黑潮是北太平洋的西方邊界流，屬於北赤道洋流碰到西邊界陸地後向北的分支，途中經過菲律賓東岸、呂宋海峽後，再沿著東台灣通道繼續往東北流。在流經呂宋海峽時，有時會發生入侵至南海的情形。透過分析AVISO衛星資料發現，黑潮在呂宋海峽的入侵現象，存在著季節變化，當冬季東北季風強盛時，黑潮較常被發現到會入侵至南海內部，而西南季風盛行的夏季期間，並未發現有入侵的情況。
　　本研究透過模式試驗，發現黑潮入侵南海的現象與臺灣西南邊的風應力旋度有關。冬季時，臺灣西南邊負的風應力旋度轉為強烈，黑潮會明顯偏向西側，進而入侵至南海。反之，夏季時，臺灣西南邊的風應力旋度微弱甚至消散，黑潮則會沿著呂宋海峽東側一路向北前進，並未入侵至南海。
　　進一步將臺灣西南邊（119.5。E~121。E、21。N~22。N）的風應力旋度，與黑潮入侵至南海所流經區域（120。E~122。E、21。N~20.5。N）之動能計算其相關性，得到的相關係數達0.67，呈現顯著正相關，再次證實，臺灣西南邊的風應力旋度與黑潮入侵南海存在著密不可分的關係。

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