Budgets of rotational and divergent kinetic energy in the warm-sector torrential rains over South China: a case study

The contributions of divergent and rotational wind components to the kinetic energy budget during a record-breaking rainstorm on 7 May 2017 over South China are examined. This warm-sector extreme precipitation caused historical maximum of 382.6 mm accumulated rainfall in 3 h over the Pearl River Del...

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Bibliographic Details
Published in:Meteorology and atmospheric physics 2021-06, Vol.133 (3), p.759-769
Main Authors: Zhong, Shui-Xin, Meng, Wei-Guang, Tian, Fu-You
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric precipitations
Atmospheric Sciences
Baroclinic flow
Components
Earth and Environmental Science
Earth Sciences
Energy
Energy budget
Extreme weather
Kinetic energy
Math. Appl. in Environmental Science
Meteorology
Original Paper
Precipitation
Rain
Rainfall
Rainstorms
Regions
Terrestrial Pollution
Velocity potential
Vertical flux
Waste Water Technology
Water Management
Water Pollution Control
Wind
Wind speed
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Summary:The contributions of divergent and rotational wind components to the kinetic energy budget during a record-breaking rainstorm on 7 May 2017 over South China are examined. This warm-sector extreme precipitation caused historical maximum of 382.6 mm accumulated rainfall in 3 h over the Pearl River Delta (PRD) regions in South China. Results show that there was a high low-level southerly wind-speed tongue stretching into the PRD regions from the northeast of the South China Sea (SCS) during this extreme precipitation. The velocity potential exhibited a low-value center as well as a low-level divergence-center over the SCS. The rotational components of the kinetic energy (KR)-related terms were the main contribution-terms of the kinetic energy budget. The main contribution-terms of KR and the divergent component of kinetic energy (KD) were the barotropical and baroclinic processes-related terms due to cross-contour flow and the vertical flux divergence.
ISSN:0177-7971
1436-5065
DOI:10.1007/s00703-021-00778-1