Stefan Christmann / Moon bow, a halo around the moon during polar night. Sastrugi on sea ice in foreground. Atka Bay, Antarctica. June.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) walking across crack in sea ice during return to breeding colony. Atka Bay, Antarctica. April.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) sliding across sea ice in journey to breeding colony. Sastrugi in ice formed by wind erosion. Atka Bay, Antarctica. April.
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Bryan and Cherry Alexander / Sastrugi, wind carved patterns in the snow, on snow covered winter tundra at sunset. Chukotskiy Peninsula, Chukotka, Siberia, Russia.
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Stefan Christmann / Formations in sea ice at full moon, during polar night. Atka Bay, Antarctica. July 2017.
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Stefan Christmann / Formations in sea ice at full moon, during polar night. Atka Bay, Antarctica. July 2017.
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Stefan Christmann / Sastrugi formation on sea ice, at first light, at the end of polar night. Atka Bay, Antarctica. July 2017.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group returning across sea ice to form breeding colony. Atka Bay, Antarctica. April 2017.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), three sliding across sea ice on return to form breeding colony. Atka Bay, Antarctica. April.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group returning across sea ice to form breeding colony. Atka Bay, Antarctica. April 2017.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), scattered groups on sea ice, returning to form breeding colony. Atka Bay, Antarctica. April 2017.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), group walking across sea ice to form breeding colony. Atka Bay, Antarctica. April 2017.
