On the crucial role of atmospheric rivers in the two major Weddell Polynya events in 1973 and 2017 in Antarctica.

On the crucial role of atmospheric rivers in the two major Weddell Polynya events in 1973 and 2017 in Antarctica.
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DOI:
10.1126/sciadv.abc2695
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发表时间:
2020-11
期刊:
影响因子:
13.6
通讯作者:
Heil P
Heil P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Francis D;Mattingly KS;Temimi M;Massom R;Heil P

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大气河流引起海冰融化,并引发了 1973 年 11 月和 2017 年 9 月的两次大型威德尔冰间湖事件。本研究报告了 1973 年 11 月和 2017 年 9 月两次大型威德尔冰间湖事件期间强烈大气河流 (AR) 的发生,并通过其促进海冰融化来调查它们在开幕事件中的作用。在冰间湖开放前几天,持续的 AR 在地表保持持续的正总能量通量,导致莫德海隆地区海冰变薄和海冰浓度下降。 AR 与异常高的总降水量和云液态水含量相关,超过气候平均值 3 个标准差。高于正常水平的综合水汽输送(IVT高于第99个气候百分位数)以及不透明云带,通过向下长波辐射和暖气团平流的大幅增加(+250 W m−2)使地表变暖(皮肤和空气温度+10°C),导致海冰融化并抑制夜间再结冰。
Atmospheric rivers induced sea ice melt and initiated the two major Weddell Polynya events in November 1973 and September 2017. This study reports the occurrence of intense atmospheric rivers (ARs) during the two large Weddell Polynya events in November 1973 and September 2017 and investigates their role in the opening events via their enhancement of sea ice melt. Few days before the polynya openings, persistent ARs maintained a sustained positive total energy flux at the surface, resulting in sea ice thinning and a decline in sea ice concentration in the Maud Rise region. The ARs were associated with anomalously high amounts of total precipitable water and cloud liquid water content exceeding 3 SDs above the climatological mean. The above-normal integrated water vapor transport (IVT above the 99th climatological percentile), as well as opaque cloud bands, warmed the surface (+10°C in skin and air temperature) via substantial increases (+250 W m−2) in downward longwave radiation and advection of warm air masses, resulting in sea ice melt and inhibited nighttime refreezing.
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发表时间: 2017-12-16
影响因子: 5.2
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