air–sea exchange and gas–particle partitioning of polycyclic aromatic hydrocarbons in the mediterranean
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2014
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Abstract
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 μm. The total deposition
flux of particulate PAHs was 0.3–0.5 μ 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.
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.
| Reference Key |
mulder2014atmosphericairsea
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|---|---|
| Authors | ;M. D. Mulder;A. Heil;P. Kukučka;J. Klánová;J. Kuta;R. Prokeš;F. Sprovieri;G. Lammel |
| Journal | Journal of agricultural and food chemistry |
| Year | 2014 |
| DOI |
10.5194/acp-14-8905-2014
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| URL | |
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