Initial Analysis Results of Focus-mode Observation Data from the Total Anthropogenic and Natural Emissions Mapping SpectrOmeter-3 (TANSO-3) Onboard the Global Observing SATellite for Greenhouse Gases and Water Cycle (GOSAT-GW, “IBUKI GW”)

<Simultaneous announcement with the National Institute for Environmental Studies (NIES)>
1. The Ministry of the Environment (MOE) of Japan, in cooperation with the National Institute for Environmental Studies (NIES) and the Japan Aerospace Exploration Agency (JAXA), successfully launched the Global Observing SATellite for Greenhouse gases and Water cycle  “IBUKI-GW” (GOSAT-GW)^*1 on June 29, 2025 (JST).

*1 “IBUKI-GW” (GOSAT-GW: Global Observing SATellite for Greenhouse gases and Water cycle)
　A satellite that observes Earth’s greenhouse gases and water cycle from space. It carries two mission instruments: the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) and the Advanced Microwave Scanning Radiometer 3 (AMSR3).

2. NIES has recently completed an initial analysis of focus-mode observation data acquired by the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) onboard GOSAT-GW and has derived concentration distributions of carbon dioxide, methane, and nitrogen dioxide over a metropolitan area.

3. Going forward, Level 1B products^*2 are planned to be released Level 1B products^*2 in spring 2026, followed by Level 2 products^*3 in spring 2027 for public access, with sufficient quality after calibration and validation. *2 Level 1B products: Radiance spectral data observed by TANSO-3
*3 Level 2 products: Data including column-averaged concentrations of CO₂ and CH₄ and slant column amounts of NO₂ derived from Level 1B products