A41I-0165
GOSAT TIR radiometric validation toward simultaneous GHG column and profile observation

Thursday, 17 December 2015
Poster Hall (Moscone South)
Fumie Kataoka, RESTEC, Tsukuba, Japan, Robert O Knuteson, University of Wisconsin Madison, Madison, WI, United States, Akihiko Kuze, JAXA Japan Aerospace Exploration Agency, EORC, Sagamihara, Japan, Kei Shiomi, Japan Aerospace Exploration Agency, Kanagawa, Japan, Hiroshi Suto, JAXA Japan Aerospace Exploration Agency, Sagamihara, Japan and Naoko Saitoh, Chiba University, Chiba, Japan
Abstract:
 The Greenhouse gases Observing SATellite (GOSAT) was launched on January 2009 and continues its operation for more than six years. The thermal and near infrared sensor for carbon observation Fourier-Transform Spectrometer (TANSO-FTS) onboard GOSAT measures greenhouse gases (GHG), such as CO2 and CH4, with wide and high resolution spectra from shortwave infrared (SWIR) to thermal infrared (TIR). This instrument has the advantage of being able to measure simultaneously the same field of view in different spectral ranges. The combination of column-GHG form SWIR band and vertical profile-GHG from TIR band provide better understanding and distribution of GHG, especially in troposphere.
 This work describes the radiometric validation and sensitivity analysis of TANSO-FTS TIR spectra, especially CO2, atmospheric window and CH4 channels with forward calculation.
 In this evaluation, we used accurate in-situ dataset of the HIPPO (HIAPER Pole-to-Pole Observation) airplane observation data and GOSAT vicarious calibration and validation campaign data in Railroad Valley, NV.
The HIPPO aircraft campaign had taken accurate atmospheric vertical profile dataset (T, RH, O3, CO2, CH4, N2O, CO) approximately pole-to-pole from the surface to the tropopause over the ocean. We implemented these dataset for forward calculation and made the spectral correction model with respect to wavenumber and internal calibration blackbody temperature
 The GOSAT vicarious calibration campaign have conducted every year since 2009 near summer solstice in Railroad Valley, where high-temperature desert site. In this campaign, we have measured temperature and humidity by a radiosonde and CO2, CH4 and O3 profile by the AJAX airplane at the time of the GOSAT overpass. Sometimes, the GHG profiles over the Railroad Valley show the air mass advection in mid-troposphere depending on upper wind. These advections bring the different concentration of GHG in lower and upper troposphere. Using these cases, we made sensitivity analysis of TANSO-FTS TIR band in troposphere changing in-situ GHG profiles.

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