ナショナルジオグラフィックのインスタグラム(natgeo) - 3月1日 22時54分

Photograph by George Steinmetz @geosteinmetz/@thephotosociety Lake Vanda in Wright Valley has what is said to be the clearest ice in the world. The lake water is almost completely chlorophyl and sediment free, and transports light only 10% less than distilled water. While walking across the ice I could see the bottom through solid ice some 7 meters below as if I was looking through a glass-top table. At the lake center the bottom is 65m down and the bottom water is hyper saline. This salty (10x saltier than sea water) layer traps heat and keeps the bottom water and 25°C year-round, and supports lots of bacteria which live off the incoming sunlight. To see more photos from Antarctica visit @geosteinmetz

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