• 沒有找到結果。

總結而論,我們發現除了冰期、間冰期有沉積狀態改變外,還有至少五種不同 特殊類型的沉積型態發生於南海東北坡,包括 YD event、B/A、D-O events、Henrichs events 與未知“事件” (最有可能是颱風),頻繁的出現在南海東北部。

在過去 4 萬年全球性大尺度的氣候變化,冰期/間冰期的轉變,是造成沉積速 率和沉積物種類改變的主要控制因素。這些氣候變化影響陸地降雨的規模、河川 懸浮顆粒輸出量與海平面的侵蝕基準面,進而影響海洋沉積物的類型。

海洋基礎生產力主要控制因素為河川輸出營養鹽的濃度,當陸源物質輸出量有 大幅度增加或減少時,鈣質浮游性生物與矽質浮游性生物會呈現相同的增加或減 少。

突發事件的出現改變南海的陸源輸出量,亦影響南海東北部泥沙的傳輸。而在 南海地區性的突發事件的成因最有可能是颱風造成,受颱風強度與移動路徑影 響,導致在不同時間不同測站觀察到濁流的沉積特徵。

所有因素都在南海東北部的沉積物堆積和輸送上產生一定的效果。冰期與間冰 期的轉變是引發沉積物的傳輸、侵蝕、搬運和堆積的主要因素,其它較小規模的 氣候變化,包括 YD、 B/A、 D-O 和 Henrichs events,也都在沉積物的搬運與堆 積上產生作用。尚未被文獻探討的地區性事件,最有可能是颱風,也產生沉積物 的搬運與堆積的類似效果。

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