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| Titel |
Tropical sources and sinks of carbonyl sulfide observed from space |
| VerfasserIn |
Norbert Glatthor, Michael Höpfner, Ian T. Baker, Joe Berry, Elliott Campbell, Stephan R. Kawa, Gisele Krysztofiak, Björn-Martin Sinnhuber, Gabriele Stiller, Jim Stinecipher, Thomas von Clarmann |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132352
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| Publikation (Nr.) |
 EGU/EGU2016-12852.pdf |
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| Zusammenfassung |
| According to current budget estimations the seasonal variation of carbonyl sulfide (COS) is
governed by oceanic release and vegetation uptake. Its assimilation by plants is assumed to
be similar to the photosynthetic uptake of CO2 but, contrary to the latter process,
to be irreversible. Therefore COS has been suggested as co-tracer of the carbon
cycle. Observations of COS, however, are sparse, especially in tropical regions.
We use the comprehensive data set of spaceborne measurements of the Michelson
Interferometer for Passive Atmospheric Sounding (MIPAS) to analyze its global
distribution. Two major features are observed in the tropical upper troposphere around
250 hPa: enhanced amounts over the western Pacific and the Maritime Continent,
peaking around 550 pptv in boreal summer, and a seasonally varying depletion
of COS extending from tropical South America to Africa. The large-scale COS
depletion, which in austral summer amounts up to -40 pptv as compared to the
rest of the respective latitude band, has not been observed before and reveals the
seasonality of COS uptake through tropical vegetation. The observations can only be
reproduced by global models, when a large vegetation uptake and a corresponding
increase in oceanic emissions as proposed in several recent publications is assumed. |
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