Abrupt cloud clearing of marine stratocumulus in the subtropical southeast Atlantic

Abrupt cloud clearing of marine stratocumulus in the subtropical southeast Atlantic
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副热带东南大西洋海洋层积云的突然消云

DOI:
10.1126/science.aar5836
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发表时间:
2018
期刊:
影响因子:
56.9
通讯作者:
Mechem, David B.
Mechem, David B.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yuter, Sandra E.;Hader, John D.;Miller, Matthew A.;Mechem, David B.

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我们记录了大部分亚热带海洋低云甲板的快速和突然的清除,这对全球辐射平衡和气候敏感性有影响。在大西洋东南部,大面积的层积云被迅速侵蚀,沿着数百至数千公里长的急剧过渡产生部分或完全清除,这些过渡以每秒8至12米的速度向西移动,并从非洲海岸移动1000多公里。向西移动的云量减少在4月至6月期间有一个年度高峰。云侵蚀边界在不到15分钟的时间内减少了10公里尺度的云,大致垂直于平均气流移动,并且经常伴随着小尺度的波浪特征。观测表明,云侵蚀是由大气重力波引起的。
We document rapid and abrupt clearings of large portions of the subtropical marine low cloud deck that have implications for the global radiation balance and climate sensitivity. Over the southeast Atlantic, large areas of stratocumulus are quickly eroded, yielding partial or complete clearing along sharp transitions hundreds to thousands of kilometers in length that move westward at 8 to 12 meters per second and travel as far as 1000+ kilometers from the African coast. The westward-moving cloudiness reductions have an annual peak in occurrence in the period from April through June. The cloud erosion boundaries reduce cloud at ≈10-kilometer scale in less than 15 minutes, move approximately perpendicular to the mean flow, and are often accompanied by small-scale wave features. Observations suggest that the cloud erosion is caused by atmospheric gravity waves.
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DOI: 10.1038/250447b0
发表时间: 1974
期刊: Nature
影响因子: 64.8
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