2005-08-012024-05-16https://scholars.lib.ntu.edu.tw/handle/123456789/667620摘要：本計畫的目的為透過衛星遙測資料之分析，瞭解於不同環境影響下形成颱風時，中尺度結構特徵的變化情形，尤其是初期擾動系統的垂直發展過程（由下層往中層發展或由中層向下發展）。此外，並將利用WRF模式，模擬不同環境影響下之颱風形成過程，尤其是中尺度結構特徵的變化。希望透過衛星資料之分析和數值模擬，瞭解在不同環境條件下，影響颱風形成的重要機制，並釐清環境場和中尺度對流系統，在颱風形成過程中所扮演之角色。全程計畫預計三年完成，本計畫為第一年計畫。 在本計畫中，將搜集1997年以後，颱風形成期間的衛星資料，選取資料時段含蓋較充足的個案進行分析。分析時將根據中尺度結構特徵和環境場特徵（Holland and Ritchie, 1999），將此等個案分類，以探討環境場影響和中尺度過程，在颱風形成過程中所分別扮演的角色。分析時，同時嚐試解析初期擾動的垂直結構，以及其垂直發展過程（top-down或bottom-up），嚐試建立不同環境條件下，伴隨颱風形成的中尺度結構變化之概念模式。 其次，本計畫將選取環境影響較明確且中尺度結構特徵變化較明顯的個案，利用WRF模擬其形成過程。為合理模擬積雲對流過程，<br> Abstract: This proposed study investigates the characteristic development of mesoscale convective systems (MCSs) during tropical cyclogenesis (or tropical cyclone formation). Methodologies used will be both analysis of satellite remote-sensing data and numerical simulations. Cases of cyclogenesis in the western North Pacific (WNP) and the South China Sea (SCS) under different type of situations will be studied in order to clarify the interaction between the large-scale environment and MCSs, and the role played by MCSs during cyclogenesis. This is the first year of a three-year proposal. Various satellite data will be collected covering cyclogensis cases in the WNP and SCS after 1997. The large-scale formation patterns of the cases will be classified according to Ritchie and Holland (1999), and their formation processes analyzed using the satellite data. Particular attention will be paid to depict the vertical development of the initial disturbances, and determine if the top-down or bottom-up process is the favorable one. Conceptual models of the contribution of MCSs to cyclogenesis will also be built up. For numerical simulations, the Weather Research and Forecasting (WRF) model developed in the U.S. National Center for Atmospheric Research (NCAR) with its standard physics packages and also a modified microphysics parameterization scheme (Chen and Liu 2004) will be used. Selection of simulation cases is based on their formation characteristics, availability of large-scale analyses, and that of the satellite data for comparison. The simulation results will be validated with the observational data, and further diagnosed especially on how the MCSs contribute to the intensification of the low-level vorticity of a disturbance during formation under different large-scale environment.颱風颱風形成衛星資料數值模擬typhoontyphoon formationsatellite datanumerical simulation