An Intensification of the Warm and Moist Conveyor Belt of the Asian Summer Monsoon in the “21.7” Henan Rainstorm and Its Key Circulation from the Quasi-geostrophic Potential Vorticity Perspective

Zuowei XIE; Cholaw BUEH; Anran ZHUGE; Ruxu LIAN; Zhenyang LIAO; Jie YAN; Dawei LIN

doi:10.3878/j.issn.1006-9895.2205.22039

Chinese Journal of Atmospheric Sciences > 2022 > 46(5): 1147-1166. > DOI: 10.3878/j.issn.1006-9895.2205.22039

XIE Zuowei, BUEH Cholaw, ZHUGE Anran, et al. 2022. An Intensification of the Warm and Moist Conveyor Belt of the Asian Summer Monsoon in the “21.7” Henan Rainstorm and Its Key Circulation from the Quasi-geostrophic Potential Vorticity Perspective [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 46(5): 1147−1166. DOI: 10.3878/j.issn.1006-9895.2205.22039

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An Intensification of the Warm and Moist Conveyor Belt of the Asian Summer Monsoon in the “21.7” Henan Rainstorm and Its Key Circulation from the Quasi-geostrophic Potential Vorticity Perspective

1.
International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
2.
Hangzhou Xiaoshan Meteorological Bureau, Hangzhou 311200
3.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206
4.
China Meteorological Administration Weather Modificaition Centre, Beijing 100081
5.
Cloud-Precipitation Physics and Weather Modification Key Laboratory, China Meteorological Administration, Beijing 100081

Funds: National Natural Science Foundation of China (Grants 41630424, 41875078), Huaneng Group Technology Project (Phase 1) “Offshore Wind Power and Intelligent Energy System” (Grant HNKJ20-H88)

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Received Date: February 17, 2022
Accepted Date: May 26, 2022
Available Online: May 30, 2022
Published Date: September 21, 2022

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Abstract

Abstract

This study uses rain-gauge observation data, the fifth reanalysis dataset of the European Center for Medium-Range Weather Forecasts, and the piecewise quasi-geostrophic potential vorticity (QGPV) inversion to mainly investigate the intensification of the warm and moist conveyor belt of the Asian summer monsoon of the Henan extreme rainstorm and its key circulation during July 18–21, 2021. The result shows that the continual westward extension of the subtropical high covered eastern China, on whose southwestern flank, broad southwesterlies transported not only a warm and moist air mass but also a high QGPV over Henan to northwestern China. Meanwhile, in northwestern China, the sensible heating of the Alxa Plateau maintained and deepened a local thermal low, which generated high QGPV anomalies in the near-surface layer of the low-pressure center and the middle and lower tropospheres (750–650 hPa) over the Hetao region. Thus, an extensively high QGPV was formed with low-pressure circulation over Henan, which yielded an extensive confrontation with the subtropical high. The QGPV inversion results show that this meteorological circulation pattern in the middle and lower tropospheres intensified the southerly over Henan. The amplified southerly effectively transported a hot and humid air mass of the warm and moist conveyor belt to the Henan region, which was a key factor for the extreme downpour on July 20. The southerly over Henan on July 20 was primarily contributed by the subtropical high, with secondary contributions from the positive QGPV anomaly at the middle and lower tropospheres over Hetao, while the contribution of the local low-pressure circulation over Henan was slightly smaller.
- Henan rainstorm,
- Warm and moist conveyor belt,
- Potential vorticity inversion,
- Subtropical high,
- Thermal low

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References (28)

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An Intensification of the Warm and Moist Conveyor Belt of the Asian Summer Monsoon in the “21.7” Henan Rainstorm and Its Key Circulation from the Quasi-geostrophic Potential Vorticity Perspective

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An Intensification of the Warm and Moist Conveyor Belt of the Asian Summer Monsoon in the “21.7” Henan Rainstorm and Its Key Circulation from the Quasi-geostrophic Potential Vorticity Perspective

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