scholarly journals Cirrus cloud microphysical and optical properties at southern and northern midlatitudes during the INCA experiment

2004 ◽  
Vol 109 (D20) ◽  
Author(s):  
Jean-François Gayet
Keyword(s):  
Optical Properties ◽  
Cirrus Cloud

Optical properties of the cirrus cloud ice crystals with preferred azimuthal orientation for polarization lidars with azimuthal scanning

2016 ◽  
Author(s):  
Alexander V. Konoshonkin ◽  
Natalia V. Kustova ◽  
Sergey V. Nasonov ◽  
Ilia D. Bryukhanov ◽  
Viktor A. Shishko ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ice Crystals ◽  
Cirrus Cloud ◽  
Cloud Ice

scholarly journals Variability in cirrus cloud properties using a Polly<sup>XT</sup> Raman lidar over high and tropical latitudes

2020 ◽  
Vol 20 (7) ◽  
pp. 4427-4444 ◽  
Author(s):  
Kalliopi Artemis Voudouri ◽  
Elina Giannakaki ◽  
Mika Komppula ◽  
Dimitris Balis
Keyword(s):  
Optical Properties ◽  
Cirrus Clouds ◽  
Cirrus Cloud ◽  
Raman Lidar ◽  
Mean Values ◽  
Cloud Optical Depth ◽  
Geometrical Properties ◽  
Depolarisation Ratio ◽  
Cloud Properties ◽  
Lidar Ratio

Abstract. Measurements of geometrical and optical properties of cirrus clouds, performed with a multi-wavelength PollyXT Raman lidar during the period 2008 to 2016, are analysed. The measurements were performed with the same instrument, during sequential periods, in three places at different latitudes, Gwal Pahari (28.43∘ N, 77.15∘ E; 243 m a.s.l.) in India, Elandsfontein (26.25∘ S, 29.43∘ E; 1745 m a.s.l.) in South Africa and Kuopio (62.74∘ N, 27.54∘ E; 190 m a.s.l.) in Finland. The lidar dataset was processed by an automatic cirrus cloud masking algorithm, developed in the frame of this work. In the following, we present a statistical analysis of the lidar-retrieved geometrical characteristics (cloud boundaries, geometrical thickness) and optical properties of cirrus clouds (cloud optical depth, lidar ratio, ice crystal depolarisation ratio) measured over the three areas that correspond to subtropical and subarctic regions as well as their seasonal variability. The effect of multiple scattering from ice particles to the derived optical products is also considered and corrected in this study. Our results show that cirrus layers, which have a noticeable monthly variability, were observed between 6.5 and 13 km, with temperatures ranging from −72 to −27 ∘C. The observed differences on cirrus clouds' geometrical and optical properties over the three regions are discussed in terms of latitudinal and temperature dependence. The latitudinal dependence of the geometrical properties is consistent with satellite observations, following the pattern observed with CloudSat, with decreasing values towards the poles. The geometrical boundaries have their highest values in the subtropical regions, and overall, our results seem to demonstrate that subarctic cirrus clouds are colder, lower and optically thinner than subtropical cirrus clouds. The dependence of cirrus cloud geometrical thickness and optical properties on mid-cirrus temperatures shows a quite similar tendency for the three sites but less variability for the subarctic dataset. Cirrus clouds are geometrically and optically thicker at temperatures between −45 and −35 ∘C, and a second peak is observed at lower temperatures ∼-70 ∘C for the subarctic site. Lidar ratio values also exhibit a pattern, showing higher values moving toward the poles, with higher mean values observed over the subarctic site. The dependency of the mid-cirrus temperatures on the lidar ratio values and the particle depolarisation values is further examined. Our study shows that the highest values of the cirrus lidar ratio correspond to higher values of cirrus depolarisation and warmer cirrus. The kind of information presented here can be rather useful in the cirrus parameterisations required as input to radiative transfer models and can be a complementary tool for satellite products that cannot provide cloud vertical structure. In addition, ground-based statistics of the cirrus properties could be useful in the validation and improvement of the corresponding derived products from satellite retrievals.

scholarly journals Correlations among the optical properties of cirrus-cloud particles: Implications for spaceborne remote sensing

2002 ◽  
Vol 29 (14) ◽  
pp. 13-1-13-4 ◽  
Author(s):  
J. Reichardt ◽  
S. Reichardt ◽  
A. Behrendt ◽  
T. J. McGee
Keyword(s):  
Remote Sensing ◽  
Optical Properties ◽  
Cirrus Cloud ◽  
Cloud Particles

Airborne validation of cirrus cloud properties derived from CALIPSO lidar measurements: Optical properties

2012 ◽  
Vol 117 (D9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Dennis L. Hlavka ◽  
John E. Yorks ◽  
Stuart A. Young ◽  
Mark A. Vaughan ◽  
Ralph E. Kuehn ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cirrus Cloud ◽  
Cloud Properties ◽  
Lidar Measurements

scholarly journals Multichannel Polarization Lidar Measurements of Aerosols and Cirrus Clouds

2020 ◽  
Vol 237 ◽  
pp. 07020
Author(s):  
Jan Bai Nee
Keyword(s):  
Optical Properties ◽  
Circular Polarization ◽  
Mueller Matrix ◽  
Cirrus Cloud ◽  
Scattering Media ◽  
Lidar System ◽  
Mueller Matrices ◽  
Lidar Measurements ◽  
Stokes Vectors ◽  
Channel Polarization

In this paper we report using a 6-channel polarization detector to measure optical properties of aerosols and clouds. The polarization lidar system is designed to measure Stokes vectors and Mueller matrices from back-scatterings of air, aerosols and clouds by using several polarizers of setting at different angles, and a retarder to measure circular polarization. The 4 components Stokes vectors of the scattering media are constructed and a case of tropopause cirrus cloud and stratospheric aerosols are measured with the Mueller matrix derived.

Ground-based measurement of cirrus cloud optical properties as validation to aircraft- and satellite-based cloud studies

2003 ◽  
Author(s):  
Daniel H. DeSlover ◽  
David D. Turner ◽  
David N. Whiteman ◽  
William L. Smith
Keyword(s):  
Optical Properties ◽  
Cirrus Cloud
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