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Simulation of atmospheric nitrogen deposition in China in 2010

ZHENG Dan-nan;WANG Xue-song;XIE Shao-dong;DUAN Lei;CHEN Dong-sheng;State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University;School of Environment,Tsinghua University;College of Environmental and Energy Engineering,Beijing University of Technology;  
The Community Multiscale Air Quality(CMAQ) modeling system was applied to simulate the atmospheric nitrogen(N) deposition in China during 2010. The budget of N deposition for China was 7.6×103Gg in 2010, which was dominated by deposition of reduced nitrogen(accounting for 2/3). N deposition was highest in summer and lowest in winter. Dry deposition was the predominant form of N deposition(accounting for 62%), mainly contributed by the gaseous nitrogen pollutants, while wet deposition was mainly attributed to particulate ammonium and nitrate. The N deposition varied greatly in space, with high values in the east and low in the west. Specifically, high N deposition was found in the North China Plain, the Sichuan Basin, southern central of Central China, Guangdong and Guangxi, and parts of the Northeast. Thus, reduction of N deposition in China would depend on the control of emissions of ammonia, as well as those of nitrogen oxide in the developed eastern coastal areas.
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