Summary of the Final Report of Research Results1) Title of the proposed research
Development of methods and software for retrieval of CO2 and CH4 spatial distributions fromTANSO-FTSand TANSO-CAI sensors data and application of these methods for atmosphere over Western Siberia
2) Principal Investigator (PI) and Co-Investigators (Co-Is)
PI:
Dr. Konstantin G. Gribanov
Co-I:
Dr. Vyacheslav I. Zakharov
3) PI’s affiliation
Ural Federal University4) Summary of the Final Report of Research Results
To acquire GOSAT spectra measured in thermal infrared for retrieval of methane and water isotopologue HDO
distributions in the atmosphere of Western Siberia we modified FIRE-ARMS (Fine Infrared Explorer for
Atmospheric Radiation MeasurementS) software package for massive processing of GOSAT Level 1B standardproducts. We developed separate codes and modules for the following tasks:•single thermal infrared spectrum extraction from HDF5 file of GOSAT Level 1B standard product;•atmospheric temperature, humidity, surface pressure extraction from NCEP/NCAR reanalysis data (inNetCDF format) for given time and coordinates;•creation of input files for FIRE-ARMS main code;•selection of spectra from HDF5 directory corresponding to given conditions (coordinate range, timerange, cloudiness, quality flags,...);•scripting for total retrieval job;

•Levenberg-Maquardt solution as suggested in the paper Changfeng Ma, and Lihua Jiang, Some
research on Levenberg-Marquardt method for nonlinear equations. Applied Mathematics andComputation, 184 (2007) 1032-1040, doi:10.1016/j.amc.2006.07.004.

Fig.1. Western Siberia area, red and green stars are existing observation sites at Kourovka
and Labytnangi respectively, white star is planned observation site at Igarka, and red circle
is Yekaterinburg city.

Fig.2. GOSAT cloudless spots closest to Kourovka (red star) for which observation time
was synchronous with FTIR ground based observations in Kourovka.
We undertook an attempt to retrieve columnar values of δHDO for atmospheric water vapor from thermal
infrared measurements of TANSO-FTS for whole area of Western Siberia (see Fig.1) and for smaller area insurroundings of our observation site at Kourovka (57.048N, 59.545W). We had an intention to compare directmeasurements at surface and retrievals from GOSAT spectra. However, our efforts were not successful. We
noticed that some spectra have too strong HDO signal (near 1204 cm-1) for cold northern observation points
with relatively small H2O signal. Our retrieval procedure gave close to zero or even positive values for δHDO inthese cases which were considered as implausible. Also we tried to compare retrievals with ECHAM5-wiso
output for whole area of Western Siberia, we did not find good correlation. We obtained some weak result (only7 cloudless observations in the vicinity of Kourovka and at given time, see Fig.2) and tried to represent them inpublication (2 in the list below), this part was removed due to reasonable criticism from referees. So, final
publication (3 in the list below) does not contain mentioning of retrieval from GOSAT spectra. The problem
was understood better after 5th GOSAT PI Meeting (May 27, 2013, Yokohama, Japan) where J.Gero et al.
presented their report “GOSAT TIR Band Inter-calibration with Satellite Infrared Sensors” and showed thatradiometric calibration of TASNO-FTS in thermal infrared band was not perfect for given period of time. So,
since this moment we decided to postpone using of TIR GOSAT measurements and to focus our efforts on
using ready SWIR Level 2 products (as in 1 in the publication list) and development of code applicable for theacquisition of SWIR band of GOSAT measurements. To continue our research on water isotopologues in theatmosphere of Western Siberia we had to develop the same package for massive processing of IASI/METOP
data. Our current activity (related to GOSAT project) is focused on the following directions:•continuing development of methods for ground based FTIR measurements for methane and water
isotopologues using constraints obtained from our direct measurements from our observation sites(using Picarro L2130-i and G2401 instruments);•

inclusion of VLIDORT software package into our FIRE-ARMS code to become able to retrieve
required constituents from satellite measured spectra of near infrared band (including SWIR band ofGOSAT);•installation of new observation site for water isotopologues in Igarka (eastern boundary of Western
Siberia, 67.467N, 86.567E)

5) List of publications relating to the proposed research
1. Rokotyan, N.V., Imasu, R., Zakharov, V.I., Gribanov, K.G., Khamatnurova, M.Yu. Seasonal cycle
amplitude of CO2 for the atmosphere of Ural region as measured by ground-based and satellite remotesensing. Atmospheric and Oceanic Optics, in press (in Russian).
2. K. Gribanov, J. Jouzel, V. Bastrikov, J.-L. Bonne, F.-M. Breon, M. Butzin, O. Cattani, V. MassonDelmotte, N. Rokotyan, M. Werner, and V. Zakharov. ECHAM5-wiso water vapour isotopologues
simulation and its comparison with WS-CRDS measurements and retrievals from GOSAT and groundbased FTIR spectra in the atmosphere of Western Siberia. Atmos. Chem. Phys. Discuss., 13, 25992640, 2013.
3. K. Gribanov, J. Jouzel, V. Bastrikov, J.-L. Bonne, F.-M. Breon, M. Butzin, O. Cattani, V. MassonDelmotte, N. Rokotyan, M. Werner, and V. Zakharov. Developing a western Siberia reference site fortropospheric water vapour isotopologue observations obtained by different techniques (in situ andremote sensing), Atmos. Chem. Phys., 14, 5943-5957, doi:10.5194/acp-14-5943-2014, 2014.
4. Pommier, M., Lacour, J.-L., Risi, C., Bréon, F. M., Clerbaux, C., Coheur, P.-F., Gribanov, K.,
Hurtmans, D., Jouzel, J., and Zakharov, V.: Observation of tropospheric δD by IASI over western
Siberia: comparison with a general circulation model, Atmos. Meas. Tech., 7, 1581-1595,
doi:10.5194/amt-7-1581-2014, 2014.
5. Rokotyan N.V., Gribanov K.G., Zakharov V.I. Effect of temperature-independent absorption and itsuse in remote sensing of atmospheric carbon gases. // Atmospheric and oceanic optics. 2011. V. 24. No.
06. P. 510-515 [in Russian].
6. Gribanov K.G., Imasu R., Zakharov V.I. Neural networks for CO2 profile retrieval from data ofGOSAT/TANSO-FTS. // Atmospheric and oceanic optics. 2009. V. 22. No. 09. P. 890-895 [in Russian].

7. K. Gribanov, N. Rokotyan, V. Bastrikov, V. Zakharov. Series of measurements from new possible
validation site at Kourovka. Abstract Collection, The 9th International Workshop on Greenhouse GasMeasurements from Space (IWGGMS-9), May 29th — 31st, 2013, Yokohama Symposia, Japan, p.51.
8. N. Rokotyan, R. Imasu, M. Khamatnurova, V. Zakharov, K. Gribanov and C. Petri: Ground-based
remote sensing of XCO2 and XCH4 in the atmosphere of Ural and comparison with GOSAT L2retrievals, IRWG/TCCON Meeting, Bad Sulza, Germany, 2014