東北季風期間黑潮入侵東海南部陸棚對臺灣東北部海岸水溫及水位之影響及其動力現象之探討

王心秀

doi:10.6342/NTU.2013.02900

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東北季風期間黑潮入侵東海南部陸棚對臺灣東北部海岸水溫及水位之影響及其動力現象之探討

Influences of the Wintertime Kuroshio Intrusion on the Temperature and Sea Level along the Northeastern Coast of Taiwan and the Investigation of Its Dynamics

王心秀 , Masters　　Advisor：詹森　　Co-advisor ：陳世楠

繁體中文 DOI： 10.6342/NTU.2013.02900

溫壓測站；黑潮入侵；相對渦度；東海陸棚； tide gauge station ； Kuroshio intrusion ； relative vorticity ； East China Sea shelf

Abstract │ Reference (30) │ Altmetrics

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This study utilizes the sea level and temperature data from four tide gauge stations in the northeastern coast of Taiwan (Pengjiayu, Caoli, Magang, and Nanfan-Ao) and satellite remote sensing data to analyze the wintertime Kuroshio intrusion onto the East China Sea shelf. The low-pass filtered temperature (cutoff frequency at 1/20 day-1) shows two temperature anomalies at Penjiayu during the northeasterly monsoon period. The temperature increase anomalies range between 0.5 and 2.5℃ with a period of about 3 to 10 weeks. The temperature anomalies are linked to the shelf intrusion of the Kuroshio, which could be related to two different processes. The first process occurs between October and December, which is attributed to the monsoon-driven, northwestward Ekman drift of the Kuroshio. This type of intrusion is classified as small scale with a relatively short cross shelf penetration and causes temperature rise only at Penjiayu. The low-pass filtered sea level variations were observed at several stations with Su-Ao sea level reacting prior to Penjiayu. The second process occurred during December and March is a larger scale intrusion, beginning at an area between Mien-Hua Canyon and North Mien-Hua Canyon before the warm water of the Kuroshio moves towards the northern coast of Taiwan. This Kuroshio intrusion should be caused by the density difference between the mixed layer of the Kuroshio south of I-Lan Ridge and that of the East China Sea, where shelf water becomes denser and then subsided after extended periods of atmospheric cooling. The thickening of the mixed layer south of I-Lan Ridge, on the other hand, enhances water column compression and stretching over the ridge and the deep Okinawa Trough, respectively, and thus causes cyclonic intrusion onto the shelf due to the relatively vorticity disturbance.

Reference ( 30 ) 〈TOP〉

Benoit Cushman-Roison (2006), Introduction to geophysical fluid dynamics, 2nd ed., Prentice-Hall, Inc., 185-186 pp.
連結：
Chao S.-Y. (1991), Circulation of the East China Sea, a numerical study, J. Oceanogr., 42, 273–295.
連結：
Chern C.-S., and J. Wang (1990), On the mixing of waters at a northern offshore area of Taiwan, Terrestrial Atmospheric and Oceanic Sciences, 1(3), 297–306.
連結：
Chern C.-S. and J. Wang (1992b), On the seasonal variation of the Kuroshio intrusion onto the East China Sea, Acta Oceanographica Taiwanica, 29, 1–17.
連結：
Chern C.-S. and J. Wang (1994), Influence of the seasonal thermocline on the Intrusion of Kuroshio across the continental shelf northeast of Taiwan, J. Oceanogr., 50, 691-711.
連結：

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