摘要
通过对COADS和OISST海洋气象资料的分析,以南海的海面温度异常(SSTA)为指示因子,在研究年际尺度上的南海与大尺度ENSO关系的基础上,进一步探讨了季风强迫下Ekman抽吸对 SSTA年际变化的贡献。研究发现,南海 SSTA滞后5个月时与 Nino 3的 SSTA相关系数最大,且其年际变化依方差贡献大小,分别有42.7月、25.6月及36.6个月的周期,这3个年际模态基本上能够描述海面温度的年际变异,为南海在大尺度ENSO背景下存在区域响应提供了重要的证据;应用Krause Turner混合层温度方程对南海异常暖事件的研究表明,除了经向风应力异常,Ekman抽吸也是影响SSTA年际变异的主要因素,在某些异常年份甚至是主导因素,为南海SSTA年际变化的研究提供了重要的补充。
Based on COADS & OISST data, the interannual variability of sea surface tempera-
ture anomaly (SSTA ) in the South China Sea (SCS) is studied combined with ENSO events,
and the contribution of Ekman pumping to the variability is further discussed. The results
show that the SSTA in the SCS correlates well with Nino 3 SSTA, with a lag time of 5
months. And three typical periods of 42. 7 months, 25. 6 months and 36. 6 months are recog-
nized according to the variance contribution. The three modes can approximately describe the
interannual variability of SSTA in the SCS, which proves that the regional response does exist
in the SCS in the large-scale ENSO background. Krause- Turner upper mixed layer dynamic e-
quation is applied to study the anomalous warm events in the SCS. Ekman pumping is proved
to be another important element influencing the interannual variability of SSTA in the SCS be-
sides the meridional wind stress known before, and even to be a dominatant element in some
years. This is a good supplement to the current study about the interannual variability of SS-
TA in the SCS.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2003年第4期42-50,共9页
Journal of Tropical Oceanography
基金
中国科学院百人计划项目(0300YQ000101)
中国科学院知识创新工程项目(KZCX2-202)
广东省自然科学基金(011271)
关键词
南海
SSTA
年际变化
EKMAN抽吸
South China Sea (SCS)
sea surface temperature anomaly (SSTA)
interannual variability
Ekman pumping
