Simulated Impacts of Sulfate and Nitrate Aerosol Formation on Surface-Layer Ozone Concentrations in China

• Published in: Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao 2014, Vol.7 (5), p.441-446
• Main Author: YANG Yang LIAO Hong LOU Si-Jia
• Format: Article
• Language: English
• Subjects: 中国北方; 化学反应; 模拟; 气溶胶; 硝酸盐; 硫酸盐; 臭氧浓度; 表面层
• ISSN: 1674-2834; 2376-6123
• DOI: 10.1080/16742834.2014.11447204

The authors quantify the impacts of sulfate and nitrate aerosol formation on surface-layer 03 concentrations over China using the one-way nested-grid capa- bility of the global three-dimensional Goddard Earth Ob- serving System chemical transport model （GEOS-Chem）. Chemical reactions associated with sulfate formation are simulated to generally increase 03 concentrations in China. Over the North China Plain （NCP） and the Si- chuan Basin （SCB）, where simulated sulfate concentra- tions are the largest, ozone concentrations show maximum increases in spring by 1.8 ppbv （3.2%） in the NCP and by 2.6 ppbv （3.7%） in the SCB. On the contrary, nitrate formation is simulated to reduce 03 concentrations by up to 1.0 ppbv in eastern China, with the largest reduc- tions of 1.0 ppbv （1.4%） in summer over the NCE Ac- counting for the formation of both sulfate and nitrate, the surface-layer O3 concentrations over a large fraction of eastern China are simulated to increase in winter, spring, and autumn, dominated by the impact of sulfate forma- tion, but to decrease in summer because of the dominant contribution from nitrate formation.