Validation of recent versions for the GOSAT and GOSAT-2 FTS SWIR L2 products
Isamu Morino, National Institute for Environmental Studies (NIES), morino@nies.go.jp (Presenter)
Yukitomo Tsutsumi, National Institute for Environmental Studies (NIES), tsutsumi.yukitomo@nies.go.jp
Osamu Uchino, National Institute for Environmental Studies (NIES), uchino.osamu@nies.go.jp
Tran Thi Ngoc Trieu, National Institute for Environmental Studies (NIES), thi.tran@nies.go.jp
Matthias M. Frey, National Institute for Environmental Studies (NIES), frey.matthias.max@nies.go.jp
Yukio Yoshida, National Institute for Environmental Studies (NIES), yoshida.yukio@nies.go.jp
Tsuneo Matsunaga, National Institute for Environmental Studies (NIES), matsunag@nies.go.jp
Akihide Kamei, National Institute for Environmental Studies (NIES), kamei.akihide@nies.go.jp
Makoto Saito, National Institute for Environmental Studies (NIES), saito.makoto@nies.go.jp
Hibiki M. Noda, National Institute for Environmental Studies (NIES), noda.hibiki@nies.go.jp
The Greenhouse gases Observing SATellite (GOSAT), launched on 23 Jan 2009, is the world's first satellite dedicated to measuring concentrations of the two major anthropogenic greenhouse gases, carbon dioxide (CO2) and methane (CH4), from space. Column-averaged dry air mole fractions of CO2, CH4, and water vapor (H2O) (denoted as XCO2, XCH4 and XH2O) are retrieved from the Short-Wavelength InfraRed (SWIR) spectral data observed with the Thermal And Near-infrared Sensor for carbon Observation - Fourier Transform Spectrometer (TANSO-FTS) onboard GOSAT. The present NIES full physics SWIR retrieval algorithm (V02.90) for land high-gain soundings showed small biases and standard deviations, by comparing with data of the Total Carbon Column Observing Network (TCCON) (version GGG2014): -0.35 ppm and 2.19 ppm for XCO2, -2.2 ppb and 13.4 ppb for XCH4, and -0.8% and 32.3% for XH2O, respectively. We are continuing the validation analysis for V02.90/02.91 using the TCCON data. The GOSAT TANSO-FTS SWIR L2 products are already being used for scientific research applications for 12 years.
GOSAT-2, a successor of GOSAT, was launched on 29 Oct 2018, and is now in operation. In addition to XCO2, XCH4, and XH2O, XCO (column-averaged dry air mole fraction of carbon monoxide) is retrieved from GOSAT-2 TANSO-FTS-2 SWIR spectra. The GOSAT-2 FTS-2 SWIR L2 products retrieved by the full physics and proxy algorithms have been released to the public in Nov 2020. Full physics XCO2 and XCH4 (V01.04) have larger biases and standard deviations than GOSAT, but the validation result for proxy XCH4 (V01.03) is similar to GOSAT. We are also continuing the validation analysis for full physics V01.04 and proxy V01.03 using the TCCON data.
In this presentation, we show updates on the validation analysis for the GOSAT and GOSAT-2 FTS SWIR L2 products using the TCCON data, as well as related validation activities.
Poster: Poster_Morino__57_25.pdf
Presentation Type: Poster
Session: 2.5c Uncertainty quantification and bias correction techniques
Session Date: Tuesday (6/15) 12:00 PM