Observational validation of the compensating mass flux through the shell around cumulus clouds
Observational validation of the compensating mass flux through the shell around cumulus clouds
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DOI：
10.1002/qj.358
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发表时间：
2009
影响因子：
8.9
通讯作者：
T. Heus;C. Freek J. Pols;Harm J. J. Jonker-Harm-J.-J.-Jonker-2159973995;Harry E. A. Van den Akker;Donald H. Lenschow
中科院分区：
文献类型：
--
作者：
T. Heus;C. Freek J. Pols;Harm J. J. Jonker-Harm-J.-J.-Jonker-2159973995;Harry E. A. Van den Akker;Donald H. Lenschow
在几次飞机测量活动中，以前已经观察到积云周围存在下沉壳。大涡模拟（LES）的最新结果表明，通过壳层的向下质量通量补偿了通过云的向上质量通量的很大一部分。在这项研究中，飞机测量积云在海洋（RICO）领域的运动来验证这种补偿质量通量的存在。正如大涡模拟的结果一样，壳内向下的质量通量也很重要。然而，与LES结果相比，发现了一些差异;其中大部分是通过考虑LES中的二维平板与飞机观测的一维线之间的差异来解释的。版权所有© 2008皇家气象学会
The existence of a subsiding shell around cumulus clouds has been observed before in several aircraft measurement campaigns. Recent results from large‐eddy simulations (LES) showed that the downward mass flux through the shell compensates for a significant fraction of the upward mass flux through the cloud. In this study, aeroplane measurements from the Rain In Cumulus over the Ocean (RICO) field campaign are used to verify the existence of this compensating mass flux. Just as in the LES results, the in‐shell downward mass flux is found to be significant. However, a few differences were found in comparison with the LES results; most of them were explained by taking into account the difference between the two‐dimensional slabs in LES and the one‐dimensional lines from aeroplane observations. Copyright © 2008 Royal Meteorological Society