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The Quantitative Ro...
The Quantitative Role of Moisture and Vertical Motion in Shaping Summer Heavy Rainfall over North China under Two Distinct Large-Scale Weather Patterns
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Li, Jiao (author)
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Zhao, Yang (author)
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- Chen, Deliang, 1961 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences
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Zhao, Ping (author)
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Zhang, Chi (author)
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Wang, Yinjun (author)
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: JOURNAL OF CLIMATE. - 0894-8755 .- 1520-0442. ; 37:8, s. 2655-2672
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https://doi.org/10.1...
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Abstract
Subject headings
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- Two distinct categories of weather patterns, denoted as Type 1 and Type 2, which show higher -thanexpected frequency of summer heavy rainfall days (HRDs) over North China (NC), are selected from nine weather patterns categorized by the self -organizing map algorithm during 1979-2019. The respective HRDs over NC exhibit dissimilar characteristics, with Type 1 showing a northern distribution and Type 2 a southern distribution. The quantitative disparities in terms of moisture content and vertical motion are discussed in reactions to the synoptic -scale patterns associated with HRDs. The outcomes of a 20 -day backward tracking, using the so-called Water Accounting Model-2layers, reveal noteworthy contrasts in moisture sources. Type 1 predominantly receives moisture from the western North Pacific, while Type 2 relies more on contributions from the Arabian Sea, Bay of Bengal, and Eurasia. However, the major moisture sources with grid cells contributing more than 0.01 mm show a consistent cumulative contribution of 77% for Type 1 and 80% for Type 2. The finding suggests that the discrepancy between the two types cannot be solely attributed to moisture supply. Further examination of the transverse and shearwise Q -vector components provides insights into how these distinct weather patterns influence HRDs by the alteration of vertical motion. In Type 1, an upper -level jet entrance induces a thermally direct secondary circulation that enhances vertical motion, while a baroclinic trough plays a dominant role in generating vertical motion in Type 2. Moreover, these unique configurations for each type of weather pattern are not only pre-existing but also intensified during HRDs.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Keyword
- Extreme events
- Classi fi cation
- Water vapor
- Vertical motion
- Hydrologic cycle
Publication and Content Type
- ref (subject category)
- art (subject category)
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