https://scholars.lib.ntu.edu.tw/handle/123456789/606310
標題: | Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan | 作者: | Chang Y.-H Chen W.-T Wu C.-M Moseley C CHIEN-MING WU WEI-TING CHEN |
關鍵字: | aerosol;cloud condensation nucleus;convective system;diurnal variation;large eddy simulation;precipitation (climatology);summer;synoptic meteorology;topography;tracking;Taiwan | 公開日期: | 2021 | 卷: | 21 | 期: | 22 | 起(迄)頁: | 16709-16725 | 來源出版物: | Atmospheric Chemistry and Physics | 摘要: | This study focuses on how aerosols, serving as cloud condensation nuclei (CCN), affect the properties of diurnal precipitation under the weak synoptic weather regime over complex topography, which is a common summertime environmental regime in Taiwan. Semi-realistic large-eddy simulations (LESs) were carried out using TaiwanVVM and driven by idealized observational soundings. We perform object-based tracking analyses, which diagnose both the spatial and temporal connectivity of convective systems, aiming to reduce the variability in convection and align the aerosol effects on the mature stage of the convective life cycle. In the hotspot areas of strong orographic locking processes, the precipitation initiation is postponed significantly when the CCN concentration is increased from the clean scenario to the normal scenario, which prolongs the development of local circulation and convection. For this organized regime, the occurrence of the tracked extreme diurnal precipitating systems is notably enhanced. Also, the 99th percentile of the maximum rain rate, cloud depth, and in-cloud vertical velocity during the lifetime of the diurnal precipitating systems increases by 9.4%, 4.4%, and 1.3%. This study demonstrates that the design of semi-realistic LESs, as well as the object-based tracking analyses, is useful to investigate the responses of orographically driven diurnal convective systems to ambient conditions. ? |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119670677&doi=10.5194%2facp-21-16709-2021&partnerID=40&md5=390da852a74ef37355fbe25eea2a4558 https://scholars.lib.ntu.edu.tw/handle/123456789/606310 |
ISSN: | 16807316 | DOI: | 10.5194/acp-21-16709-2021 |
顯示於: | 大氣科學系 |
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