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Titre du document / Document title

Cloud liquid water, mean droplet radius, and number density measurements using a Raman lidar

Auteur(s) / Author(s)

WHITEMAN D. N. (1) ; MELFI S. H. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Laser Remote Sensing Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland, ETATS-UNIS
(2) Department of Physics, University of Maryland, Baltimore County, Baltimore, ETATS-UNIS

Résumé / Abstract

A new technique for measuring cloud liquid water, mean droplet radius, and droplet number density is outlined. The technique is based on simultaneously measuring Raman and Mie scattering from cloud liquid droplets using a Raman lidar. Laboratory experiments on liquid microspheres have shown that the intensity of Raman scattering is proportional to the amount of liquid present in the spheres. This fact is used as a constraint on calculated Mie intensity assuming a gamma function particle size distribution. The resulting retrieval technique is shown to give stable solutions with no false minima. It is tested using Raman lidar data where the liquid water signal was seen as an enhancement to the water vapor signal. The general relationship of retrieved average radius and number density is consistent with traditional cloud physics models. Sensitivity to the assumed maximum cloud liquid water amount and the water vapor mixing ratio calibration are tested. Improvements to the technique are suggested.

Revue / Journal Title

Journal of geophysical research    ISSN  0148-0227 

Source / Source

Congrès
International Conference on Precipitation No6, Hawaii , ETATS-UNIS (29/06/1998)
1999, vol. 104, no D24, pp. 31435-31669 (32 ref.), pp. 31411-31419

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1949-2012) (Revue)

Mots-clés anglais / English Keywords

Cloud physics

;

Water content

;

Droplet

;

Diameter

;

Density

;

Raman scattering

;

Mie scattering

;

Measurement method

;

Radar observation

;

Mots-clés français / French Keywords

Physique nuage

;

Teneur eau

;

Gouttelette

;

Diamètre

;

Densité

;

Diffusion Raman

;

Diffusion Mie

;

Méthode mesure

;

Observation radar

;

Mots-clés espagnols / Spanish Keywords

Física nube

;

Dosis agua

;

Gotita

;

Diámetro

;

Densidad

;

Difusión Ramán

;

Difusión Mie

;

Método medida

;

Observación radar

;

Localisation / Location

INIST-CNRS, Cote INIST : 3144, 35400008112683.0380

Nº notice refdoc (ud4) : 1232259



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