EGU21-11154, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Results on an Inter-model Comparison on Secondary Aerosol Formation

Jiani Tan1, Joshua Fu2, Gregory Carmichael3, Hang Su1, and Yafang Cheng1
Jiani Tan et al.
  • 1Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany
  • 2Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA
  • 3Center for Global and Regional Environmental Research, University of Iowa, Iowa City, IA 52242, USA

This study aims at comparing the gas-to-particle conversion mechanisms adopted by regional chemical transport models (CTMs). We use the results from twelve regional CTMs from the third phase of the Model Inter-Comparison Study for Asia (MICS-Asia III). The simulations are conducted over East Asia for the whole year of 2010. The models used are WRF-CMAQ (version 4.7.1 and v5.0.2), WRF-Chem (v3.6.1 and v3.7.1), GEOS-Chem, NHM-Chem, NAQPMS and NU-WRF. Measurements from 54 EANET sites, 86 sites of the Air Pollution Indices (API) and 35 local sites, remote sensing products from AERONET and satellite data from MODIS are used to evaluate model performance on PM10, PM2.5 and its components and aerosol optical depth (AOD). To investigate the inter-model differences in secondary aerosol formation, we compare the Sulfur Oxidation Ratio (SOR) and Nitrogen Oxidation Ratio (NOR) values by different models with observations at the EANET sites. The preliminary results show that the inter-model differences in the oxidation ratio (50%) are almost of the same magnitude as those in simulating the concentrations of particles. The results suggest large uncertainties in the gas-particle conversion process in modelling secondary aerosol formation.

How to cite: Tan, J., Fu, J., Carmichael, G., Su, H., and Cheng, Y.: Results on an Inter-model Comparison on Secondary Aerosol Formation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11154,, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.