Proceeding of 1st International Conference on Environmental Protection and Disaster RISKs, 2020, DOI: https://doi.org/10.48365/ENVR-2020.1.42
Emilia Georgieva, Elena Hristova, Blagorodka Veleva

The objective of this work is to investigate the influence of Saharan dust events on the chemical composition of rain samples collected at three sites in Bulgaria during 2017-2018. Saharan dust intrusions were identified through a combination of satellite retrieved aerosol data and results from dust forecasting models and from backward trajectory model. The chemical composition of the samples (acidity pH, conductivity EC, main ions and elements) is analysed in view of the direction of the approaching air masses – “direct” influence (south-west), and “indirect” influence from other directions and regions, already impacted by Saharan dust. All samples were characterised by elevated values of pH (max 7.4), EC (max 202 µS.cm-1) and Si, Ca, Fe, Mg concentrations. For cases with direct influence Si and Ca values were up to 1.5 and 25 mg.l-1. In most of the indirect cases increased concentrations of sulphate, nitrate and ammonium were observed (up to 39.5, 23.1 and 8.3 mg.l-1).

precipitation chemistry, Saharan dust, field campaigns, dust models, satellite AOD

This study was inspired by COST16202 “inDust”, and was partially funded by the Bulgarian National Science Fund trough contract N. DN-04/4-15.12.2016, and the European Space Agency through contract No. 4000124150/18/NL/SC. The Copernicus Atmosphere Monitoring Service is acknowledged for providing analysed and forecasted model data on atmospheric chemistry. We are thankful also to Barcelona Supercomputing Center, WMO SDS-WAS NA ME E Center and the Marine Meteorology Division of U.S. Naval Research Laboratory for providing archives of modelled dust products.

Author information:
Author: Emilia Georgieva
E-mail: emilia.georgieva@meteo.bg
Affiliation: National Institute of Meteorology and Hydrology

Author: Elena Hristova
E-mail: elena.hristova@meteo.bg
Affiliation: National Institute of Meteorology and Hydrology

Author: Blagorodka Veleva
E-mail: blagorodka.veleva@meteo.bg
Affiliation: National Institute of Meteorology and Hydrology

How to cite:
Georgieva, E., Hristova, E., & Veleva, B. (2020). Effect of Saharan Dust Intrusions on Precipitation Chemistry in Bulgaria. Proceeding of 1st International Conference on Environmental Protection and Disaster RISKs, 2020, p. 467-479. https://doi.org/10.48365/ENVR-2020.1.42