[A-CG49] Greenhouse Gas Monitoring from Space: Current Capabilities, Challenges, and Future Needs

[ACG49-03] GOSAT collaboration activities with OCO-2 for calibration and validation

*Kei Shiomi¹、Akihiko Kuze¹、Hiroshi Suto¹、Nobuhiro Kikuchi¹、Mariko HASHIMOTO¹、Fumie KATAOKA² (1.Japan Aerospace Exploration Agency、2.RESTEC)

キーワード：CO2, GOSAT, Calibration, Validation, OCO-2

JAXA’s GOSAT has been operating since 2009 to monitor the greenhouse gases carbon dioxide (CO2) and methane (CH4) by a Fourier Transform Spectrometer (TANSO-FTS). The column-average dry air mole fractions of CO2 (XCO2), and CH4 (XCH4) are measured from space using surface-reflected sunlight at near-IR wavelengths. NASA’s OCO-2 has been operating since 2014, carries a grating spectrometer to make precise XCO2 observations with a-few-kilometer resolution. The other opportunities are target observations at particular calibration and validation sites with deploying ground-based measurements.
JAXA has been operating a ground-based FTS with high spectral resolution at Saga University as a member of the Total Carbon Column Observing Network (TCCON) since July 2011. XCO2 and XCH4 are estimated from direct sunlight spectra with high accuracy. TCCON dataset is utilized to make validation for the satellite observations such as GOSAT and OCO-2 with simultaneous measurements. GOSAT team also conducts the calibration and validation campaign at Railroad Valley, Nevada US desert every summer season collaborated with OCO-2 team. We also measure XCO2 and XCH4 by a portable FTS on the field. We will present our activities.