https://scholars.lib.ntu.edu.tw/handle/123456789/571792
標題: | Taiwan rainbands formed in the outer region of tropical cyclones | 作者: | LIN C.-Y CHENG-KU YU |
關鍵字: | Doppler radar; Hurricanes; Offshore oil well production; Storms; Topography; Tropics; Comprehensive examination; Critical factors; National centers for environmental predictions; Orographic blocking; Pressure ridge; Statistical characteristics; Surface observation; Tropical cyclone; Radar measurement; atmospheric blocking; atmospheric convection; Doppler radar; orographic effect; rainband; spatial distribution; storm track; topography; tropical cyclone; typhoon; Taiwan | 公開日期: | 2021 | 卷: | 149 | 期: | 5 | 起(迄)頁: | 1403-1418 | 來源出版物: | Monthly Weather Review | 摘要: | This study used Doppler radar data, surface observations, and National Centers for Environmental Prediction reanalysis data to explore the statistical characteristics of Taiwan rainbands (TRs) that formed in the outer region of tropical cyclones (TCs). A comprehensive examination of the available radar measurements from 2002 to 2017 identified a total of 103 TRs from 44 TC events and showed that approximately 47% of all TCs influencing Taiwan could develop TRs. The spatial distribution of TR formation exhibited a substantial offshore extent, with the highest frequency observed ;25-100 km offshore. The TRs tended to be initiated when the northwestward-moving typhoons passed over the oceanic area northeast of Luzon Island (16°-20°N, 122°-127°E), the Philippines. This track characteristic brought stronger easterly onshore flow to the eastern coast of Taiwan and favored the development of a pronounced coastal pressure ridge. In particular, the offshore convergence caused by upstream deceleration of the onshore flow due to orographic blocking was found to be a primary contributor to the initiation of the TRs. The strength of the observed coastal pressure ridge and its high correlation with the intensity of environmental onshore flow associated with outer circulations of TCs were consistent with the theoretical prediction of pressure distributions generated as incident flow interacted dynamically with the Taiwan topography. Results from the study suggest that the typhoon location relative to the Taiwan landmass is a critical factor determining TR initiation. ? 2021 American Meteorological Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105294091&doi=10.1175%2fMWR-D-20-0216.1&partnerID=40&md5=cca351ce54a832ee2e635d56d4c4455f https://scholars.lib.ntu.edu.tw/handle/123456789/571792 |
ISSN: | 270644 | DOI: | 10.1175/MWR-D-20-0216.1 |
顯示於: | 大氣科學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。