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Environmental Science. 2014, (05) Core

Numerical Modeling Analysis of Secondary Organic Aerosol（SOA） Combined with the Ground-based Measurements in the Pearl River Delta RegionChinese Full Text

GUO Xiao-shuang;SITU Shu-ping;WANG Xue-mei;DING Xiang;WANG Xin-ming;YAN Cai-qing;LI Xiao-ying;ZHENG Mei;School of Environmental Science and Engineering,Sun Yat-sen University;State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;State Key Joint Laboratory of Environment Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University;

Abstract: Two simulations were conducted with different secondary organic aerosol（ SOA） methods—VBS（ volatile basis set） approach and SORGAM（ secondary organic aerosol model）,which have been coupled in the WRF / Chem（ weather research and forecasting model with chemistry） model. Ground-based observation data from 18thto 25thNovember 2008 were used to examine the model performance of SOA in the Pearl River Delta（ PRD） region. The results showed that VBS approach could better reproduce the temporal variation and magnitude of SOA compared with SORGAM,and the mean absolute deviation and correlation coefficient between the observed and the simulated data using VBS approach were- 4. 88 μg·m- 3and 0. 91,respectively,while they were- 5. 32 μg·m- 3and 0. 18 with SORGAM. This is mainly because the VBS approach considers SOA precursors with a wider volatility range and the process of chemical aging in SOA formation. Spatiotemporal distribution of SOA in the PRD from the VBS simulation was also analyzed. The results indicated that the SOA has a significant diurnal variation,and the maximal SOA concentration occurred at noon and in the early afternoon. Because of the transport and the considerable spatial distribution of O3,the SOA concentrations were different in different PRD cities,and the highest concentration of SOA was observed in the downwind area,including Zhongshan, Zhuhai and Jiangmen.
Keywords：

secondary organic aerosol（SOA）; numerical modeling; ground-based measurements; volatile basis set（VBS）; secondary organic aerosol model（SORGAM）; Pearl River Delta（PRD）;

  • DOI：

    10.13227/j.hjkx.2014.05.004

  • Series：

  • Subject：

  • Classification Code：

    X513

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