NASAのインスタグラム(nasa) - 11月5日 02時27分

Upsala Glacier Retreat: Taken from the International Space Station, this photo highlights the snout of the Upsala Glacier on the Argentine side of the North Patagonian Icefield. Ice flow in this glacier comes from the north (right in this rotated image). Dark lines of rocky debris (moraine) within the ice give a sense of the slow ice flow from right to left.

A smaller, side glacier joins Upsala at the present-day ice front -- the wall from which masses of ice periodically collapse into Lago (Lake) Argentino. In this image, the 2.7 kilometer-wide ice front casts a thin, dark shadow. The surface of Lago Argentino is whitened by a mass of debris from a recent collapse of the ice wall. Larger icebergs appear as white dots on the lake surface at image left.

The water color in Lago Argentino is related to the glacier flow. The lake receives most of the ice from the glacier and thus receives most of the “rock flour” -- rocks ground to white powder by the ice scraping against the rock floor of the valley. Glacial flour turns the lake a gray-green hue in this image. The darker blue of the smaller lakes (image bottom) indicates that they are receiving much less rock flour.

This image was taken on Oct. 2, 2013 by an astronaut on the space station, with a Nikon D3 digital camera using a 300 millimeter lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. It has been cropped and enhanced to improve contrast, and lens artifacts have been removed.

Image Credit: NASA; Caption: M. Justin Wilkinson, Jacobs at NASA-Johnson Space Center
#nasa #iss #space #astronaut #astropix #earth #glaciers #upsala #argentina #patagonia

[BIHAKUEN]UVシールド(UVShield) 更年期に悩んだら

>> 飲む日焼け止め！「UVシールド」を購入する