Intrseasonal Variation in the Velocity Field of the Northern South China Sea
Date Issued
2004
Date
2004
Author(s)
唐存勇
DOI
922611M002008
Abstract
Two subsurface Acoustic Doppler Current Profilers (ADCP) were deployed at the
northeastern South China Sea to study circulation structure in the area as well as the path
and process of Kuroshio intrusion. The 48-hour low-pass filtered data reveal significant
intra-seasonal variations in the velocity field. The current pattern alternates between
clockwise and counterclockwise even within a single month. Local wind forcing
dominated by monsoon winds fails to address the phenomena and variations. The present
study suggests that wind stress curl forcing is the dominant process controlling the
circulation picture in the area. While a stronger wind stress curl appeared and developed
off southern tip of Taiwan, it will provide negative vorticity to the intruded current and
form an anticyclonic eddy. The stronger current is always going along with the stronger
wind stress curl. On the other hand, while the curl in the area looses or decays, the
intruded current becomes weakened and forms a cyclonic eddy. The agreement between
wind stress curl and the velocity field suggests that changes in the wind stress curl
contribute to the intra-seasonal variations in the northeastern South China Sea.
Publisher
臺北市：國立臺灣大學海洋研究所
Description
在計畫書中承諾以海洋數值模式配合實測海流資料，探討由呂宋海峽入侵的黑潮、南海環流、風等參數之間的交互作，對北南海流場之季節內變動的影響
Type
report
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