Effects of Additional HONO Sources on Visibility over the North China Plain

查看全文 作　　者：LI [1]Ying;AN [1]Junling;Ismail [2]GULTEPE

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences;[2]Cloud Physics and Severe Weather Research Section, Environment Canada,Toronto, Ontario M3H 5T4, Canada

出　　处：《Advances in Atmospheric Sciences》索引2014年第31卷第5期,共12页

基　　金：supported by the Beijing Natural Science Foundation (Grant No.8144054);the Key Project of the Chinese Academy of Sciences (Grant No.XDB05030301);the National Natural Science Foundation of China (Grant No.41175105);the Carbon and Nitrogen Cycle project of the Institute of Atmospheric Physics, Chinese Academy of Sciences 摘　　要：The objective of the present study was to better understand the impacts of the additional sources of nitrous acid(HONO)on visibility, which is an aspect not considered in current air quality models. Simulations of HONO contributions to visibility over the North China Plain(NCP) during August 2007 using the fully coupled Weather Research and Forecasting/Chemistry(WRF/Chem) model were performed, including three additional HONO sources:(1) the reaction of photo-excited nitrogen dioxide(NO*2) with water vapor;(2) the NO2 heterogeneous reaction on aerosol surfaces; and(3) HONO emissions. The model generally reproduced the spatial patterns and diurnal variations of visibility over the NCP well. When the additional HONO sources were included in the simulations, the visibility was occasionally decreased by 20%–30%(3–4 km) in local urban areas of the NCP. Monthly-mean concentrations of NO-3, NH+4, SO2-4and PM2.5were increased by 20%–52%(3–11μg m-3), 10%–38%, 6%–10%, and 6%–11%(9–17 μg m-3), respectively; and in urban areas, monthly-mean accumulationmode number concentrations(AMNC) and surface concentrations of aerosols were enhanced by 15%–20% and 10%–20%,respectively. Overall, the results suggest that increases in concentrations of PM2.5, its hydrophilic components, and AMNC,are key factors for visibility degradation. A proposed conceptual model for the impacts of additional HONO sources on visibility also suggests that visibility estimation should consider the heterogeneous reaction on aerosol surfaces and the enhanced atmospheric oxidation capacity due to additional HONO sources, especially in areas with high mass concentrations of NOxand aerosols. 关键词：中国北方亚硝酸平原可见性空气质量模型非均相反应平均浓度表面浓度

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Effects of Additional HONO Sources on Visibility over the North China Plain

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