Generation of Mesoscale Gravity Waves in Upper-Tropospheric Jet–Front SystemsSource: Journal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 004::page 440Author:Zhang, Fuqing
DOI: 10.1175/1520-0469(2004)061<0440:GOMGWI>2.0.CO;2Publisher: American Meteorological Society
Abstract: Multiply nested mesoscale numerical simulations with horizontal resolution up to 3.3 km are performed to study the generation of mesoscale gravity waves during the life cycle of idealized baroclinic jet?front systems. Long-lived vertically propagating mesoscale gravity waves with horizontal wavelengths ?100?200 km are simulated originating from the exit region of the upper-tropospheric jet streak, in a manner consistent with past observational studies. The residual of the nonlinear balance equation is found to be a useful index in diagnosing flow imbalance and predicting wave generation. The imbalance diagnosis and model simulations suggest that balance adjustment, as a generalization of geostrophic adjustment, is likely responsible for generating these mesoscale gravity waves. It is hypothesized that, through balance adjustment, the continuous generation of flow imbalance from the developing baroclinic wave will lead to the continuous radiation of gravity waves.
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contributor author | Zhang, Fuqing | |
date accessioned | 2017-06-09T14:38:36Z | |
date available | 2017-06-09T14:38:36Z | |
date copyright | 2004/02/01 | |
date issued | 2004 | |
identifier issn | 0022-4928 | |
identifier other | ams-23424.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4159984 | |
description abstract | Multiply nested mesoscale numerical simulations with horizontal resolution up to 3.3 km are performed to study the generation of mesoscale gravity waves during the life cycle of idealized baroclinic jet?front systems. Long-lived vertically propagating mesoscale gravity waves with horizontal wavelengths ?100?200 km are simulated originating from the exit region of the upper-tropospheric jet streak, in a manner consistent with past observational studies. The residual of the nonlinear balance equation is found to be a useful index in diagnosing flow imbalance and predicting wave generation. The imbalance diagnosis and model simulations suggest that balance adjustment, as a generalization of geostrophic adjustment, is likely responsible for generating these mesoscale gravity waves. It is hypothesized that, through balance adjustment, the continuous generation of flow imbalance from the developing baroclinic wave will lead to the continuous radiation of gravity waves. | |
publisher | American Meteorological Society | |
title | Generation of Mesoscale Gravity Waves in Upper-Tropospheric Jet–Front Systems | |
type | Journal Paper | |
journal volume | 61 | |
journal issue | 4 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/1520-0469(2004)061<0440:GOMGWI>2.0.CO;2 | |
journal fristpage | 440 | |
journal lastpage | 457 | |
tree | Journal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 004 | |
contenttype | Fulltext |