ナショナルジオグラフィックのインスタグラム(natgeo) - 10月24日 19時44分

Video by @estherhorvath / Arctic sea ice can be several years old before it melts. In the 1980s, 70% of the Arctic Ocean was covered with ice older than a year, called multiyear ice. Today, it's just 30%—because most melts during its first summer. According to climate models, the Arctic Ocean in summer may be ice free before 2035. To monitor the state of rapidly changing sea ice in the Arctic, the Alfred Wegener Institute conducts airborne surveys twice a year. The flights are done at an altitude of 200 feet (about 60m) while towing a torpedo-like instrument called “Bird." It measures the ice thickness with electromagnetic and laser technology. Surveys are carried out in close collaboration with other international projects: the European Space Agency’s Cryosat Validation Experiments (CryoVEx) and NASA’s Operation Icebridge (OIB). Please follow @estherhorvath for polar science documentaries and @awiexpeditions for polar research.

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