Before and After
Patagonia Glacier retreat, Chile
September 18, 1986 – August 5, 2002
CurtainToggle Image Details Patagonia, Chile. Left: September 18, 1986. Right: August 5, 2002. The 1986 image shows the region prior to a major retreat of the glaciers. The 2002 image shows a retreat of nearly 10 kilometers (6.2 miles) of the glacier on the left side. The smaller glacier on the right has receded more than 2 kilometers (1.2 miles). In front of the smaller glacier, two ribbon lakes have formed behind the debris left by the glacier’s advance. Scientists and government managers are using satellite imagery like this to monitor the retreat of the glaciers and the impact on water bodies caused by the changes in the glaciers’ size and direction. Left image taken by the Thematic Mapper sensor onboard Landsat 5. Right image taken by the Enhanced Thematic Mapper Plus sensor onboard Landsat 7. Source: USGS Landsat Missions Gallery, “Patagonia Region – Retreating Glaciers,” U.S. Department of the Interior / U.S. Geological Survey.Downloads
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