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http://www.atmos-chem-phys-discuss.net/8/7217/2008/acpd-8-7217-2008.pdf
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2008-04-14
Consistent simulation of bromine chemistry from the marine boundary layer to the stratosphere, Part I: model description, sea salt aerosols and pH
A. Kerkweg
akerkweg@mpch-mainz.mpg.de
P. Jöckel
A. Pozzer
H. Tost
R. Sander
M. Schulz
P. Stier
E. Vignati
J. Wilson
J. Lelieveld
Atmospheric Chemistry Department, Max Planck Institute of Chemistry, P.O. Box 3060, 55020 Mainz, Germany
Institute for Atmospheric Physics, University of Mainz, Germany
Laboratoire des Sciences du Climat et de l'Environnement, CEA-IPSL, Saclay, France
Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK
Joint Research Centre, Institute of Environment and Sustainability, Ispra, Italy
This is the first article of a series presenting a detailed analysis
of bromine chemistry simulated with the atmospheric chemistry general
circulation model ECHAM5/MESSy.
Release from sea salt is an important bromine source, hence the model
explicitly calculates aerosol chemistry and phase partitioning for coarse
mode aerosol particles.
Many processes including chemical reaction rates are
influenced by the particle size distribution, and aerosol associated water
strongly affects the aerosol pH. Knowledge of the aerosol pH is
important as it determines the aerosol chemistry, e.g., the efficiency of
sulphur oxidation and bromine release.
Here, we focus on the simulated sea salt aerosol size distribution and the
coarse mode aerosol pH.
<br><br>
A comparison with available field data shows that the simulated aerosol
distributions agree reasonably well within the range of measurements.
In spite of the small number of aerosol pH measurements and the uncertainty
in its experimental determination, the simulated aerosol pH compares
well with the observations.
The aerosol pH ranges from alkaline aerosol in areas of strong production
down to
pH values of 1 over regions of medium sea salt production and high levels of
gas phase acids, mostly polluted regions over the oceans in the northern
hemisphere.
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