DOI: 10.1002/2017JD027524
Scopus记录号: 2-s2.0-85041011306
论文题名: Enhancement of PM2.5 Concentrations by Aerosol-Meteorology Interactions Over China
作者: Zhang X. ; Zhang Q. ; Hong C. ; Zheng Y. ; Geng G. ; Tong D. ; Zhang Y. ; Zhang X.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 1179
结束页码: 1194
语种: 英语
英文关键词: aerosol
; aerosol-meteorology interaction
; china
; PM2.5
Scopus关键词: aerosol
; atmospheric pollution
; boundary layer
; cloud microphysics
; concentration (composition)
; deposition velocity
; dry deposition
; particulate matter
; radiation budget
; spatial distribution
; temporal distribution
; China
; Sichuan Basin
; Acis
英文摘要: Aerosol-meteorology interactions can change surface aerosol concentrations via different mechanisms such as altering radiation budget or cloud microphysics. However, few studies investigated the impacts of different mechanisms on temporal and spatial distribution of PM2.5 concentrations over China. Here we used the fully coupled Weather Research and Forecasting model with online chemistry (WRF-Chem) to quantify the enhancement of PM2.5 concentrations by aerosol-meteorology feedback in China in 2014 for different seasons and separate the relative impacts of aerosol radiation interactions (ARIs) and aerosol-cloud interactions (ACIs). We found that ARIs and ACIs could increase population-weighted annual mean PM2.5 concentration over China by 4.0 μg/m3 and 1.6 μg/m3, respectively. We found that ARIs play a dominant role in aerosol-meteorology interactions in winter, while the enhancement of PM2.5 concentration by ARIs and ACIs is comparable in other three seasons. ARIs reduced the wintertime monthly mean wind speed and planetary boundary layer (PBL) height by up to 0.1 m/s and 160 m, respectively, but increased the relative humidity by up to 4%, leading to accumulation of pollutants within PBL. Also, ARIs reduced dry deposition velocity of aerosols by up to 20%, resulting in an increase in PM2.5 lifetime and concentrations. ARIs can increase wintertime monthly mean surface PM2.5 concentration by a maximum of 30 μg/m3 in Sichuan Basin. ACIs can also increase PM2.5 concentration with more significant impacts in wet seasons via reduced wet scavenging and enhanced in-cloud chemistry. Dominant processes in PM2.5 enhancement are also clarified in different seasons. Results show that physical process is more important than chemical processes in winter in ARIs, while chemical process of secondary inorganic aerosols production may be crucial in wet seasons via ACIs. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114639
Appears in Collections: 气候减缓与适应
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作者单位: Ministry of Education, Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China; Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, CMA, Beijing, China
Recommended Citation:
Zhang X.,Zhang Q.,Hong C.,et al. Enhancement of PM2.5 Concentrations by Aerosol-Meteorology Interactions Over China[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)