GOSAT-GW温室効果ガス観測ミッション：コンセプト

抄録

With the TANSO-3 sensor onboard, the Global Observing SATellite for Greenhouse gases and Water cycle (GOSAT-GW) greenhouse gas (GHG) observing mission will make the first global, space-based observations of the column-averaged carbon dioxide (CO₂) and methane (CH₄) dry air mole fraction (XCO₂ and XCH₄, respectively) and vertical column density of tropospheric nitrogen dioxide (NO₂) in the Earth’s atmosphere at a horizontal/spatial resolution of less than or equal to 3 km by the single satellite platform. The objectives of the GOSAT-GW’s GHG observing mission include (1) monitoring of whole atmosphere global-mean concentrations of GHGs, (2) verification of national (or country-specific) anthropogenic emissions inventory of GHGs, and (3) detection of GHGs emissions from large emission sources, such as megacities, power plants, and permafrost. With a nominal lifetime of 7 years, the GOSAT-GW will provide space-based constraints on the anthropogenic GHG emissions, contributing to the mitigation of climate change, in particular, supporting the Global Stocktake (GST) mechanism, a key element in the Paris Agreement.