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    On the Use of Doppler Radar–Derived Wind Fields to Diagnose the Secondary Circulations of Tornadoes

    Source: Journal of the Atmospheric Sciences:;2012:;Volume( 070 ):;issue: 004::page 1160
    Author:
    Nolan, David S.
    DOI: 10.1175/JAS-D-12-0200.1
    Publisher: American Meteorological Society
    Abstract: number of studies in recent years have used wind fields derived from portable Doppler radars in combination with the ground-based velocity track display (GBVTD) technique to diagnose the primary (tangential) and secondary (radial and vertical) circulations in tornadoes. These analyses indicate very strong vertical motions in the vortex core, in some cases with updrafts and downdrafts exceeding 100 m s?1. In addition, many of the analyses indicate strong radial outflow at low levels and in the vicinity of the low-level tangential wind maximum. This paper shows that strong outward motion at this location cannot be consistent with a tornado circulation that lasts more than a few minutes. In addition, using data from numerical simulations as truth, it is shown that using observed radial velocities to diagnose vertical velocities greatly overestimates the intensity of downward motion in the core for two reasons: neglect of the mass flux into the core through the swirling boundary layer, and the likely positive bias in low-level radial velocities due to the centrifuging of debris. Possible methods for accounting for these errors are briefly discussed.
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      On the Use of Doppler Radar–Derived Wind Fields to Diagnose the Secondary Circulations of Tornadoes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4219029
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    contributor authorNolan, David S.
    date accessioned2017-06-09T16:55:32Z
    date available2017-06-09T16:55:32Z
    date copyright2013/04/01
    date issued2012
    identifier issn0022-4928
    identifier otherams-76568.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219029
    description abstractnumber of studies in recent years have used wind fields derived from portable Doppler radars in combination with the ground-based velocity track display (GBVTD) technique to diagnose the primary (tangential) and secondary (radial and vertical) circulations in tornadoes. These analyses indicate very strong vertical motions in the vortex core, in some cases with updrafts and downdrafts exceeding 100 m s?1. In addition, many of the analyses indicate strong radial outflow at low levels and in the vicinity of the low-level tangential wind maximum. This paper shows that strong outward motion at this location cannot be consistent with a tornado circulation that lasts more than a few minutes. In addition, using data from numerical simulations as truth, it is shown that using observed radial velocities to diagnose vertical velocities greatly overestimates the intensity of downward motion in the core for two reasons: neglect of the mass flux into the core through the swirling boundary layer, and the likely positive bias in low-level radial velocities due to the centrifuging of debris. Possible methods for accounting for these errors are briefly discussed.
    publisherAmerican Meteorological Society
    titleOn the Use of Doppler Radar–Derived Wind Fields to Diagnose the Secondary Circulations of Tornadoes
    typeJournal Paper
    journal volume70
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-12-0200.1
    journal fristpage1160
    journal lastpage1171
    treeJournal of the Atmospheric Sciences:;2012:;Volume( 070 ):;issue: 004
    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