由1958—1977年北印度洋季风区海温资料和华北7个站平均月降水量资料的功率谱、凝聚谱、位相谱分析,并对资料的距平值作7个月周期的带通滤波后发现,1月份(或8月份)北印度洋季风区海温与中国北方(指华北地区)降水有较高的凝聚值和较好的反位相相关,为准半年的振荡关系。 From the SST data of the North Indian Ocean monsoon region from 1958 to 1977 and the average lunar precipitation data of 7 stations in North China, the power spectrum, condensed spectrum and phase spectrum were analyzed, and the data of the anomalies were band-pass filtered after 7 months It is found that in January (or August), the SST over the North Indian Ocean monsoon region is related to the higher condensation value and the better antiphase precipitation in north China (referring to the North China region), which is a quasi-six-year oscillation.