马斯克林高压对江淮地区梅汛期降水的影响

利用1951-2002年NCEP/NCAR再分析资料和中国160站月降水资料,分析了马斯克林高压对江淮梅雨期降水的影响.结果表明:当年4-5月马斯克林高压对6-7月江淮梅汛期降水的影响最大,江淮地区梅雨与前期春季马斯克林高压存在显著正相关关系,梅汛期的大气环流与春季马斯克林高压联系紧密,春季马斯克林高压偏强,则东亚夏季风偏强、副热带高压偏强、副高西脊点偏西、副高北界偏南,有利于江淮地区梅汛期降水增加;反之亦然.研究还表明,马斯克林高压对江淮南部地区梅汛期降水影响较大,对江淮北部不明显.

Influence of Mascarene High on Meiyu Precipitation in Changjiang-Huaihe Basin

Using the NCEP/NCAR!reanalyzing data and monthly rainfall data at 160 stations in China from 1951 to 2002,this paper analyzes the influence of the variation of Mascarene high(MH) on Meiyu in the Changjiang-Huaihe basin from 1951 to 2002.Results show that MH in April-May impacts Meiyu precipitation in the Changjiang-Huaihe basin most.There is a strong positive correlation between Mascarene high in spring and Meiyu precipitation in the Changjiang-Huaihe basin,while there is a close correlation between MH in spring and atmospheric circulation systems in summer.When the April-May MH is stronger,the East Asian summer monsoon is stronger,and the Western Pacific subtropical high tends to be intensified with a more southwestward position which result in more rainfall in the Changjiang-Huaihe basin,and vice versa.Further analysis indicates that the influence of MH is stronger in the south of the Changjiang-Huaihe basin than in the north.The results are of benefit to the prediction of Meiyu precipitation in the Changjiang-Huaihe basin.