西北太平洋地區熱帶氣旋活動對氣候變異度的影響

洪靜慧

doi:10.6342/NTU.2007.00597

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西北太平洋地區熱帶氣旋活動對氣候變異度的影響

TC Contribution to Climate Variability in the Tropical Western Pacific

洪靜慧 , Masters　　Advisor：許晃雄　　Co-advisor ：柯文雄

繁體中文 DOI： 10.6342/NTU.2007.00597

季內震盪；熱帶氣旋；氣候變異度； Intraseasonal Oscillation ； Tropical Cyclone ； Climate Variability

Abstract │ Reference (74) │ Times Cited (3) │ Altmetrics

Abstract 〈TOP〉

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Climate system includes multi-scale interaction. Many scientists have found that typhoons occur mostly in an active monsoon trough environment and are modulated by intraseasonal oscillation. The influence of the large-scale environment on tropical cyclones has been much studied. But relatively little is known about how tropical cyclones affect the large-scale environment. In this study, we attempt to understand the roles of tropical cyclones in affecting the climate variability in the Western North Pacific region.
We remove the TC signals from the original circulation during the typhoon season (JJASO). By comparing the differences between the original and TC-removed fields, we find that TC enhances the positive vorticity collocated with the TC tracks, especially in the typhoon-active years and contributes significantly to the seasonal mean vorticity. The contribution of TC accounts for 60-70% of interannual variability. On the intraseasonal time scale, the 2004 typhoon season is studied because of the strong intraseasonal oscillation signal and large number of TC. It is found that the TC contributes a substantial amount to the 32-76-day variance of 850 hPa vorticity. A study on other years also indicates that the intraseasonal variability is enhanced by the TC activity.  
 Further, we design two experiments with Purdue Regional Model (PRM) and four experiments with NTU-GCM, which were carried out for the entire JJASO period in 2004. Heating, vortex-enhanced, and vortex-removed experiments were then performed for the same period. The contrast between the experiments of different designed was then analyzed to investigate whether and how the intraseasonal variability is affected. The ensemble effect of TC on the intraseasonal variability is indicated by the difference between simulations. Comparing the non-heating and heating simulation results in PRM, the 32-76-day variance of 850hPa vorticity is obviously larger in the later case, and the wavelet analysis shows stronger amplitude in the 30-70-day period band. Also, similar effect shows up in the NTU-GCM simulation, especially in the vortex-enhanced simulation.
The results suggest significant contribution to climate variability. There must be some interaction between tropical cyclones and large-scale environment. Furthermore, if tropical cyclones indeed influence certain climate processes, we need to understand the impact.

Reference ( 74 ) 〈TOP〉

于宜強，許晃雄，柯文雄，鄒治華，許武榮，商文義，2004：普渡區域模式模擬東亞夏季季風之評估。中華民國環境保護學會學刊，第二十七卷第一期，40-56
連結：
于宜強，2007：陸地表過程對東亞夏季季風之影響研究。國立台灣師範大學地球科學系博士論文
連結：
朱容練，2001：AMIP 模式模擬之夏季季內振盪。國立台灣大學大氣科學研究所碩士論文
連結：
黃葳芃，1999：芙蘿颱風(1990)的數值模擬研究。國立台灣大學大氣科學研究所碩士論文
連結：
蘇昱仁，2004：NTU-GCM AMIP 實驗對東亞夏季季風年際變化與可預報度之分析探討。國立台灣大學大氣科學研究所碩士論文
連結：

Times Cited (3) 〈TOP〉

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