Volume Transport through the Taiwan Strait: A Numerical Study
Volume Transport through the Taiwan Strait: A Numerical Study
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DOI：
10.3319/tao.2005.16.2.377(oc
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发表时间：
2005-06
影响因子：
0.8
通讯作者：
Chau‐Ron Wu;Y. Hsin
中科院分区：
文献类型：
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作者：
Chau‐Ron Wu;Y. Hsin
构建了具有真实测深的精细网格分辨率模型，以研究观测有限的台湾海峡的水流时空结构。该模型覆盖范围扩大，包括整个东海和南海以及黑潮所占据的地区。精细分辨率模型从更大规模的西太平洋模型中得出开放边界条件。来自欧洲中期天气预报中心和国家环境预测中心的两种数值天气产品以及一套基于卫星观测的风装置（QSCAT）用于强制海洋模型。模型实验表明，当模型由 QSCAT 风力驱动时，可以实现最佳模拟。模型模拟中再现了几个重要特征。运输量向北，最大发生在夏季，而运输量最小的是向南，发生在秋季和冬季。运输量的总体趋势与季风的季节性反转有关。目前的模型还表明，在强东北风期间，整个台湾海峡的气流是向西南方向流动。基于当前模型的年平均传输量为 1.09 Sv (1 Sv=10^6 m^3S^(-1))，小于基于船载声学多普勒电流剖面仪 (sb-ADCP) 观测的大多数公布值。结果表明，sb-ADCP 观测结果偏向于夏季和晴朗天气的估计，因为冬季东北季风期间的恶劣天气通常会妨碍海上观测。
A fine grid resolution model with realistic bathymetry was constructed to study the spatial and temporal structures of flow through the Taiwan Strait where observations are limited. The model covers an expanded domain that includes the entire East China Sea and South China Sea, as well as the region occupied by the Kuroshio. The fine-resolution model derives its open boundary conditions from a larger scale Western Pacific Ocean model. Two numerical weather products from the European Center for Medium-Range Weather Forecasts and National Centers for Environmental Prediction, and one satellite observation-based wind set (QSCAT) are used to force the ocean model. Model experiments suggested that the best simulation is achieved when the model is driven by the QSCAT wind forcing. Several important features are reproduced in the model simulation. The volume transport is northward and largest in summer while minimal volume transport is southward and occurs in fall and winter. The general trend of volume transport is related to the seasonal reversal of monsoon winds. The present model also suggests that flow in the entire Taiwan Strait is to the southwest during periods of strong northeasterly wind. The annual average transport based on the present model is 1.09 Sv (1 Sv=10^6 m^3S^(-1)), which is smaller than most published values based on shipboard Acoustic Doppler Current Profiler (sb-ADCP) observations. The result suggests that sb-ADCP observations are biased toward estimates in summer and fair weather since bad weather during the winter northeast monsoon often prevents seagoing observations.