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Simulated seasonal variations in nitrogen wet deposition over East Asia

Simulated seasonal variations in nitrogen wet deposition over East Asia

作     者:YU Jin-Hai ZHANG Mei-Gen LI Jia-Lin YU Jin-Hai;ZHANG Mei-Gen;LI Jia-Lin

作者机构:State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences 

出 版 物:《Atmospheric and Oceanic Science Letters》 (大气和海洋科学快报(英文版))

年 卷 期:2016年第9卷第2期

页      面:99-106页

核心收录:

学科分类:07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基  金:supported by the National Basic Research Program of China[grant number 2014CB953802] the "Strategic Priority Research Program(B)" of the Chinese Academy of Sciences[grant numbers XDB05030105,XDB05030102,and XDB05030103] 

主  题:Nitrogen wet deposition CMAQ NH+4∕NO-3 ratio precipitation aerosol concentration 

摘      要:The regional air quality modeling system Regional Atmospheric Modeling System–Community Multiscale Air Quality was applied to estimate the spatial distribution and seasonal variation in nitrogen wet deposition over East Asia in 2010. The simulated results were evaluated by comparing modeled precipitation rates and ion concentrations, such as ammonium(NH_4~+), nitrate(NO_3^-), and sulfate, in rainwater, against observations obtained from Acid Deposition Monitoring Network in East Asia and meteorological stations in China. Comparison of simulated and observed precipitation showed that the modeling system can reproduce seasonal precipitation patterns reasonably well. For major ion species, the simulated results in most cases were in good agreement with those observed. Analysis of the modeled wet deposition distributions indicated that China experiences noticeable variation in wet deposition patterns throughout the year. Nitrogen wet deposition(NH_4~+ + NO_3^-) during summer and spring accounted for 71% of the annual total(3.9 Tg N yr^(-1)), including 42.7% in summer. Precipitation plays a larger role in the seasonal variation of wet deposition; whereas, aerosol concentrations affect its distribution patterns. In China, the amount of annual nitrogen wet deposition ranged from 1 to 18 kg N ha^(-1). Nitrogen in wet deposition was mainly in the form of NH_4~+, accounting for 65.76% of the total amount, and the molar ratio of NH_4~+∕NO_3^- was mostly more than 1, indicating a relatively larger effect from agricultural activities.

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