ナショナルジオグラフィックのインスタグラム(natgeo) - 2月13日 15時51分

Photo by @shonephoto (Robbie Shone) - Mountain regions respond sensitively to climate change. Taking advantage of Alpine caves, a team of scientists led by Swiss Paleoclimatologist Dr. Marc Luetscher from the Swiss Institute for Speleology and Karst Studies (SISKA), is working to understand how permafrost has evolved through time. Ice caves form through a combination of snow intrusion and/or congelation of water infiltrating a karst system. Often up to several centuries old, the climate record of this ice remains largely under-studied. Today we are also able to tell if a cave was an ice cave in the past. This is achieved by looking for cryogenic cave calcites. These form when water enters a cave, and freezes and turns to ice. In this process, the water becomes progressively enriched in ions to the point that it becomes super-saturated and precipitates calcite.
Here is a panoramic view of the mountainous region of Austria where many of the ice caves that Dr. Marc Luetscher uses as his field sites can be found. As the sun sets, the valleys around Altaussee and the Austrian Alps are drenched in beautiful warm pink light. @natgeocreative

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