Polycyclic aromatic hydrocarbons in atmospheric aerosols and air–sea exchange in the Mediterranean
Author:
Mulder M. D., Heil A., Kukučka P., Klánová J., Kuta J., Prokeš R., Sprovieri F.ORCID, Lammel G.ORCID
Abstract
Abstract. Polycyclic aromatic hydrocarbons (PAH) concentration in air of the central and eastern Mediterranean in summer 2010 was 1.45 (0.30–3.25) ng m−3, with &approx;8% in the particulate phase, associated with particles < 0.25 μm. The diffusive air–sea exchange fluxes of fluoranthene and pyrene were mostly found net-depositional or close to phase equilibrium, while retene was net-volatilisational in a large sea region. Regional fire activity records in combination with box model simulations suggest that seasonal depositional input of retene from biomass burning into the surface waters during summer is followed by an annual reversal of air–sea exchange, while inter-annual variability is dominated by the variability of the fire season. It is concluded that future negative emission trends or interannual variability of regional sources may trigger the sea to become a secondary PAH source through reversal of diffusive air–sea exchange.
Publisher
Copernicus GmbH
Reference53 articles.
1. Albert, M. F. M. A., Schaap, M., Manders, A. M. M., Scannell, C., O'Dowd, C. D., de and Leeuw, G.: Uncertainties in the determination of global sub-micron marine organic matter emissions, Atmos. Environ., 57, 289–300, 2012. 2. Akyüz, M. and Çabuk, H.: Gas-particle partitioning and seasonal variation of polycyclic aromatic hydrocarbons in the atmosphere of Zonguldak, Turkey, Sci. Total Environ., 408, 5550–5558, 2010. 3. Balasubramanian, R. and He, J.: Fate and transfer of persistent organic pollutants in a multimedia environment, in: Urban Airborne Particulate Matter: Origins, Chemistry, Fate and Health Impacts, edited by: Zereini, F. and Wiseman, C. L. S., Springer, Heidelberg, 277–307, 2010. 4. Berrojalbiz, N., Dachs, J., Ojeda, M. J., Valle, M. C., Castro Jiménez, J., Wollgast, J., Ghiani, M., Hanke, G., and Zaldivar, J. M.: Biogeochemical and physical controls on concentrations of polycyclic aromatic hydrocarbons in water and plankton of the Mediterranean and Black Seas, Global Biogeochem. Cy., 25, GB4003, https://doi.org/10.1029/2010GB003775, 2011. 5. Bidleman, T. F. and McConnell, L. L.: A review of field experiments to determine air–water gas-exchange of persistent organic pollutants, Sci. Total Environ., 159, 101–107, 1995.
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