Multiple Backscattering and Depolarization from Water Clouds for a Pulsed Lidar System

Liou, Kuo‐Nan; Schotland, R. M.

doi:10.1175/1520-0469(1971)028<0772:mbadfw>2.0.co;2

Cited by 68 publications

(44 citation statements)

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“…Liou and Lahore (1974) and Sassen (1974) demonstrated in theoretical and laboratory experiments, that non-spherical ice crystals will generate a significant component of cross-polarization from a polarized incident beam whereas spherical water droplets largely scatter light that retains the polarization state of the incident radiation. Schotland et al (1971), Pal and Carswell (1973), Sassen (1977), andPlatt (1977) demonstrated the feasibility and applicability of ice/water discrimination from ground-based lidar systems. More recently, Spinhirne et al (1983) accurately measured a cloud top structure and the depolarization ratio with a polarization lidar operated from a high altitude aircraft.…”

Section: Introductionmentioning

confidence: 73%

“…This behavior could be attributed to multiple scattering by small water droplets in the cloud. Theoretical estimates of depolarization due to multiple scattering from spherical cloud droplets show a trend similar to these observed data (Liou and Schotland, 1971). However, as the depolarization ratios in Figs.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…An alternative explanation could be that the strong backscatter and the low depolarization ratio could be due to horizontally oriented ice plates (Platt, 1978;Liou, 1986). According to Platt et al (1978), lidar observations of an ice cloud at the zenith angle gave a high reflection but a very small depolarization ratio.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…Simultaneous lidar observations and in-situ measurements will be useful to understand better the relationship between the depolarization ratio and the physical state of cloud particles. Accurate determination of the position of clouds by lidar will also be useful for the interpretation of the physical properties of cloud obtained by satellites (Liou, 1986 …”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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Polarization Properties of Middle and High Level Clouds Observed by Lidar

Uchino¹,

Tabata²,

Kai³

et al. 1988

Journal of the Meteorological Society of Japan

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For cirrus clouds observed on 24 and 27 February 1987, depolarization ratios were greater than 10 percents through the cloud layers where the atmospheric temperature was below -40*.On the other hand, cirrus clouds observed on 11 June 1987 showed variable vertical profiles of the depolarization ratios in the cloud layers where atmospheric temperatures were -20* to -40*. While there were regions of depolarization ratio of a few percents in the cloud layer, the layers with depolarization ratio greater than 10 percents lowered toward the cloud base with time. The rate of descent varied from about 0.74 to 1.28m/s. Depolarization ratios in high level clouds showed a tendency to increase when the atmospheric temperature decreased.

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Section: Introductionmentioning

confidence: 73%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

See 2 more Smart Citations

Polarization Properties of Middle and High Level Clouds Observed by Lidar

Uchino¹,

Tabata²,

Kai³

et al. 1988

Journal of the Meteorological Society of Japan

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“…The fact that a linear polarization lidar will detect a cross-polarized signal due to the occurrence of multiple-scattering in liquid water clouds has been recognised since at least 1970 [1]. Extensive field and laboratory observations [2] of the depolarization of laser radiation in water clouds have been made and various theoretical approaches have been developed ranging from Monte Carlo-based (MC-based) models to semianalytic approaches; see [4] for a review.…”

Section: Introductionmentioning

confidence: 99%

Depolarization Lidar Determination Of Cloud-Base Microphysical Properties

Donovan

Baltink

Henzing

et al. 2016

EPJ Web of Conferences

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The links between multiple-scattering induced depolarization and cloud microphysical properties (e.g. cloud particle number density, effective radius, water content) have long been recognised. Previous efforts to use depolarization information in a quantitative manner to retrieve cloud microphysical cloud properties have also been undertaken but with limited scope and, arguably, success. In this work we present a retrieval procedure applicable to liquid stratus clouds with (quasi-)linear LWC profiles and (quasi-)constant number density profiles in the cloud-base region. This set of assumptions allows us to employ a fast and robust inversion procedure based on a lookup-table approach applied to extensive lidar Monte-Carlo multiple-scattering calculations. An example validation case is presented where the results of the inversion procedure are compared with simultaneous cloud radar observations. In non-drizzling conditions it was found, in general, that the lidar-only inversion results can be used to predict the radar reflectivity within the radar calibration uncertainty (2-3 dBZ). Results of a comparison between ground-based aerosol number concentration and lidar-derived cloud base number considerations are also presented. The observed relationship between the two quantities is seen to be consistent with the results of previous studies based on aircraft-based in situ measurements.

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