講演情報
[U16-01]気候変動対策における地球観測衛星の役割：GOSAT-GWミッションで得られる新データ★招待講演
*谷本 浩志1、松永 恒雄1、染谷 有1、藤縄 環1、大山 博史1、森野 勇1、八代 尚1、杉田 考史1、佐伯 田鶴1、吉田 幸生1、ミュラー アストリッド1、猪俣 敏1、林 顯光1、グエン チー1、山下 陽介1、岡本 祥子1、池田 恒平1、マヘンダー ラジュワール1、チアフア シュウ1、金谷 有剛2、関谷 高志2、Patra Prabir2、滝川 雅之2、木名瀬 健2、笠井 康子3、佐藤 知紘3 (1.国立環境研究所、2.海洋研究開発機構、3.情報通信研究機構)
キーワード：
温室効果ガス、気候変動対策、地球観測衛星、GOSAT-GW
The Japanese Global Observing SATellite for Greenhouse gases and Water cycle (GOSAT-GW) is an Earth-observing satellite to conduct global observations of atmospheric carbon dioxide (CO2), methane (CH4), and nitrogen dioxide (NO2) simultaneously from a single platform. GOSAT-GW is the third satellite in the series of the currently operating Greenhouse gases Observing SATellite (GOSAT) and GOSAT-2. One of its two sensors, the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) is a high-resolution grating spectrometer designed to measure the column-averaged dry-air mole fractions of CO2 and CH4(denoted as XCO2 and XCH4, respectively), as well as the vertical column density of tropospheric NO2, by utilizing the wavelength bands of 0.45, 0.76, and 1.61 µm for NO2, O2, and CO2 and CH4, retrievals, respectively. GOSAT-GW flies in a sun-synchronous orbit with a local overpass time of approximately 13:30 and a 3-day ground-track repeat cycle. The TANSO-3 sensor has two observation modes in the push-broom operation: Wide Mode, which provides globally covered maps with a 10-km spatial resolution within 3 days, and Focus Mode, which provides snapshot maps over targeted areas with a high spatial resolution of 1–3 km. The objectives of the GOSAT-GW mission include (1) monitoring atmospheric global-mean concentrations of greenhouse gasses (GHGs), (2) verifying national anthropogenic GHG emissions inventories, and (3) detecting GHG emissions from large sources, such as megacities and power plants. With a projected operational lifetime of seven years, GOSAT-GW will provide vital space-based constraints on both anthropogenic and natural GHG emissions. The results of the first-light measurements will be presented, possibly in comparison to other satellites and the TCCON and COCCON observations.