南海和青藏高原TBB的低频振荡与湖北省“二度梅”的关系

通过利用1991～2003年闽南地区的酸雨资料和天气图进行分析,结果表明:在闽南地区有近一半的降水出现酸雨。春冬季酸雨出现率大,秋季最小。与锋面伴随的850 hPa冷槽型、暖式切变型和冷式切变型,酸雨出现率大,倒槽型最小。在倒槽型的槽后酸雨出现率明显比槽前多出2倍多。pH值随降水等级的增大呈“U”型变化,酸雨出现率在暴雨出现之前随着雨量的增大而增大,大雨时的酸雨出现率最大。闽南地区在偏西风下的酸雨出现率大,东北风下最小。

THE RELATIONSHIPS BETWEEN THE TBB'S LOW FREQUENCY SURGE OF THE SOUTH CHINA SEA AND THE TIBETAN PLATEAU AND THE SECONDARY MEIYU IN HUBEI PROVINCE

This paper analyzed the character of the TBB's low frequency surge in the South China Sea and the Tibetan Plateau in years with a secondary Meiyu(1980,1998) and the years(1991,1999) without it in Hubei province by the band-pass filter,EOF analysis and composition analysis with the grid wind data of GMS TBB and ECMWF.The results show that the topology of low frequency TBB surge in the South China Sea from June to July is the opposite between the years with the secondary Meiyu and the years without.In the years with the secondary Meiyu,the low frequency TBB surge in the South China Sea is high and the low frequency TBB surge of the Tibetan Plateau is low from the last ten days of July to the first ten days of August.The case is reversed in the years without the secondary Meiyu.The dimensional distribution of the low frequency TBB EOF1 in south Asia is that the southward is negative and the northward is positive in years with the secondary Meiyu,and the distribution is adverse in the years without the secondary Meiyu.