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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Development and technical paper
16 Jan 2014
Review status
This discussion paper is a preprint. It has been under review for the journal Geoscientific Model Development (GMD). The revised manuscript was not accepted.
Simulation of trace gases and aerosols over the Indian domain: evaluation of the WRF-Chem model
M. Michael1, A. Yadav1, S. N. Tripathi2,1, V. P. Kanawade1, A. Gaur1, P. Sadavarte3, and C. Venkataraman3 1Department of Civil Engineering, Indian Institute of Technology, Kanpur, India
2Centre for Environmental Science and Engineering, Indian Institute of Technology, Kanpur, India
3Department of Chemical Engineering, Indian Institute of Technology, Mumbai, India
Abstract. The "online" meteorological and chemical transport Weather Research and Forecasting/Chemistry (WRF-Chem) model has been implemented over the Indian subcontinent for three consecutive summers in 2008, 2009 and 2010 to study the aerosol properties over the domain. The model simulated the meteorological parameters, trace gases and particulate matter. Predicted mixing ratios of trace gases (Ozone, carbon monoxide and sulfur dioxide) are compared with ground based observations over Kanpur. Simulated aerosol optical depth are compared with those observed at nine Aerosol Robotic Network stations (AERONET). The simulations show that the aerosol optical depth of the less polluted regions is better simulated compared to that of the locations where the aerosol loading is very high. The vertical profiles of extinction coefficient observed at the Kanpur Micropulse Lidar Network (MPLNET) station is underpredicted by the model by 10 to 50% for altitudes greater than 1.5 km and qualitatively simulate the elevated layers of aerosols. The simulated mass concentration of black carbon shows a correlation coefficient of 0.4 with observations. Vertical profiles of black carbon at various locations have also been compared with observations from an aircraft campaign held during pre-monsoon period of 2008 and 2009. This study shows that WRF-Chem model captures many important features of the observed atmospheric composition during the pre-monsoon season in India.

Citation: Michael, M., Yadav, A., Tripathi, S. N., Kanawade, V. P., Gaur, A., Sadavarte, P., and Venkataraman, C.: Simulation of trace gases and aerosols over the Indian domain: evaluation of the WRF-Chem model, Geosci. Model Dev. Discuss.,, 2014.
M. Michael et al.
M. Michael et al.


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