A new study highlights how a stream of warm, moist air caused excessive melting over Greenland in 2021, an increasingly common occurrence over the past decade.
In Greenland, these warm rivers in the sky also play a role in melting the ice sheet. In a study, Box and his colleagues illuminate how an atmospheric river caused the August 2021 melt event and brought rain to the summit. The explanation foretells a future that could be increasingly common as global temperatures rise due to human-caused climate change.
As an atmospheric river landed over Greenland in August, the study found the majority of melt resulted from elevated air temperatures, which darkened the ice sheet surface and increased the absorption of sunlight. Satellite data showed melting snow crept up to higher elevations and exposed relatively dark bare ice. Where snow remained, surface melting deformed the snow crystals and made them darker, which led to additional melting under sunny skies in the following days.
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