文化大學機構典藏 CCUR:Item 987654321/28091
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    Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/28091


    Title: 氣溶膠對熱帶降水的遠程影響
    Remote impacts of aerosols on tropical precipitation
    Authors: 陳其杰
    Chen, Chi-Chieh
    Contributors: 地學研究所大氣科學組
    Keywords: 氣溶膠
    熱帶降水
    異常粗濕穩定度
    aerosols
    remote impacts
    tropical precipitation
    upped-ante mechanism
    anomalous gross moist stability mechanism
    Date: 2014-07
    Issue Date: 2014-09-05 15:48:54 (UTC+8)
    Abstract: 人造氣溶膠會經由改變雲物理機制,透過直接與間接效應影響太陽輻射的收支平衡,並通過未知的過程而改變對流層溫度,造成全球性的冷卻,進而影響熱帶地區降水,在選定的四組Coupled Model Intercomparison Project Phase 5 (CMIP5)模式中都可以發現相同的反應;氣溶膠冷卻的空間分布與溫室氣體造成全球暖化的空間分布相似,造成的熱帶地區降水變化也類似,只是符號相反。

    氣溶膠造成的全球性冷卻對熱帶降水的遠程影響涉及無法完全解釋的複雜熱力、動力過程,通過分析水氣、濕靜能平衡之熱力項、動力項、平流項等分項,得出動力項為降水改變的主因;熱力項則與異常粗濕穩定度(M ́)機制相關,透過地表與低層大氣的冷卻,改變水氣在垂直方向上的分布而產生,減少深對流降水和增加淺對流降水,與暖化的改變相反;平流項則與upped-ante機制相關,通過影響對流區邊緣的水氣移入而改變,增加對流區邊緣降水,同樣與暖化下的變化相反。因此可以得出,氣溶膠冷卻效應與溫室氣體的暖化效應,降水的改變是透過相同的機制而變化。
    Appears in Collections:[Department of Geography & Graduate Institute of Earth Science / Geography ] thesis

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