Volume 148, Issue 745 p. 1663-1682
RESEARCH ARTICLE

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

Shih-Hao Su

Shih-Hao Su

Department of Atmospheric Sciences, Chinese Culture University, Taipei, Taiwan

Contribution: Conceptualization, Data curation, Funding acquisition, ​Investigation, Methodology, Resources, Supervision, Validation, Writing - original draft, Writing - review & editing

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Yu-Hung Chang

Yu-Hung Chang

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Contribution: Conceptualization, Data curation, Formal analysis, ​Investigation, Methodology, Validation, Visualization, Writing - original draft, Writing - review & editing

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Ching-Hwang Liu

Ching-Hwang Liu

Department of Atmospheric Sciences, Chinese Culture University, Taipei, Taiwan

Contribution: Conceptualization, Data curation, ​Investigation, Methodology, Project administration, Resources, Supervision, Validation

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Wei-Ting Chen

Corresponding Author

Wei-Ting Chen

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Correspondence

W.-T. Chen, Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan.

Email: [email protected]

Contribution: Conceptualization, Funding acquisition, ​Investigation, Methodology, Resources, Supervision, Writing - original draft, Writing - review & editing

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Wei-Yu Chang

Wei-Yu Chang

Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan

Contribution: Data curation, Formal analysis, Funding acquisition, ​Investigation, Methodology, Resources, Supervision, Visualization, Writing - review & editing

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Jen-Ping Chen

Jen-Ping Chen

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

International Degree Program in Climate Change and Sustainable Development, National Taiwan University, Taipei, Taiwan

Contribution: ​Investigation, Resources, Software

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Wei-Nai Chen

Wei-Nai Chen

Research Center of Environmental Change, Academia Sinica, Taipei, Taiwan

Contribution: Data curation, ​Investigation, Resources, Supervision

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Kao-Sheng Chung

Kao-Sheng Chung

Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan

Contribution: Data curation, Funding acquisition, ​Investigation, Methodology, Resources, Supervision

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Jou-Ping Hou

Jou-Ping Hou

Department of Environmental Information and Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan

Contribution: Data curation, ​Investigation, Resources, Supervision

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Min-Ken Hsieh

Min-Ken Hsieh

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Central Weather Bureau, Taipei, Taiwan

Contribution: Data curation, Formal analysis, ​Investigation

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Yi-Shin Jang

Yi-Shin Jang

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Contribution: Data curation, ​Investigation

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Hung-Chi Kuo

Hung-Chi Kuo

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Contribution: Conceptualization, Data curation, Funding acquisition, ​Investigation, Methodology, Project administration, Resources, Supervision, Writing - review & editing

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Yu-Chi Lee

Yu-Chi Lee

Central Weather Bureau, Taipei, Taiwan

Contribution: Resources, Supervision

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Pay-Liam Lin

Pay-Liam Lin

Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan

Contribution: Data curation, ​Investigation, Resources, Supervision

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Ping-Yu Lin

Ping-Yu Lin

Central Weather Bureau, Taipei, Taiwan

Contribution: Data curation, Formal analysis

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Po-Hsiung Lin

Po-Hsiung Lin

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

International Degree Program in Climate Change and Sustainable Development, National Taiwan University, Taipei, Taiwan

Contribution: Data curation, ​Investigation, Resources, Supervision

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Min-Hui Lo

Min-Hui Lo

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

International Degree Program in Climate Change and Sustainable Development, National Taiwan University, Taipei, Taiwan

Contribution: Data curation, Funding acquisition, ​Investigation, Methodology, Resources, Supervision, Writing - review & editing

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Sheng-Hsiang Wang

Sheng-Hsiang Wang

Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan

Contribution: Data curation, Funding acquisition, ​Investigation, Methodology, Resources, Supervision, Writing - review & editing

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Chien-Ming Wu

Chien-Ming Wu

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Contribution: Conceptualization, Data curation, Funding acquisition, Methodology, Resources, Software, Writing - review & editing

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Jing-Hwa Yang

Jing-Hwa Yang

Department of Atmospheric Sciences, Chinese Culture University, Taipei, Taiwan

Contribution: Data curation, ​Investigation, Validation

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Ming-Jen Yang

Ming-Jen Yang

Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

Contribution: Data curation, Software

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First published: 23 March 2022
Citations: 2
Funding information Ministry of Science and Technology, Taiwan, Grant/Award Numbers: MOST-108-2119-M-002-022, MOST-110-2123-M-002-007, MOST109-2628-M-002-003-MY3

Abstract

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.

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