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| Titel |
Long-term Studies of Marine Halogen Release |
| VerfasserIn |
J. Tschritter, R. Holla, U. Frieß, U. Platt |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023711
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| Zusammenfassung |
| Institute of Enviromental Physics, Heidelberg, Germany.
Long term measurements of atmospheric trace gases using multi-axis DOAS instruments
are pursued at the new SOLAS observatory on the island of Sao Vicente, (Cape Verde). This
research is part of the SOPRAN (Surface Ocean Processes in the ANthropocene) project
(Fördernummer:03F0462F). Reactive halogen species (RHS) such as bromine- and
iodine- containing species play major roles in the chemistry of ozone in both the
troposphere and lower stratosphere and thus possibly influence the ozone budget on a
global scale. In addition iodine-species emitted from the ocean surface have been
shown to be responsible for the production of new atmospheric particles in the
marine boundary layer. This may have an effect on cloud formation and radiation
transfer on local and global scales. Long term measurements of RHS abundances will
help to identify their key regions and processes for formation. A new long term
Multi-MAX-DOAS instrument has been installed at the SOLAS observatory on the island of
Sao Vicente, (Cape Verde). The main focus of these unique measurements is the
investigation of reactive halogen chemistry in the subtropical marine boundary layer
based on measurements of BrO, IO, and possibly OIO. Because of its wide spectral
range also the use for O4-retrievals to gain aerosol profiles is possible. IO has been
detected with mixing ratios up to 1.3 ppt. For BrO an upper limit of 2 ppt could be
determined. |
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