GOSAT SWIRデータとTCCONデータにおけるCO2カラム濃度値(XCO2)の比較

Abstract

To investigate the bias of GOSAT column CO2 fraction (XCO2) retrieval data (SWIR), the data was compared with TCCON data. The time series of daily averaged XCO2 ofboth data sets showed differences and suggested the existence of the bias of GOSATdata. But the characteristics of the discrepancies vary with TCCON stations. In the timeseries of the specific station, the characteristics of the discrepancies changes year byyear. Correlations between the difference of XCO2 between GOSAT and TCCON data(ΔXCO2) and four parameters are also verified. Among the parameters, the differenceof surface pressure between retrieval data and a priori data showed higher correlation withΔXCO2.