摘要
亞洲海域國際聲學研究計劃(Asian Seas International Acoustic Experiment, ASIAEX)於南海北部棚裂區(Shelf Break)，橫跨不同的等深線施放多組錨碇量測海溫、海流及壓力的變化，並以拖曳式溫鹽壓儀(Seasoar)及船碇式都普勒流剖儀(SB-ADCP)進行較大範圍量測。實驗時間約30天，實驗區間則約0.8°×0.8°。
利用其中7組錨碇探討該實驗區間之短期海洋現象的時空分佈情形。資料顯示該區間的高頻流場主要以內孤立子(Internal Solitons)與全、半日潮為主。其中Solitons的週期約15分鐘，向西北方傳遞的估算速度在較深水處為33.0 4.3 cm/sec與理論推算的線性內波傳遞速度近似，而錨碇的溫度顯示Internal Solitons大都以下壓(Depression Wave)型態出現，上舉型(Elevation Wave)的Solitons亦可見，唯在此區間其振幅小且多不易判斷。半日潮主要以M2的正壓潮(Barotropic Tide)為主，全日潮則以斜壓潮(Baroclinic Tide)為主。低頻流場(Subtidal Current)大都以沿等深線流的弱西北流為主。表層溫度因漸近北半球夏季呈增溫趨勢，次表層的低頻海溫(Subtidal Temperature)變化呈降溫趨勢，在此同時當地的風應力旋度(Wind Stress Curl)增加，下降流(Downwelling)減弱或上升流(Upwelling)增加，可能是此降溫的原因之一。通過北南海的西馬隆颱風(Cimaron)，於實驗末期引起陸棚上西流增強，上層及淺水海域溫度上升。SB-ADCP及Seasoar之Subtidal的溫流場，顯示該區間為一順時針流場且流速弱，表層海溫的等值線分佈以東南方較暖，較下層則西冷東暖，近底部海溫的水平梯度小。上層及淺水海域的海溫於颱風期間上升的現象，應是較暖的海水水平移動所致。

致謝 1
目錄 2
表目錄 3
圖目錄 4
摘要 7
第一章、緒論 9
第二章、現場工作及資料 11
第三章、內孤立子與潮流 20
第四章、流場與溫度低頻變化 30
第五章、討論與結論 38
參考文獻 40
表列
圖列

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