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Long-term analysis of methane as retrieved from SCIAMACHY

Christian Frankenberg(1), Ilse Aben(1), Sander Houweling(1) and Peter Bergamaschi(2)

(1) SRON - Netherlands Institute for Space Research, Sorbonnelaan 2, 3584CA Utrecht, Netherlands
(2) European Commission Joint Research Centre, , Ispra, Italy


Methane retrievals from the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) instrument onboard ENVISAT provide important information on atmospheric CH4 sources, particularly in tropical regions which are poorly monitored by in-situ surface observations. Recently, Frankenberg et al. [2008] reported a major revision of SCIAMACHY retrievals due to an update of spectroscopic parameters of water vapor. Here, we analyze the impact of this revision on global and regional CH4 emissions estimates in 2004, using the TM5-4DVAR inverse modeling system. In addition, we will evaluate the potential of SCIAMACHY to unravel the recent rise in methane concentrations by analyzing retrievals and their quality from 2003 through 2007/2008.


Workshop presentation