摘要
通过绕岛环流理论和SODA(Simple Ocean Data Assimilation)数据对印尼贯穿流(ITF)和南海贯穿流(即吕宋海峡水交换,LST)在1976年气候突变前后的特征进行分析。结果表明,1976年后吕宋海峡水交换体积输送(LSTT)异常增大,而印尼贯穿流体积输送(ITFT)异常减少。吕宋海峡东部东风分量和南海内部的北风分量的局地驱动是导致LSTT在1976年后增加的主要因素,南海内部异常北风分量对LSTT增加的贡献能够达到53%;而赤道太平洋的西风分量则是导致ITFT在1976年后减少的主要因素,其贡献大约为61%。1976年后15°N左右的NEC(North Equatorial Current)体积输送异常增强,但总NEC体积输送异常减弱。KC(Kuroshio Current)体积输送异常增强,而MC(Mindanao Current)、NECC(North Equatorial Countercurrent)、SEC(South EquatorialCurrent)体积输送异常减弱。赤道西太平洋由风场变化通过Sverdrup动力过程产生的异常气旋性环流阻碍了太平洋水体向印度洋的输入。
The variability of the Indonesian throughflow (ITF) and the South China Sea throughflow (that is indicated by the Luzon Strait transport, hereafter is LST) is analyzed by the "Island Rule" theory and the Simple Ocean Data Assimilation (SODA) data set. The results show that the volume transport of the LST (herein, LSTT) increased and that of the ITF (herein, ITFT) decreased after 1976. The main factors for the increase of the LSTT after 1976 include the easterly wind component in the east of the Luzon Strait and the local forcing of the northerly wind component in the interior SCS, and the contribution of the northerly wind anomaly component in the interior SCS can reach to 53 % ; while the westerly wind compo- nent in the equatorial Pacific is the main factor for the decrease of the ITF, with a contribution of 61%. The volume transport of the North Equatorial Current (NEC) near 15°N increased abnormally but the total NEC decreased abnormally after 1976. The volume transport of the Kuroshio Current (KC) increased abnormally, whereas those of the Mindanao Current (MC), the North Equatorial Countercurrent (NECC) and the South Equatorial Current (SEC) decreased abnormally. The cyclonic circulation anomaly in the western equatorial Pacific induced by the wind stress through the Sverdrup dynamic process obstructed the water flow from the Pacific Ocean to the Indian Ocean.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2007年第6期1-6,共6页
Journal of Tropical Oceanography
基金
中国科学院南海海洋研究所博士科研启动基金(50601-76)
中国科学院知识创新工程项目(KZCX2-YW-214)
国家自然科学基金项目(40520140074)
关键词
印尼贯穿流
吕宋海峡水交换
体积输送
局地驱动
赤道太平洋
风场变化
Indonesian throughflow (ITF)
Luzon Strait ing
equatorial Pacific
variation of wind stress transport (LST)
volume transport
local forc