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Air-sea exchange and gas-particle partitioning of polycyclic aromatic hydrocarbons in the Mediterranean
Masaryk University, Research Centre for Toxic Compounds in the Environment, Brno, Czech Republic.
Helmholtz Research Centre Jülich, Institute for Energy {&} Climate Research, Jülich, Germany.
Masaryk University, Research Centre for Toxic Compounds in the Environment, Brno, Czech Republic. (MTM)ORCID iD: 0000-0003-1733-8334
Masaryk University, Research Centre for Toxic Compounds in the Environment, Brno, Czech Republic.
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2014 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 14, no 17, 8905-8915 p.Article in journal (Refereed) Published
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Text
Abstract [en]

Polycyclic aromatic hydrocarbon (PAH) concentration in air of the central and eastern Mediterranean in summer 2010 was 1.45 (0.30-3.25) ng m(-3) (sum of 25 PAHs), with 8 (1-17) % in the particulate phase, almost exclusively associated with particles <0.25 mu m. The total deposition flux of particulate PAHs was 0.3-0.5 mu g m(-2) yr(-1). 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 interannual variability is dominated by the variability of the fire season. One-third of primary retene sources to the sea region in the period 2005-2010 returned to the atmosphere as secondary emissions from surface seawaters. 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.

Capsule: In late summer the seawater surface in the Mediterranean has turned into a temporary secondary source of PAH, obviously related to biomass burning in the region.

Place, publisher, year, edition, pages
Copernicus Publications , 2014. Vol. 14, no 17, 8905-8915 p.
National Category
Environmental Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-49783DOI: 10.5194/acp-14-8905-2014ISI: 000341992000004Scopus ID: 2-s2.0-84906871613OAI: oai:DiVA.org:oru-49783DiVA: diva2:918893
Note

Funding Agencies:

Granting Agency of the Czech Republic (GACR project) P503/11/1230

European Commission (European Structural Funds project) CZ.1.05/2.1.00/01.0001  CETO-COEN

European Social Fund

State budget of the Czech Republic

Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2017-10-17Bibliographically approved

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