Observing severe precipitation near complex topography during the Yilan Experiment of Severe Rainfall in 2020 (YESR2020)

Shih Hao Su, Yu Hung Chang, Ching Hwang Liu, Wei Ting Chen, Wei Yu Chang, Jen Ping Chen, Wei Nai Chen, Kao Sheng Chung, Jou Ping Hou, Min Ken Hsieh, Yi Shin Jang, Hung Chi Kuo, Yu Chi Lee, Pay Liam Lin, Ping Yu Lin, Po Hsiung Lin, Min Hui Lo, Sheng Hsiang Wang, Chien Ming Wu, Jing Hwa YangMing Jen Yang

研究成果: 雜誌貢獻期刊論文同行評審

摘要

This study introduces a recent field experiment investigating multiscale terrain–circulation–precipitation interactions. When a synoptic-scale northeasterly wind prevails under the active East Asian winter monsoon, stratocumulus cloud decks with severe rainfall exceeding 100 mm·day−1 frequently occur in the northeastern plain area and adjacent mountains in Yilan, Taiwan. The Yilan Experiment of Severe Rainfall (YESR2020) is a field campaign from November 20, 2020, to November 24, 2020, to survey the physical processes leading to severe wintertime rainfall. The three-dimensional structure of the wind field and the atmospheric environment can be identified through high temporal and spatial resolution sounding observations, which is empowered by the novel Storm Tracker mini-radiosonde. During YESR2020, the continuously collected meteorological data of two northeasterly episodes captured the variability of local-scale wind patterns and the features of the severe rainfall induced by stratocumulus. A preliminary analysis indicated that a local-scale convergence line could appear over the plain area of Yilan under the northeasterly environmental condition. The precipitation hotspot was located in the mountain region of southern Yilan, where the local winds signified turbulence features. Moreover, the severe rainfall of the two northeasterly episodes spotlighted shallow cumulus under stratus with pure warm rain processes. The results of YESR2020 inspire the arrangement of future field observations to explore detailed mechanisms of heavily precipitating stratocumulus over complex topography.

原文???core.languages.en_GB???
頁(從 - 到)1663-1682
頁數20
期刊Quarterly Journal of the Royal Meteorological Society
148
發行號745
DOIs
出版狀態已出版 - 4月 2022

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