NASAのインスタグラム(nasagoddard) - 8月6日 11時10分

The Perito Moreno Glacier is one of the largest in Patagonia at 30 kilometers long. The glacier descends from the Southern Patagonian Icefield (image top)—2100 meters elevation (6825 feet) in the Andes Mountains—down into the water and warmer altitudes of Lago Argentino at 180 meters above sea level. Note: In this photograph from astronauts on the International Space Station, the image is rotated so that north is to the right. Perito Moreno is perhaps the region’s most famous glacier because it periodically cuts off the major southern arm (known as Brazo Rico) of Lake Argentino. The glacier advances right across the lake until it meets the opposite shoreline, and the ice tongue is “grounded” (not floating) so that it forms a natural dam. The ice dam prevents lake water from circulating from one side to the other, which in turn causes muddier and “milkier” water to concentrate in Brazo Rico. Water flows down under the glacier from the mountains, not only carrying the mud into the lake but also helping lubricate the glacier’s downhill movement.

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