黄河中游降水与太平洋海温、南方涛动的关联

CONNECTION BETWEEN FRECIPITATION IN THE MIDDLE REACHES OF HUANGHE RIVER AND SEA TEMPERATURE AND SOUTHERN OSCILLATION

本文采用经验正交函数(EOF)展开和波谱分析方法,讨论1957年1月至1977年12月黄河中游降水分布特征及其演变周期,并讨论了它们分别与亦道西、东太平洋、北太平洋海域海温及南方涛动指数关系。计算结果表明,黄河中游降水的年际变化异常型主要为榆社一带以及西峰镇以南以西地区降水偏多(偏少),其余四周降水偏少(偏多)。这种异常型具有20.7个月(准两年)及12.4个月(准一年)显著周期。该月降水同上述有关洋面上月海温及南方涛动指数有较强的关联,在20.7个月周期上它们关联尤为明显。

In this paper we diseased the distribution features of precipitation during its period of evointion in the middle reaches of Huanghe river from January 1987 to December 1977 and their relationships with the tenperatu.ee in the western, eastern and northern Pacific and southern oscillation index, respectively by means of extended empirical orthodox function and spectrum analysis. The calculating results indieate that there are aanual variations of more (less) precipitation in the belt of Yushe and the south and west of Xifeng town and of less (more) precipitation in surrounding areas, the period lasting 20.7 and 12.4 months (quasi-one year). The monthly precipitation in this area is closely associated wi.th the monthly sea temperature and southern oscillation index in the abovu-mentioned sea surface, with their relationship strikingly distinct in the period of 20.7 montgs