Parametrization of momentum transport by convection .2. Tests in single-column and general circulation models

被引:223
作者
Gregory, D [1 ]
Kershaw, R [1 ]
Inness, PM [1 ]
机构
[1] METEOROL OFF,BRACKNELL,BERKS,ENGLAND
关键词
cloud-resolving model; cross-cloud pressure-gradient; deep convection; general circulation model; mass-flux parametrization; momentum flux; single-column model;
D O I
10.1002/qj.49712354103
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Diagnostics derived from cloud-resolving-model simulations in part I of this study, relating to the vertical transport of horizontal momentum by convection, are used to develop a parametrization of convective momentum-transports for deep convection based upon the mass-flux convection-scheme discussed by Gregory and Rowntree. The importance of cloud pressure-gradients to the flow within the cloud is emphasised, and a simple method of representing their effect is suggested. The scheme is able to reproduce the fluxes derived from the cloud-resolving model studies where cloud organization by the flow is unimportant. Inclusion of the parametrization in a version of the Meteorological Office Unified Model demonstrates that convective momentum-transports play a large role in the momentum balance of the atmosphere. Generally, simulation of the mean atmospheric circulation by the Unified Model is improved by the inclusion of such transports.
引用
收藏
页码:1153 / 1183
页数:31
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