North American Monsoon Impacts Southern California's Coastal Low Clouds
North American Monsoon Impacts Southern California's Coastal Low Clouds
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DOI：
10.1029/2022gl102059
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发表时间：
2023-06
影响因子：
5.2
通讯作者：
R. Clemesha;S. Iacobellis;A. Gershunov;D. Cayan;I. Small;Tereza Cavazos
中科院分区：
文献类型：
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作者：
R. Clemesha;S. Iacobellis;A. Gershunov;D. Cayan;I. Small;Tereza Cavazos
低层层状云在温暖的季节调节加州的沿海气候。以前的工作描述的季节性和每日变化的沿海低云（CLC）表明，在7月，8月和9月南部加州的CLC的影响下，一个额外的驱动程序，这在北方加州的影响较小。在这项工作中，我们介绍了北美季风（NAM）过程所决定的自由对流层水分可以影响南加州CLC的联系。我们使用原位和遥感观测，以及再分析和单柱模型模拟，以确定和调查这个以前失踪的组件。我们发现，季风水分平流东南风流从核心NAM地区到南部加州减少云顶长波冷却CLC。为了增加一个已经复杂的酿造的已知因素影响沿海云量，另一个在此介绍，并应占在未来的工作。
Low‐level stratiform clouds modulate California's coastal climate during the warm season. Previous work describing the seasonal and daily variability of coastal low cloudiness (CLC) suggests that in July, August, and September southern California's CLC is under the influence of an additional driver, which has less impact in northern California. In this work, we introduce the link in which free‐tropospheric moisture dictated by North American Monsoon (NAM) processes can impact southern California CLC. We use in situ and remote sensing observations, as well as reanalysis and single column model simulations to identify and investigate this previously missing component. We find that monsoonal moisture advected by southeasterly flow from the core NAM region into southern California reduces CLC by diminishing cloud‐top longwave cooling. To add to an already complex brew of known factors influencing coastal cloudiness, another one is hereby introduced and should be accounted for in future work.