眼牆置換循環

眼牆置換循環（英語：Eyewall replacement cycle），又稱為眼壁更替週期，是一種發生於高強度之熱帶氣旋中心的現象，一個外眼壁形成，並逐步移入中心，取代舊有的內眼壁。眼牆置換會自然發生於強烈的熱帶氣旋，一般發生在接近中心最高持續風速大於185公里每小時（115英里每小時））的熱帶氣旋，亦即發展非常成熟之颱風或颶風，相當於中國國家氣象中心和香港天文台之超強颱風、臺灣中央氣象局之強烈颱風、薩菲爾-辛普森颶風等級之三級颶風（大型颶風）或以上級別。

熱帶氣旋在出現「眼牆置換循環」前，首先會發展出「雙眼牆」結構（或稱「雙重眼壁」、「同心眼牆」）。一個外眼壁在中心密集雲團形成，並緩慢收縮，逐漸奪走舊有內眼壁繼續保持所需要的水分和角動量。因為熱帶氣旋的眼牆風力最大，所以在眼牆置換的過程中熱帶氣旋通常會減弱。內眼壁逐漸被外眼壁「扼殺」，最終內眼壁將會消失，外眼壁則繼續收緊。^[1]

參考資料

^ 香港天文台. 颱風杜鵑——雙重眼壁的颱風. 14-4-2014. 请检查|date=中的日期值 (帮助)

外部連結

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[1] 香港天文台. 颱風杜鵑——雙重眼壁的颱風. 14-4-2014. 请检查|date=中的日期值 (帮助)

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