10-12月低纬度东南亚和西太平洋上空流场特征

LOW LATITUDE FLOW PATTERNS OVER SOUTH-EAST ASIA AND WESTERN PACIFIC IN THE MONTHS FROM OCTOBER TO DECEMBER

摘要: 根据1958-1959年资料,初冬西太平洋低纬度流场可分为两种流型,即浅薄副热带高压型与深厚副热带高压型。前者在高纬度为低西风指数型,副热带急流的配置与平均情况一致在近赤道地区对流层下层有不剧烈发展的东风波。后者在高纬为高西风指数型,副热带急流的配置与平均情况反位相,近赤道地区对流层下层有赤道西风,在赤道辐合带上井有台风发生,两者间有一个月上下的准周期变化。

Abstract: The low latitude wind Eield over South-East Asia and Western Pacific in the months from October to December is studied. Two types of flow patterns with different structure are presented. Their relations with high latitude flow patterns and low latitude disturbances are discussed. It seems that there is a quisiperiodic oscillation with period about one month.