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| Andean glaciers | |
|---|---|
| Name | Andes glaciers |
| Location | Andes |
| Length | variable |
| Area | variable |
| Status | retreating |
Andean glaciers are the high-mountain ice masses that occupy peaks and plateaus along the Andes mountain range of South America. They influence regional El Niño–Southern Oscillation-linked climate, supply meltwater to major river basins such as the Amazon River and the Río de la Plata, and are integral to cultural landscapes in countries including Chile, Peru, Bolivia, Argentina, Ecuador and Colombia. Scientific and policy communities from institutions like the Smithsonian Institution, Intergovernmental Panel on Climate Change, World Bank and United Nations engage with glacier research, management, and adaptation.
Andes glaciers occur from the tropics near Quito and Bogotá to the subtropics in Mendoza and the temperate zones of Patagonia near Punta Arenas, spanning provinces and regions such as Atacama Region, Ancash Region, Puno Region, La Paz Department, Jujuy Province and Aysén Region. Major glaciated complexes include the ice fields of Northern Patagonian Ice Field, Southern Patagonian Ice Field, the ice caps around Nevado Huascarán, Nevado Sajama, Nevado Illimani, Chimborazo and Cotopaxi. Elevation controls distribution with glaciers tied to the Tropical Andes belt, the Central Andes, and the Southern Andes, influencing basins of the Marañón River, Moche River, Bío Bío River, and transboundary waters feeding the La Plata Basin.
Glacier formation in the Andes begins with accumulation zones on peaks such as Huascarán and Aconcagua where snowfall exceeds ablation, creating firn and compacting into ice. Physical types include valley glaciers, cirque glaciers, rock glaciers, ice caps, and hanging glaciers found on mountains like Chañi and Huayna Potosí; periglacial features occur near Salar de Uyuni. Morphology is shaped by bedrock geology of the Andean orogeny, tectonics linked to the Nazca Plate subduction beneath the South American Plate, and volcanic environments at Ojos del Salado and San José. Crevasses, seracs and moraines record dynamics studied at sites including Llanganuco, Pastoruri, Puncak Jaya (for comparative tropical studies) and Viedma Glacier.
Regional warming tied to greenhouse forcing assessed by the Intergovernmental Panel on Climate Change and monitored by agencies like NASA, NOAA and European Space Agency has accelerated retreat, with landmark observations at Glacier Pastoruri, the Quelccaya Ice Cap, Blanco River Glacier and the Huascarán Massif. Interannual variability driven by El Niño–Southern Oscillation and Pacific Decadal Oscillation modulates mass balance, while long-term trends mirror global cases documented in IPCC Special Reports. Socio-political responses involve national plans from Peru and Chile and international funding from World Bank and Green Climate Fund to manage impacts on hydropower projects like those by Endesa, Enel, Electroperú and Empresa Nacional del Petróleo.
Glacial melt sustains dry-season flows for metropolitan centers including Lima, Santiago, La Paz and Cusco and contributes to irrigation in valleys such as the Cañete Valley, Ica Valley and Maipo Valley. Water infrastructure interacting with glaciers includes reservoirs at Melones Dam, irrigation networks tied to Irrigation Districts in Arequipa and hydropower installations like BHU Bayán, Rucúe, and projects by Eletrobras and AES Corporation. Changes in seasonal runoff affect transboundary water governance among Peru and Ecuador, Bolivia and Chile, necessitating adaptation in municipal utilities like SEDAPAL and Aguas Andinas.
Glacial-fed headwaters support páramo and puna ecosystems, high-Andean wetlands (bofedales) hosting species such as the Andean condor, vicuña, llama, alpaca and plants in the family Polylepis and genera like Puya and Azorella. Aquatic habitats downstream sustain amphibians including species described by researchers at the Field Museum and the Natural History Museum, London, and endemic fish in basins cataloged by the IUCN. Glacial retreat alters thermal and sediment regimes, affecting communities documented in studies by Conservation International, World Wildlife Fund and national parks like Huascarán National Park, Los Glaciares National Park, Sangay National Park and Cotopaxi National Park.
Glaciers hold spiritual and cultural significance for Indigenous groups such as the Quechua, Aymara, Kichwa, Mapuche and communities around Cusco and Lake Titicaca. Archaeological and ritual sites near glaciated peaks—investigated by teams from Harvard University, University of Cambridge, National Geographic Society and Pontifical Catholic University of Peru—include offerings and mummies on summits like Llullaillaco. Economically, glaciers underpin tourism economies in Bariloche, Huaraz, El Chaltén and ski areas near Santiago, and influence mining water use by firms such as Anglo American, BHP, Glencore and national mining agencies.
Monitoring employs satellite missions from Landsat, Sentinel-2, ICESat-2, airborne campaigns by NASA, in situ mass-balance studies led by universities like Universidad Nacional Mayor de San Marcos, University of Chile and research centers such as the International Centre for Integrated Mountain Development and Institute of Arctic and Alpine Research. Conservation actions integrate protected area management in UNESCO World Heritage Sites and climate adaptation planning through collaborations among UNEP, FAO, IADB and national ministries of environment. Citizen science and community monitoring initiatives partner with NGOs like The Nature Conservancy and local municipalities to inventory glaciers using protocols from the Global Terrestrial Network for Glaciers.
Category:Glaciers of South America