Title: Preliminary evaluation of CMAQ modelled wet deposition of sulphur and nitrogen over Bulgaria

Authors: Emilia Georgieva; Elena Hristova; Dimiter Syrakov; Maria Prodanova; Ekaterina Batchvarova

Addresses: National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, Tsarigradsko shose Blvd., 66, 1784 Sofia, Bulgaria ' National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, Tsarigradsko shose Blvd., 66, 1784 Sofia, Bulgaria ' National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, Tsarigradsko shose Blvd., 66, 1784 Sofia, Bulgaria ' National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, Tsarigradsko shose Blvd., 66, 1784 Sofia, Bulgaria ' National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, Tsarigradsko shose Blvd., 66, 1784 Sofia, Bulgaria

Abstract: Wet depositions of sulphur and nitrogen over Bulgaria have been simulated by the WRF-CMAQ system for the period from March to June 2016. Precipitation amounts have been overestimated - the average NMB is 44% for the country and 70% for Sofia. Precipitation chemistry data from Sofia have been used for the estimation of observed sulphur and nitrogen depositions - 602 mg m−2, and 528 mg m−2, respectively. Modelled wet depositions show overestimation, more significant for sulphur deposition (NMB 87%). Precipitation adjustment has been applied as post-processing to model wet depositions. The correction led to decrease in NMB for S wet deposition (9%), while N- monthly depositions were in general underestimated. Possible effects of long-range transport for Sofia have been discussed for two selected periods of a few days.

Keywords: CMAQ; wet deposition; model validation; precipitation chemistry data; precipitation adjustment; nitrogen; sulphur; environmental pollution; long-range effects.

DOI: 10.1504/IJEP.2018.099158

International Journal of Environment and Pollution, 2018 Vol.64 No.1/2/3, pp.161 - 177

Available online: 11 Apr 2019 *

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