Frank Jordans/AP German Arctic research vessel Polarstern is docked for maintenance in Bremerhaven, Germany, July 3, 2019.

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From the start...

Photo by Lianna Nixon, CIRES/CU Boulder

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After...

Known as Miss Piggy, the weather balloon collects data within the few thousand feet of atmosphere above the ice. Graeser wears a red snowsuit, and the ship Polarstern is visible in the distance. December 12, 2019. Photo: Esther Horvath

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The high Arctic...

Credit: Stefan Hendricks

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Most of the crew...

Ice in the Arctic

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The Arctic continued...