A modeling study of the impact of heterogeneous reactions on mineral aerosol surfaces on tropospheric chemistry over East Asia--颗粒学报PARTICUOLOGY

Li, J., & Han, Z. (2010). A modeling study of the impact of heterogeneous reactions on mineral aerosol surfaces on tropospheric chemistry over East Asia. Particuology, 8(5), 433-441. https://doi.org/10.1016/j.partic.2010.03.018

A modeling study of the impact of heterogeneous reactions on mineral aerosol surfaces on tropospheric chemistry over East Asia

Jiawei Li, Zhiwei Han^*

Key Laboratory of Regional Climate-Environment Research for Temperate East-Asia (RCE-TEA), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

10.1016/j.partic.2010.03.018

Volume 8, Issue 5, October 2010, Pages 433-441

Received 12 August 2009, Revised 9 February 2010, Accepted 8 March 2010, Available online 9 July 2010.

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

Highlights

Abstract

Nine heterogeneous reactions (uptake of H₂O₂, HNO₃, HO₂, N₂O₅, NO₂, NO₃, O₃, OH and SO₂ on mineral aerosol surfaces) are incorporated into a Regional Air Quality Model System (RAQMS) to investigate their impacts on tropospheric chemistry in East Asia during the dust storm period in March 2006. Comparison with observations shows the model system well represents the behaviors of the gaseous and aerosol species. Most of the reaction probability γ values used for this study are the best estimation specifically for dust samples from deserts of China, derived from analysis of a number of recent laboratory studies. There are large variations in gas and aerosol concentrations while taking heterogeneous reactions on mineral aerosol surface into account, especially during dust storm events. The domain-averaged monthly mean percentage changes in SO₂, NO₂, O₃, HNO₃, NH₃, total sulfate, total nitrate and total ammonium concentrations are −4.4%, −3.8%, −2.1%, −22.0%, 12.7%, 6.6%, 26.1%, and −9.5%, respectively below 3 km. These changes indicate the considerable perturbation of heterogeneous reactions on mineral aerosol surface to tropospheric chemical system and components. The strength of heterogeneous reactions is determined by both reaction probability and gas precursor concentration. Among the nine reactions, dust uptakes of HNO₃, SO₂, and N₂O₅ exert relatively large influences on the other chemical components, whereas the reactions regarding H₂O₂, HO₂, and OH have little impacts.

Graphical abstract

Keywords

Heterogeneous reaction; Mineral aerosol; Tropospheric chemistry; Numerical simulation; Dust storm

文章导读