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contributor authorChiriaco, M.
contributor authorChepfer, H.
contributor authorNoel, V.
contributor authorDelaval, A.
contributor authorHaeffelin, M.
contributor authorDubuisson, P.
contributor authorYang, P.
date accessioned2017-06-09T16:15:29Z
date available2017-06-09T16:15:29Z
date copyright2004/07/01
date issued2004
identifier issn0027-0644
identifier otherams-64304.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4205404
description abstractThis study is intended to illustrate the potential advantage of combining lidar measurements and the split-window technique based on the infrared spectral information contained at the 8.65-, 11.15-, and 12.05-?m bands for inferring the microphysical properties of cirrus clouds. The lidar returns are employed to detect cirrus clouds. The optical properties of nonspherical ice crystals computed from the state-of-the-art scattering computational methods are used for the present forward radiative transfer simulation that fully accounts for both gaseous absorption and multiple scattering processes in the atmosphere. A combination of the radiances at the three infrared (IR) bands with lidar backscatter returns cannot uniquely specify the effective size of ice crystals because of its dependence on the particle aspect ratios. To avoid the shortcoming associated with a potential multivalued retrieval, lidar depolarization observation is used to constrain the specification of the particle aspect ratio in the retrieval implementation based on a precalculated lookup library. The present methodology for inferring the microphysical properties of cirrus clouds is implemented for nine cases by using the measurements from a 532-nm lidar located at the Palaiseau, France, ground-based site and the infrared spectral bands from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra platform. It is shown that the three IR wavelengths are quite complementary in constraining the retrieval of the particle size, leading to a significant advance in comparison with two-channel techniques, whereas the aspect ratio constraint due to lidar depolarization reduces the uncertainty of retrieved particle size by more than 20% for 70% of the cases and more than 65% for 40% of the cloud cases.
publisherAmerican Meteorological Society
titleImproving Retrievals of Cirrus Cloud Particle Size Coupling Lidar and Three-Channel Radiometric Techniques
typeJournal Paper
journal volume132
journal issue7
journal titleMonthly Weather Review
identifier doi10.1175/1520-0493(2004)132<1684:IROCCP>2.0.CO;2
journal fristpage1684
journal lastpage1700
treeMonthly Weather Review:;2004:;volume( 132 ):;issue: 007
contenttypeFulltext


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