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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-360
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-360
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Sep 2020

28 Sep 2020

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This preprint is currently under review for the journal AMT.

Thermal and near-infrared sensor for carbon observation Fourier-transform spectrometer-2 (TANSO-FTS-2) on the Greenhouse Gases Observing Satellite-2 (GOSAT-2) during its first year on orbit

Hiroshi Suto1, Fumie Kataoka2, Nobuhiro Kikuchi1, Robert O Knuteson3, Andre Butz4, Markus Haun4, Henry Buijs5, Kei Shiomi1, Hiroko Imai1, and Akihiko Kuze1 Hiroshi Suto et al.
  • 1Japan Aerospace Exploration Agency, Tsukuba-city, Ibaraki, 305-8505, Japan
  • 2Remote Sensing Technology Center of Japan, Tsukuba-city, Ibaraki, 305-8505, Japan
  • 3University of Wisconsin-Madison, Madison, WI, 53706, USA
  • 4Institut für Umweltphysik, Universität Heidelberg, 69120 Heidelberg, Germany
  • 5FTS Consulting, Quebec, G3E 1H7, Canada

Abstract. The Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2), in orbit since 29 October 2018, follows up the GOSAT mission, itself in orbit since 23 January 2009. GOSAT-2 monitors carbon dioxide and methane in order to increase our understanding of the global carbon cycle. It simultaneously measures carbon monoxide emitted from fossil fuel combustion and biomass burning, and permits identification of the amount of combustion-related carbon. To do this, the satellite utilizes the Thermal and Near Infrared Sensor for Carbon Observation Fourier-Transform Spectomer-2 (TANSO-FTS-2). This spectrometer detects gas absorption spectra of solar radiation reflected from the Earth’s surface in the shortwave-infrared (SWIR) region as well as the emitted thermal infrared radiation (TIR) from the ground and the atmosphere. TANSO-FTS-2 can measure the oxygen A band (0.76 um), weak and strong CO2 bands (1.6 um and 2.0 um), weak and strong CH4 bands (1.6 um and 2.3 um), a weak CO band (2.3 um), a mid-wave TIR band (5.5–8.4 um) and a long-wave TIR band (8.4–14.3 um) with 0.2 cm−1 spectral resolution. TANSO-FTS-2 is equipped with a solar diffuser target, a monochromatic light source, and a black body for spectral radiance calibration. These calibration sources permit characterization of time-dependent instrument changes in orbit. The onboard-recalibrated instrumental parameters are considered in operational level-1 processing and released as TANSO-FTS-2 level-1 version 102102 products, which were officially released on 25 May 2020. This paper provides an overview of the TANSO-FTS-2 instrument, the level-1 processing, and the first-year on-orbit performance. To validate the spectral radiance calibration during the first year of operation, the spectral radiance of the version 102102 product is compared at temporally coincident and spatially collocated points from February 2019 to March 2020 with TANSO-FTS on GOSAT for SWIR, and with AIRS on AQUA and IASI on METOP-B for TIR. The spectral radiances measured by TANSO-FTS and TANSO-FTS-2 agree within 2 % of the averaged bias and 0.5 % standard deviation for SWIR bands. The agreement of brightness temperature between TANSO-FTS-2 and AIRS, IASI, is better than 0.5 % in the range from 220 K to 320 K. GOSAT-2 not only provides seamless global CO2 and CH4 observation but also observes local emissions and uptake with an additional CO channel, fully customized sampling patterns, higher signal-to-noise ratios, and wider pointing angles than GOSAT.

Hiroshi Suto et al.

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Short summary
The Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2), in orbit since October 2018, is the follow-up mission of GOSAT, which has been operating since January 2009. Both satellites are dedicated to the monitoring of global carbon dioxide and methane to further knowledge of the global carbon cycle. This paper has reported on the function and performance of the TANSO-FTS-2 instrument, level-1 data processing, and calibrations for the first year of GOSAT-2 observation.
The Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2), in orbit since October 2018, is...
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