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用1951～1986年亚洲太平洋地区500hpa月平均高度、西北太平洋月平均海表温度及夏季500hpa副高脊线位置资料,分析海温对夏季副高脊线年际变异的影响。得出结论:(1)1～8月海温距平EOF1～3场对夏季副高脊线变异具有明显影响的共有9个。(2)夏季各月副高脊线年际变化都具有明显的主周期。而且它们是由同期海温距平EOF2场所引起。(3)夏季各月副高脊线变异可能是由同期海温距平EOF2场的东西向“热成风效应”过程所致。
Based on the monthly average height of 500hpa in Asia Pacific from 1951 to 1986, the monthly average sea surface temperature in the northwest Pacific Ocean and the location of the 500hpa ridgeline in summer, the effect of sea surface temperature on the interannual variation of summer subtropical ridgeline was analyzed. The conclusions are as follows: (1) A total of 9 EOF1 ~ 3 SSTs from January to August have significant effects on summer subtropical high ridge variation. (2) The interannual variations of the subtropical high ridges in each month all have obvious main periods. And they are caused by SOF EOF2 over the same period. (3) Variation of the subtropical high ridges in each month of summer may be caused by the process of “warm-wind effect” in the EOF2 field of the SST anomaly.