【摘要】 分析和计算了吕宋海峡ＰＲ２１断面最近海洋调查的部分ＣＴＤ资料和ＡＤＣＰ资料，再一次证明吕宋海峡常年存在纬向流．但对于天气尺度而言，该流型是多变的．根据高分辨率的海洋环流数值模式４ａ（１９９２～１９９６年）海平面高度（ＳＳＨ）的输出值，运用地转关系估计了吕宋海峡纬向流的月平均值．研究表明；通过海峡流入、流出南海纬向流的深度一般达到５００ｍ左右，２００ｍ以上流速较大，平均流速为 ５０ｃｍ／ｓ，最大时达８０ｃｍ／ｓ以上．５００ｍ以下的纬向地转流流速较小，通常小于１０ｃｍ／Ｓ．由大洋进入海峡的入流位置位于海峡的中部和南部，月平均入流最大值出现在１１月，为 ５０ｃｍ／ｓ．位于海峡的北部和南部上层海洋的月平均出流，最大流速亦出现在１１月，也为５０ｃｍ／ｓ，这与秋季北赤道流分叉位置最北（１５°Ｎ），春季分叉位置最南（１４°Ｎ）有关．上层流入、流出海峡的流量的月平均值分别约为１０×１０～６ｍ～３／ｓ和５× １０～６ｍ～３／ｓ．当东北季风盛行时（从１０月到翌年２月），流入海峡的流量远大于流出海峡的流量，两者的差可达８×１０～６ｍ～３／ｓ，而在其他季节两者的差仅为 ３×１０～６ｍ～３／ｓ．这说明东北季风盛行时，会有较多的水从南海南?更多还原

【Abstract】 Some new data of CTD and ADCP, observed along PR21 Sections in the Luzon Strait, are analyzed and calculated. It is proved again that there always are zonal currents in the Luzon Strait, but the zonal currents are great vareations in the synoptic time scale. The monthly averages of the zonal geostrophic current velocity and transport of upper layer ocean in the Luzon Strait are calculated based on sea surface height from 1992 to 1996, which is the output of the ocean circulation model with high resolution. Those results reveal that in the Luzon Strait, the zonal currents [inflow and outflow from the South China Sea (SCS)] clear appear above 500m; the greater current speed appears above 200m; the average of the current speed is 50cm/s, and the maximum current speed is above 80cm/s, below 500m the current speed is less than 10cm/s. The monthly average inflow from the Pacific to the SCS locates at the middle and the south of the strait, and its maximum current speed is about 50cm/s and appears in the Nov. The monthly average outflow from the SCS to the Pacific locates at the north and south of the strait, and its maximum current speed is about 50cm/s and appears in the Nov. too. It is related with the bifurcation of the North Equatiorial Current, which locates at the most north (15°N) in autumn and the most south (14°N) in spring. The monthly average transport of the inflow and outflow are 10 ×10～6 m～3/s and 5×10～6m～3/s, respectively. When the predominant wind is the northeaster (from Oct. to Feb.), the inflow transport is larger than outflow, the difference between inflow and outflow is 8×10～6m～3/s; but it is only about 3×10～6 m～3/s in other seasons. It means that the more water outflows from other straits in south of the SCS.更多还原