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Impact of PBL eddy transport on the 20 July 2021 Zhengzhou torrential rainfall
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Chengzhi YE1, 2, Rui CHENG3, Zejun DAI1, 4, Yang WANG3, Jingjing CHEN1, 4, Zhenzhen WU1, 2
Acta Meteorologica Sinica | 2025, 83(5) : 1258 - 1270
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Acta Meteorologica Sinica | 2025, 83(5): 1258-1270
• Articles •
Impact of PBL eddy transport on the 20 July 2021 Zhengzhou torrential rainfall
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Chengzhi YE1, 2, Rui CHENG3, Zejun DAI1, 4, Yang WANG3, Jingjing CHEN1, 4, Zhenzhen WU1, 2
Affiliations
  • 1.Hunan Key Laboratory of Meteorological Disaster Prevention and Reduction，Changsha 410118，China
  • 2.Hunan Institute of Meteorological Science，Changsha 410118，China
  • 3.State Key Laboratory of Geo-Information Engineering，Xi'an 710054，China
  • 4.Hunan Meteorological Observatory，Changsha 410118，China
Published: 2025-10-10 doi: 10.11676/qxxb2025.20240051
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The "7.20" Zhengzhou torrential rainfall is the most severe storm in the 21st century, characterized by long persistence and intense hourly precipitation. Through comparative analysis of PBL (Planetary Boundary Layer) eddy transport for this instantaneous precipitation process, this study attempts to investigate PBL structure and turbulent diffusion impacts on heavy precipitation intensity. Three comparative experiments are conducted by tuning coefficients of local eddy diffusion and counter-gradient term. Results show that PBL turbulent transport has strong influences on severe hourly precipitation during the "7.20" Zhengzhou torrential rainfall event. It is found through comparison that the decrease in local eddy diffusion noticeably leads to weakening in precipitation intensity and the counter-gradient term mainly results in changes in rainfall location and evolution. Furthermore, PBL eddy transport can modulate large-scale atmospheric conditions for heavy storms, such as local water vapor supply and atmospheric instability. Finally, the eddy vapor and heat transports can notably modify the distribution, intensity and evolution of moisture flux convergence and PBL atmospheric instability, and thus exhibit great influences on this severe storm simulation.

PBL turbulent transport  /  Zhengzhou torrential rainfall  /  Precipitation intensity  /  Numerical simulation  /  AREM model
Chengzhi YE, Rui CHENG, Zejun DAI, Yang WANG, Jingjing CHEN, Zhenzhen WU. Impact of PBL eddy transport on the 20 July 2021 Zhengzhou torrential rainfall[J]. Acta Meteorologica Sinica, 2025 , 83 (5) : 1258 -1270 . DOI: 10.11676/qxxb2025.20240051
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Article Info
doi: 10.11676/qxxb2025.20240051
  • Receive Date：2024-04-18
  • Online Date：2026-03-27
  • Published：2025-10-10
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History
  • Received：2024-04-18
  • Revised：2025-02-12
Funding
Affiliations
    1.Hunan Key Laboratory of Meteorological Disaster Prevention and Reduction，Changsha 410118，China
    2.Hunan Institute of Meteorological Science，Changsha 410118，China
    3.State Key Laboratory of Geo-Information Engineering，Xi'an 710054，China
    4.Hunan Meteorological Observatory，Changsha 410118，China
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https://castjournals.cast.org.cn/joweb/qxxb/EN/10.11676/qxxb2025.20240051
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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