Data obtained by the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) on board the Global Observing SATellite for Greenhouse gases and Water cycle (GOSAT-GW) will be processed in stages and distributed to users as TANSO-3 products. In order to start data processing immediately after the launch of GOSAT-GW, ground systems are currently being developed by the Japan Aerospace Exploration Agency (JAXA) and the National Institute for Environmental Studies (NIES). NIES is responsible for making Level 2 products from Level 1 products from JAXA, and for storing these products and delivering them to users. The NIES ground system consists of three systems: 1) the GOSAT 3rd-generation Data Processing/operating System (G3DPS) for product handling, storage and distribution, and for arranging observation requests; 2) the GOSAT-GW NO2 Data Processing System (GNDPS), which is responsible for processing Level 2 product (NO2) on the commercial cloud service; and 3) the GOSAT Operational and research Computing Facility (GOCF), which provides large-scale computing resources for Level 2 product (greenhouse gas, GHG) processing. In the future, TANSO-3 products will be available to general users through the GOSAT-GW TANSO-3 Product Archive (G3PA) website constructed on G3DPS. Dealing with the explosive increase in computational workload due to the increase in observation points from TANSO-3 for calculating column-averaged dry-air mole fractions of carbon dioxide (XCO2) and methane (XCH4) is one of the challenges for the NIES ground system and retrieval algorithms. At the time of writing, in FY2023, ground system tests are underway in coordination with the optimization of Level 2 product processing programs.
