摘要
利用长时间序列的石垣和基隆两个验潮站的海平面高度记录 ( 1 8年 )计算了台湾以东的黑潮流量 ,并结合风应力资料 (SODA) ,探讨了台湾以东黑潮流量的年际变化及其和风应力旋度的关系。台湾以东黑潮流量的峰值出现在 1 980— 1 981、1 982— 1 983、1 986、1 988及 1 991年 ,低值出现在 1 984、1 990、1 993— 1 995年。小波分析结果显示 ,台湾以东黑潮流量具有 2— 5年的显著周期 (峰值在 2年和 5年 ) ;台湾以东北太平洋区域风应力旋度具有 2— 7年的显著周期 (峰值在 3年和 6年 )。在 1 980— 1 991年间 ,黑潮大弯曲频繁发生 ,台湾以东黑潮流量偏大 ,与台湾以东太平洋区域风应力旋度间的关系较好 ;而在 1 991— 1 995年间 ,没有黑潮大弯曲发生 ,台湾以东黑潮流量偏低 ,与台湾以东太平洋区域风应力旋度间的关系较差。
Based on the regression relationship along the WOCE PCM-1 section between the sea level records and the Kuroshio transport, sea level records are employed to calculate Kuroshio transport between 1980 and 1997 at 1 day′s interval which comes from Keelung and Ishigaki in World Ocean Circulation Experiment (WOCE) dataset. The wind stress data involved in this study is available from Simple Ocean Data Assimilation (SODA)which is 1°×1°(resolution from October 1992 to August 2001 at 1 month′s interval. The Kuroshio transport calculated from sea level records data accordant well with that from the PCM-1 mooring data that the correlation coefficient between the two amounts to as high as 0.72, far above the 95% significant level.The 13-month running averaging of the Kuroshio transport is subtracted to reduce the seasonal and intraseasonal variation of the Kuroshio transport. From the Kuroshio transport anomaly time serial (also called SLDKV in this paper),maximum of the Kuroshio transport occurred at 1980—1983,1986,1988 and 1991 (positive ano maly, exceeds 0.5Sv), while minimum of the Kuroshio transport occurred at 1984,1990,1993—1995(positive anomaly exceeds -0.5 Sv), which indicates a trend of reduction of the Kuroshio transnort east of Taiwan after 1991. The results of wavelet analysis suggest the 2—5 years significant variation in the Kuroshio transport to the east of Taiwan with the peaks at 2 and 5 years. The 2—3 years fluctuation is stronger during 1980 and 1990 and the 5 years fluctuation stronger in the following 8 years. From the Sverdrup relationship, the interannual variation of Kuroshio east of Taiwan relates to that in the wind stress curl field above the interior gyre. Based on the wind stress data in SODA dataset, the barotropie Sverdrup transport along 24.5°N in the interior gyre of the North Pacific is calculated.The seasonal and intraseasonal variation of the Sverdrup transport (also called WDKV in this paper) is subtracted. The correlation coefficient be & ween the WDKV and SLDK
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2004年第6期507-512,共6页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金资助项目
4 0 3330 30号
中国海洋大学引进人才科研启动基金资助项目
2 0 0 3- 2 0 0 5
关键词
台湾以东黑潮流量
风应力旋度
年际变化
Kuroshio transport east of Taiwan, Wind stress curl, Interannual variation
