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Assessment of the simulated aerosol optical properties and regional meteorology using WRF-Chem model

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Abstract

The Weather Research and Forecasting model coupled with chemistry (WRF-Chem) has been used to simulate aerosol optical properties and meteorological parameters including rainfall over Pakistan during July 2016. Two identical experiments are designed for simulation. The first one is based on WRF-Chem simulation with feedback from aerosols’ direct and indirect effects, whereas the second one does not include any aerosol effect. The robustness of the model simulations are examined against the data sets obtained from satellite- and ground-based observations. Different meteorological parameters, e.g. temperature, relative humidity, pressure, rainfall distribution, and aerosol optical properties, e.g. aerosol optical depth (AOD), aerosol extinction coefficient, and single scattering albedo (SSA), are simulated reasonably well. The magnitude and spatial distribution of AOD is simulated realistically over the study domain, particularly over eastern and northeastern parts with high aerosol burden due to natural and anthropogenic aerosols. The net atmospheric forcings due to both short waves (SW) and long waves (LW) and the resultant atmospheric heating simulated by the model are positive over the entire study domain with higher values over the northeastern part. It is shown that the rainfall magnitude is reduced by the inclusion of feedback from aerosol direct and indirect effects into the model simulation over different parts of the study area.

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Acknowledgements

The authors would like to thank DAAC NASA team for providing MODIS data and the Principal Investigators, Prof. Brent Holben, and their staff in establishing and maintaining two AERONET sites used in this work. Thanks are due to the GPM, AIRS, and CALIPSO as well as ECMWF science teams for providing data for analysis. The data for model initialization was downloaded from the website https://rda.ucar.edu/datasets/ds083.2/index.html, whereas chemical initial and boundary conditions data, biogenic emissions, biomass burning emissions, and programs used to process these data sets were downloaded from the website https://www.acom.ucar.edu/wrf-chem/. The lead author extends sincere gratitude to the World Meteorological Organization (WMO) and the Nanjing University of Information Science and Technology (NUIST) for providing financial assistance for 3 years PhD study as well as the Pakistan Meteorological Department (PMD) for granting study leave, without which this work would not have been possible.

Funding

This research was supported by the National Key Research and development Program of China (2017YFC1501704, 2016YFA0600703) and Projects of Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, National Satellite Meteorological Center, China Meteorological Administration.

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Correspondence to Gohar Ali or Yansong Bao.

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The authors declare that they have no competing interests.

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Responsible Editor: Zhihua Zhang

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Ali, G., Bao, Y., Asmerom, B. et al. Assessment of the simulated aerosol optical properties and regional meteorology using WRF-Chem model. Arab J Geosci 14, 1871 (2021). https://doi.org/10.1007/s12517-021-08238-1

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  • DOI: https://doi.org/10.1007/s12517-021-08238-1

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