引潮力对副高的影响及在入梅期中的作用

The Influence of Tide-generating Forces on Subtropical High and Its Role in the Beginning of the Meiyu Period

分析了长江中下游入梅期前后西太平洋副高的演变，发现，无论是入梅前副高形势的建立，还是入梅后副高的稳定发展，都与引潮力有密切关系，并归纳得到预示长江中下游入梅的天文判据。

The fluctuation of subtropical high of West Pacific during the beginning of the Meiyu period in the middle and lower reaches of Changjiang River have been analysed. It is found that the subtropical high is closely related to the tide-generating forces,either it's set up before the beginning of the Meiyu or it's stable continuation after it. The astronomical criterion is derived to be used for forecasting the beginning of the Meiyu.