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| Titel |
Two decades of OH variability as inferred by an inversion of atmospheric transport and chemistry of methyl chloroform |
| VerfasserIn |
P. Bousquet, D. A. Hauglustaine, P. Peylin, C. Carouge, P. Ciais |
| 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 ; 5, no. 10 ; Nr. 5, no. 10 (2005-10-04), S.2635-2656 |
| Datensatznummer |
250003098
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| Publikation (Nr.) |
 copernicus.org/acp-5-2635-2005.pdf |
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| Zusammenfassung |
| We developed an iterative inverse method to infer inter-annual sources and
sinks of methyl chloroform (MCF) from atmospheric measurements, on a monthly
basis. The methodology is presented and used to estimate two decades of OH
variability between 1980 and 2000, using varying meteorology. When OH
concentrations are adjusted with loose prior errors and MCF emissions are
adjusted within inventory bounds, we show that substantial OH inter-annual
variability (8.5±1.0% of the mean) and trend
(-0.7%.yr-1) are necessary to match MCF observations. This
result is confirmed by a series of sensitivity tests addressing main
limitations of previous studies. However, we show that it is also possible to
match MCF observations with a 65% reduction of OH year-to-year variations
and a 60% reduction of absolute OH trend, but still a consistency of
inferred emissions with inventory values at a ±2σ level. On the
other hand, the phase of inferred OH variations is a more robust feature of
our set of inversions. Overall, MCF inversions can only provide a range of OH
variations unless inventory uncertainties are further reduced. |
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