| 1 | Temporal, Spatial Distribution and Source Simulation Analysis of NO3- in PM2.5 in Beijing City in 2013显示文摘In this paper,the spatial,temporal distribution,transformation and source simulation of NO_3^- were analyzed systematically based on the monitoring data,literature review and numerical simulation(CMAQ4.7.1).Analysis results showed that annual average concentration of NO_3^- in Beijing was between 6.69 and 12.48 μg/m^3 with an increasing trend in recent years;concentration of NO_3^- in Beijing in 2013 was higher in winter and autumn than that in spring and summer and diurnal variation of NO_3^- showed bimodal distribution and spatial distribution of NO_3^- showed significant north-south gradient distribution;annual average NOR in Beijing was between 0.12 and 0.17 while it was between 0.17 and 0.20 during heavy air pollution days in 2013;the average ratio of NO_3^-/SO_4^(2-) was between 0.97 and 1.06 while it was between 1.00 and 1.07 during heavy air pollution days in 2013;the emission sources of Beijing was being changed from fixed source to both fixed and moving sources in feature development;simulated local,external transportation,background and boundary condition were 40%,44%and 16%respectively to the annual average concentration of NO_3^- in Beijing in 2013 while they were 31%,57%and 12%respectively in heavy air pollution days,which indicated that external source played an important role to the concentration of NO_3^- in Beijing. | Xln Liang Cheng Nianllang Cheng Bingfen Meng Fan | 2015 | Meteorological and Environmental Research2015，6，8： | 0 |
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