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| Titel |
Halogen chemistry at the Cape Verde islands - A model study |
| VerfasserIn |
Roberto Sommariva, Roland von Glasow |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050820
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| Zusammenfassung |
| This paper reports the results of a model study of halogenated species (chlorine, bromine,
iodine) in the tropical marine boundary layer (MBL). Measurements of inorganic halogens
(Cl2, HOCl, BrO, IO) have been made at the Atmospheric Observatory on Sao Vicente island
(Cape Verde) in 2007 and 2009; these observations have shown that significant concentrations
of chlorine, bromine and iodine species are present in the tropical MBL throughout the
year.
We have used a one-dimensional model (MISTRA v7.4.1) to simulate the observed
concentrations of HOCl, Cl2, IO and BrO and study the chemical processes in which these
species are involved. The model includes a detailed description of the meteorology and the
microphysics and an up-to-date gas and aqueous phase chemical mechanisms.
Using the model results and the field observations we found that the fluxes of
organic iodine are not able to explain the observations of inorganic iodine in Cape
Verde, which suggests that other sources may exist in the open ocean. The model
results were used to investigate the impact of the observed levels of halogens on the
concentrations of ozone and of dimethyl sulphide (DMS) in the tropical MBL and how
they impact the nitrogen and sulphur budgets. These results will be discussed in
detail. |
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