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Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: 2. Evaluation based on inverse model simulations

Bergamaschi, P. and Frankenberg, C. and Meirink, J. F. and Krol, M. and Dentener, F. and Wagner, T. and Platt, U. and Kaplan, J. O. and Körner, S. and Heimann, M. and Dlugokencky, E. J. and Goede, A. (2007) Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: 2. Evaluation based on inverse model simulations. Journal of Geophysical Research D, 112 (D2). Art. No. D02304. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20150508-092451496

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[img] Image (TIFF) (Figure S1a. SCIAMACHY measurements and TM5 simulations over North America (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S1b. SCIAMACHY measurements and TM5 simulations over South America (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S1c. SCIAMACHY measurements and TM5 simulations over Europe (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S1d. SCIAMACHY measurements and TM5 simulations over Africa (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S1e. SCIAMACHY measurements and TM5 simulations over Asia (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S1f. SCIAMACHY measurements and TM5 simulations over Australia (scenario S3)) - Supplemental Material
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[img] Image (TIFF) (Figure S2. Comparison of TM5 simulations with HALOE/CLAES CH4 measurements) - Supplemental Material
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[img] Image (TIFF) (Figure S3a. Bias between SCIAMACHY retrievals and TM5 model simulations) - Supplemental Material
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[img] Image (TIFF) (Figure S8. Simulated and observed CH4 mixing ratios at tropical NOAA air sampling sites for scenario S2) - Supplemental Material
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Abstract

We extend the analysis of a global CH_4 data set retrieved from SCIAMACHY (Frankenberg et al., 2006) by making a detailed comparison with inverse TM5 model simulations for 2003 that are optimized versus high accuracy CH_4 surface measurements from the NOAA ESRL network. The comparison of column averaged mixing ratios over remote continental and oceanic regions shows that major features of the atmospheric CH_4 distribution are consistent between SCIAMACHY observations and model simulations. However, the analysis suggests that SCIAMACHY CH_4 retrievals may have some bias that depends on latitude and season (up to ∼30 ppb). Large enhancements of column averaged CH_4 mixing ratios (∼50–100 ppb) are observed and modeled over India, Southeast Asia, and the tropical regions of South America, and Africa. We present a detailed comparison of observed spatial patterns and their seasonal evolution with TM5 1° × 1° zoom simulations over these regions. Application of a new wetland inventory leads to a significant improvement in the agreement between SCIAMACHY retrievals and model simulations over the Amazon basin during the first half of the year. Furthermore, we present an initial coupled inversion that simultaneously uses the surface and satellite observations and that allows the inverse system to compensate for the potential systematic bias. The results suggest significantly greater tropical emissions compared to either the a priori estimates or the inversion based on the surface measurements only. Emissions from rice paddies in India and Southeast Asia are relatively well constrained by the SCIAMACHY data and are slightly reduced by the inversion.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2006JD007268DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006JD007268/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006JD007268/suppinfoPublisherSupporting Information
ORCID:
AuthorORCID
Frankenberg, C.0000-0002-0546-5857
Krol, M.0000-0002-3506-2477
Dlugokencky, E. J.0000-0003-0612-6985
Additional Information:© 2007 American Geophysical Union. Received 7 March 2006; revised 24 May 2006; accepted 18 August 2006; published 24 January 2007. This work has been supported by the European Commission RTD projects EVERGREEN ("EnVisat for Environmental Regulation of GREENhouse gases," contract EVG1-CT-2002-00079, 5th Framework Programme) and GEMS ("Global and regional Earth-system (Atmosphere) Monitoring using Satellite and in-situ data," contract SIP4-CT-2004-516099, 6th Framework Programme). We thank Giacomo Grassi and Adrian Leip for detailed discussions on CH_4 emissions from plants. We are grateful to A. Segers for his assistance in preprocessing the ECMWF meteorological data as TM5 input.
Funders:
Funding AgencyGrant Number
European Commission RTD project EVERGREENEVG1-CT-2002-00079
European Commission RTD project GEMSSIP4-CT-2004-516099
Issue or Number:D2
Record Number:CaltechAUTHORS:20150508-092451496
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150508-092451496
Official Citation:Bergamaschi, P., et al. (2007), Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: 2. Evaluation based on inverse model simulations, J. Geophys. Res., 112, D02304, doi:10.1029/2006JD007268
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57370
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 May 2015 17:00
Last Modified:09 Mar 2020 13:18

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