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| Titel |
Global annual methane emission rate derived from its current atmospheric mixing ratio and estimated lifetime |
| VerfasserIn |
G. R. Sonnemann, M. Grygalashvyly |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 3 ; Nr. 32, no. 3 (2014-03-26), S.277-283 |
| Datensatznummer |
250121040
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| Publikation (Nr.) |
 copernicus.org/angeo-32-277-2014.pdf |
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| Zusammenfassung |
| We use the estimated lifetime of methane (CH4), the current methane
concentration, and its annual growth rate to calculate the global methane
emission rate. The upper and lower limits of the annual global methane
emission rate, depending on loss of CH4 into the stratosphere and
methane consuming bacteria, amounts to 648.0 Mt a−1 and
608.0 Mt a−1. These values are in reasonable agreement with satellite
and with much more accurate in situ measurements of methane. We estimate a
mean tropospheric and mass-weighted temperature related to the reaction rate
and employ a mean OH-concentration to calculate a mean methane lifetime. The
estimated atmospheric lifetime of methane amounts to 8.28 years and 8.84
years, respectively. In order to improve the analysis a realistic
3D-calculations should be performed. |
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