A model shows the eastern ice sheet gained 69 gigatons because of snow, while rare downpours and melting occurred near the coast.
Satellite imagery and computer models indicate significant snow, rain and melting also occurred. During the heat wave, the ice sheet experienced its fourth-wettest day in more than four decades, according to the Modèle Atmosphérique Régionale , a regional climate model that studies the melting of the polar ice caps.
“That would be tremendous for that area,” said Jonathan Wille, a researcher studying polar meteorology at Grenoble Alpes University in France. “It doesn’t even rain here almost ever. Normally they have like a few millimeters of rain per year. And it’s March — it should be getting cold.” The precipitation occurred when circulation patterns around Antarctica directed a very strong atmospheric river, or strip of moist air, into the eastern coastline of the continent on March 15. Atmospheric rivers typically drop“Moisture intrusion events and atmospheric rivers, they do happen, but this is just to a different degree of intensity,” Wille said. He said the duration and intensity of the event were greater than scientists would normally expect.
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