天鴿(Hato)颱風於2017年8月22至23日通過南海時，其強度迅速發展達到快速增強(Rapid Intensification，RI)，於23日0600 UTC登陸澳門並造成當地有史以來最嚴重的災情。本研究利用WRF模式以歐洲中期天氣預報中心(European Centre for Medium-Range Weather Forecast ; ECMWF)之ERA5全球模式為初始場，動力降尺度輸出空間解析度為3 km預報場，分析颱風內部結構與發展過程，藉以探討其RI之成因。
結果顯示，於RI初期，慣性穩定較低觸發徑向加速，在颱風中心強迫上升運動，加上環境垂直風切減弱，建立有利環境，使對流爆發(Convective Bursts，CBs)形成。於RI發展期，加速對流爆發(w>2 m⋅s^(-1)，B>0.25 m⋅s^(-2))是促進RI發展的重要角色，透過底層輻合上升與潛熱釋放，使高層暖心形成，其相對低壓又促進對流產生，產生由熱力效應所主導之正回饋，有效提高颱風的強度。於RI成熟期，慣性穩定度達到最大值後3小時裏，底層輻合再度增加，搭配中層大量的輻散作用，造成以動力效應為主導的對流，與此同時颱風強度到達峰值，受地形抬升後，颱風登陸澳門。對流分佈與垂直風切有關，上升對流主要集中在下風區，佔有面積雖少，卻完成大量的質量通量傳輸，而下沉對流則集中在上風區左側，有壓抑暖心的作用。
此外，為瞭解海表溫度(Surface Sea Temperautre，SST)對RI的影響，本研究也進行有關海溫敏感度實驗。結果顯示，當SST降低1度時，因加速對流爆發數量減少，導致暖心無法形成，雖仍有RI發展，但高層增溫不明顯。當SST降低2度以上，對流爆發數量大量減少而沒有RI發展。因此，在本個案中高的SST有利於更多的加速對流爆發產生，其導致暖心結構的形成，所以在過程中扮演著主導角色，其數量與成熟度，將影響RI的強度。

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