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Year of CO2 Measurements: OCO-2 Science Team Meeting Insights and Analysis

This document summarizes the outcomes of the OCO-2 Science Team Meeting held on February 16-17, 2012, in Pasadena. It covers key measurements of CO2 gathered at Caltech, Palos Verdes, and Mt. Wilson, alongside findings from the Total Carbon Column Observing Network (TCCON). Notable collaborators include experts from JPL and Caltech. The report includes information on noise analysis, spectroscopic parameters, transmittance, and the implications of vertical gradients in current carbon uptake models. Influential references are cited to provide context on CO2 profiling methods.

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Year of CO2 Measurements: OCO-2 Science Team Meeting Insights and Analysis

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  1. Profile Retrieval Yuk Yung – PI Xun Jiang – Co-I* Collaborators – Sally Newman (Caltech), Elva Kuai* (JPL), Ed Olsen (JPL), Susan Kulawik (JPL) Charles Miller (JPL), Vijay Natraj(JPL), Brian Connor (NZ), Fai Li (Caltech), Run-Lie Shia (Caltech) OCO-2 Science Team Meeting 16-17 Feb 2012 Pasadena

  2. A Year of CO2 Measurements at Caltech, Palos Verdes, and Mt. Wilson (CARB)

  3. Information Theory Analysis for TCCON measurements Sa(i, i) = (3%)2 Noise=max(Tr)/snr (/ppm)

  4. Spectroscopic Parameters • 0 = 6243.9 cm-1 •  = 0.02 cm-1 • S = 1.5310-23 cm •  = 7.510-5 mbar cm-1

  5. Transmittance and its Jacobian for one absorption line with broadening CJ.dat.in CJ.dat.in

  6. Transmittance and reflectance and their Jacobianfor one absorption line with broadening CJ.dat.in CJ.dat.in

  7. Thanks • Kuai et al. 2012, JQSRT, in review • Shia et al. 2012, in preparation • Jiang et al. 2012, in preparation • JPL, AIRS, OCO-2, Dave Crisp, John Trauger, Jack Margolis, Linda Brown

  8. Extra Slides

  9. Motivation for profile retrieving of CO2 • Over-prediction of the annual-mean midday vertical gradients in most current model lead to miss-interpretation of carbon uptake in northern lands and tropical forests [Stephen et al., 2007, Sarrat et al., 2007] • Boundary layer CO2v.s. XCO2 [Keppel-Alekset al., 2011]

  10. Profile comparison 2004/07/12 2004/07/15 2004/08/02 2008/05/12 Park falls: Lamont: 2009/01/30 2009/07/31 2009/08/02 2009/08/03 2010/07/18

  11. Column comparison Park Falls and Lamont RMS = 0.50 ppm Wunch, et al., 2011 Bias: -1.4% -1.1% Precision: 0.13% 0.25%

  12. Total Carbon Column Observing Network (TCCON) • Ground-based FTS • Direct solar spectra in NIR. • Column-averaged abundance of CO2, CH4, N2O, HF, CO, H2O, and HDO • Validation resource for satellite measurements (OCO, GOSAT, SCIAMACHY,……)

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