• Login
     
    View Item 
    •   ORFEO Home
    • Royal Belgian Institute for Space Aeronomy
    • BIRA-IASB publications
    • View Item
    •   ORFEO Home
    • Royal Belgian Institute for Space Aeronomy
    • BIRA-IASB publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Comparison of the GOSAT TANSO-FTS TIR CH4 volume mixing ratio vertical profiles with those measured by ACE-FTS, ESA MIPAS, IMK-IAA MIPAS, and 16 NDACC stations

    Thumbnail
    View/Open
    Olsen(2017a).pdf (3.075Mb)
    Authors
    Olsen, K.S.
    Strong, K.
    Walker, K.A.
    Boone, C.D.
    Raspollini, P.
    Plieninger, J.
    Bader, W.
    Conway, S.
    Grutter, M.
    Hannigan, J.W.
    Hase, F.
    Jones, N.
    De Mazière, M.
    Notholt, J.
    Schneider, M.
    Smale, D.
    Sussmann, R.
    Saitoh, N.
    Show allShow less
    Discipline
    Physical sciences
    Subject
    atmospheric chemistry
    carbon dioxide
    Envisat
    Fourier transform
    GOSAT
    infrared imagery
    instrumentation
    methane
    MIPAS
    mixing ratio
    observatory
    resolution
    sensor
    smoothing
    software
    spectrometer
    troposphere
    vertical profile
    Arctic
    Canada
    Ellesmere Island
    Eureka
    Nunavut
    Queen Elizabeth Islands
    Audience
    Scientific
    Date
    2017
    Metadata
    Show full item record
    Description
    The primary instrument on the Greenhouse gases Observing SATellite (GOSAT) is the Thermal And Near infrared Sensor for carbon Observations (TANSO) Fourier transform spectrometer (FTS). TANSO-FTS uses three short-wave infrared (SWIR) bands to retrieve total columns of CO2 and CH4 along its optical line of sight and one thermal infrared (TIR) channel to retrieve vertical profiles of CO2 and CH4 volume mixing ratios (VMRs) in the troposphere. We examine version 1 of the TANSO-FTS TIR CH4 product by comparing co-located CH4 VMR vertical profiles from two other remote-sensing FTS systems: the Canadian Space Agency's Atmospheric Chemistry Experiment FTS (ACE-FTS) on SCISAT (version 3.5) and the European Space Agency's Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat (ESA ML2PP version 6 and IMK-IAA reduced-resolution version V5R-CH4-224/225), as well as 16 ground stations with the Network for the Detection of Atmospheric Composition Change (NDACC). This work follows an initial inter-comparison study over the Arctic, which incorporated a ground-based FTS at the Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Canada, and focuses on tropospheric and lower-stratospheric measurements made at middle and tropical latitudes between 2009 and 2013 (mid-2012 for MIPAS). For comparison, vertical profiles from all instruments are interpolated onto a common pressure grid, and smoothing is applied to ACE-FTS, MIPAS, and NDACC vertical profiles. Smoothing is needed to account for differences between the vertical resolution of each instrument and differences in the dependence on a priori profiles. The smoothing operators use the TANSO-FTS a priori and averaging kernels in all cases. We present zonally averaged mean CH4 differences between each instrument and TANSO-FTS with and without smoothing, and we examine their information content, their sensitive altitude range, their correlation, their a priori dependence, and the variability within each data set. Partial columns are calculated from the VMR vertical profiles, and their correlations are examined. We find that the TANSO-FTS vertical profiles agree with the ACE-FTS and both MIPAS retrievals' vertical profiles within 4% (± ∼40ppbv) below 15km when smoothing is applied to the profiles from instruments with finer vertical resolution but that the relative differences can increase to on the order of 25% when no smoothing is applied. Computed partial columns are tightly correlated for each pair of data sets. We investigate whether the difference between TANSO-FTS and other CH4 VMR data products varies with latitude. Our study reveals a small dependence of around 0.1% per 10 degrees latitude, with smaller differences over the tropics and greater differences towards the poles.
    Citation
    Olsen, K.S.; Strong, K.; Walker, K.A.; Boone, C.D.; Raspollini, P.; Plieninger, J.; Bader, W.; Conway, S.; Grutter, M.; Hannigan, J.W.; Hase, F.; Jones, N.; De Mazière, M.; Notholt, J.; Schneider, M.; Smale, D.; Sussmann, R.; Saitoh, N. (2017). Comparison of the GOSAT TANSO-FTS TIR CH4 volume mixing ratio vertical profiles with those measured by ACE-FTS, ESA MIPAS, IMK-IAA MIPAS, and 16 NDACC stations. , Atmospheric Measurement Techniques, Vol. 10, Issue 10, 3697-3718, DOI: 10.5194/amt-10-3697-2017.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/6320
    doi: http://dx.doi.org/10.5194/amt-10-3697-2017
    scopus: 2-s2.0-85032857496
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

    Browse

    All of ORFEOCommunities & CollectionsBy Issue DateAuthorsTitlesDisciplinesThis CollectionBy Issue DateAuthorsTitlesDisciplines
     

    DSpace software copyright © 2002-2016  DuraSpace
    Send Feedback | Cookie Information
    Theme by 
    Atmire NV