Journal ArticleDOI
Examination of the traditional Raman lidar technique. I. Evaluating the temperature-dependent lidar equations.
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TLDR
The results indicate that, for the range of temperatures encountered in the troposphere, the magnitude of the temperature-dependent effect can reach 10% or more for narrowband Raman water-vapor measurements.Abstract:
The essential information required for the analysis of Raman lidar water vapor and aerosol data acquired by use of a single laser wavelength is compiled here and in a companion paper [Appl. Opt. 42, 2593 (2003)]. Various details concerning the evaluation of the lidar equations when Raman scattering is measured are covered. These details include the influence of the temperature dependence of both pure rotational and vibrational-rotational Raman scattering on the lidar profile. The full temperature dependence of the Rayleigh-Mie and Raman lidar equations are evaluated by use of a new form of the lidar equation where all the temperature dependence is carried in a single term. The results indicate that, for the range of temperatures encountered in the troposphere, the magnitude of the temperature-dependent effect can reach 10% or more for narrowband Raman water-vapor measurements. Also, the calculation of atmospheric transmission, including the effects of depolarization, is examined carefully. Various formulations of Rayleigh cross-section determination commonly used in the lidar field are compared and reveal differences of as much as 5% among the formulations. The influence of multiple scattering on the measurement of aerosol extinction with the Raman lidar technique is considered, as are several photon pulse pileup-correction techniques.read more
Citations
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Journal ArticleDOI
Raman Lidar Profiling of Tropospheric Water Vapor over Kangerlussuaq, Greenland
Ryan R. Neely,Jeffrey P. Thayer +1 more
TL;DR: In this article, a new measurement capability has been implemented in the Arctic Lidar Technology (ARCLITE) system at the Sondrestrom upper-atmosphere research facility near Kangerlussuaq, Greenland (67.0°N, 50.9°W), enabling estimates of atmospheric water vapor through the troposphere.
Journal ArticleDOI
Ground-based lidar and microwave radiometry synergy for high vertical resolution absolute humidity profiling
TL;DR: In this paper, an optimal estimation method (OEM) was proposed to combine microwave radiometers (MWRs) and Raman Lidar (RL) data for atmospheric humidity profiles.
Journal ArticleDOI
Correct equations and common approximations for calculating Rayleigh scatter in pure gases and mixtures and evaluation of differences.
TL;DR: The traditional Rayleigh scattering equation as modified by King for scatter from a pure gas is correct, whereas another version sometimes appearing in modern literature is erroneous.
Journal ArticleDOI
Improved cloud-phase determination of low-level liquid and mixed-phase clouds by enhanced polarimetric lidar
Robert A. Stillwell,Robert A. Stillwell,Ryan R. Neely,Jeffrey P. Thayer,Matthew D. Shupe,Matthew D. Shupe,David D. Turner +6 more
TL;DR: In this paper, a method to identify and remove lidar system effects from atmospheric polarization measurements is presented, which can be used to improve the accuracy of cloud radiative effects attribution.
Journal ArticleDOI
Lidar measurements of Raman scattering at ultraviolet wavelength from mineral dust over East Asia
Boyan Tatarov,Detlef Müller,Dongho Shin,Sung Kyun Shin,Ina Mattis,Patric Seifert,Youngmin Noh,Youngwoong Kim,Nobuo Sugimoto +8 more
TL;DR: A novel measurement channel that utilizes Raman scattering from silicon dioxide (SiO2) quartz at an ultraviolet wavelength (361 nm) to identify in a comparably direct way the mineral quartz content in mixed pollution plumes that consist, e.g., of a mix of desert dust and urban pollution.
References
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Journal ArticleDOI
Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations
Oleg Dubovik,Brent N. Holben,Thomas F. Eck,Thomas F. Eck,Alexander Smirnov,Yoram J. Kaufman,Michael D. King,Didier Tanré,Ilya Slutsker +8 more
TL;DR: In this paper, the AERONET network of ground-based radiometers were used to remotely sense the aerosol absorption and other optical properties in several key locations, and the results showed robust differentiation in both the magnitude and spectral dependence of the absorption, a property driving aerosol climate forcing.
Models for the aerosols of the lower atmosphere and the effects of humidity variations on their optical properties
Eric P. Shettle,Robert W. Fenn +1 more
TL;DR: In this paper, a review of the optical properties of these models are discussed and some comparisons of the model with experimental measurements are presented, as well as a comparison of their experimental basis.
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
Independent measurement of extinction and backscatter profiles in cirrus clouds by using a combined Raman elastic-backscatter lidar
TL;DR: Examples covering the measured range of extinction-to-backscatter ratios (lidar ratios) in ice clouds are presented and simple backscatter lidars can provide reliable information about the cloud optical depth and the mean cloud lidar ratio.