COLA AGCM simulation of the effect of anomalous spring snow over Eurasia on the Indian summer monsoon

被引:33
作者
Bamzai, AS [1 ]
Marx, L [1 ]
机构
[1] Ctr Ocean Land Atmosphere Studies, Calverton, MD USA
关键词
Asian summer monsoon; general-circulation model; interannual variability;
D O I
10.1002/qj.49712656811
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The ability of the Center for Ocean-Land-Atmosphere Studies Atmospheric General Circulation Model to capture the inverse snow-monsoon relation observed in satellite-derived data is tested. The effect of initial enhanced and reduced spring Eurasian snow mass on the evolution of the subsequent Indian summer monsoon is examined through 11-member ensemble integrations from 1 March to 1 October The results of the sensitivity experiment indicate that remote responses from the snow-mass anomalies include significant changes in the sensible-heat flux, latent-hear flux and sea level pressure, leading to changes in summer precipitation over the land mass of the Indian subcontinent. Fur the pre-monsoon season, the ensemble average of the temperature of the atmospheric column for enhanced snow mass is anomalously colder over large-scale regions of the Eurasian continent compared with the ensemble average for the reduced snow mass. Low-level south-westerlies associated with monsoonal circulation are increased. The results indicate the importance of land-surface processes in the evolution of the monsoon circulation and lend hope to the use of Eurasian spring snow mass towards improved forecasting of the summer monsoon.
引用
收藏
页码:2575 / 2584
页数:10
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