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    Single Radar Recovery of Cross-Beam Wind Components Using a Modified Moving Frame of Reference Technique

    Source: Journal of Atmospheric and Oceanic Technology:;1999:;volume( 016 ):;issue: 008::page 1003
    Author:
    Liou, Yu-Chieng
    DOI: 10.1175/1520-0426(1999)016<1003:SRROCB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The moving frame of reference technique is modified so that the unobserved cross-beam wind components can be retrieved, with high resolution, from data measured by either single-Doppler or conventional radar. In this modified algorithm the reflectivity fields detected by consecutive radar scans are used to find a moving frame of reference for which the reflectivity measurements are as stationary as possible. After interpolating all of the observational data onto this optimal moving frame and assuming that the wind field is in a steady state for several radar scans, one can formulate a cost function that contains the following weak constraints: 1) conservation of reflectivity; 2) a geometric relationship between the radial velocity Vr and its Cartesian components u, ?, w; 3) incompressibility; and 4) small vertical vorticity. By minimizing this cost function, a complete three-dimensional wind field can be constructed. Using simulated data to test this method against the original moving-frame technique, it is found that the retrieval results are improved significantly. The modified method can sustain different sources of errors. This property is needed if the application of this method to real Doppler radar datasets is desired. When only reflectivity data are available, the modified method can still catch the principal feature embedded in the true wind field, which implies that the utility of a conventional radar?if equipped by this modified method?might be promoted further. Finally, the computation is economical, which is important for operational purposes. Overall, the modification proposed in this study substantially increases the moving-frame technique?s applicability.
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      Single Radar Recovery of Cross-Beam Wind Components Using a Modified Moving Frame of Reference Technique

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4151356
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    contributor authorLiou, Yu-Chieng
    date accessioned2017-06-09T14:15:03Z
    date available2017-06-09T14:15:03Z
    date copyright1999/08/01
    date issued1999
    identifier issn0739-0572
    identifier otherams-1566.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4151356
    description abstractThe moving frame of reference technique is modified so that the unobserved cross-beam wind components can be retrieved, with high resolution, from data measured by either single-Doppler or conventional radar. In this modified algorithm the reflectivity fields detected by consecutive radar scans are used to find a moving frame of reference for which the reflectivity measurements are as stationary as possible. After interpolating all of the observational data onto this optimal moving frame and assuming that the wind field is in a steady state for several radar scans, one can formulate a cost function that contains the following weak constraints: 1) conservation of reflectivity; 2) a geometric relationship between the radial velocity Vr and its Cartesian components u, ?, w; 3) incompressibility; and 4) small vertical vorticity. By minimizing this cost function, a complete three-dimensional wind field can be constructed. Using simulated data to test this method against the original moving-frame technique, it is found that the retrieval results are improved significantly. The modified method can sustain different sources of errors. This property is needed if the application of this method to real Doppler radar datasets is desired. When only reflectivity data are available, the modified method can still catch the principal feature embedded in the true wind field, which implies that the utility of a conventional radar?if equipped by this modified method?might be promoted further. Finally, the computation is economical, which is important for operational purposes. Overall, the modification proposed in this study substantially increases the moving-frame technique?s applicability.
    publisherAmerican Meteorological Society
    titleSingle Radar Recovery of Cross-Beam Wind Components Using a Modified Moving Frame of Reference Technique
    typeJournal Paper
    journal volume16
    journal issue8
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(1999)016<1003:SRROCB>2.0.CO;2
    journal fristpage1003
    journal lastpage1016
    treeJournal of Atmospheric and Oceanic Technology:;1999:;volume( 016 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian