| Title | Global tropospheric effects of aromatic chemistry with the SAPRC-11 mechanism implemented in GEOS-Chem version 9-02 |
| Authors | Yan, Yingying Cabrera-Perez, David Lin, Jintai Pozzer, Andrea Hu, Lu Millet, Dylan B. Porter, William C. Lelieveld, Jos |
| Affiliation | China Univ Geosci Wuhan, Sch Environm Studies, Dept Atmospher Sci, Wuhan, Hubei, Peoples R China Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Beijing, Peoples R China Max Planck Inst Chem, Atmospher Chem Dept, Mainz, Germany Univ Montana, Dept Chem & Biochem, Missoula, MT 59812 USA Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA |
| Issue Date | 2019 |
| Publisher | GEOSCIENTIFIC MODEL DEVELOPMENT |
| Abstract | The Goddard Earth Observing System with chemistry (GEOS-Chem) model has been updated with the State-wide Air Pollution Research Center version 11 (SAPRC-11) aromatics chemical mechanism, with the purpose of evaluating global and regional effects of the most abundant aromatics (benzene, toluene, xylenes) on the chemical species important for tropospheric oxidation capacity. The model evaluation based on surface and aircraft observations indicates good agreement for aromatics and ozone. A comparison between scenarios in GEOS-Chem with simplified aromatic chemistry (as in the standard setup, with no ozone formation from related peroxy radicals or recycling of NOx) and with the SAPRC-11 scheme reveals relatively slight changes in ozone, the hydroxyl radical, and nitrogen oxides on a global mean basis (1 %-4 %), although remarkable regional differences (5 %-20 %) exist near the source regions. NOx decreases over the source regions and increases in the remote troposphere, due mainly to more efficient transport of peroxyacetyl nitrate (PAN), which is increased with the SAPRC aromatic chemistry. Model ozone mixing ratios with the updated aromatic chemistry increase by up to 5 ppb (more than 10 %), especially in industrially polluted regions. The ozone change is partly due to the direct influence of aromatic oxidation products on ozone production rates, and in part to the altered spatial distribution of NOx that enhances the tropospheric ozone production efficiency. Improved representation of aromatics is important to simulate the tropospheric oxidation. |
| URI | http://hdl.handle.net/20.500.11897/551582 |
| ISSN | 1991-959X |
| DOI | 10.5194/gmd-12-111-2019 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 |
