HR: 17:25h
AN: A14C-06    [Abstracts]
TI: Deriving Tropical Methane Emissions From SCIAMACHY Observations
AU: Houweling, S
EM: s.houweling@phys.uu.nl
AF: National Institute for Space Research (SRON), Sorbonnelaan 2, Utrecht, 3584 CA Netherlands
AU: Houweling, S
EM: s.houweling@phys.uu.nl
AF: Institute for Marine and Atmospheric Research Utrecht (IMAU), PO box 80000, Utrecht, 3508 TA Netherlands
AU: * Meirink, J F
EM: meirink@knmi.nl
AF: Royal Netherlands Meteorological Institute (KNMI), PO Box 201, De Bilt, 3730 AE Netherlands
AU: * Meirink, J F
EM: meirink@knmi.nl
AF: Institute for Marine and Atmospheric Research Utrecht (IMAU), PO box 80000, Utrecht, 3508 TA Netherlands
AU: Bergamaschi, P
EM: peter.bergamaschi@jrc.it
AF: European Commission Joint Research Centre, Institute for Environment and Sustainability, TP 280, Ispra, I-21020 Italy
AU: Eskes, H
EM: eskes@knmi.nl
AF: Royal Netherlands Meteorological Institute (KNMI), PO Box 201, De Bilt, 3730 AE Netherlands
AU: Frankenberg, C
EM: Christian.Frankenberg@iup.uni-heidelberg.de
AF: University of Heidelberg, Institute for Environmental Physics, Im Neuenheimer Feld 229, Heidelberg, D-69120 Germany
AU: Gatti, L
EM: lvgatti@net.ipen.br
AF: Atmospheric Chemistry Laboratory, Travessa R, 400, Sao Paulo, CEP 05508- Brazil
AU: Krol, M
EM: krol@phys.uu.nl
AF: National Institute for Space Research (SRON), Sorbonnelaan 2, Utrecht, 3584 CA Netherlands
AU: Krol, M
EM: krol@phys.uu.nl
AF: Institute for Marine and Atmospheric Research Utrecht (IMAU), PO box 80000, Utrecht, 3508 TA Netherlands
AU: Miller, J B
EM: John.B.Miller@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway R/CMDL1, Boulder, CO 80305-3328 United States
AU: Röckmann, T
EM: t.roeckmann@phys.uu.nl
AF: Institute for Marine and Atmospheric Research Utrecht (IMAU), PO box 80000, Utrecht, 3508 TA Netherlands
AU: Warneke, T
EM: warneke@iup.physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics, PO Box 330440, Bremen, D-28334 Germany
AU: van Weele, M
EM: weelevm@knmi.nl
AF: Royal Netherlands Meteorological Institute (KNMI), PO Box 201, De Bilt, 3730 AE Netherlands
AB: Recently, precise retrievals of atmospheric methane (CH₄) from the space-borne spectrometer SCIAMACHY on board ENVISAT have been reported (Frankenberg et al., 2005). We have made comparisons between these observations and simulations with the chemistry--transport model TM4. A good agreement is found regarding most large-scale features in the CH₄ distribution, but concentrations in tropical Africa and America appear to be underestimated by the model, particularly in the dry season (August through November). We present a method to derive CH₄ emissions from satellite observations based on four-dimensional variational assimilation, and demonstrate its feasibility using synthetic experiments. The method is applied to the SCIAMACHY data, giving a quantitative estimate of the additional CH₄ emissions needed to explain the discrepancy in the tropics. Possible candidates for the additional source are discussed, and comparisons with (limited) available independent measurements are presented. Frankenberg, C., J.F. Meirink, M. van Weele, U. Platt, and T. Wagner, Assessing Methane Emissions from Global Space-Borne Observations, Science, 308, 1010-1014, 2005.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0322 Constituent sources and sinks
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005