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| Poincenot Glacier | |
|---|---|
| Name | Poincenot Glacier |
| Location | Antarctica |
| Coordinates | 68°S 45°W |
| Length | 6 nautical miles |
| Terminus | Lemaire Channel |
| Region | Danco Coast, Graham Land |
| Status | retreating |
Poincenot Glacier is a small alpine glacier flowing northward from the plateau of Graham Land into the head of the Lemaire Channel on the Danco Coast of Antarctica. It lies between prominent headlands and feeds ice into a narrow marine fjord known for steep-sided cliffs and frequent iceberg calving. The glacier has been documented by multiple 20th- and 21st-century Antarctic expeditions and has featured in oceanographic, geological, and climate studies related to the western Antarctic Peninsula.
Poincenot Glacier occupies a short valley on the western flank of Graham Land between rocky promontories adjacent to the Lemaire Channel, a strait separating Gerlache Strait and nearby islands such as Booth Island. The glacier’s catchment drains part of the coastal slopes of the Antarctic Peninsula mountain chain, bordered by nunataks and headlands recorded on charts from Belgian Antarctic Expedition surveys and later by British Antarctic Survey topographic mapping. The terminus lies at sea level within a narrow fjord environment, influencing local bathymetry measured by researchers from institutions including the Scott Polar Research Institute and the Scripps Institution of Oceanography. Proximal geographic features include the coastal embayment near Paradise Harbor and ice-choked passages frequented by vessels from the RRS James Clark Ross and tourist ships operating under the International Association of Antarctica Tour Operators guidelines.
Glaciological attributes of the glacier include a short flowline, temperate marginal conditions, and a predominantly cold-based accumulation zone on the plateau of Graham Land. Mass balance studies reference accumulation from orographic snowfall associated with cyclonic systems originating in the Southern Ocean and ablation dominated by submarine melting and calving at the Lemaire Channel terminus. Ice dynamics have been contextualized using satellite remote sensing from Landsat, Sentinel-1, and radar altimetry missions from ICESat and CryoSat-2, and modeled with ice-flow codes developed at the University of Cambridge and the University of Washington. Crevasse patterns and surface velocity fields have been compared to neighboring outlets such as glaciers flowing into Paradise Harbor and Neny Fjord.
Early charting of the area occurred during the late 19th and early 20th centuries by expeditions including the Belgian Antarctic Expedition (Adrien de Gerlache) and later reconnaissance by the French Antarctic Expedition and British Graham Land Expedition. The glacier was formally surveyed and named during mid-20th-century operations by teams affiliated with the Falkland Islands Dependencies Survey (later the British Antarctic Survey) and with contributions from personnel connected to the United States Antarctic Service Expedition. The name reflects commemorative practice honoring individuals or vessels involved in polar logistics and was recorded in gazetteers maintained by the Scientific Committee on Antarctic Research and national naming authorities such as the U.S. Advisory Committee on Antarctic Names and the UK Antarctic Place-names Committee.
Scientific work on and around the glacier spans glaciology, oceanography, geology, and biology. Oceanographers from Woods Hole Oceanographic Institution and Lamont–Doherty Earth Observatory have linked submarine melt processes to fjord circulation measured with CTD casts and autonomous underwater vehicles. Geologists from the British Antarctic Survey and the Natural History Museum, London have sampled erratics and bedrock outcrops to constrain the region’s tectonic history related to the Antarctic Plate and past connections to South America during Gondwana. Biologists studying coastal ecosystems have documented krill, penguin colonies, and benthic communities influenced by glacial freshwater input, collaborating with programs such as the Scientific Committee on Antarctic Research Antarctic Climate & Ecosystems initiative and the Convention on the Conservation of Antarctic Marine Living Resources research efforts. Long-term monitoring uses satellite time series from NASA and European Space Agency missions alongside field campaigns supported by the British Antarctic Survey and the Spanish National Research Council.
Regional warming of the Antarctic Peninsula has produced pronounced glacial retreat, thinning, and increased calving for many outlets similar to Poincenot Glacier, trends documented in IPCC assessments and peer-reviewed studies by researchers at Colorado State University and the University of Maine. Observations indicate negative mass balance over recent decades, surface lowering inferred from altimetry, and retreat of the terminus correlated with rising sea surface temperatures and modified wind patterns linked to shifts in the Southern Annular Mode. Ice-shelf collapse events elsewhere on the peninsula, such as the breakups of the Larsen A and Larsen B ice shelves, provide context for rapid dynamical responses; while Poincenot Glacier lacks a large floating ice tongue, its sensitivity to ocean forcing and atmospheric warming aligns with regional vulnerability documented by the Intergovernmental Panel on Climate Change and the Scientific Committee on Antarctic Research.
Access to the glacier is primarily by ship via the Gerlache Strait and Lemaire Channel during austral summer when sea ice extent is reduced and tourist and research vessels—including those from the National Science Foundation-funded US Antarctic program and polar operators certified by the International Association of Antarctica Tour Operators—can navigate coastal waters. Field programs deploy Zodiac craft, helicopters from ice-capable ships like the RV Polarstern, and small shore parties supported by bases such as Rothera Research Station and historic refuges. Logistics require coordination with national Antarctic programs including the British Antarctic Survey, the Argentine Antarctic Program, and the Instituto Antártico Chileno for overflight permissions under the Antarctic Treaty System protocols and environmental impact assessments mandated by the Protocol on Environmental Protection to the Antarctic Treaty.
Category:Glaciers of Danco Coast