气候变化领域集成服务门户(CCPortal): Contribution of local and remote anthropogenic aerosols to a record-breaking torrential rainfall event in Guangdong Province, China

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DOI	10.5194/acp-20-223-2020
	Contribution of local and remote anthropogenic aerosols to a record-breaking torrential rainfall event in Guangdong Province, China
	Liu Z.; Ming Y.; Zhao C.; Cheung Lau N.; Guo J.; Bollasina M.; Hung Lam Yim S.
发表日期	2020
ISSN	16807316
起始页码	223
结束页码	241
卷号	20 期号:1
英文摘要	A torrential rainfall case, which happened in Guangdong Province during 14-16 December 2013, broke the historical rainfall record in the province in terms of duration, affected area, and accumulative precipitation. The influence of anthropogenic aerosols on this extreme rainfall event is examined using a coupled meteorology-chemistry-aerosol model. Up to 33.7 mm precipitation enhancement in the estuary and near the coast is mainly attributed to aerosol-cloud interactions (ACI), whereas aerosol-radiation interaction partially offsets 14 % of the precipitation increase. Our further analysis of changes in hydrometeors and latent heat sources suggests that the ACI effects on the intensification of precipitation can be divided into two stages: cold rain enhancement in the former stage followed by warm rain enhancement in the latter. Responses of precipitation to the changes in anthropogenic aerosol concentration from local (i.e., Guangdong Province) and remote (i.e., outside Guangdong Province) sources are also investigated through simulations with reduced aerosol emissions from either local or remote sources. Accumulated aerosol concentration from local sources aggregates mainly near the ground surface and dilutes quickly after the precipitation initiated. By contrast, the aerosols from remote emissions extend up to 8 km above ground and last much longer before decreasing until peak rainfall begins, because aerosols are continuously transported by the strong northerly winds. The patterns of precipitation response to remote and local aerosol concentrations resemble each other. However, compared with local aerosols through warm rain enhancement, remote aerosols contribute more than twice the precipitation increase by intensifying both cold and warm rain, occupying a predominant role. A 10-time emission sensitivity test shows about 10 times the PM2.5 concentration compared with the control run. Cold (warm) rain is drastically enhanced (suppressed) in the 10× run. In response to 10× aerosol emissions, the pattern of precipitation and cloud property changes resembles the differences between CTL and CLEAN, but with a much greater magnitude. The precipitation average over Guangdong decreases by 1.0 mm in the 10× run but increases by 1.4 mm in the control run compared with the CLEAN run. We note that the precipitation increase is concentrated within a more narrowed downstream region of the aerosol source, whereas the precipitation decrease is more dispersed across the upstream region. This indicates that the excessive aerosols not only suppress rainfall, but also change the spatial distribution of precipitation, increasing the rainfall range, thereby potentially exacerbating flood and drought elsewhere. This study highlights the importance of considering aerosols in meteorology to improve extreme weather forecasting. Furthermore, aerosols from remote emissions may outweigh those from local emissions in the convective invigoration effect. © 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; cloud cover; drought; flood; hydrometeorology; precipitation assessment; rainfall; China; Guangdong
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152948
作者单位	Institute of Space and Earth Information Science, Chinese University of Hong Kong, Hong Kong, Hong Kong; Institute of Environment, Energy and Sustainability, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong; School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; Department of Geography and Resource Management, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong; Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, NJ, United States; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
推荐引用方式 GB/T 7714	Liu Z.,Ming Y.,Zhao C.,et al. Contribution of local and remote anthropogenic aerosols to a record-breaking torrential rainfall event in Guangdong Province, China[J],2020,20(1).
APA	Liu Z..,Ming Y..,Zhao C..,Cheung Lau N..,Guo J..,...&Hung Lam Yim S..(2020).Contribution of local and remote anthropogenic aerosols to a record-breaking torrential rainfall event in Guangdong Province, China.Atmospheric Chemistry and Physics,20(1).
MLA	Liu Z.,et al."Contribution of local and remote anthropogenic aerosols to a record-breaking torrential rainfall event in Guangdong Province, China".Atmospheric Chemistry and Physics 20.1(2020).