• Winker, D. M., Vaughan M. A. , Omar A. H. , Hu Y. , Powell K. A. , Liu Z. , Hunt W. H. , and Young S. A. , 2009: Overview of the CALIPSO mission and CALIOP data processing algorithms. J. Atmos. Oceanic Technol., 26, 23102323, doi:10.1175/2009JTECHA1281.1.

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  • Winker, D. M., and Coauthors, 2010: The CALIPSO mission: A global 3D view of aerosols and clouds. Bull. Amer. Meteor. Soc., 91, 12111229, doi:10.1175/2010BAMS3009.1.

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  • Young, S. A., and Vaughan M. A. , 2009: The retrieval of profiles of particulate extinction from Cloud Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) data: Algorithm description. J. Atmos. Oceanic Technol., 26, 11051119, doi:10.1175/2008JTECHA1221.1.

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  • Young, S. A., Vaughan M. A. , Keuhn R. E. , and Winker M. , 2013: The retrieval of profiles of particulate extinction from Cloud–Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) data: Uncertainty and error sensitivity analyses. J. Atmos. Oceanic Technol., 30, 395428, doi:10.1175/JTECH-D-12-00046.1.

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  • 1 CSIRO Oceans and Atmosphere, Aspendale, Victoria, Australia
  • | 2 National Aeronautics and Space Administration, Hampton, Virginia
  • | 3 Space Science and Engineering Center, University of Wisconsin–Madison, Madison, Wisconsin
  • | 4 National Aeronautics and Space Administration, Hampton, Virginia
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Abstract

An error in a recent analysis of the sensitivity of retrievals of Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) particulate optical properties to errors in various input parameters is described. This error was in the specification of an intermediate variable that was used to write a general equation for the sensitivities to errors in either the renormalization (calibration) factor or in the lidar ratio used in the retrieval, or both. The result of this incorrect substitution (an additional multiplicative factor to the exponent of the particulate transmittance) was then copied to some intermediate equations; the corrected versions of which are presented here. Fortunately, however, all of the final equations for the specific cases of renormalization and lidar ratio errors are correct, as are all of the figures and approximations, because these were derived directly from equations for the specific errors and not from the equation for the general case. All of the other sections, including the uncertainty analyses and the analyses of sensitivities to low signal-to-noise ratios and errors in constrained retrievals, and the presentations of errors and uncertainties in simulated and actual data are unaffected.

Denotes Open Access content.

Corresponding author address: Stuart A. Young, CSIRO Oceans and Atmosphere, Private Bag No. 1, Aspendale VIC 3195, Australia. E-mail: stuart.young01@gmail.com

Abstract

An error in a recent analysis of the sensitivity of retrievals of Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) particulate optical properties to errors in various input parameters is described. This error was in the specification of an intermediate variable that was used to write a general equation for the sensitivities to errors in either the renormalization (calibration) factor or in the lidar ratio used in the retrieval, or both. The result of this incorrect substitution (an additional multiplicative factor to the exponent of the particulate transmittance) was then copied to some intermediate equations; the corrected versions of which are presented here. Fortunately, however, all of the final equations for the specific cases of renormalization and lidar ratio errors are correct, as are all of the figures and approximations, because these were derived directly from equations for the specific errors and not from the equation for the general case. All of the other sections, including the uncertainty analyses and the analyses of sensitivities to low signal-to-noise ratios and errors in constrained retrievals, and the presentations of errors and uncertainties in simulated and actual data are unaffected.

Denotes Open Access content.

Corresponding author address: Stuart A. Young, CSIRO Oceans and Atmosphere, Private Bag No. 1, Aspendale VIC 3195, Australia. E-mail: stuart.young01@gmail.com
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