Possible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic FlowsSource: Monthly Weather Review:;1997:;volume( 125 ):;issue: 006::page 1251Author:Knox, John A.
DOI: 10.1175/1520-0493(1997)125<1251:PMOCAT>2.0.CO;2Publisher: 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.
|
Collections
Show full item record
contributor author | Knox, John A. | |
date accessioned | 2017-06-09T16:11:19Z | |
date available | 2017-06-09T16:11:19Z | |
date copyright | 1997/06/01 | |
date issued | 1997 | |
identifier issn | 0027-0644 | |
identifier other | ams-62907.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4203851 | |
description 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. | |
publisher | American Meteorological Society | |
title | Possible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic Flows | |
type | Journal Paper | |
journal volume | 125 | |
journal issue | 6 | |
journal title | Monthly Weather Review | |
identifier doi | 10.1175/1520-0493(1997)125<1251:PMOCAT>2.0.CO;2 | |
journal fristpage | 1251 | |
journal lastpage | 1259 | |
tree | Monthly Weather Review:;1997:;volume( 125 ):;issue: 006 | |
contenttype | Fulltext |