions. Scientific investigation intensified during the International Geophysical Year with geophysical surveys and seismic profiling by teams from the Commonwealth Scientific and Industrial Research Organisation and the United States Antarctic Program. Modern interdisciplinary campaigns involve collaborations between institutions like the University of Cambridge’s Scott Polar Research Institute, Antarctic Climate and Ecosystems Cooperative Research Centre, and international consortia using tools from airborne radar to autonomous underwater vehicles operating beneath ice shelves.

Environmental Impact and Ecosystems

Although the glacier and associated ice shelf are largely inhospitable to macroscopic terrestrial life, downstream environments in Prydz Bay and polynyas near the Sørsdal Glacier host marine ecosystems studied by ecologists at the Australian Antarctic Division and the University of Tasmania. Changes in freshwater flux and ice mélange influence primary productivity, krill populations monitored by programs linked to the Commission for the Conservation of Antarctic Marine Living Resources, and higher trophic levels such as seals documented by researchers from the Institute of Marine Research and the British Antarctic Survey. Sediment transport and depositional regimes studied by geologists at the Antarctic Climate and Ecosystems Cooperative Research Centre provide records of past ice-sheet dynamics relevant to paleoclimate reconstructions.

Human Activity and Conservation

Human presence in the Lambert Glacier region is primarily scientific, supported by logistics from stations such as Mawson Station and research vessels operated by agencies including the Australian Antarctic Division, United States Antarctic Program, and British Antarctic Survey. Activities are governed by protocols under the Antarctic Treaty System and environmental assessments overseen by national programs and bodies like the Committee for Environmental Protection. Conservation priorities involve minimizing impacts from field campaigns, preserving paleoclimate archives in ice cores curated by repositories at institutions such as the National Ice Core Laboratory, and coordinating multinational research through forums like the Scientific Committee on Antarctic Research.

Category:Glaciers of Antarctica Category:East Antarctica