颱風結論

1. 在 Forced stage，屬於強烈颱風的瑪莉亞颱風，距離馬祖浮標最近僅 5 公里遠，

對於海流的影響較深，且整層海水的變化較一致，水下3.5 公尺處流速從約 45cm/s 增強至157cm/s，海流流向隨著風向迅速改變，在颱風最靠近時為北風，海流往風 向的右手邊流，朝西南的方向。相較於中度颱風米塔，距離馬祖浮標較遠，對於 海流的影響沒那麼深，以及變化的速度沒那麼迅速跟一致。

2. Relaxation stage 颱風遠離後會誘發近慣性震盪增強，從相似路徑中比較因不同颱 風因素，如颱風強度、暴風半徑、移動速度等，而造成不同或相似的近慣性海流 反應，近慣性震盪持續的天數，或是增強的程度。

2.1 馬勒卡及米塔颱風的暴風半徑、颱風強度、與龍洞浮標的距離等條件皆相 似，但馬勒卡颱風誘發的近慣性海流較強，其移動速度較慢低於4m/s，故近慣 性海流的強弱可能受移動速度的快慢影響。

2.2 暴風半徑較大且距離七美浮標較近的梅姬颱風，與相對暴風半徑小與距離 七美浮標遠的杜鵑颱風比，梅姬颱風誘發的近慣性海流持續時間較久，故暴風 半徑大小及距離遠近，也是可能影響近慣性海流持續時間的因素。

2.3 位於颱風路徑左右兩側的近慣性強度會有所不同，馬勒卡颱風、米塔颱風，

以及尼莎颱風，三颱風的強度、暴風半徑、與浮標距離皆相似，但位於尼莎颱

90

風右手邊的龍洞浮標觀測到的海流，颱風經過後所誘發的近慣性海流較強，在 馬勒卡與米塔路徑左手邊觀測到的近慣性海流相對較弱，因為在颱風路徑的右 手邊，受颱風通過驅動順時針旋轉的風場並產生強烈的近慣性運動，從颱風路 徑的左手邊通過產生逆時針的風場，不會促使近慣性海流的增強。

表 6-1 位於龍洞浮標之左側颱風與右側颱風比較表

颱風名稱 位置 強度 暴風半徑 移動速度 近慣性海流

馬勒卡

龍洞浮標右側

77 公里 中度 180/60 1.8m/s 中

米塔

龍洞浮標右側 78 公里

中度 180/60 5.5m/s 較弱

尼莎

龍洞浮標左側 62 公里

中度 180/60 4.6m/s 較強

91

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