Keywords:satellite observation, carbon cycle, inverse modeling
The Greenhouse gases Observing SATellite 2 (GOSAT-2) was launched, as the successor of GOSAT, on 29th October 2018 into a sun-synchronous orbit at an altitude of 613 km with 6-day revisit cycle, then the satellite has been operated with normal mode since 1st February 2019. GOSAT-2 is designed to measure atmospheric carbon dioxide (CO2), methane (CH4) and carbon monoxide (CO) with two instruments: The Thermal And Near-infrared Sensor for carbon Observation Fourier Transform Spectrometer 2 (TANSO-FTS-2) and the Cloud and Aerosol Imager 2 (TANSO-CAI-2). The GOSAT-2 mission inherits the main objective of the GOSAT that improves our knowledge of spatiotemporal variations of CO2 and CH4 in the atmosphere and the process governing their exchange between the atmosphere and the Earth's surface and contributes climate change studies and related environmental policy making. The GOSAT-2 project provides Level 1 radiance spectral products of GOSAT-2 observations for general users and released FTS-2 shortwave infrared (SWIR) Level 2 atmospheric concetration products to the GOSAT series' Research Announcement users. The GOSAT-2 Level 4 products will provide estimates of global surface fluxes on CO2 and CH4 based on the FTS-2 SWIR Level 2 products and surface observations. This presentation will introduce detailed features for the GOSTA-2 Level 4 product including the prior information and preliminary results on multi-year global CO2 flux estimates using GOSAT FTS SWIR Level 2 products, and additional information about the latest GOSAT-2 products.