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| Titel |
Inverse modeling of global CH4 emissions 2003-2010 using SCIAMACHY satellite retrievals and surface observations |
| VerfasserIn |
P. Bergamaschi, S. Houweling, A. Segers, M. Krol, R. Engelen, C. Frankenberg, R. Scheepmaker, E. Dlugokencky |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063691
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| Zusammenfassung |
| A reanalysis of global CH4 emissions over the period 2003-2010 has been performed based
on the TM5-4DVAR inverse modeling system. We use CH4 satellite retrievals from the
Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY)
instrument onboard Envisat, together with high-accuracy surface observations from
the NOAA Earth System Research Laboratory global cooperative air sampling
network.
Using climatological OH fields, derived global total emissions for the period 2007-2010
are ~20 Tg CH4/yr higher than 2003-2005. Most of this increase is attributed to the
tropics (~10-15 Tg CH4/yr) and mid-latitudes of the northern hemisphere (~5-10 Tg
CH4/yr). No significant trend and only small inter-annual variability is attributed to the
Arctic latitudes. Various sensitivity experiments have been performed investigating
the impact of the SCIAMACHY observations (compared to inversions using only
surface observations), satellite bias correction, OH fields, and a priori emission
inventories on the derived trends and inter-annual variability of CH4 emissions. |
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