摘要
本文主要根据CSK水文资料及图册,比较详细地探讨了台湾和菲律宾以东海域1965～1968年冬季的海流结构及其变异。指出副热带流涡的西端部分在1965～1966及1967年冬季其基本结构只含二脊一槽,而与吉田及城所(1967)的模式更为相似。本文还引用信风场应力资料,得出了本海域主要平均纬向海流的带状结构与海面上风应力的作用相一致的结果。这是海—气相互作用的一个好例。
In this paper, based on CSK hydrographic data and atlas (JODC, 1967 - 1977) the current structure and its variations in the area east of Taiwan and Philippines in winters of 1965-1969 are systematically analyzed in some detail.In the area west of 140°E and north of 15°N the Western Subtropical Gyre (WSG) in indeed not a single one as traditionally described, it splits into two or more subgyres. But its structure is not totally alike as that shown by Hasunuma and Yoshida (1978). The Subtropical Gyre shown by them reveals three major ridges and two troughs, and the three ridges come in contact at their western end. But the basic structure of WSG in winters of 1965-1966 and 1967 reveals only two major ridges and one trough, and tht two ridges are not joined together near the western boundary. Therefore, though WSG splits into subgyres, its synoptic 'fine' structure is not fixed or regular, but changes seasonally and yearly. The winter of 1965-1966 is the period during which the model of two ridges and one trough well developed.The Subtropical Countercurrent (STCC) is evidently displayed at lower subtropical latitudes in winter. Its path is more continuous in winters (1965-1966, 1967) than in summer (1965). It is evident from the pattern of stream-lines that STTC seems to be a branch separated from eastern boundary of the Kuroshio east of Taiwan.In the area east of Mindanao Island and west of Palau Islands, a cyclonic eddy existed among the North Equatorial Current (NEC), Mindanao Current and North Equatorial Counter-current (NECC) throughout the period. The variation of the Mindanao Cyclonic Eddy is closely related with the El Nino event, which has been discussed in a separate paper.The major zonal geostrophic currents of this area are well defined in their boundaries and display a pronounced banded structure of quasi-stationary nature. The relation of the current banded structure with the overlying wind fields is analyzed by using the trade wind stress data (Wyrtki and Meyers, 1975). Results show that, qualitatively speaking, banded structure of the major mean zonal currents along 137°E from Equator to 28°N (including NECC, NEC and STCC) is closely related to the meridional distribution of the zonally averaged wind stress curl. This is a good example of air-sea connection.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1989年第5期393-400,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金
