AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Estimation of Biogenic VOC Emissions and the Corresponding Impact on Ozone and Secondary Organic Aerosol Formation in China
KAI WU, Chengdu University of Information Technology
Abstract Number: 58 Working Group: Aerosol Chemistry
Abstract Biogenic volatile organic compounds (BVOCs) play an important role in global environmental chemistry and climate. In the present work, biogenic emissions from China in 2017 were estimated based on the Model of Emissions of Gases and Aerosols from Nature (MEGAN). Based on the Weather Research and Forecasting (WRF) - Community Multiscale Air Quality (CMAQ) modeling system, the effects of BVOC emissions on ozone and secondary organic aerosol (SOA) formation were investigated. Three parallel scenarios were developed to assess the impact of BVOC emissions on China's ozone and SOA formation in July 2017. Biogenic emissions were estimated at 23.54Tg, with peak in summer and decreasing from South China to North. According to the standard CMAQ output, high ozone concentrations were mainly concentrated in the north, especially in the JJJ (Jin-Jing-Ji region), SCB (Sichuan Basin) and YRD (Yangtze River Delta). The high BVOC emissions across eastern and southwestern China increased surface ozone levels, particularly in the JJJ, YRD, SCB and central PRD (Pearl River Delta) regions, with augments of up to 47 µg m−3 due to the sensitivity of VOC-limited urban areas. In addition, BVOC emissions made a large contribution to summertime SOA levels (national average of 60%).