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| Campo de Hielo Patagónico Sur | |
|---|---|
| Name | Campo de Hielo Patagónico Sur |
| Other name | Southern Patagonian Ice Field |
| Location | Magallanes Region, Aysén Region, Chile, Santa Cruz Province, Argentina |
| Type | Ice field |
| Area | ~12,000 km2 |
Campo de Hielo Patagónico Sur is the largest contiguous expanse of glacier ice outside the Antarctic and Greenland Ice Sheet, spanning the Andes Mountains across southern Chile and Argentina. The ice field feeds major outlet glaciers such as Perito Moreno Glacier, Pío XI Glacier, Upsala Glacier and Viedma Glacier, and drains into fjords, lakes and channels associated with the Pacific Ocean and Atlantic Ocean. It lies within a complex of protected areas including Los Glaciares National Park, Bernardo O'Higgins National Park, Tierra del Fuego National Park and adjoins watersheds linked to the Cape Horn region.
The ice field occupies a portion of the Andes between the Magallanes Region and Aysén Region in Chile and Santa Cruz Province in Argentina, bounded by the Golfo de Penas, Seno Aysén, Baker River, Lago Argentino and Lago Viedma. Major mountain massifs include the Cordillera Darwin, Monte San Valentín, Fitz Roy, Cerro Torre and the Sierra Nevada de Chaltén; nearby administrative divisions include Provincia de Última Esperanza, Provincia de Magallanes y la Antártica Chilena and the Departments of Deseado and Lago Argentino. The ice field's outlet glaciers sculpt fjords associated with the Beagle Channel, Sarmiento Channel, Canal Moraleda and the Strait of Magellan, influencing hydrology connected to the Baker River basin and the Santa Cruz River delta. Human settlements and logistics nodes in proximity include Punta Arenas, Puerto Natales, El Calafate, Coyhaique, Puyehue, Río Gallegos and Ushuaia.
Glaciological studies of the ice field reference concepts from Wilhelm Esmark-era mapping, ongoing surveys by the Servicio Nacional de Geología y Minería (SERNAGEOMIN), Instituto Antártico Chileno (INACH), the Instituto Geográfico Nacional (Argentina) and international teams from University of Alaska Fairbanks, University of Cambridge, University of Colorado Boulder and University of Buenos Aires. Outlet glaciers such as Perito Moreno Glacier exhibit surge behavior documented alongside Pío XI Glacier and Hielo Patagónico Norte comparisons, with mass balance assessed via GRACE satellite missions, Landsat time series, Copernicus Sentinel data and airborne campaigns by NASA. Ice dynamics involve basal sliding, crevasse formation and calving into Lago Argentino, fjords of Última Esperanza Sound and channels studied in journals linked to SCAR and the International Glaciological Society. The field's longitudinal flow interacts with orographic precipitation patterns controlled by the Pacific anticyclone and the Southern Westerlies.
Recent climatology links the ice field's retreat and occasional advances to shifts in the Southern Annular Mode, variability associated with the El Niño–Southern Oscillation, and trends observed by the World Meteorological Organization and regional climate centers in Chile and Argentina. Glacial mass loss documented since the late 20th century involves contributions to sea level rise reported by the Intergovernmental Panel on Climate Change and regional assessments involving CONAF and national research institutes. Studies by teams from University of Chile, Pontifical Catholic University of Chile, Universidad de Magallanes and CONICET link warming, altered precipitation, and atmospheric circulation changes to ice thinning, glacier frontal retreat and increased calving rates. Paleoclimate reconstructions using ice-core proxies, moraine mapping and dendrochronology tie episodes of advance to past Little Ice Age conditions and correlate recent trends with anthropogenic greenhouse forcing documented in the Paris Agreement science baselines.
The ice field interfaces with ecoregions recognized by WWF such as the Patagonian Andes rain forests and Magellanic subpolar forests, supporting downstream habitats for species protected under national and international instruments like CITES and the Ramsar Convention. Freshwater inputs sustain populations of native fishes including Galaxias maculatus and diadromous species that interact with estuaries near Seno Última Esperanza and Puerto Natales. Terrestrial fauna in adjoining parks include Guanaco, Andean condor, Huemul (South Andean deer), South American sea lion in coastal zones, and avifauna catalogued by institutions such as the Museo Nacional de Historia Natural (Chile) and Museo Argentino de Ciencias Naturales. Vegetation gradients progress from glacier forefields colonized by Nothofagus species through peatlands and freshwater marshes recognized by conservation NGOs like Conservación Patagónica.
Indigenous groups historically associated with southern Patagonia include the Aónikenk (Tehuelche), Kawésqar, Selk'nam (Ona) and Yaghan (Yámana), whose seasonal mobility, canoe cultures and place names persist in ethnographic records curated by institutions such as the Museo Regional de Magallanes and Museo del Fin del Mundo. Colonial-era exploration involved expeditions by Ferdinand Magellan, Francisco de Hoces-era navigators, 19th-century surveys by Falklands Survey-linked expeditions, and scientific voyages by Charles Darwin, Jean-Baptiste Charcot and later by Alberto de Agostini. Conflicts over borders and resource use engaged governments of Chile and Argentina leading to arbitration and treaties administered through ministries in Buenos Aires and Santiago.
Systematic mapping campaigns have been conducted by national agencies such as Instituto Geográfico Militar (Chile), Instituto Geográfico Nacional (Argentina), academic teams from University of Oxford, INSAR, and multinational projects supported by European Space Agency and NASA. Field stations in proximity include logistical hubs at El Calafate and camps used by mountaineers linked to clubs like the Alpine Club (UK), Federación Argentina de Ski y Andinismo and Club Andino Bariloche. Modern monitoring integrates satellite altimetry, GPS networks, and autonomous weather stations contributed by CONICET, SENAMHI-affiliated groups and private observatories; prominent researchers include teams publishing in Nature, Science, Journal of Glaciology and proceedings of IUGG.
Protection frameworks encompass Los Glaciares National Park, Bernardo O'Higgins National Park, designations under national laws of Chile and Argentina, and initiatives by NGOs including World Wildlife Fund and The Pew Charitable Trusts. Threats encompass accelerating glacier retreat linked to climate change, hydropower proposals affecting Baker River and Futaleufú River basins, tourism pressures in Perito Moreno access corridors, and extractive interests in adjacent ranges subject to Environmental Impact Assessment (Chile) and Ley de Glaciares (Argentina) debates. Binational cooperation mechanisms and research partnerships aim to balance conservation, indigenous rights advocates such as Consejo de Pueblos Indígenas and sustainable tourism managed by regional authorities in Magallanes and Santa Cruz Province.
Category:Glaciers of Chile Category:Glaciers of Argentina Category:Patagonia