Journal ArticleDOI
Airborne High Spectral Resolution Lidar for profiling aerosol optical properties
Johnathan W. Hair,Chris A. Hostetler,Anthony L. Cook,David B. Harper,Richard Ferrare,Terry L. Mack,Wayne Welch,Luis Ramos Izquierdo,Floyd Hovis +8 more
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TLDR
The design of the airborne HSRL, the internal calibration and accuracy of the instrument, data products produced, and observations and calibration data from the first two field missions are discussed.Abstract:
A compact, highly robust airborne High Spectral Resolution Lidar (HSRL) that provides measurements of aerosol backscatter and extinction coefficients and aerosol depolarization at two wavelengths has been developed, tested, and deployed on nine field experiments (over 650 flight hours). A unique and advantageous design element of the HSRL system is the ability to radiometrically calibrate the instrument internally, eliminating any reliance on vicarious calibration from atmospheric targets for which aerosol loading must be estimated. This paper discusses the design of the airborne HSRL, the internal calibration and accuracy of the instrument, data products produced, and observations and calibration data from the first two field missions: the Joint Intercontinental Chemical Transport Experiment--Phase B (INTEX-B)/Megacity Aerosol Experiment--Mexico City (MAX-Mex)/Megacities Impacts on Regional and Global Environment (MILAGRO) field mission (hereafter MILAGRO) and the Gulf of Mexico Atmospheric Composition and Climate Study/Texas Air Quality Study II (hereafter GoMACCS/TexAQS II).read more
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THE CALIPSO MISSION: A Global 3D View of Aerosols and Clouds
David M. Winker,Jacques Pelon,James A. Coakley,Steven A. Ackerman,Robert J. Charlson,Peter R. Colarco,Pierre H. Flamant,Qiang Fu,Raymond M. Hoff,Chieko Kittaka,T. L. Kubar,H. Le Treut,M. P. McCormick,Gérard Mégie,Lamont R. Poole,Kathleen A. Powell,Chip Trepte,Mark A. Vaughan,Bruce A. Wielicki +18 more
TL;DR: CALIPSO as mentioned in this paper is a two-wavelength, polarization-sensitive lidar, along with two passive sensors operating in the visible and thermal infrared spectral regions for long-term atmospheric measurements from Earth's orbit.
Journal ArticleDOI
The CALIPSO Automated Aerosol Classification and Lidar Ratio Selection Algorithm
Ali Omar,David M. Winker,Mark A. Vaughan,Yongxiang Hu,Charles R. Trepte,Richard Ferrare,Kam-Pui Lee,Chris A. Hostetler,Chieko Kittaka,Raymond R. Rogers,Ralph Kuehn,Zhaoyan Liu +11 more
TL;DR: In this paper, the extinction-to-backscatter ratio (lidar ratio) selection scheme for the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) aerosol products is described.
Journal ArticleDOI
The MERRA-2 Aerosol Reanalysis, 1980 Onward. Part I: System Description and Data Assimilation Evaluation
Cynthia A. Randles,A. da Silva,V. Buchard,V. Buchard,Peter R. Colarco,Anton Darmenov,R. Govindaraju,Alexander Smirnov,Brent N. Holben,R. A. Ferrare,J. W. Hair,Yohei Shinozuka,Connor Flynn +12 more
TL;DR: This first of a pair of studies documents the MERRA-2 aerosol assimilation, including a description of the prognostic model, aerosol emissions, and the quality control of ingested observations, and provides initial validation and evaluation of the analyzed AOD fields.
Journal ArticleDOI
Fully Automated Detection of Cloud and Aerosol Layers in the CALIPSO Lidar Measurements
Mark A. Vaughan,Kathleen A. Powell,Ralph Kuehn,Stuart A. Young,David M. Winker,Chris A. Hostetler,William H. Hunt,Zhaoyan Liu,Matthew J. McGill,Brian Getzewich +9 more
TL;DR: An in-depth overview of the architecture and performance of the SIBYL algorithm is provided, which accomplishes its goals by integrating an adaptive context-sensitive profile scanner into an iterated multiresolution spatial averaging scheme.
Journal ArticleDOI
The MERRA-2 Aerosol Reanalysis, 1980 Onward. Part II: Evaluation and Case Studies
V. Buchard,V. Buchard,Cynthia A. Randles,A. da Silva,Anton Darmenov,Peter R. Colarco,R. Govindaraju,R. A. Ferrare,J. Hair,Andreas J. Beyersdorf,Luke D. Ziemba,Hongbin Yu,Hongbin Yu +12 more
TL;DR: A focus is placed on several major aerosol events to illustrate successes and weaknesses of the AOD assimilation: the Mount Pinatubo eruption, a Saharan dust transport episode, the California Rim Fire, and an extreme pollution event over China.
References
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Journal ArticleDOI
Stable analytical inversion solution for processing lidar returns
TL;DR: A simple analytical method is presented that shows some potential for application to the problem of extracting attenuation and backscatter coefficients in an inhomogeneous atmosphere from the return signal of a monostatic single-wavelength lidar system.
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Frequency-modulation spectroscopy: a new method for measuring weak absorptions and dispersions.
TL;DR: A new type of wavelength-modulation laser spectroscopy is accomplished by utilizing an external phase modulator driven at radio frequencies large compared to the width of the spectral feature of interest.
Journal ArticleDOI
Lidar inversion with variable backscatter/extinction ratios.
TL;DR: An alternative formulation is given herein which assumes the proportionality factor in the power law relationship is itself a function of range or extinction, and the resulting lidar equation is solvable.
Journal ArticleDOI
Rayleigh-scattering calculations for the terrestrial atmosphere
TL;DR: The dispersion of the depolarization factor is shown to affect the Rayleigh phase function slightly, by approximately 1% in the forward, backscattered, and 90° scattering-angle directions.
Journal ArticleDOI
Measurement of atmospheric aerosol extinction profiles with a Raman lidar
TL;DR: A method is presented that permits the determination of atmospheric aerosol extinction profiles from measured Raman lidar signals, no critical input parameters are needed, which could cause large uncertainties of the solution.