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Preliminary validation of column-averaged volume mixing ratios of carbon dioxide and methane retrieved from GOSAT short-wavelength infrared spectra

Atmospheric Measurement Techniques (2011) 4(6) 1061-1076
DOI: 10.5194/amt-4-1061-2011
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Abstract

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 calibrated data obtained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). 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 standard deviation of the GOSAT SWIR XCO2 and XCH4 is about 1 % (1 σ) after correcting the negative biases of XCO2 and XCH4 by 8.85 ppm and 20.4 ppb, respectively. The latitudinal distributions of zonal means of the GOSAT SWIR XCO2 and XCH4 show similar features to those of the g-b FTS data except for the negative biases in the GOSAT data. © Author(s) 2011.

Figures

  • Table 1. Ground-based FTS sites used for GOSAT product validation.
  • Fig. 1. Ground-based FTS sites used for the GOSAT product validation in the present study.
  • Figures 2 and 3 show the global distribution of the monthlyaveraged GOSAT SWIR XCO2 and XCH4 data, gridded in 1.5◦ by 1.5◦ bins in April and October 2009, respectively. These retrievals satisfy the filter criteria over North Africa, the Arabian Peninsula, and Australia. Data over land are obtained mainly for 10–60◦ N and 15–45◦ S in April, and 10– 50◦ N and 0–50◦ S in October. Data over ocean are retrieved in the regions of 10◦ S–30◦ N in April and 40◦ S–10◦ N in October by observing the specular reflection of sunlight in the direction of sunglint.
  • Table 2. (a) Spectroscopic databases of CO2, CH4, H2O and O2 molecules and (b) parameters retrieved from bands 1 and 2 of the TANSO FTS in the Ver.01.xx.
  • Fig. 3. Global distribution of GOSAT SWIR XCH4 averaged monthly in 1.5 by 1.5 degree bins for (a) April and (b) October in 2009.
  • Table 3. Left side: the average and one standard deviation (1σ) of the difference between GOSAT XCO2 and g-b FTS XCO2 for the nine TCCON sites. Right side: the average and one standard deviation (1σ) of the difference normalized to g-b FTS XCO2 (given in percent). Note that the number of data listed here indicates the count of valid cases in which g-b FTS data were collected within ±30 min of the GOSAT overpass time and corresponding GOSAT XCO2 values were successfully retrieved.
  • Table 4. As in Table 3 except for XCH4 .
  • Figure 7 shows the scatter diagram between the GOSAT data and the g-b FTS data for all sites. The slope of the regression line with no intercept is 0.998 and the correlation coefficient is 0.681. The difference between the GOSAT data and the g-b FTS data at each site is shown in Table 4. The difference of the GOSAT data to the g-b FTS data is −20.4± 18.9 ppb or −1.2± 1.1 %.

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Morino, I., Uchino, O., Inoue, M., Yoshida, Y., Yokota, T., Wennberg, P. O., … Rettinger, M. (2011). Preliminary validation of column-averaged volume mixing ratios of carbon dioxide and methane retrieved from GOSAT short-wavelength infrared spectra. Atmospheric Measurement Techniques, 4(6), 1061–1076. https://doi.org/10.5194/amt-4-1061-2011

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