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    Possible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic Flows

    Source: Monthly Weather Review:;1997:;volume( 125 ):;issue: 006::page 1251
    Author:
    Knox, John A.
    DOI: 10.1175/1520-0493(1997)125<1251:PMOCAT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The forecasting of clear-air turbulence (CAT) continues to be a challenging problem despite progress made in the understanding of vertical shear (Kelvin?Helmholtz) instabilities. The possible connections between horizontal anticyclonic flows and CAT are addressed. Analytical expressions are derived to show that current CAT diagnostics do not correctly account for the dynamics of strongly anticyclonic situations. In gradient-balanced anticyclonic flows, nonfrontogenetical enhancement of vertical shear may lead to CAT. A review of observations, theory, and modeling is presented to support the claim that strong anticyclonic relative vorticity can also lead to CAT through the generation of gravity wave activity by geostrophic adjustment and inertial instability. CAT diagnostics are then discussed in light of these claims. Observational work is in progress to investigate the possibility of inertial instability-triggered CAT.
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      Possible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic Flows

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    contributor authorKnox, John A.
    date accessioned2017-06-09T16:11:19Z
    date available2017-06-09T16:11:19Z
    date copyright1997/06/01
    date issued1997
    identifier issn0027-0644
    identifier otherams-62907.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4203851
    description abstractThe forecasting of clear-air turbulence (CAT) continues to be a challenging problem despite progress made in the understanding of vertical shear (Kelvin?Helmholtz) instabilities. The possible connections between horizontal anticyclonic flows and CAT are addressed. Analytical expressions are derived to show that current CAT diagnostics do not correctly account for the dynamics of strongly anticyclonic situations. In gradient-balanced anticyclonic flows, nonfrontogenetical enhancement of vertical shear may lead to CAT. A review of observations, theory, and modeling is presented to support the claim that strong anticyclonic relative vorticity can also lead to CAT through the generation of gravity wave activity by geostrophic adjustment and inertial instability. CAT diagnostics are then discussed in light of these claims. Observational work is in progress to investigate the possibility of inertial instability-triggered CAT.
    publisherAmerican Meteorological Society
    titlePossible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic Flows
    typeJournal Paper
    journal volume125
    journal issue6
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1997)125<1251:PMOCAT>2.0.CO;2
    journal fristpage1251
    journal lastpage1259
    treeMonthly Weather Review:;1997:;volume( 125 ):;issue: 006
    contenttypeFulltext
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