ナショナルジオグラフィックのインスタグラム(natgeo) - 11月13日 04時35分

Photo by @acacia.johnson | Light seeps through a crack in the roof of an ice cave in Alaska's Arctic National Wildlife Refuge. Known as "aufeis," this unique type of river ice— which can sometimes cover rivers year-round—is found in parts of Alaska, Russia, Mongolia, and Arctic Canada. I discovered this cave on an expedition to Alaska's Arctic with my father, and I was learning to use a 4x5 film camera. We later heard that Alaska's aufeis has dramatically decreased with warming temperatures in the past few decades—one of many changes I have witnessed in my home of Alaska during my lifetime. Follow me at @acacia.johnson for more stories from Alaska, the Arctic, and beyond. #alaska #aufeis #arcticnationalwildliferefuge

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