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| Mackay Glacier | |
|---|---|
| Name | Mackay Glacier |
| Location | Victoria Land, Antarctica |
| Coordinates | 76°50′S 162°10′E |
| Length | ~29 km (18 mi) |
| Terminus | Granite Harbour, Ross Sea |
| Status | retreating |
Mackay Glacier is a valley glacier in Victoria Land that flows from the Antarctic Plateau eastward to Granite Harbour on the Ross Sea coast. The glacier lies within the Scott Coast sector of the Transantarctic Mountains and drains part of the Commonwealth Range and adjacent névés, connecting high interior ice to coastal outlet systems. Its ice dynamics, historical exploration, and contemporary responses to climatic forcing have made it a subject of research by teams from institutions such as the British Antarctic Survey, the United States Antarctic Program, and various universities.
Mackay Glacier originates on the Antarctic Plateau between peaks of the Transantarctic Mountains and descends through a trough toward Granite Harbour near Cape Bird and the Scott Coast. Its flow integrates tributaries from neighboring glaciers like David Glacier and channels through rock constraints associated with the Commonwealth Range and the Alpine Glacier catchments. Surface features include crevasse fields, medial moraines, and supraglacial streams that feed proglacial zones adjacent to the Ross Sea and the McMurdo Sound region. The glacier’s terminus interacts with coastal bathymetry near the Victoria Land Coast, influencing sediment deposition observed in fjord-like heads and inshore basins visited by explorers from expeditions led by figures such as Robert Falcon Scott and Ernest Shackleton.
Early charting of the Mackay Glacier region was conducted during expeditions to the Ross Sea and Victoria Land in the late 19th and early 20th centuries, including voyages associated with the Discovery Expedition and later with the Terra Nova Expedition. The glacier was named during surveys by parties connected to British Antarctic activities under leaders like Robert Falcon Scott and surveyors linked to the Commonwealth Trans-Antarctic Expedition. Scientific parties from the British Antarctic Territory era and logistical operations by the United States Navy and research vessels such as RRS Discovery and icebreakers visited adjacent coastal areas, contributing to cartographic records and place-name gazetteers compiled by committees such as the UK Antarctic Place-Names Committee and the Advisory Committee on Antarctic Names.
Studies of ice flow at Mackay Glacier have drawn on methods employed by researchers from the Scott Polar Research Institute, the Lamont–Doherty Earth Observatory, and the Polar Research Institute of China, including GPS surveys, satellite interferometry using platforms like Landsat and RADARSAT, and mass-balance measurements akin to those at Dry Valleys sites. The glacier exhibits temperate-ice behavior in parts of its ablation zone, with basal sliding influenced by subglacial hydrology tied to meltwater routing similar to processes documented at Blood Falls and in the Taylor Glacier system. Ice thickness and bed topography mapping using seismic reflection and ground-penetrating radar mirror techniques applied in studies at Whillans Ice Stream and Rutford Ice Stream, revealing grounding-zone configurations relevant to outlet stability and calving dynamics at the interface with the Ross Sea.
Recent monitoring by teams affiliated with National Science Foundation, NASA, and university groups has documented trends in surface lowering, frontal retreat, and changes in mass balance at the glacier consistent with regional warming trends observed across Antarctica and the Ross Ice Shelf sector. Remote-sensing analyses incorporating data from ICESat, CryoSat-2, and optical sensors show patterns of thinning similar to those reported for neighbouring outlets like Mariner Glacier and David Glacier, while oceanographic measurements from research cruises by vessels such as RV Polarstern indicate episodic warming of coastal waters that can enhance basal melt near the terminus. Modeling studies using frameworks from the Community Earth System Model and ice-sheet models developed at institutions including Potsdam Institute for Climate Impact Research and Geophysical Fluid Dynamics Laboratory project continued sensitivity to atmospheric and oceanic forcing under scenarios comparable to those assessed by the Intergovernmental Panel on Climate Change.
The proglacial and nearshore environments influenced by the glacier support microbial mats, cryoconite communities, and benthic assemblages studied in contexts similar to research at McMurdo Station and Cape Evans. Nutrient and sediment fluxes from glacial melt affect primary productivity in coastal zones linked to phytoplankton blooms observed in the Ross Sea and influence habitat conditions for species recorded by surveys from organizations such as the New Zealand Antarctic Programme and the Australian Antarctic Division, including Adélie penguin colonies and seals around Cape Royds and nearby rookeries. Environmental impact assessments by bodies like the Antarctic Treaty Consultative Meeting consider pollutant pathways and human footprint in the region, with conservation measures informed by insights from the Convention on the Conservation of Antarctic Marine Living Resources.
Human presence near the glacier has been episodic, centered on field camps, mountaineering parties, and logistical support from stations such as McMurdo Station, Scott Base, and seasonal field camps established by the British Antarctic Survey and the United States Antarctic Program. Scientific campaigns have included glaciological drilling, ice-core extraction akin to efforts at Dome C and Siple Dome, and multidisciplinary studies coordinated through networks like the Scientific Committee on Antarctic Research and national Antarctic programs. Access is typically via aircraft operations using ski-equipped planes associated with Antararktic logistics providers and icebreaker-supported ship operations similar to deployments by RV Nathaniel B. Palmer and RS Ernest Shackleton.
Category:Glaciers of Victoria Land Category:Scott Coast