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Comparison of CH_4 inversions based on 15 months of GOSAT and SCIAMACHY observations

Monteil, Guillaume and Houweling, Sander and Butz, André and Guerlet, Sandrine and Schepers, Dinand and Hasekamp, Otto and Frankenberg, Christian and Scheepmaker, Remco and Aben, Ilse and Röckmann, Thomas (2013) Comparison of CH_4 inversions based on 15 months of GOSAT and SCIAMACHY observations. Journal of Geophysical Research. Atmospheres, 118 (20). pp. 11807-11823. ISSN 2169-897X. https://resolver.caltech.edu/CaltechAUTHORS:20181127-155643398

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Abstract

Over the past decade the development of Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) retrievals has increased the interest in the use of satellite measurements for studying the global sources and sinks of methane. Meanwhile, measurements are becoming available from the more advanced Greenhouse Gases Observing Satellite (GOSAT). The aim of this study is to investigate the application of GOSAT retrievals to inverse modeling, for which we make use of the TM5‐4DVAR inverse modeling framework. Inverse modeling calculations are performed using data from two different retrieval approaches: a full physics and a lightpath proxy ratio method. The performance of these inversions is analyzed in comparison with inversions using SCIAMACHY retrievals and measurements from the National Oceanic and Atmospheric Administration‐Earth System Research Laboratory flask‐sampling network. In addition, we compare the inversion results against independent surface, aircraft, and total‐column measurements. Inversions with GOSAT data show good agreement with surface measurements, whereas for SCIAMACHY a similar performance can only be achieved after significant bias corrections. Some inconsistencies between surface and total‐column methane remain in the Southern Hemisphere. However, comparisons with measurements from the Total Column Carbon Observing Network in situ Fourier transform spectrometer network indicate that those may be caused by systematic model errors rather than by shortcomings in the GOSAT retrievals. The global patterns of methane emissions derived from SCIAMACHY (with bias correction) and GOSAT retrievals are in remarkable agreement and allow an increased resolution of tropical emissions. The satellite inversions increase tropical methane emission by 30 to 60 TgCH_4/yr compared to initial a priori estimates, partly counterbalanced by reductions in emissions at midlatitudes to high latitudes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/2013jd019760DOIArticle
ORCID:
AuthorORCID
Frankenberg, Christian0000-0002-0546-5857
Alternate Title:Comparison of CH4 inversions based on 15 months of GOSAT and SCIAMACHY observations
Additional Information:© 2013. American Geophysical Union. Received 7 March 2013; revised 27 September 2013; accepted 1 October 2013; published 17 October 2013. This project was funded by the Dutch NWO under grant 865.07.007. Funding from ESA's Climate Change Initiative on GHGs (Sandrine Guerlet) and the European Commission's 7th framework program under grant agreement 218793 (Sandrine Guerlet and Remco Scheepmaker) is acknowledged. Dinand Schepers is supported by the gebruikersondersteuning ruimteonderzoek program of NWO through project ALW‐GO‐AO/21. André Butz has been supported by Deutsche Forschungsgemeinschaft (DFG) through the Emmy‐Noether Programme (grant BU2599/1‐1, RemoteC). We thank SURFsara (www.surfsara.nl) for the support in using the Dutch national super computer Huygens. We thank the data providers: Access to the GOSAT data was granted through the 2nd GOSAT research announcement jointly issued by JAVA, NIES, and MOE; surface observations from the NOAA/CMDL network were obtained from the website http://www.esrl.noaa.gov/gmd/dv/iadv; TCCON data were obtained from the TTCON DATA Archive, operated by the California Institute of Technology (http://tccon.ipac.caltech.edu); we thank Steven Wofsy (Harvard University) for providing the HIPPO data used in the paper and for his useful suggestions.
Funders:
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)865.07.007
European Space Agency (ESA)UNSPECIFIED
European Research Council (ERC)218793
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)ALW‐GO‐AO/21
Deutsche Forschungsgemeinschaft (DFG)BU2599/1-1
Subject Keywords:methane; GOSAT; SCIAMACHY; inverse modelling
Issue or Number:20
Record Number:CaltechAUTHORS:20181127-155643398
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181127-155643398
Official Citation:Monteil, G., S. Houweling, A. Butz, S. Guerlet, D. Schepers, O. Hasekamp, C. Frankenberg, R. Scheepmaker, I. Aben, and T. Röckmann (2013), Comparison of CH4 inversions based on 15months of GOSAT and SCIAMACHY observations, J. Geophys. Res. Atmos., 118, 11,807–11,823, doi: 10.1002/2013JD019760.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91252
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Nov 2018 16:19
Last Modified:03 Oct 2019 20:33

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