印尼贯穿流的诊断计算  

Diagnostic calculation of Indonesian Throughflow

作　　者：杨阳[1] 周伟东[1] 董丹鹏[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广东广州510301

出　　处：《热带海洋学报》2007年第2期1-8,共8页Journal of Tropical Oceanography

基　　金：国家基金委科学部主任基金项目(40346029);国家自然科学基金项目(40346029);国家908项目(908-02-01-03)

摘　　要：利用全球大洋二维的自由表面诊断模型并采用气候态Levitus(2001)温盐资料及COADS风应力资料估算印尼贯穿流及其季节变化。结果表明,南海的Karimata海峡出流量对印尼贯穿流有显著的贡献,印尼贯穿流的平均流量为16.6Sv,流量在6月最大(18.5Sv),4月最小(12.7Sv)。与其它模式结果和观测结果一致的是,Makas-sar海峡流量在7月最大(13.8Sv),1月最小(0.2Sv),其年平均流量为6.7Sv;Karimata海峡是南海南部最大的出水口,年平均流量为2.6Sv,爪哇海水在5—9月之间流入南海,其它月份南海南部水流入爪哇海;Timor海峡是印尼贯穿流最大的出口;Lombok流量的季节变化表现为半年周期。通过模拟计算结果,结合动力计算,获取了Makassar海峡经向速度的垂向结构,结果显示Makassar海峡的经向速度有明显的垂向切变,100m层次的南向速度为30—35cm.s-1。A 2-dimensional global diagnostic model is used to investigate the Indonesian Throughflow and its seasonal varieties. The model is driven by climatological data of temperature and salinity fields from Levitus （2001） and surface wind stress data from COADS, respectively. The computations show that the annual mean Indonesian Throughflow transport amounts to 16.6Sv, with a maximum （minimum） transport of 18.5Sv （12.7Sv） in June （April）. Accordant with the results of others models and observations, the Makassar Strait transport is maximum in July （13.8Sv） and minimum in January （0.2Sv）, and its annual mean transport is 6.7Sv. The Karimata Strait is the largest channel of the southern South China Sea （SCS）, with an annual mean transport of 2.6Sv. Seawater flows from the Java Sea into the SCS from May to September, and flow out of the southern SCS into the Java Sea in the rest time of the year. The Timor Strait is the largest outlet of the Indonesian Throughflow; the seasonal change of the Lombok Strait transport is characteristic of semiannual cycle. The vertical structure of the longitudinal velocity of the flow in the Makassar Strait is obtained by the model in combination with dynamic calculation. The results show an obvious vertical shear of the flow in the Makassar Strait, and the mean southward flow at 100m depth has a velocity of 30-35cm·s^-1.

关 键 词：诊断模型 印尼贯穿流 季节变化 

分 类 号：P731[天文地球—海洋科学]