https://scholars.lib.ntu.edu.tw/handle/123456789/606328
標題: | Asymmetric Structures of a Squall-Line MCS over Taiwan with Significant Hydraulic Jumps | 作者: | Pan Y.-T MING-JEN YANG |
關鍵字: | Froude number;Hydraulic jump;Squall-line MCS;Taiwan topography | 公開日期: | 2021 | 來源出版物: | Asia-Pacific Journal of Atmospheric Sciences | 摘要: | On 19 April 2019, a mature squall-line mesoscale convective system (MCS) with the characteristics of a leading convective line and trailing stratiform landed on Taiwan, resulting in strong gust wind and heavy rainfall. This squall-line MCS became asymmetric after landfall on Taiwan. Two sets of idealized numerical simulations (mountain heights and low-level vertical wind shear) using the Weather Research and Forecasting (WRF) model were conducted to examine the impacts of realistic Taiwan topography on a squall-line MCS. Results showed numerous similarities between the idealized simulations and real-case observations. The low-level Froude number which considered the terrain height (Fmt) was calculated to examine the blocking effect of the Taiwan terrain, and the cold pool (determined by ??1.5?K isotherm) was found to be completely blocked by the 500-m height contour. The northeast-southwest orientation of the Snow Mountain Range (SMR), and the north–south orientation of the Central Mountain Range (CMR) led to the upwind side asymmetry. On the other hand, the lee-side asymmetry was associated with different intensities and occurrence locations of the hydraulic jump between the SMR and southern CMR, and the cold-pool Froude number (Fcp) indicated the flow-regime transition from subcritical to supercritical. ? 2021, The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117570085&doi=10.1007%2fs13143-021-00262-1&partnerID=40&md5=716348f8f4500a51cb4ce0f6b8a7e04f https://scholars.lib.ntu.edu.tw/handle/123456789/606328 |
ISSN: | 19767633 | DOI: | 10.1007/s13143-021-00262-1 |
顯示於: | 大氣科學系 |
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