The Kuroshio Fronts and Cold Eddies off Northeastern Taiwan Observed by NOAA-AVHRR Imageries

以NOAA衛星AVHRR影像觀測臺灣東北海域黑潮鋒面及冷水圑之研究

林志遠(Chi-Yuan Lin) ； 徐崇仁(Chung-Zen Shyu) ； 施文鴻(Wen-Hung Shih)

《Terrestrial, Atmospheric and Oceanic Sciences》 3卷3期 (1992/09) Pp. 225-242

摘要

自1989年10月至1989年12月間，共選　用百餘張AVHHR-HRPT衛星水溫影像，用以觀測和分析台灣東北海域之表層水文動態（以北緯26度，東經123度爲中心，東西約350公里，南北約280公里），以下爲結果摘要：
在本觀測海域（KEEP海域），黑潮鋒面型態可歸納爲三型：(A)黑潮　鋒面自台灣東北一帶沿岸向東北方向延伸。(B)黑潮鋒面自台灣東北一帶沿岸往東北方向前進，而後形成一反時鍾方向之曲折過流。(C)黑潮鋒面順著北台灣沿岸往外海先向西繞了一個圓弧形後再轉向東方。另外，台灣東北外海的冷水團也是一主要之水文現象。在本海域的冷水團亦依其相對於黑潮鋒面之關係而劃分爲三種型式：(A)冷水團形成於無明顯鋒面時。(B)冷水團形成於黑潮鋒面之冷水側（西側）。(C)冷水團形成於黑潮鋒面之暖水側（東側）。
黑潮鋒面A型主要盛行於夏季時，至於其他三個季節，三種鋒面均有可能發生且有所變動，而其侵入陸棚之程度亦有所不同。至於冷水團，最常出現的是B型，於各季節均有可能發生；其次是A型，較盛行於夏季；最少出現的是C型，較常出現於冬季。對黑潮鋒面和冷水團之關系，最常出現的情形是冷水團B型伴隨著黑潮鋒面A型。

並列摘要

Over a hundred AVHRR-HRPT thermal imageries of NOAA satellites which covered dimensions 350Km (columns) x 280Km (rows) with center point at 26°N and 123°E, period from October 1989 to December 1990, had been derived to observe the surface features of waters off northeasern Taiwan.
The patterns of Kuroshio fronts in this water (KEEP area) can be generalized to three types: (A) front extending away from northeastern Taiwan northeastwardly, (B) front extending away from northeastern Taiwan north- eastwardly, then turning into an anticlockwise frontal eddy, and (C) front extending westward along coast of northern Taiwan then away with an arcuate curve and turning to east. The locations of cold eddies, another major phenomenon in this area, can also be generalized to three types related to Kuroshio fronts: (A) eddy formed with no Kuroshio fronts around, (B) eddy located on cool (west) side of fronts, and (C) eddy located on warm (east) side of fronts.
Front Type-A is the dominant and most stable pattern in summer. On the contrary, in other seasons, all three front types are variable and have different degrees of intrusion onto shelf waters. Regarding the cold eddies, the most common is Type-B, probably existing in each season. The next most common is Type-A, which prevails in summer. The least common is Type-C, which usually appears in winter. Regarding the relationship between front types and eddy types, the most prevailing composition is the cold eddy Type-B associated with the front Type-A.