Observed Relationships between Cloud Vertical Structure and Convective Aggregation over Tropical Ocean
Observed Relationships between Cloud Vertical Structure and Convective Aggregation over Tropical Ocean
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DOI：
10.1175/jcli-d-16-0125.1
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发表时间：
2017-03
影响因子：
4.9
通讯作者：
T. Stein;C. Holloway;I. Tobin;S. Bony
中科院分区：
文献类型：
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作者：
T. Stein;C. Holloway;I. Tobin;S. Bony
摘要：利用卫星红外简单对流聚集指数（SCAI）确定聚集程度，在10度空间尺度上合成CloudSat-CALIPSO 5年的云剖面，研究云垂直结构与聚集的关系。对于给定的大尺度垂直运动和域平均降水率，随着聚集的增加，砧云（以及整体云量）大幅减少，晴空和低云增加。厚砧云的变化与240 K以下亮温的总面积覆盖[冷云面积(CCA)]的变化成正比，与SCAI呈负相关。当聚集增加时，即使对于固定的 CCA，光学薄砧覆盖也会显着减少，这支持了先前关于聚集对流具有更高沉淀效率的发现。卷云、浓云和中层云与聚集程度没有表现出一致的关系。激光雷达观测...
AbstractUsing the satellite-infrared-based Simple Convective Aggregation Index (SCAI) to determine the degree of aggregation, 5 years of CloudSat–CALIPSO cloud profiles are composited at a spatial scale of 10 degrees to study the relationship between cloud vertical structure and aggregation. For a given large-scale vertical motion and domain-averaged precipitation rate, there is a large decrease in anvil cloud (and in cloudiness as a whole) and an increase in clear sky and low cloud as aggregation increases. The changes in thick anvil cloud are proportional to the changes in total areal cover of brightness temperatures below 240 K [cold cloud area (CCA)], which is negatively correlated with SCAI. Optically thin anvil cover decreases significantly when aggregation increases, even for a fixed CCA, supporting previous findings of a higher precipitation efficiency for aggregated convection. Cirrus, congestus, and midlevel clouds do not display a consistent relationship with the degree of aggregation. Lidar-ob...