Increasing Multiyear Sea Ice Loss in the Beaufort Sea: A New Export Pathway for the Diminishing Multiyear Ice Cover of the Arctic Ocean
Increasing Multiyear Sea Ice Loss in the Beaufort Sea: A New Export Pathway for the Diminishing Multiyear Ice Cover of the Arctic Ocean
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波弗特海多年海冰流失加剧：北冰洋多年冰盖减少的新出口途径
DOI：
10.1002/essoar.10509833.1
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Babb D
中科院分区：
文献类型：
--
作者：
Babb D
历史上，多年海冰（MYI）覆盖了北极的大部分地区，并通过博福特环流多年。然而，21世纪初博福特海的冰融化增加被认为切断了这一环流。构建1997年至2021年的区域MYI预算显示，MYI输入博福特海全年都在增加，但现在夏季存活并在环流中向前运输的MYI较少。在研究期间，年平均MYI损失增加了四倍，从弗拉姆海峡MYI出口的1.7%增加到1.33%，而2018年的峰值（385，000平方公里）与弗拉姆海峡MYI出口的幅度相似。冰-冰反馈加上向更年轻更薄的MYI过渡是MYI损失增加的原因。MYI通过博福特环流的运输还没有被切断，但它已经严重减少，以防止它在整个北冰洋重新分配。
Historically, multiyear sea ice (MYI) covered a majority of the Arctic and circulated through the Beaufort Gyre for years. However, increased ice melt in the Beaufort Sea during the early 2000s was proposed to have severed this circulation. Constructing a regional MYI budget from 1997 to 2021 reveals that MYI import into the Beaufort Sea has increased year‐round, yet less MYI now survives through summer and is transported onwards in the Gyre. Annual average MYI loss quadrupled over the study period and increased from ∼7% to ∼33% of annual Fram Strait MYI export, while the peak in 2018 (385,000 km2) was similar in magnitude to Fram Strait MYI export. The ice‐albedo feedback coupled with the transition toward younger thinner MYI is responsible for the increased MYI loss. MYI transport through the Beaufort Gyre has not been severed, but it has been reduced so severely to prevent it from being redistributed throughout the Arctic Ocean.
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