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  Bidirectional air-sea exchange and accumulation of POPs (PAHs, PCBs, OCPs and PBDEs) in the nocturnal marine boundary layer

Lammel, G., Meixner, F. X., Vrana, B., Efstathiou, C. I., Kohoutek, J., Kukucka, P., et al. (2016). Bidirectional air-sea exchange and accumulation of POPs (PAHs, PCBs, OCPs and PBDEs) in the nocturnal marine boundary layer. Atmospheric Chemistry and Physics, 16(10), 6381-6393. doi:10.5194/acp-16-6381-2016.

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 Creators:
Lammel, G.1, Author              
Meixner, F. X.2, Author              
Vrana, Branislav3, Author
Efstathiou, Christos I.3, Author
Kohoutek, Jiri3, Author
Kukucka, Petr3, Author
Mulder, Marie D.3, Author
Pribylova, Petra3, Author
Prokes, Roman3, Author
Rusina, Tatsiana P.3, Author
Song, G.2, Author              
Tsapakis, Manolis3, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              
3external, ou_persistent22              

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 Abstract: As a consequence of long-range transported pollution, air-sea exchange can become a major source of persistent organic pollutants in remote marine environments. The vertical gradients in the air were quantified for 14 species, i.e. four parent polycyclic aromatic hydrocarbons (PAHs), three polychlorinated biphenyls (PCBs), three organochlorine pesticides (OCPs) and two polybrominated diphenylethers (PBDEs) in the gas-phase at a remote coastal site in the southern Aegean Sea in summer. Most vertical gradients were positive (Delta ca center dot Delta z > 0), indicating downward (net depositional) flux. Significant upward (net volatilisational) fluxes were found for three PAHs, mostly during daytime, and for two OCPs, mostly during night-time, as well as for one PCB and one PBDE during part of the measurements. While phenanthrene was deposited, fluoranthene (FLT) and pyrene (PYR) seem to undergo flux oscillation, hereby not following a day-night cycle. Box modelling confirms that volatilisation from the sea surface has significantly contributed to the night-time maxima of OCPs. Fluxes were quantified based on eddy covariance. Deposition fluxes ranged from -28.5 to +1.8aEuro-A mu gaEuro-m(-2)aEuro-day(-1) for PAHs and -3.4 to +0.9aEuro-A mu gaEuro-m(-2)aEuro-day(-1) for halogenated compounds. Dry particle deposition of FLT and PYR did not contribute significantly to the vertical flux.

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 Dates: 2016
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: ISI: 000378354100021
DOI: 10.5194/acp-16-6381-2016
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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geosciences Union
Pages: - Volume / Issue: 16 (10) Sequence Number: - Start / End Page: 6381 - 6393 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016