Seasonal Variation of Simulated Carbonaceous Fine Particulate Matter overthe Indian Region by using WRF-Chem with two emission Inventories:EDGAR-HTAP and SAFAR-2018

Seasonal Variation of Simulated Carbonaceous Fine Particulate Matter over
the Indian Region by using WRF-Chem with two emission Inventories:

EDGAR-HTAP and SAFAR-2018

Praveen Kumar1

, Gufran Beig1,4, Vikas Singh2

, B.S. Murthy1

, B.R. Bamniya3

1
Indian Institute of Tropical Meteorology, Pune- 411008
2 National Atmospheric Research Laboratory, Gadanki, AP-517112
3Mohan LalSukhadiya University, Udaipur, 313001

4National Institutes of Advanced Studies (NIAS), Indian Institute of Science (IISc) Campus,

BANGALORE-560012

Abstract:

This study better evaluates Black Carbon (BC) using Weather Research and Forecasting model
coupled with chemistry (WRF-Chem) v3.9.1.1, with newly developed emission inventory
SAFAR-2018 and global one EDGAR-HTAP for the year 2018. The simulation provides a view
of the seasonal and regional pattern BC concentrations, confirmed by comparing surface
meteorological parameters and BC concentrations to the MERRA reanalysis for the Indian
region. It found that the model simulated surface C-PM concentration with SAFAR-2018
emission inventory is slightly overestimated, but simulation with EDGAR emission inventory is
under-estimated than MERRA. It also found that the model-simulated meteorological parameters
( e.g., wind speed at 2 m, the surface temperature at 2 m, and Planetary Boundary Layer height
showed better agreement with observation. Compared to the simulation with EDGAR emission
inventory, simulated geographic patterns of seasonal mean BC with SAFAR-2018 emission
inventory exhibit good agreement with MERRA. In the IGP region, the concentration of BC
showed the highest peak during the winter, followed by the post-monsoon season compared to
other subcontinents of India. The correlation coefficients of annual hourly time series of surface
BC_sf (SAFAR-2018 emission) concentrations with MERRA over India were higher (0.92) with
RMSE 0.45. These correlations were higher than those (EDGAR emission) observed for the
surface BC_ed (R = 0.91 & RMSE = 0.48) concentrations. It appears that model simulation with
SAFAR-2018 emission inventory well-captured pattern and magnitude over the Indian region,
increasing magnitude of BC concentrations may help to quantify better the effect on climate and
atmospheric condition over the Indian region.