Anna Liljedahl

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Thermokarst ponds, or trough ponds, typically form when the ice in permafrost melts. They can also drain quickly. Anna Liljedahl

Disappearing lakes and AI are helping scientists map Arctic permafrost thaw in near‑real time

Anna Liljedahl, University of Alaska Fairbanks and Ingmar Nitze, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research

The abrupt disappearance of a lake is one clear sign that the ice below is melting, and a clue to wider permafrost changes.

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