More frequent atmospheric rivers slow the seasonal recovery of Arctic sea ice
More frequent atmospheric rivers slow the seasonal recovery of Arctic sea ice
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DOI：
10.1038/s41558-023-01599-3
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发表时间：
2023-02
影响因子：
30.7
通讯作者：
Pengfei Zhang;Gang Chen;M. Ting;L. Ruby Leung;B. Guan;Laifang Li
中科院分区：
文献类型：
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作者：
Pengfei Zhang;Gang Chen;M. Ting;L. Ruby Leung;B. Guan;Laifang Li
近几十年来，北极海冰覆盖率在冬季急剧下降，预计海冰将在融化季节后恢复。目前还不清楚大气过程，如大气河流（AR），密集的水分运输走廊，在多大程度上有助于减少海冰的恢复。在这里，使用观测和气候模型模拟，我们发现在1979-2021年，在巴伦支-卡拉海和北极中部的初冬，AR的频率增加。更频繁的AR携带的水分加强了地表向下的长波辐射和降雨，导致薄而脆弱的冰盖融化，减缓了海冰的季节性恢复，占巴伦支海-卡拉海和北极中部海冰覆盖下降的34%。一系列的模式集合实验表明，除了一个统一的AR增加响应人为变暖，热带太平洋的变化也有助于观察到的北极AR的变化。
In recent decades, Arctic sea-ice coverage underwent a drastic decline in winter, when sea ice is expected to recover following the melting season. It is unclear to what extent atmospheric processes such as atmospheric rivers (ARs), intense corridors of moisture transport, contribute to this reduced recovery of sea ice. Here, using observations and climate model simulations, we find a robust frequency increase in ARs in early winter over the Barents–Kara Seas and the central Arctic for 1979–2021. The moisture carried by more frequent ARs has intensified surface downward longwave radiation and rainfall, caused stronger melting of thin, fragile ice cover and slowed the seasonal recovery of sea ice, accounting for 34% of the sea-ice cover decline in the Barents–Kara Seas and central Arctic. A series of model ensemble experiments suggests that, in addition to a uniform AR increase in response to anthropogenic warming, tropical Pacific variability also contributes to the observed Arctic AR changes.