中文摘要：

本文利用NCEP/NCAR 1951-2004年盛夏（7-8月）平均风场资料,研究了与同期我国160个测站的温度和降水的关系。将东亚500 hPa风场,温度场,降水量场进行经验正交分解,得到它们的主要模态的时空变化特征。结果表明东亚风场EOF的主要模态与我国温度,降水量的EOF的主要模态对应,其第一EOF模态与盛夏温度,降水量的关系密切。研究还得到我国盛夏低温,雨涝的500 hPa大尺度风场的特征。最后指出,500 hPa风场异常对我国盛夏温度,降水量异常分布的解释方差明显比500 hPa位势高度场大。

英文摘要：

Based on the NCEP/NCAR 1951-2004 midsummer（July--August）data, the relation to the wind field and the contemporaneous temperature and rainfall fields at 160 China stations is studied by analysing the EOF main models of these factor fields. This paper indicates that the first EOF main model of wind field over East Asia has close relation to the China temperature and rainfall fields in the midsummer at the same term, and the main models of the three factor fields are closely related. The abnormal character of large scale wind field at 500 hPa has been explored when the low temperature and flood happened in midsummer. The results indicate that the variance of the precipitation and temperature explained by wind filed at 500 hPa is obviously greater than that by geopotential height filed at 500 hPa.