亚澳季风与长江中游夏季降水的关联

THE RELATIONSHIPS BETWEEN JJA RAINFALL OVER THE MIDDLE REACHES OF THE YANGTZE RIVER AND THE ASIAN AND AUSTRALIAN MONSOON

分别用850 hPa风场、200 hPa风场、纬向风垂直切变、经向风垂直切变为左场,长江中游夏季(6—8月)降水场为右场,进行SVD分析。结果表明:亚澳季风环流与长江中游夏季降水密切相关,主导的亚澳季风环流与长江中游夏季降水的关系,依1月、4月、7月时间先后次序大致为亚洲冬季风偏弱(强),当年北澳夏季风偏弱(强)、北澳冬季风建立偏晚(早)、北澳冬季风偏弱(强),当年亚洲夏季风偏弱(强)→长江中游夏季降水偏多(少)。

The relationships between January,April,July monthly winds,vertical shears of zonal wind,vertical shears of meridional wind,and JJA rainfall over the middle reaches of the Yangtze River were studied with SVD.The results indicated that circulations of the monsoon and JJA rainfall over the middle reaches of the Yangtze River are closely related.Beginning from January to April and to July,a weak（strong） Asian winter monsoon is in association with a weak（strong） northern Australian summer monsoon,a late and weak（early and strong） northern Australia winter monsoon,and weak（strong） JJA rainfall over the middle reaches of the Yangtze River.