秋、冬季赤道西太平洋海面气象特征初析

ANALYSIS ON METEOROLOGICAL CHARACTERISTICS OF THE EQUATORIAL WESTERN PACIFIC OCEAN DURING AUTUMN-WINTER

本文分析1985,1986,1987三年的部分时间的赤道西太平洋考察资料,结果表明,厄尔尼诺影响下气象特征变化明显;气象特征较邻近热带和赤道海域典型;温度的水平分布呈东高西低,北高南低;气象要素平均日变化和随季节变化特征显著。

In this paper the sea surface meteorological characteristics were analysed using the meteorological data obtained by R. V. 'Shi Yan 3' of the Academia sinica twenty four times a day from Dec. 26, 1985 to Jan. 20, 1986; Oct. 31, to Dec.9, 1986 and Oct. 1 to Nov. 10, 1987, in 5°S-7°N, 125-150°E sea area.The characteristics of each element's mean daily variation and seasonal variation were distinct. Under the influence of the crossed equatorial current from south hemisphere, the sea surface wind force in the eastern area was differ ent from that in the western. The sea and air temperatures rise with the longitude, maintaining higher temperature in the eastern and the northern.Under the influence of E1 Nino event the sea surface temperature of the area rises obviously in the east area in horizontal distribution. The cold water area located in 5°N, 135°E shrank obviously. The variation of intensity of subtropical high, the generation of the tropical cyclone and other meteorological characteristics last year were different from this El Nino year.This area compared with the vicinity of tropical and equatorial sea, has higher temperature and humidity, and a lot more cloud. The time inferval influenced by southern air flow was short and the wind speed is small. The maximum sea surface and air temperature in the mean daily variation occurred simultaneously in advance with seasonal variation.