posted on 2024-11-14, 16:15authored byI Morino, O Uchino, M Inoue, Y Yoshida, T Yokota, P Wennberg, G C Toon, Debra Wunch, C M Roehl, J Notholt, T Warneke, Janina Messerschmidt, David GriffithDavid Griffith, Nicholas DeutscherNicholas Deutscher, V Sherlock, B Connor, J Robinson, R Sussmann, M Rettinger
Column-averaged volume mixing ratios of carbon dioxide and methane retrieved from the Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed observation (GOSAT SWIR XCO2 and XCH4) were compared with the reference data ob- 5 tained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). Through calibrations of g-b FTSs with airborne in-situ measurements, the uncertainty of XCO2 and XCH4 associated with the g-b FTS was determined to be 0.8 ppm (0.2%) and 4 ppb (0.2%), respectively. The GOSAT products are validated with 10 these calibrated g-b FTS data. Preliminary results are as follows: The GOSAT SWIR XCO2 and XCH4 (Version 01.xx) are biased low by 8.85±4.75 ppm (2.3±1.2%) and 20.4±18.9 ppb (1.2±1.1%), respectively. The precision of the GOSAT SWIR XCO2 and XCH4 is considered to be about 1%. The latitudinal distributions of zonal means of the GOSAT SWIR XCO2 and XCH4 show similar features to those of the g-b FTS data.
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Morino, I., Uchino, O., Inoue, M., Yoshida, Y., Yokota, T., Wennberg, P., Toon, G., Wunch, D., Roehl, C. M., Notholt, J., Warneke, T., Messerschmidt, J., Griffith, D. W., Deutscher, N. M., Sherlock, V., Connor, B., Robinson, J., Sussmann, R. & Rettinger, M. (2010). Preliminary validation of column-averaged volume mixing ratios of carbon dioxide and methane retrieved from GOSAT short-wavelength infrared spectra. Atmospheric Measurement Techniques Discussions, 3 5613-5643.