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| 題 名 | 太平洋經向模態對臺灣熱浪的年代際影響=Decadal Link between the Pacific Meridional Mode and Taiwan's Summer Heatwaves |
|---|---|
| 作 者 | 蔡睫葶; 王懌琪; 曾琬鈴; 羅敏輝; 洪志誠; 羅資婷; | 書刊名 | 大氣科學 |
| 卷 期 | 53:2 2025.09[民114.09] |
| 頁 次 | 頁62-83 |
| 分類號 | 328.4 |
| 關鍵詞 | 太平洋經向模態; 年代際夏季溫度變化; 熱浪; 遙相關; Pacific meridional mode; Decadal summer temperatures variation; Heatwaves; Teleconnection; |
| 語 文 | 中文(Chinese) |
| DOI | 10.53106/025400022025095302001 |
| 中文摘要 | 隨著全球氣候變遷加劇,臺灣夏季熱浪事件的頻率與強度逐步升高,將成為人口及 社會安全的一大隱憂,因此,我們需要對臺灣熱浪在未來年代際的變化有更多的瞭解, 以提前做出中長期的調適措施。太平洋經向模態(Pacific Meridional Mode;PMM)是一 個發生在東太平洋,南北向海水溫度增溫的年代際氣候變異,研究顯示,當 PMM 增強 時,東亞地區的極端高溫事件不僅更頻繁,強度也更強,而臺灣夏季氣溫亦在年代際尺 度上顯著升高。然而,臺灣的 PMM 與熱浪之間的關聯性卻尚未被充分探討。本研究旨 在釐清 PMM 與臺灣夏季溫度之間的關係,並探討其中的物理與動力機制,此外,進一 步分析 PMM 增強時對臺灣熱浪事件的影響。研究結果顯示,PMM 是影響臺灣夏季溫 度在年代際尺度上變化的主要因素,當 PMM 增強時,東太平洋上空的氣流上升並在高 層發散,其中部分氣流向西傳播,跨越太平洋,最終於西太平洋約東經 120° 附近下沉, 使臺灣處於穩定少雨的天氣狀態,在這種條件下,地表接收的太陽短波輻射增多,導致 臺灣夏季氣溫上升,此外,當 PMM 處於正相位時,熱浪發生的頻率與持續時間亦增加。 本研究有助於提升我們對臺灣夏季氣溫年代際變化的理解,並提供更多的資訊給各領域 的專家制定中長期氣候調適計畫。 |
| 英文摘要 | With the intensification of global climate change, the frequency and intensity of summer heatwaves in Taiwan have been increasing, posing significant risks to public health and social stability. Understanding the decadal variability of heatwaves is essential for developing long- term adaptation strategies. The Pacific Meridional Mode (PMM) is a decadal-scale climate variability characterized by north-south SST anomalies in the eastern Pacific. Studies indicate that an intensified PMM is associated with more frequent and severe extreme heat events in parts of Asia, along with a significant rise in Taiwan’s summer temperatures on a decadal scale. However, the relationship between PMM and heatwaves in Taiwan remains largely unexplored. This study investigates the connection between PMM and Taiwan’s summer temperatures, analyzing the underlying physical and dynamical mechanisms. The results reveal that PMM plays a crucial role in decadal variations of Taiwan’s summer climate. When PMM strengthens, ascending air over the eastern Pacific induces upper-level divergence, triggering westward- propagating circulation anomalies that descend near 120°E in the western Pacific. This leads to stable, dry conditions over Taiwan, increasing solar shortwave radiation and surface warming. Furthermore, during the positive phase of PMM, heatwave frequency and duration also increase. These findings enhance our understanding of decadal-scale summer temperature variability in Taiwan and provide critical insights for policymakers and climate adaptation planning. |
本系統中英文摘要資訊取自各篇刊載內容。