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| Titel |
Numerical modelling of methyl iodide in the eastern tropical Atlantic |
| VerfasserIn |
I. Stemmler, M. Rothe, I. Hense, H. Hepach |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-25), S.4211-4225 |
| Datensatznummer |
250018308
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| Publikation (Nr.) |
 copernicus.org/bg-10-4211-2013.pdf |
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| Zusammenfassung |
| Methyl iodide (CH3I) is a volatile organic halogen compound that
contributes significantly to the transport of iodine from the ocean to the
atmosphere, where it plays an important role in tropospheric chemistry.
CH3I is naturally produced and occurs in the global ocean. The
processes involved in the formation of CH3I, however, are not fully
understood. In fact, there is an ongoing debate whether production by
phytoplankton or photochemical degradation of organic matter is the main
source term. Here, both the biological and photochemical production
mechanisms are considered in a biogeochemical module that is coupled to a
one-dimensional water column model for the eastern tropical Atlantic. The
model is able to reproduce observed subsurface maxima of CH3I
concentrations. But, the dominating source process cannot be clearly
identified as subsurface maxima can occur due to both direct biological and
photochemical production. However, good agreement between the observed and
simulated difference between surface and subsurface methyl iodide
concentrations is achieved only when direct biological production is taken
into account. Production rates for the biological CH3I source that
were derived from published laboratory studies are shown to be inappropriate
for explaining CH3I concentrations in the eastern tropical Atlantic. |
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