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Abrupt cloud clearing of marine stratocumulus in the subtropical southeast Atlantic
Science ( IF 56.9 ) Pub Date : 2018-07-19 , DOI: 10.1126/science.aar5836
Sandra E. Yuter 1 , John D. Hader 1, 2 , Matthew A. Miller 1 , David B. Mechem 3
Affiliation  

A shrinking marine refrigerator Low subtropical marine clouds scatter solar radiation back to space and thereby cool the climate system. Most work on understanding changes in the coverage of these types of clouds has focused on the effects of sea surface temperatures or on aerosols. Yuter et al. show that dynamic effects due to atmospheric gravity waves are responsible for the rapid clearing of large areas of these clouds. This phenomenon also has implications for marine ecology and biogeochemistry. Science, this issue p. 697 Atmospheric gravity waves can rapidly erode subtropical marine low cloud fronts. 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.

中文翻译:

大西洋东南亚热带海洋层积云的突然清云

缩小的海洋冰箱 低亚热带海洋云将太阳辐射散射回太空,从而冷却气候系统。大多数关于了解这些类型云覆盖范围变化的工作都集中在海面温度或气溶胶的影响上。尤特等人。表明大气重力波的动力效应是导致这些云的大面积快速清除的原因。这种现象也对海洋生态学和生物地球化学有影响。科学,这个问题 p。697 大气重力波可以迅速侵蚀亚热带海洋低云锋。我们记录了对全球辐射平衡和气候敏感性有影响的大部分亚热带海洋低云层的快速和突然清除。在东南大西洋上空,大面积的层积云被迅速侵蚀,沿着数百至数千公里长的陡峭过渡部分或完全清除,这些过渡以每秒 8 至 12 米的速度向西移动,距离非洲海岸 1000 多公里。西移云量减少在每年4-6月出现高峰。云侵蚀边界在不到 15 分钟的时间内以约 10 公里的尺度减少云,大致垂直于平均流移动,并且通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。沿着数百至数千公里长的陡峭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,距离非洲海岸 1000 多公里。西移云量减少在每年4-6月出现高峰。云侵蚀边界在不到 15 分钟的时间内以约 10 公里的尺度减少云,大致垂直于平均流移动,并且通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。沿着数百至数千公里长的陡峭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,距离非洲海岸 1000 多公里。西移云量减少在每年4-6月出现高峰。云侵蚀边界在不到 15 分钟的时间内以约 10 公里的尺度减少云,大致垂直于平均流移动,并且通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。大致垂直于平均流移动,并且通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。大致垂直于平均流移动,并且通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。
更新日期:2018-07-19
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