Impacts of ammonia and nitrogen oxides emissions on fine particle matter pollution and mitigation potential over the Sichuan Basin
YANG Xian-yu1, LYU Ya-qiong2, SHAO Ping1, PAN Yue-peng3, FAN Jin1, WANG Shi-gong1, ZHANG Xiao-ling1, YI Jia-jun1, QIAO Yu-hong4,5, WU Kai1
1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 4. Chongqing Institute of Eco-Environmental Science, Chongqing 401147, China; 5. Chongqing Key Laboratory of Urban Atmospheric Environment Observation and Pollution Control, Chongqing 401147, China
Abstract：In this study, satellite data derived from IASI, OMI and TROPOMI were adopted to infer the trend of ammonia and NOx emissions over 2008~2019 and the weather research forecast model (WRF) and the Community Multiscale Air Quality (CMAQ) were used to assess the environmental consequence of ammonia emissions over the Sichuan Basin in the winter of 2019. Furthermore, sensitivity experiments were performed to evaluate impacts of ammonia or NOx emission reduction and ammonia and nitrogen oxides coordinated emission reduction scenarios on fine particles. The results show that nitrogen oxides emissions increased interannually from 2008 to 2012 and then decreased rapidly from 2013 to 2019, while ammonia columns were relatively stable over 2008~2013 and increased significantly from 2014 onwards. The hotspots of ammonia emissions in the Sichuan Basin were mainly concentrated in southern Sichuan city cluster and Chengdu and surrounding areas where anthropogenic activities were intense. The elevated ammonia emissions were also observed in the northwestern Sichuan city cluster dominated by agricultural sources. Ammonia ions accounted for a relatively high fraction of PM2.5 in southern Sichuan city cluster, up to 11.4%, while its contribution to PM2.5 in the cities of western Sichuan were relatively low. Sensitivity experiments indicate that the coordinated emission regulation in simultaneously reducing 50% NOx and ammonia could effectively diminish the concentrations of ammonium nitrate and ammonium sulfate in PM2.5, therefore reduce fine particulate pollution and improve the regional ambient air quality across the Sichuan Basin.
杨显玉, 吕雅琼, 邵平, 潘月鹏, 樊晋, 王式功, 张小玲, 易家俊, 乔玉红, 吴锴. 四川盆地大气氨与氮氧化物排放对细颗粒物污染的影响及减排潜力[J]. 中国环境科学, 2022, 42(8): 3502-3511.
YANG Xian-yu, LYU Ya-qiong, SHAO Ping, PAN Yue-peng, FAN Jin, WANG Shi-gong, ZHANG Xiao-ling, YI Jia-jun, QIAO Yu-hong, WU Kai. Impacts of ammonia and nitrogen oxides emissions on fine particle matter pollution and mitigation potential over the Sichuan Basin. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3502-3511.
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