Summary of the Final Report of Research Results1) Title of the proposed research
Validation of TANSO CH4 columns and profiles by ground-based solar absorption FTIR
2) Principal Investigator (PI) and Co-Investigators (Co-Is)
PI:
Dr. Thomas Blumenstock
Co-I:
Dr. Frank Hase
Dr. Uwe Raffalski
3) PI’s affiliation
Institute for Meteorology and Climate Research (IMK) - Karlsruhe Institute of Technology(KIT)4) Summary of the Final Report of Research Results
In the framework of the NDACC (Network for the Detection of Atmospheric Composition Change)a ground-based high resolution Fourier Transform Spectrometer (FTS) is operated at the IRF(Swedish Institute of Space Physics) in Kiruna. The instrument is a BRUKER IFS 120/125HR with aspectral resolution of 0.0025 cm-1. Solar absorption spectra are measured in the spectral region from
2 to 14 μm. Vertical profiles and column amounts of several minor constituents are derived by aconstrained least squares fitting technique. Profile information is retrieved by making use of thepressure broadening of the absorption lines. To make sure that the line shape is measured correctlyby the instrument gas cell measurements are made routinely and are analyzed with the software
LINEFIT.
Spectra were recorded on 75 days per year on average. These spectra were analysed and CH4 data
were archived on the NDACC data base. This column data was used to validate GOSAT - TANSOFTS Level 2 SWIR products of CH4. These comparisons were presented during the GOSAT RA PI
meeting in May 2011.
In addition, validation with Karlsruhe FTIR data was offered to GOSAT team. An FTIR
spectrometer is operated in Karlsruhe since September 2009. It is a TCCON certified instrument anddata are archived in the TCCON data base. The surrounding is flat and ideal for validation ofsatellite data. These data were used to validate GOSAT data and were published inDeng et al., ACP, 2014; Dils et al., AMT, 2014; Guerlet et al., JGR, 2013; Oshchepkov et al.,Applied Optics, 2013; Schepers et al., JGR, 2012; and Yoshida et al., AMT, 2013.
(See publication list below for details).
5) List of publications relating to the proposed researchDils, B., M. Buchwitz, M. Reuter, O. Schneising, H. Boesch, R. Parker, S. Guerlet, I. Aben, T.
Blumenstock, J. P. Burrows, A. Butz, N. M. Deutscher, C. Frankenberg, F. Hase, O. P. Hasekamp, J.
Heymann, M. De Mazière, J. Notholt, R. Sussmann, T. Warneke, D. Griffith, V. Sherlock, and D.
Wunch: The Greenhouse Gas Climate Change Initiative (GHG-CCI): comparative validation of
GHG-CCI SCIAMACHY/ENVISAT and TANSO-FTS/GOSAT CO2 and CH4 retrieval algorithm
products with measurements from the TCCON, Atmos. Meas. Tech., 7, 1723-1744,
doi:10.5194/amt-7-1723-2014, 2014.
Deng, F., D. B. A. Jones, D. K. Henze, N. Bousserez, K. W. Bowman,, J. B. Fisher, R. Nassar, C.
O'Dell, D. Wunch, P. O. Wennberg, E. A. Kort, S. C. Wofsy, T. Blumenstock, N. M. Deutscher, D. W.
T. Griffith, F. Hase, P. Heikkinen, V. Sherlock, K. Strong, R. Sussmann, and T. Warneke: Inferring
regional sources and sinks of atmospheric CO2 from GOSAT XCO2 data, Atmos. Chem. Phys., 14,3703–3727, doi:10.5194/acp-14-3703-2014, 2014.
S. Guerlet, A. Butz, D. Schepers, S. Basu, O. P. Hasekamp, A. Kuze, T. Yokota, J.-F. Blavier, N. M.
Deutscher, D. W. T. Griffith, F. Hase, E. Kyro, I. Morino, V. Sherlock, R. Sussmann, A. Galli and I.
Aben: Impact of aerosol and thin cirrus on retrieving and validating XCO2 from GOSAT shortwave
infrared measurements, J. Geophys. Res., Vol. 118, Issue 10, 4887–4905, DOI: 10.1002/jgrd.50332,
2013.
Y. Yoshida, N. Kikuchi, I. Morino, O. Uchino, S. Oshchepkov, A. Bril, T. Saeki, N. Schutgens, G. C.
Toon, D. Wunch, C. M. Roehl, P. O. Wennberg, D. W. T. Griffith, N. M. Deutscher, T. Warneke, J.
Notholt, J. Robinson, V. Sherlock, B. Connor, M. Rettinger, R. Sussmann, P. Ahonen, P. Heikkinen,E. Kyro, J. Mendonca, K. Strong, F. Hase, S. Dohe, and T. Yokota: Improvement of the retrieval
algorithm for GOSAT SWIR XCO2 and XCH4 and their validation using TCCON data, Atmos.
Meas. Tech., 6, 1533–1547, doi:10.5194/amt-6-1533-2013, 2013.

Oshchepkov, S., A. Bril, T. Yokota, Y. Yoshida, T. Blumenstock, N. M. Deutscher, S. Dohe, R.
Macatangay, I. Morino, J. Notholt, M. Rettinger, C. Petri, M. Schneider, R. Sussmann, O. Uchino, V.
Velazco, D. Wunch, and D. Belikov: Simultaneous retrieval of atmospheric CO2 and light pathmodification from space-based spectroscopic observations of greenhouse gases: methodology andapplication to GOSAT measurements over TCCON sites, Applied Optics, Vol. 52, Issue 6, pp.
1339-1350, http://dx.doi.org/10.1364/AO.52.001339, 2013.
Schepers, D., S. Guerlet, A. Butz, J. Landgraf, C. Frankenberg, O. Hasekamp, J.-F. Blavier,N. M.
Deutscher, D. W. T. Griffith, F. Hase, E. Kyro, I. Morino, V. Sherlock, R. Sussmann, and I. Aben:
Methane retrievals from Greenhouse Gases Observing Satellite (GOSAT) shortwave infraredmeasurements: Performance comparison of proxy and physics retrieval algorithms, J. Geophys. Res.,
VOL. 117, D10307, doi:10.1029/2012JD017549, 2012.