Observational validation of the compensating mass flux through the shell around cumulus clouds

被引：47

作者：

Heus, Thijs ^{[1
,2
]}

Pols, C. Freek J. ^{[1
]}

Jonker, Harm J. J. ^{[1
]}

Van den Akker, Harry E. A. ^{[1
]}

Lenschow, Donald H. ^{[3
]}

机构：

[1] Delft Univ Technol, Dept Multi Scale Phys, NL-2600 GA Delft, Netherlands

[2] Royal Netherlands Meteorol Inst, NL-3730 AE De Bilt, Netherlands

[3] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

来源：

QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY | 2009年 / 135卷 / 638期

关键词：

cumulus clouds; aeroplane observations; large-eddy simulations; mass flux; downdraughts; ENVIRONMENT INTERFACE INSTABILITY; SHALLOW CUMULUS; ENTRAINMENT;

D O I：

10.1002/qj.358

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

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 (C) 2008 Royal Meteorological Society

引用

页码：101 / 112

页数：12

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