Modeling nitrate aerosol distributions and its direct radiative forcing in East Asia with RAMS-CMAQ--颗粒学报PARTICUOLOGY

Han, X., Zhang, M., & Zhou, B. (2013). Modeling nitrate aerosol distributions and its direct radiative forcing in East Asia with RAMS-CMAQ. Particuology, 11(3), 256–263. https://doi.org/10.1016/j.partic.2012.09.009

Modeling nitrate aerosol distributions and its direct radiative forcing in East Asia with RAMS-CMAQ

Xiao Han ^a, Meigen Zhang ^a *, Baorong Zhou ^b

a State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
b Xinghua Meteorological Bureau, Jiangsu 225700, China

10.1016/j.partic.2012.09.009

Volume 11, Issue 3, June 2013, Pages 256-263

Received 19 May 2012, Revised 15 August 2012, Accepted 10 September 2012, Available online 5 March 2013.

E-mail: mgzhang@mail.iap.ac.cn

Highlights

► Aerosol optical property/radiative forcing module is incorporated into RAMS-CMAQ modeling system.

► The nitrate mass concentration and radiative forcing in East Asia in 2007 is simulated.

► Modeling system has good ability to reproduce aerosol physico-chemical properties.

► Internal mixing state may enhance the radiative forcing of nitrate.

Abstract

The geographical and seasonal characteristics in nitrate aerosol and its direct radiative forcing over East Asia are analyzed by using the air quality modeling system RAMS-CMAQ coupled with an aerosol optical properties/radiative transfer module. For evaluating the model performance, nitrate ion concentration in precipitation, and mixing ratios of PM₁₀, and some gas precursors of aerosol during the whole year of 2007 are compared against surface observations at 17 stations located in Japan, Korea, and China, and the satellite retrieved NO₂ columns. The comparison shows that the simulated values are generally in good agreement with the observed ones. Simulated monthly averaged values are mostly within a factor of 2 of the measurements at the observation stations. The distribution patterns of NO₂ from simulation and satellite measurement are also similar with each other. Analysis of the distribution features of monthly and yearly averaged mass concentration and direct radiative forcing (DRF) of nitrate indicates that the nitrate aerosol could reach about 25–30% of the total aerosol mass concentration and DRF in Sichuan Basin, Southeast China, and East China where the high mass burden of all major aerosols concentrated. The highest mass concentration and strongest DRF of nitrate could exceed 40 μg/m³ and −5 W/m², respectively. It also indicates that other aerosol species, such as carbonaceous and mineral particles, could obviously influence the nitrate DRF for they are often internally mixed with each other.

Graphical abstract

Keywords

Nitrate aerosol; Direct radiative forcing; CMAQ; EANET; AOD

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