本文透過美國氣候預測中心變形技術(Climate Prediction Center MORPHing technique, CMORPH)整 合之衛星反演降雨率資料針對颱風之對流不對稱進行分析，CMORPH所整合之衛星反演降雨率源自於 DMSP (Defense Meteorological Satellite Program)、NOAA (National Oceanic and Atmospheric Administration)、 NASA Aqua (National Aeronautics and Space Administration Aqua)與 TRMM (Tropical Rainfall Measuring Mission's)等低軌道衛星之微波觀測，其資料透過整合之技術可以避免衛星掃描帶不足造成之影響，並可 進行時空解析度更連續且完整之個案分析。 本研究中選取2010至2012年西北太平洋地區共43個颱風進行分析，藉由美國國家環境預測中心 (National Centers for Environmental Prediction , NCEP)風場資料計算環境垂直風切，並結合 CMORPH 衛 星反演降雨率計算颱風對流中心偏移，以分析環境垂直風切與颱風之對流不對稱之關係。在個案分析中 透過 SSMIS (The Special Sensor Microwave Imager/Sounder)微波影像的觀測，發現 CMORPH 反演之降雨 率對於颱風降雨結構的掌握度高，可以呈現同時間SSMIS觀測的颱風降雨特徵。由環境垂直風切方向 與降水分布中心之合成分析，發現颱風之降水分布中心多集中於下風切方向左側，此結果與過去研究之 論點一致。另外，針對不同強度之環境垂直風切與不同強度之颱風所造成降雨結構分布之差異，結果顯 示當垂直風切強度相同而颱風強度較弱時，其本身結構鬆散且不完整，因此受到環境垂直風切作用後很 容易就造成明顯的對流之偏移。當颱風強度越強時，其結構扎實且對流完整性較高，相對比較能抵抗環 境垂直風切之影響，其強對流分布偏移的程度會趨於颱風內核區域。若固定颱風強度時，隨著垂直風切 強度增強，颱風之強對流分布偏移程度也會越來越明顯。另外，為了確認衛星分析方法的準確性與合理性，研究中也作了幾個敏感度測試，針對颱風中心定 位(C850)、降雨率門檻值(R4)及分析區域(Inner和Outer)等差異進行降雨中心位置分布的比較。測試結果 發現，C850、R4兩測試組與本實驗控制組(CTL)的降雨中心分布情形極為相似，且透過Outer測試組和 CTL控制組比較發現，颱風降雨中心分布的變化主要是受外圍之降水分布的偏移所造成，而颱風內核區 域(Inner)之降水偏移分布相較於外圍有更對稱之趨勢。整體而言，降水中心的偏移仍然偏好於下風切方 向左側(均大於50%)，不會因為研究方法的定義改變而產生太大的差異。

Climate Prediction Center MORPHing technique (CMORPH) produces global precipitation analyses at very high spatial and temporal resolution. This technique uses precipitation estimates that have been derived from low orbiter satellite microwave observations exclusively, and whose features are transported via spatial propagation information that is obtained entirely from geostationary satellite IR data. CMORPH incorporate precipitation estimates derived from the passive microwaves aboard the DMSP 13, 14 & 15 (SSM/I), the NOAA-15, 16, 17 & 18 (AMSU-B), and AMSR-E and TMI aboard NASA's Aqua and TRMM spacecraft, respectively. More continuous and complete information on the spatial-temporal resolution analysis through the integration of technology. This study examines the environmental vertical wind shear (VWS) and the inner-core rainfall asymmetry of tropical cyclones (TCs) by the NCEP FNL operational global analysis data and the CMORPH global precipitation estimates from 43 TCs between 2010 and 2012 over the western North Pacific. In cases study sorted in different TC intensity, it is found that the features of rainfall rate from CMORPH retrievals are the same as the characteristics of convection depicted from the observation Special Sensor Microwave Imager/ Sounder (SSMIS). Based on a series of composite analyses, the most distributive centers of TC rainfall (DCTR)were concentrated in the down shear-left side of TC that is consistent with previous studies. In addition, this study investigates the differences of TC rainfall distribution in different strength of environmental VWS and TC intensity. Results show that the obvious displacement of DCTR occur easily within the same environmental VWS strength for weaker TCs. When the TC intensity becomes stronger, its compact structure and high integrity convection are relatively more resistant to the effect of VWS, the DCTR tends to locate in the inner core of TC. As the VWS increases, the DCTR shifts more away from the inner core for the same TC intensity. In order to confirm the accuracy and availability of the analytical method in this study, several sensitivity tests are implemented to compare to original metric (CTL), such as different definition of TC center (C850), threshold of high rainfall rate (R4), and regions of analysis (Inner and Outer). The compared results of the displacement of DCTR are very similar among C850, R4and CTL. Moreover, it is found that the changes of DCTR are dominated by the rainfall of the outer spiral rain bands by comparing the results between Outer and CTL tests. The DCTR of Inner test shows more symmetric than that of Outer test. In overall, there are no obvious difference of DCTR among all sensitivity tests, and it is found that most displacement of DCTR were located at the downshear-left side of TC (more than 50%). This result also represents the composite of DTCR are not obviously influenced by the definition of the analytical method and demonstrates the finding of this study is reasonable.