Statistical Analysis of Moisture Sources and Quantitative Contribution of Cold Vortex Rainstorms in Northeast China During Warm Season

Yuting Yang aKey Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
eUniversity of Chinese Academy of Sciences, Beijing, China

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Xiaopeng Cui aKey Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
bState Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
cCollaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing, China
dThe Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, China
eUniversity of Chinese Academy of Sciences, Beijing, China

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Ying Li bState Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China

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Lijun Huang fZhejiang Institute of Meteorological Sciences, Hangzhou, China

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Jia Tian aKey Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
eUniversity of Chinese Academy of Sciences, Beijing, China

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Abstract

The northeast cold vortex (NECV) is an essential system in the northeast region of China (NER). Understanding the moisture source and associated transport characteristics of NECV rainstorms is key to the knowledge of its mechanisms. In this study, we focus on two NECV rainstorm centers during the warm season (May-September) from 2008 to 2013. The FLEXPART model and quantitative contribution analysis method are applied to reveal the moisture sources and their quantitative contribution. The results demonstrate that for the northern NECV rainstorm center (R1), Northeast Asia (35.66%), east-central China and its coastal regions (29.14%) make prominent moisture contributions, followed by R1 (11.37%). Whereas east-central China and its coastal regions (45.16%), the southern NECV rainstorm center itself (R2, 17.90%) and the Northwest Pacific (10.24%) principally contribute to R2. Moisture uptake of Northeast Asia differs between R1 and R2, which could serve as one of the vital indicators to judge where NECV rainstorm falls in NER. Moisture from the Arabian Sea, the Bay of Bengal, and the South China Sea, suffers massive en-route loss, although these sources’ contribution and uptake are positively correlated with the intensity and scale of NECV rainstorms in the two centers. There exists inter-month and geographical variability in NECV rainstorms when the main moisture source region contributes the most. Regulated by the atmospheric circulation and the East Asian summer monsoon, the particle trajectories and source contributions of NECV rainstorms vary from month to month. Sources’ contribution also turns out to be diverse in the overall warm season.

© 2024 American Meteorological Society. This is an Author Accepted Manuscript distributed under the terms of the default AMS reuse license. For information regarding reuse and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Xiaopeng Cui, xpcui@mail.iap.ac.cn

Abstract

The northeast cold vortex (NECV) is an essential system in the northeast region of China (NER). Understanding the moisture source and associated transport characteristics of NECV rainstorms is key to the knowledge of its mechanisms. In this study, we focus on two NECV rainstorm centers during the warm season (May-September) from 2008 to 2013. The FLEXPART model and quantitative contribution analysis method are applied to reveal the moisture sources and their quantitative contribution. The results demonstrate that for the northern NECV rainstorm center (R1), Northeast Asia (35.66%), east-central China and its coastal regions (29.14%) make prominent moisture contributions, followed by R1 (11.37%). Whereas east-central China and its coastal regions (45.16%), the southern NECV rainstorm center itself (R2, 17.90%) and the Northwest Pacific (10.24%) principally contribute to R2. Moisture uptake of Northeast Asia differs between R1 and R2, which could serve as one of the vital indicators to judge where NECV rainstorm falls in NER. Moisture from the Arabian Sea, the Bay of Bengal, and the South China Sea, suffers massive en-route loss, although these sources’ contribution and uptake are positively correlated with the intensity and scale of NECV rainstorms in the two centers. There exists inter-month and geographical variability in NECV rainstorms when the main moisture source region contributes the most. Regulated by the atmospheric circulation and the East Asian summer monsoon, the particle trajectories and source contributions of NECV rainstorms vary from month to month. Sources’ contribution also turns out to be diverse in the overall warm season.

© 2024 American Meteorological Society. This is an Author Accepted Manuscript distributed under the terms of the default AMS reuse license. For information regarding reuse and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Xiaopeng Cui, xpcui@mail.iap.ac.cn
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