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Open AccessArticle

Modelling the Effects of Aerosol on Mei-Yu Frontal Precipitation and Physical Processes

1
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 410073, China
2
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100732, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(18), 3802; https://doi.org/10.3390/app9183802
Received: 16 July 2019 / Revised: 6 September 2019 / Accepted: 6 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue Air Pollution)
The Mei-Yu front is a significantly important summer precipitation system in eastern Asia. In recent years, anthropogenic air pollution over the Yangtze-Huaihe region of China has been aggravating continuously. A cloud-resolving model coupled with an idealized frontal model is used to investigate the response of aerosols on the Mei-Yu frontal precipitation. The results indicate that increasing droplet concentrations lead to significant precipitation enhancement with the current pollution levels in Mei-Yu frontal system. Under the polluted conditions, the enhanced cold-cloud process is of great importance. Moreover, with the “towing” of active cold-cloud process, cold-cloud and warm-cloud processes developed mutually. These account for the complicated and special microphysical mechanism for aerosol impacts on Mei-Yu frontal system. Furthermore, two types of “microphysical-dynamic positive feedback loop” caused by the interactions of various physical processes and effects (direct dynamic effect, frontogenesis effect, and vapor pump effect) can be found in the Mei-Yu precipitation, which in turn reinforce the microphysical processes. The combined effect is to increase Mei-Yu front precipitation. The interaction of microphysical processes and dynamic processes, and the positive feedback loops they create are the main physical mechanisms behind the significant impacts of aerosol on Mei-Yu frontal precipitation. This may also be an important feature of climate change in eastern Asia. View Full-Text
Keywords: anthropogenic pollution; climate effect; numerical model; Mei-Yu precipitation; microphysics anthropogenic pollution; climate effect; numerical model; Mei-Yu precipitation; microphysics
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Zhang, Y.; Wu, Z.; Zhang, L.; Xie, Y.; Lei, H.; Zheng, H.; Ma, X. Modelling the Effects of Aerosol on Mei-Yu Frontal Precipitation and Physical Processes. Appl. Sci. 2019, 9, 3802.

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