冬季北太平洋SST与西太平洋副高的相关性

Correlation between SST of North Pacific and the Subtropical High over Western Pacific in Winter

采用英国Hadley中心1974-2006年逐月的北太平洋海表温度资料和NCEP/NCAR的北半球500hPa和1000hPa高度场资料,利用一元回归和相关分析等统计方法,研究各月北太平洋海温的变化特征、探讨冬季西北太平洋海温关键区,然后分析关键区海温与气象场的联系。结果表明,北太平洋海温变率较大的地方出现在我国东部的西北太平洋地区,年代际变化为上升趋势;海温与前一年12月和同期1月500hPa位势高度场的相关最好,表现为冬季东亚大槽对关键区海温的显著影响。1月关键区海温与后期5-6月西太平洋副高存在较显著的正相关,即1月关键区海温升高,同年5-6月副高亦加强,即反映冬季北太平洋SST对西太平洋副高的影响。

According to the monthly Northern Pacific sea surface temperature(SST) dataset of Hadley center for the period 1974 to 2006 and the monthly northern hemisphere 500hPa height field and 1000hPa height field dataset of NCEP/NCAR from 1974 to 2006,the variation characteristics of Pacific sea surface temperature and the correlation between the SST key region in January and atmospheric fields are studied by using the one-variable linear regression method and the correlation analysis method.The results are as follows: the location with the larger variation of the North Pacific SST lies in the Northwestern Pacific Ocean adjacent to the east of China,where the annual trend of every month is ascending during 1975 and 2006.Among the correlation between the key region sea temperature in January and atmospheric fields,preceding December and January,are more significant which shows that the atmosphere influences the key region sea temperature. The most remarkable correlation area lies in the key region and Northwestern Pacific ocean.The relations between the key region sea temperature and the West pacific Subtropical high are emphatically analyzed.The SST of key region in January is closely related with the lagged atmosphere in April,May and June which indicates that higher the key region SST is,the stronger the West Pacific Subtropic high.