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 in orbit

• Verfasst von: Suto, Hiroshi [VerfasserIn]
• Verfasst von: Kataoka, Fumie [VerfasserIn]
• Verfasst von: Kikuchi, Nobuhiro [VerfasserIn]
• Verfasst von: Knuteson, Robert O. [VerfasserIn]
• Verfasst von: Butz, André [VerfasserIn]
• Verfasst von: Haun, Markus [VerfasserIn]
• Verfasst von: Buijs, Henry [VerfasserIn]
• Verfasst von: Shiomi, Kei [VerfasserIn]
• Verfasst von: Imai, Hiroko [VerfasserIn]
• Verfasst von: Kuze, Akihiko [VerfasserIn]
• Titel: 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 in orbit
• Verf.angabe: Hiroshi Suto, Fumie Kataoka, Nobuhiro Kikuchi, Robert O. Knuteson, Andre Butz, Markus Haun, Henry Buijs, Kei Shiomi, Hiroko Imai, and Akihiko Kuze
• E-Jahr: 2021
• Jahr: 12 March 2021
• Umfang: 27 S.
• Teil: volume:14
• Teil: year:2021
• Teil: number:3
• Teil: pages:2013-2039
• Teil: extent:27
• Fussnoten: Gesehen am 28.04.2021
• Titel Quelle: Enthalten in: Atmospheric measurement techniques
• Ort Quelle: Katlenburg-Lindau : Copernicus, 2008
• Jahr Quelle: 2021
• Band/Heft Quelle: 14(2021), 3, Seite 2013-2039
• ISSN Quelle: 1867-8548
• DOI: doi:10.5194/amt-14-2013-2021
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1755991118

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 Spectrometer-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 <span class="inline-formula">µ</span>m), weak and strong CO<span class="inline-formula">₂</span> bands (1.6 and 2.0 <span class="inline-formula">µ</span>m), weak and strong CH<span class="inline-formula">₄</span> bands (1.6 and 2.3 <span class="inline-formula">µ</span>m), a weak CO band (2.3 <span class="inline-formula">µ</span>m), a mid-wave TIR band (5.5-8.4 <span class="inline-formula">µ</span>m), and a long-wave TIR band (8.4-14.3 <span class="inline-formula">µ</span>m) with 0.2 cm<span class="inline-formula">⁻¹</span> spectral sampling intervals. TANSO-FTS-2 is equipped with a solar diffuser target, a monochromatic light source, and a blackbody 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 in-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 1 K in the range from 220 to 320 K. GOSAT-2 not only provides seamless global CO<span class="inline-formula">₂</span> and CH<span class="inline-formula">₄</span> 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.</p>