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| Titel |
A negative feedback between anthropogenic ozone pollution and enhanced ocean emissions of iodine |
| VerfasserIn |
C. Prados-Roman, C. A. Cuevas, R. P. Fernandez, D. E. Kinnison, J.-F. Lamarque, A. Saiz-Lopez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-27), S.2215-2224 |
| Datensatznummer |
250119469
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| Publikation (Nr.) |
 copernicus.org/acp-15-2215-2015.pdf |
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| Zusammenfassung |
| Naturally emitted from the oceans, iodine compounds efficiently destroy
atmospheric ozone and reduce its positive radiative forcing effects in the
troposphere. Emissions of inorganic iodine have been experimentally shown to
depend on the deposition to the oceans of tropospheric ozone, whose
concentrations have significantly increased since 1850 as a result of human
activities. A chemistry–climate model is used herein to quantify the current
ocean emissions of inorganic iodine and assess the impact that the
anthropogenic increase in tropospheric ozone has had on the natural cycle of
iodine in the marine environment since pre-industrial times. Our results
indicate that the human-driven enhancement of tropospheric ozone has doubled
the oceanic inorganic iodine emissions following the reaction of ozone with
iodide at the sea surface. The consequent build-up of atmospheric iodine,
with maximum enhancements of up to 70% with respect to pre-industrial
times in continental pollution outflow regions, has in turn accelerated the
ozone chemical loss over the oceans with strong spatial patterns. We suggest
that this ocean–atmosphere interaction represents a negative geochemical
feedback loop by which current ocean emissions of iodine act as a natural
buffer for ozone pollution and its radiative forcing in the global marine
environment. |
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