The sensitivity of climate simulations to the specification of mixed phase clouds

被引:81
作者
Gregory, D
Morris, D
机构
[1] HADLEY CTR CLIMATE PREDICT & RES,METEOROL OFF,BRACKNELL RG12 2SY,BERKS,ENGLAND
[2] UMIST,ATMOSPHER PHYS RES GRP,MANCHESTER M60 1QD,LANCS,ENGLAND
关键词
D O I
10.1007/s003820050133
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
In the prognostic stratiform cloud scheme used in the UK Meteorological Office Unified Model, mixed phase clouds are assumed tb exist between 0 and -15 degrees C, Recent observations of such clouds, carried out using the C-130 aircraft of the Meteorological Research Flight, suggest that a smaller range of 0 to -9 degrees C may be more appropriate, The sensitivity of cloud and radiation fields as simulated by a 5 x 7.5 degrees latitude-longitude version of the Unified Model to such a reduction in the temperature range of mixed phase clouds is considered. Using a smaller temperature range systematic errors in the radiation budget of the model are reduced in mid-latitudes, bringing the model into closer agreement with ERBE data, The sensitivity of model albedo to an increase in the temperature range over which mixed phase clouds are assumed to exist, suggested by previous observational studies, is also considered together with the impact of removing the mixed phase part of the precipitation parametrization altogether.
引用
收藏
页码:641 / 651
页数:11
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