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    The 27–28 October 1986 FIRE IFO Cirrus Case Study: Cloud Optical Properties Determined by High Spectral Resolution Lidar

    Source: Monthly Weather Review:;1990:;volume( 118 ):;issue: 011::page 2344
    Author:
    Grund, C. J.
    ,
    Eloranta, E. W.
    DOI: 10.1175/1520-0493(1990)118<2344:TOFICC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: During the FIRE cirrus IFO, the High Spectral Resolution Lidar (HSRL) was operated from a roof top site on the University of Wisconsin?Madison campus. Because the HSRL technique separately measures the molecular and cloud particle backscatter components of the lidar return, the optical thickness is determined independent of particle backscatter. This is accomplished by comparing the known molecular density distribution to the observed decrease in molecular backscatter signal with altitude. The particle to molecular backscatter ratio yields calibrated measurements of backscatter cross section that can be plotted to reveal cloud morphology without distortion due to attenuation. Changes in cloud particle size shape and phase affect the backscatter to extinction ratio (backscatter-phase function). The HSRL independently measures cloud particle backscatter phase function. This paper presents a quantitative analysis of the HSRL cirrus cloud data acquired over an ?33 hour period of continuous near-zenith observations. Correlations between small-scale wind structure and cirrus cloud morphology have been observed. These correlations can bias the mite averaging inherent in wind profiling lidars of modest vertical resolution, leading to increased measurement errors at cirrus altitudes. Extended periods of low intensity backscatter were noted between more strongly organized cirrus cloud activity. Optical thicknesses ranging from 0.01?1.4, backscatter-phase functions between 0.02?0.065 sr?1, and backscatter cross sections spanning 4 orders of magnitude were observed. The altitude relationship between cloud top and bottom boundaries and the cloud optical center altitude was dependent on the type of formation observed. Cirrus features were observed with characteristic wind drift estimated horizontal sizes of 5 km?400 km. The clouds frequently exhibited cellular structure with vertical to horizontal dimension ratios of 1:5?1:1.
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      The 27–28 October 1986 FIRE IFO Cirrus Case Study: Cloud Optical Properties Determined by High Spectral Resolution Lidar

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4202492
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    • Monthly Weather Review

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    contributor authorGrund, C. J.
    contributor authorEloranta, E. W.
    date accessioned2017-06-09T16:08:01Z
    date available2017-06-09T16:08:01Z
    date copyright1990/11/01
    date issued1990
    identifier issn0027-0644
    identifier otherams-61684.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4202492
    description abstractDuring the FIRE cirrus IFO, the High Spectral Resolution Lidar (HSRL) was operated from a roof top site on the University of Wisconsin?Madison campus. Because the HSRL technique separately measures the molecular and cloud particle backscatter components of the lidar return, the optical thickness is determined independent of particle backscatter. This is accomplished by comparing the known molecular density distribution to the observed decrease in molecular backscatter signal with altitude. The particle to molecular backscatter ratio yields calibrated measurements of backscatter cross section that can be plotted to reveal cloud morphology without distortion due to attenuation. Changes in cloud particle size shape and phase affect the backscatter to extinction ratio (backscatter-phase function). The HSRL independently measures cloud particle backscatter phase function. This paper presents a quantitative analysis of the HSRL cirrus cloud data acquired over an ?33 hour period of continuous near-zenith observations. Correlations between small-scale wind structure and cirrus cloud morphology have been observed. These correlations can bias the mite averaging inherent in wind profiling lidars of modest vertical resolution, leading to increased measurement errors at cirrus altitudes. Extended periods of low intensity backscatter were noted between more strongly organized cirrus cloud activity. Optical thicknesses ranging from 0.01?1.4, backscatter-phase functions between 0.02?0.065 sr?1, and backscatter cross sections spanning 4 orders of magnitude were observed. The altitude relationship between cloud top and bottom boundaries and the cloud optical center altitude was dependent on the type of formation observed. Cirrus features were observed with characteristic wind drift estimated horizontal sizes of 5 km?400 km. The clouds frequently exhibited cellular structure with vertical to horizontal dimension ratios of 1:5?1:1.
    publisherAmerican Meteorological Society
    titleThe 27–28 October 1986 FIRE IFO Cirrus Case Study: Cloud Optical Properties Determined by High Spectral Resolution Lidar
    typeJournal Paper
    journal volume118
    journal issue11
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1990)118<2344:TOFICC>2.0.CO;2
    journal fristpage2344
    journal lastpage2355
    treeMonthly Weather Review:;1990:;volume( 118 ):;issue: 011
    contenttypeFulltext
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