Atmospheric carbon dioxide and methane from SCIAMACHY/ENVISAT
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1 GEMS Final Assembly 2009, FZ Jülich, Atmospheric carbon dioxide and methane from SCIAMACHY/ENVISAT Michael Buchwitz, O. Schneising, M. Reuter, H. Bovensmann, J. P. Burrows Institute of Environmental Physics (IUP) University of Bremen FB1, Bremen, Germany
2 SCIAMACHY on ENVISAT SCIAMACHY - Scanning Imaging Absorption Spectrometer for Atmospheric CHartographY Orbit sequence: Nadir, limb,... Spectral coverage: nm O2 Horizontal resolution: ~ 30 x 60 km2 CO2 & CH4
3 SCIAMACHY & GreenHouse Gases (GHG) WFM-DOAS example fits Schneising, PhD thesis, 2008 Buchwitz et al., 2005 Retrievals based on reflected solar radiation are very sensitive to the lower troposphere where the source/sink signal is largest Therefore significant GHG surface flux uncertainty reduction potential Houweling et al., 2004
4 SCIAMACHY GHG data products & GEMS Two scientific products provided by external satellite data provider: WFM-DOAS IMAP-DOAS - Univ. Bremen - - SRON / Univ. Heidelberg - Carbon dioxide & methane Methane Funding: Frankenberg et al., Science, 2005 GEMS GHG
5 SCIAMACHY CO2: Seasonal cycle and annual increase Annual increase of ~2ppm/yr in good agreement with CarbonTracker Retrieved amplitude of seasonal cycle over NH significantly larger: Underestimated by model? Overestimated by SCIA? Buchwitz et al., ACP, 2007; Schneising et al., ACP, 2008
6 SCIAMACHY CO2: Regional pattern Clear correlations Retrieved pattern more variable Schneising et al., ACP, 2008 Under investigation
7 SCIAMACHY CO2: Anthropogenic source regions SCIAMACHY CO2 Population Emissions Retrieved CO2 elevated near anthropogenic source regions One-to-one correlation with population density and assumed emissions not expected e.g. due to long lifetime of CO2 Schneising et al., ACP, 2008
8 SCIAMACHY CO2 & GEMS SCIAMACHY WFMDv1.0 CO2 (Univ. Bremen retrievals) has been delivered to GEMS via DLR led ESA GSE project PROMOTE Initial model ECMWF Significant differences have been identified which require further investigations related to possible biases of the SCIAMACHY CO2 retrievals model issues SCIAMACHY CO2 not yet assimilated into the IFS
9 SCIAMACHY methane Landfills Coal mining Wetlands Rice Ruminants Wastewater Energy Natural gas WFMDv1.0 Termites Schneising et al., ACP, 2008 Hydrates
10 SCIA CH4: Time evolution of data quality Comparison of different versions of SCIAMACHY year 2003 methane with ground-based FTS: R (SCIA, FTS) SCIA-FTS % IMAPv4.9 WFMDv1.0 WFMDv1.0 IMAPv4.9 Dils et al., IGAC conference (poster), 2008 Significant improvements of the SCIAMACHY retrievals from one version to the next (further improvements expected)
11 SCIA CH4: WFMDv1.0 vs JRC s TM5 model over China & India SCIA TM5 Schneising et al., ACP, 2009 Good overall agreement between the two independent data sets. Interpretation of SCIA-TM5 differences in terms of methane emissions: See presentation of P. Bergamaschi, JRC
12 SCIA CH4: Assimilation in GEMS (I) Reanalysis I: First ever assimilation of methane retrieved from satellite NIR/nadir observations into a global model! Data: SCIAMACHY WFMDv1.0 methane
13 SCIA CH4: Assimilation in GEMS (II) new methane Frankenberg et al., GRL, 2008 new old methane SCIAMACHY methane & GEMS: Reanalysis II using latest version of IMAPDOAS based on updated spectroscopic input data
14 SCIA CH4: Assimilation in GEMS (III) Reanalysis I: WFMDv1.0 Reanalysis II: IMAPv4.9
15 Future activities related to SCIAMACHY GHG Processing & analysis of more data Latest result from ongoing (re)processing... Prelim. conclusion: CO2 very stable also after 2005! Retrieval algorithm improvements Use of data products for various applications e.g. within FP7 MACC
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