YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • AMS
    • Journal of Applied Meteorology
    • View Item
    •   YE&T Library
    • AMS
    • Journal of Applied Meteorology
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    Vortex Signature Recognition by a Doppler Radar

    Source: Journal of Applied Meteorology:;1970:;volume( 009 ):;issue: 004::page 661
    Author:
    Donaldson, Ralph J.
    DOI: 10.1175/1520-0450(1970)009<0661:VSRBAD>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A scanning Doppler radar has capability for measurement of the tangential shear of radial velocity or gradient of the radial component of velocity in a direction normal to the radial vector. Tangential shear of sufficient magnitude in a horizontal direction reveals one term of the expression for vorticity in a horizontal plane. A vortex is reasonably well identified by Doppler radar if the shear is sufficiently steady during the time required for half a revolution of a vortex, and is further confirmed by extension of the shear pattern throughout a depth greater than its diameter, and by invariance of the character of the shear with respect to a change in viewing angle. A vortex in solid rotation has a characteristically uniform signature on a Doppler velocity display which may, however, be smoothed down according to the resolution limitations of the antenna beam. Sharp velocity peaks are rounded down to roughly half the magnitude of the velocity interval encompassed within the half-power antenna beamwidth. An illustration of a persistent vortex at altitudes of 1?4 km in a severe thunderstorm revealed a solidly rotating core averaging 600 m in radius with vorticities as high as 0.06 sec?1, surrounded by a much larger area of considerably smaller vorticity. During a 30-min period, an echo hole was found at a height of 1.5?2 km in the center of the vortex, with a structure quite similar in shape to the echo-free vault which has occurred on a larger scale in several tornadic storms in the Great Plains.
    • Download: (955.1Kb)
    • Show Full MetaData Hide Full MetaData
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Vortex Signature Recognition by a Doppler Radar

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4223212
    Collections
    • Journal of Applied Meteorology

    Show full item record

    contributor authorDonaldson, Ralph J.
    date accessioned2017-06-09T17:09:38Z
    date available2017-06-09T17:09:38Z
    date copyright1970/08/01
    date issued1970
    identifier issn0021-8952
    identifier otherams-8033.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223212
    description abstractA scanning Doppler radar has capability for measurement of the tangential shear of radial velocity or gradient of the radial component of velocity in a direction normal to the radial vector. Tangential shear of sufficient magnitude in a horizontal direction reveals one term of the expression for vorticity in a horizontal plane. A vortex is reasonably well identified by Doppler radar if the shear is sufficiently steady during the time required for half a revolution of a vortex, and is further confirmed by extension of the shear pattern throughout a depth greater than its diameter, and by invariance of the character of the shear with respect to a change in viewing angle. A vortex in solid rotation has a characteristically uniform signature on a Doppler velocity display which may, however, be smoothed down according to the resolution limitations of the antenna beam. Sharp velocity peaks are rounded down to roughly half the magnitude of the velocity interval encompassed within the half-power antenna beamwidth. An illustration of a persistent vortex at altitudes of 1?4 km in a severe thunderstorm revealed a solidly rotating core averaging 600 m in radius with vorticities as high as 0.06 sec?1, surrounded by a much larger area of considerably smaller vorticity. During a 30-min period, an echo hole was found at a height of 1.5?2 km in the center of the vortex, with a structure quite similar in shape to the echo-free vault which has occurred on a larger scale in several tornadic storms in the Great Plains.
    publisherAmerican Meteorological Society
    titleVortex Signature Recognition by a Doppler Radar
    typeJournal Paper
    journal volume9
    journal issue4
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1970)009<0661:VSRBAD>2.0.CO;2
    journal fristpage661
    journal lastpage670
    treeJournal of Applied Meteorology:;1970:;volume( 009 ):;issue: 004
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian