教師著作

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Subject: search.filters.subject.Taiwan Strait

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    北台灣海峽數值模擬研究
    (2007-11-30) 張育綾; 吳朝榮; 李忠潘
    本研究利用一個高解析度的台灣海峽數值模式，根據其海溫、海水流速流向、風向風速等，分析台灣海峽的海水流況，並利用數值模式時間及空間連續的特點，了解台灣海峽流況之年際與季節變化，並根據年際及季節變化中呈現的的特殊暖水現象做進一步的分析及研究。台灣西北海域在春季出現的暖水區域具有年際變化，而暖水的成因為東來的黑潮水與台灣海峽水輻合所致，1999 與2000 年春季為反聖嬰年，輻合較強，故有局部暖水出現，而2001、2002、2003年春季為正常年，輻合較弱，故沒有局部暖水出現。另外分析模式資料也發現台灣東北海域之冷渦現象亦具有年際變化，並且在北台灣海峽與暖水區域形成有趣的一暖一冷現象。
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    Volume transport through the Taiwan Strait : a numerical study.
    (the Chinese Geoscience Union, 2005-06-01) Wu, C.-R.; Y.-C. Hsin
    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 m s 6 3 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.