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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?
The CTD data and ADCP data of the recent marine survey of the PR21 section of the Luzon Strait were analyzed and calculated, which proves once again that zonal flow exists in the Luzon Strait all the year round. But for the weather scale, the flow pattern is changeable. Based on the high-resolution ocean circulation numerical model 4a (1992-1996) sea level (SSH) output, the monthly mean of zonal flow in the Luzon Strait was estimated using the geostationary relationship. The results show that the depth of the zonal flow in the South China Sea through the Strait is about 500m, and the flow velocity is more than 200m with an average velocity of 50cm / s and the maximum of 80cm / s. Less than 500m zonal turbulent flow rate is small, usually less than 10cm / S. Inflow from the ocean into the Strait is located in the central and southern Strait, the monthly average inflow maximum appears in November, 50cm / s. The monthly average outflow in the northern and southern upper straits of the Strait also showed a maximum flow rate of 50 cm / s in November, which is the northernmost (15 ° N) of the bifurcation of the northern equatorial stream in autumn and the highest in spring South (14 ° N). The monthly mean values of the inflows and outflows from the upper strata are about 10 × 10 ~ 6m ~ 3 / s and 5 × 10 ~ 6m ~ 3 / s, respectively. When the northeast monsoon prevails (from October to February next year), the flow into the Strait is much larger than the outflow from the Strait, and the difference between the two can reach 8 × 10 ~ 6m ~ 3 / s, while in the other seasons, the difference between the two Only 3 × 10 ~ 6m ~ 3 / s. This shows that when the northeast monsoon prevails, will there be more water from the South China Sea?