Parameterization of mesoscale stationary orographic wave forcing for use in numerical models of atmospheric dynamics

Гаврилов, Н. М.; Koval, A. V.

doi:10.1134/s0001433813030067

Cited by 36 publications

(37 citation statements)

References 11 publications

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“…AGW polarization relations show that the amplitude U of velocity variations v k along axis x k parallel to horizontal wave vector k is much larger than the amplitude V of velocity fluctuations in the perpendicular direction. In this case, Gavrilov and Koval (2013) obtained the following expressions for total vertical wave energy flux F E , for wave acceleration a wk along axis x k , and for total heating rate ε w produced by stationary OGWs:…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we use the parameterization of dynamical and thermal effects of stationary OGWs described in detail by Gavrilov and Koval (2013). To calculate vertical profiles of total vertical wave energy flux and associated accelerations of horizontal components of wind by stationary OGWs with ground-based observed frequencies σ = 0, we used wave polarization relations taking into account the rotation of the atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…where N is the Brunt-Väisälä frequency; ν and K z are the kinematic coefficients of molecular and turbulent viscosity, respectively; δ is a factor depending on the vertical gradients of the mean wind (see Gavrilov and Koval 2013); and Pr is the effective Prandtl number. When δ = 1, the expression for ε w in Eq.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, Gavrilov and Koval (2013) developed a new parameterization of dynamical and thermal effects of OGWs generated by the surface topography and propagating into the middle and upper atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

et al. 2015

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Recently developed parameterization of stationary orographic gravity waves (OGWs) generated by the Earth's topography was implemented into a general circulation model of the middle and upper atmosphere. We performed numerical simulations of the zonal mean wind and amplitudes of stationary planetary waves and normal atmospheric modes with periods of 4-16 days at altitudes from the troposphere to the lower thermosphere in January for easterly and westerly phases of the quasi-biennial oscillation (QBO) including and excluding the stationary OGW parameterization. Simulations show that accounting dynamical and thermal effects of stationary OGWs can lead to substantial changes (up to 50-90 %) in the amplitudes of stationary planetary waves. Amplitudes of westward travelling normal atmospheric modes change (up to 50-90 %) at different altitudes and latitudes of the northern hemisphere due to OGW effects. Transitions from the easterly to westerly QBO phases can change planetary wave amplitudes up to ±30-90 % at middle and high latitudes. These changes in PW amplitudes are consistent with distributions of EP-flux and refractive index under different QBO phases simulated including our parameterization of stationary OGWs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

et al. 2015

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“…where the dimensionless parameters are: waves at altitudes of 8090 km over mountain [9], and temperature disturbances from a tsunami (increasing by 1012 K [35], wave periods are ∼ 30 min [2]), and also are in good correspondence by order of magnitude to experimental estimations [1,13,32,33,34,38,41].…”

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confidence: 88%

Temperature changes over storms from measurements of spacecraft TIMED

Pylypenko

Motsyk

Kozak

2016

Adv.Astron.Spa.Physics

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In the present work we have studied changes of mesospheric temperature over the powerful storms Wilma, Haitang, and Katrina using measurements of the space vehicle TIMED. We have found the temperature increasing at the altitude range 80100 km. We have found the explanations for the obtained results by the dissipation of the gravity waves. Propagation of atmospheric gravity waves in a non-isothermal, windless atmosphere, with taking into account the viscosity and the thermal conductivity, has also been modelled in this work. We have determined that the maximum of amplitude of the atmospheric-gravity waves at the considered characteristics corresponds to altitudes of near 90 km (mesopause). It was found that the main factor inuencing propagation and dissipation of the wave in such cases is the vertical temperature gradient. Viscosity and thermal conductivity have less inuence on the wave amplitude.

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