Atmospheric Chemistry and Physics Discussions
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2009
10.5194/acpd-9-24815-2009
http://www.atmos-chem-phys-discuss.net/9/24815/2009/
http://www.atmos-chem-phys-discuss.net/9/24815/2009/acpd-9-24815-2009.html
http://www.atmos-chem-phys-discuss.net/9/24815/2009/acpd-9-24815-2009.pdf
24815
24846
2009-11-19
An investigation of the origins of reactive gaseous mercury in the Mediterranean marine boundary layer
F. Sprovieri
I. M. Hedgecock
N. Pirrone
Institute of Atmospheric Pollution Research, Rende Section, Rende, CS, Italy
Atmospheric mercury concentrations were measured during two oceanographic
cruise campaigns covering the Adriatic Sea, the first during the autumn in
2004 and the second in the summer of 2005. The inclement weather during the
autumn campaign meant that no clear in-situ production of oxidised gas phase
mercury was seen, and that events where high values of Hg<sup>II</sup><sub>(g)</sub>
and/or Hg associated with particulates (Hg<sup>P</sup>) were observed,
were the result of plumes from anthropogenic emission sources. During the
summer campaign however, the by now rather familiar diurnal variation of
Hg<sup>II</sup><sub>(g)</sub> concentration, with maxima around midday, was observed.
Again there were events when high Hg<sup>II</sup><sub>(g)</sub> and particulates
(Hg<sup>P</sup>) concentrations were seen which did not fit with the pattern
of daily in-situ Hg<sup>II</sup><sub>(g)</sub> production, which were traceable, with
the help of back trajectory calculations, to anthropogenic emission sources.
All the emission plumes encountered could be traced back to ports, not all of
which are associated with major industrial installations. It therefore seems
likely in theses cases that the emissions are either due to shipping or to
port activities. Box modelling studies of the summer 2005 campaign show that
although the in-situ production of Hg<sup>II</sup><sub>(g)</sub> occurs in the MBL,
the exact chemical mechanism responsible is difficult to determine. However
given the high O<sub>3</sub> concentrations encountered during this campaign
it seems clear that if Hg<sup>0</sup> does react with O<sub>3</sub>, it does
not produce gas phase Hg<sup>II</sup>, and the reaction between Hg<sup>0</sup>
and OH if it occurs, does not contribute appreciably to
Hg<sup>II</sup><sub>(g)</sub> production.
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