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ATBD - GHG-CCI

ATBD - GHG-CCI

ESA Climate Change

ESA Climate Change Initiative (CCI) Algorithm Theoretical Basis Document Version 2 (ATBDv2) – UoL-FP for the Essential Climate Variable (ECV) Greenhouse Gases (GHG) Page 24 Version 2 – Draft 1 18 March 2013 Saturation Test Band 2 Polarisation S Number of Cross Track Points Cross Track Angle Error (Degrees) Along Track Angle Error (Degrees) 0 4.0x10 -5 Instrument saturation Flag determined from L1B radiance. -1 10 Filters out invalid cross-track values. -0.007 0.007 Reduce geolocation uncertainty. -0.05 0.05 Reduce geolocation uncertainty. A Posterior Error (ppm) 0 1.6 Filters out significantly poor retrievals. Retrieved AOD Aerosol profile 1 Retrieved AOD Aerosol profile 2 0 0.15 Removes any soundings with high AOD. 0 0.15 Removes any soundings with high AOD. Retrieved AOD Total 0 0.2 Removes any soundings with high AOD. Albedo band 1 0 0.45 Removes high-albedo cases (High-gain only) CO2 Ratio 0.96 1.01 Ratio between band 2 and band 3 CO2 H2O Ratio 0.96 1.2 Ratio between band 2 and band 3 H2O Aerosol Ratio 0 3 Ratio between Aerosol 1 and Aerosol 2 AOD It should be noted that all the screen criteria for CO 2 are still under development and may change in the future. 3.4.3.2 Methane Full-Physics Screen Currently the methane full-physics post-screen is the same as the CO2 post-screen as described in Section 3.4.3.1 but updates are expected as the retrieval is further developed. 3.4.3.3 Methane Proxy Screen The methane is post-screened based on the algorithm convergence criteria as above (i.e. outcome =1, cost_div = F, conv_flag = T) as well as on the normalised CHI-Squared value for both the CO 2 and CH 4 . Currently a threshold of 0.4 < CHI-Square CH 4 < 3.0 and 0.4 < CHI-Square CO 2 < 2.0 . Currently all soundings below 60°S are also removed (i.e. Antarctica).

ESA Climate Change Initiative (CCI) Algorithm Theoretical Basis Document Version 2 (ATBDv2) – UoL-FP for the Essential Climate Variable (ECV) Greenhouse Gases (GHG) Page 25 Version 2 – Draft 1 18 March 2013 4 References Boesch et al., 2011 Boesch, H., D. Baker, B. Connor, D. Crisp, and C. Miller, Global characterization of CO 2 column retrievals from shortwave-infrared satellite observations of the Orbiting Carbon Observatory-2 mission, Remote Sensing, 3 (2), 270-304, 2011. Boesch et al., 2006 Boesch, H., Toon, G. C., Sen, B., Washenfelder, R. A., Wennberg, P. O., Buchwitz, M., de Beek, R., Burrows, J. P., Crisp, D., Christi, M., Connor, B. J., Natraj, V., and Yung, Y. L.: Space-based near-infrared CO 2 measurements: Testing the Orbiting Carbon Observatory retrieval algorithm and validation concept using SCIAMACHY observations over Park Falls, Wisconsin, J. Geophys. Res., 111, D23302, doi:10.1029/2006JD007080, 2006. Chevallier2010 Chevallier, F., P. Ciais, T. J. Conway, T. Aalto, B. E. Anderson, P. Bousquet, E. G. Brunke, L. Ciattaglia, Y. Esaki, M. Fröhlich, A.J. Gomez, A.J. Gomez- Pelaez, L. Haszpra, P. Krummel, R. Langenfelds, M. Leuenberger, T. Machida, F. Maignan, H. Matsueda, J. A. Morguí, H. Mukai, T. Nakazawa, P. Peylin, M. Ramonet, L. Rivier, Y. Sawa, M. Schmidt, P. Steele, S. A. Vay, A. T. Vermeulen, S. Wofsy, D. Worthy,2010: CO2 surface fluxes at grid point scale estimated from a global 21-year reanalysis of atmospheric measurements. J. Geophys. Res., 115, D21307, doi:10.1029/2010JD013887 Connor et al., 2008 Connor, B. J., H. Boesch, G. Toon, B. Sen, C. Miller, and D. Crisp, Orbiting Carbon Observatory: Inverse method and prospective error analysis, J. Geophys. Res., 113, D05305, doi:10.1029/2006JD008336, 2008. Crisp et al., 2012 D. Crisp, B. M. Fisher, C. O'Dell, C. Frankenberg, R. Basilio, H. Bösch, L. R. Brown, R. Castano, B. Connor, N. M. Deutscher, A. Eldering, D. Griffith, M. Gunson, A. Kuze, L. Mandrake, J. McDuffie, J. Messerschmidt, C. E. Miller, I. Morino, V. Natraj, J. Notholt, D. M. O'Brien, F. Oyafuso, I. Polonsky, J. Robinson, R. Salawitch, V. Sherlock, M. Smyth, H. Suto, T. E. Taylor, D. R. Thompson, P. O. Wennberg, D. Wunch, and Y. L. Yung, Atmos. Meas. Tech., 5, 687-707, 2012 ECMWF Technical Notes, MARS User Guide, User Support, Operations Department, 2008. Eguchi, N., Yokota, T., and Inoue, G., Characteristics of cirrus clouds from ICESat/GLAS observations, GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L09810, doi:10.1029/2007GL029529, 2007. HAMAZAKI, T., GOSAT Mission Overview, 3 rd IWGGMS Meeting, May 30 2006, Tsukuba, Japan, 2006. Kahn et al., 2001 Kahn, R.; Banerjee, P.; McDonald, D. Sensitivity of multiangle imaging to natural mixtures of aerosols over ocean. J. Geophys. Res., 106, D16., 2001.

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