黑潮上游海區海洋動力學實驗─子計畫三：台灣東南海域黑潮與其鄰近水體之互動(Ⅲ)
Date Issued
2002
Date
2002
Author(s)
王冑
DOI
902611M002017OP2
Abstract
During past years, we have deployed current-meters and water level recorders at several prescribed strategic locations, such as Heng-Chuen Ridge, east of Heng-Chuen, and Gordi Rock. In addition to these works, extensive CTD surveys had been conducted in the region too. These data show that the principal direction of flows at the lower layer offshore the eastern Heng-Chuen peninsula is mainly southward, same behavior was found for flows at the upper layer under prevailing northeastly winds. Aside from this, measurements from ADCP moorings, between Lan-Yu and Ping-Tung, show sub-inertial flows deflecting counter clockwisely with the increment of depth, this characteristic implies the lower currents possessing an on-shore component which should induce upwelling motions in the adjacent of continental margin. All of these suggest flow-topographic interactions are principal mechanisms to the flow pattern. The basin between Taiwan, Lan-Yu and Lu-Tao, blocking the lower northward flows, forms a flow-separation region to the inflow waters, which deflects to the east when approach to the basin. Upper layer flows could pass the basin and the cyclonically horizontal current shear associated with the current favors the emergence of a cyclonic circulation pattern along the southeast coast of Taiwan. The mechanism can interpret the occurrence of a steady counter current offshore Taitung coast, readily.
Subjects
current-meters
flow-topographic interactions
counter current
cyclonic circulation
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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