Aerosols, ozone and CO2 under sea-breeze conditions at a Black Sea coastal site

Air quality in urban areas located in complex terrain is intimately related to meteorological phenomena that occur in such regions. Major meteorological factors that determine the concentrations of air pollutants are the wind field and the turbulent diffusion. In this study, we investigate the characteristics of the sea breeze and their influence on aerosol particles, ozone and CO2 concentrations around Ahtopol, a small town located at the southern Bulgarian Black Sea coast. Field experiment, performed from 24 to 29 August 2017, comprised measurements of meteorological parameters, aerosol particle number with 6-channel Aerosol Particle counters, atmospheric optical depth (AOD) and total ozone content (TOC) with Microtops II solar photometer and ozonometer, correspondingly. The statistical analysis revealed that onset and cessation periods of the sea breeze were from 9:00 to 10:00 and from 19:00 to 21:00 LST, respectively. The average maximum strength of the sea breeze was 3-4 ms−1. Studying the variation of aerosol particles and CO2, it is concluded that the sea breeze onset is associate with decrease of small particles number, and decrease of CO2 concentration.Air quality in urban areas located in complex terrain is intimately related to meteorological phenomena that occur in such regions. Major meteorological factors that determine the concentrations of air pollutants are the wind field and the turbulent diffusion. In this study, we investigate the characteristics of the sea breeze and their influence on aerosol particles, ozone and CO2 concentrations around Ahtopol, a small town located at the southern Bulgarian Black Sea coast. Field experiment, performed from 24 to 29 August 2017, comprised measurements of meteorological parameters, aerosol particle number with 6-channel Aerosol Particle counters, atmospheric optical depth (AOD) and total ozone content (TOC) with Microtops II solar photometer and ozonometer, correspondingly. The statistical analysis revealed that onset and cessation periods of the sea breeze were from 9:00 to 10:00 and from 19:00 to 21:00 LST, respectively. The average maximum strength of the sea breeze was 3-4 ms−1. Studying the variation ...