Sunnier skies driving Greenland surface melt

(Credit: (Nicolo E. DiGirolamo, SSAI/NASA GSFC, and Jesse Allen, NASA Earth Observatory))

In the past two decades, the Greenland ice sheet has become the biggest single contributor to rising sea levels, mostly from melt across its vast surface. That surface melt is, in turn, driven mostly by an uptick in clear, sunny summer skies, not just rising air temperatures, a new study finds.

What’s causing the decline in cloud cover isn’t yet clear, but the work shows that understanding what’s...

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