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Inventory of glaciers in isla Riesco, Patagonia, Chile, based on aerial photography and satellite imagery

  • Gino Casassa (a1) (a2), Katrine Smith (a1) (a3), Andrés Rivera (a2) (a4), José Araos (a4), Michael Schnirch (a5) and Christoph Schneider (a5)...

Abstract

A glacier inventory for península Córdova, isla Riesco, Chilean Patagonia (53°14’ S, 73°00’W), has been compiled based on stereoscopic interpretation of aerial photographs of March and December 1984 and 1:100 000 topographic maps. Three small icefields comprising 33 glacier outlets, in addition to 12 small separate glaciers, have been identified, with a total area of 57 km2. Glaciers are located on mountain peaks with a maximum altitude of 1183 mand a lowermost elevation of 100 m. All glaciers terminate on land, except for three glaciers calving into small fresh-water lakes. A Landsat Thematic Mapper (TM) image of 6 October 1986 has been rectified and analyzed using a supervised classification to estimate snow- and glacier-covered surfaces. Glacier-area data derived from satellite-image analyses have been adjusted at península Córdova using photo-interpreted data, and extrapolated to estimate a glacier area of 215 ±40km2 for all of isla Riesco. The presence of trimlines and moraines beyond the present position of the glaciers indicates a generalized retreat from a maximum neoglacial position at península Córdova, most probably as a result of regional warming and precipitation decrease observed during the last century.

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References

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Inventory of glaciers in isla Riesco, Patagonia, Chile, based on aerial photography and satellite imagery

  • Gino Casassa (a1) (a2), Katrine Smith (a1) (a3), Andrés Rivera (a2) (a4), José Araos (a4), Michael Schnirch (a5) and Christoph Schneider (a5)...

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