The Response of a Hemispheric Multi-Level Model Atmosphere to Forcing by Topography and Stationary Heat Sources (I) Forcing by Topography

Huang, Ronghui; Gambo, K.

doi:10.2151/jmsj1965.60.1_78

Cited by 32 publications

(17 citation statements)

References 19 publications

(8 reference statements)

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“…This theory also suggests that large-scale waves (zonal wave number = 1, 2, 3) are more likely to propagate upwards because their associated critical wind speeds are higher. Studies by Matsuno (1970), Lin (1982), Huang and Gambo (2002), Limpasuvan and Hartmann (2000), Hu and Tung (2002), and Dickinson (1969) not only confirmed this theory but also stressed the importance of vertical shear of the zonal mean zonal wind as well as the vertical gradient of the buoyancy frequency for vertical propagation of large-scale waves. Matsuno (1970) introduced the refractive index for stationary planetary waves (or alternatively vertical wave number) as a diagnostic tool for studying the influence of the background zonal flow on planetary wave propagation.…”

Section: Introductionmentioning

confidence: 69%

On the climatological probability of the vertical propagation of stationary planetary waves

et al. 2016

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Abstract. We introduce a diagnostic tool to assess a climatological framework of the optimal propagation conditions for stationary planetary waves. Analyzing 50 winters using NCEP/NCAR (National Center for Environmental Prediction/National Center for Atmospheric Research) reanalysis data we derive probability density functions (PDFs) of positive vertical wave number as a function of zonal and meridional wave numbers. We contrast this quantity with classical climatological means of the vertical wave number. Introducing a membership value function (MVF) based on fuzzy logic, we objectively generate a modified set of PDFs (mPDFs) and demonstrate their superior performance compared to the climatological mean of vertical wave number and the original PDFs. We argue that mPDFs allow an even better understanding of how background conditions impact wave propagation in a climatological sense. As expected, probabilities are decreasing with increasing zonal wave numbers. In addition we discuss the meridional wave number dependency of the PDFs which is usually neglected, highlighting the contribution of meridional wave numbers 2 and 3 in the stratosphere. We also describe how mPDFs change in response to strong vortex regime (SVR) and weak vortex regime (WVR) conditions, with increased probabilities of the wave propagation during WVR than SVR in the stratosphere. We conclude that the mPDFs are a convenient way to summarize climatological information about planetary wave propagation in reanalysis and climate model data.

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Section: Introductionmentioning

confidence: 69%

On the climatological probability of the vertical propagation of stationary planetary waves

et al. 2016

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“…The buoyancy frequency represents the stability of atmosphere. In some other studies, the buoyancy frequency was treated as a constant (Matsuno, 1970;Huang and Gambo, 1982;Andrews et al, 1987), or as a variable of altitudes only (Chen and Robinson, 1992;Limpasuvan and Harmann, 2000;Hu and Tung, 2002). Chen and Robinson (1992) found that the variation of N 2 is not as negligible as it has been hypothesized in other applications (Matsuno, 1970;Andrews et al, 1987).…”

Section: Boreal Wintermentioning

confidence: 99%

“…After the theoretical study of Charney and Drazin (1961), the refractive index of stationary planetary waves was firstly introduced as a diagnostic tool by Matsuno (1970) and has frequently been applied by a number of researchers thereafter (Lin, 1982;Huang and Gambo, 1982;Hu and Tung, 2002;Mukougawa and Hirootka, 2004;etc. ) to investigate planetary wave propagation.…”

Section: Q LI Et Al: Climatology Of Stationary Planetary Waves In Nmentioning

confidence: 99%

Stationary planetary wave propagation in Northern Hemisphere winter – climatological analysis of the refractive index

Graf

Giorgetta

2007

Atmos. Chem. Phys.

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Abstract. The probability density on a height-meridional plane of negative refractive index squared f (n 2 k <0) is introduced as a new analysis tool to investigate the climatology of the propagation conditions of stationary planetary waves based on NCEP/NCAR reanalysis data for 44 Northern Hemisphere boreal winters . This analysis addresses the control of the atmospheric state on planetary wave propagation. It is found that not only the variability of atmospheric stability with altitudes, but also the variability with latitudes has significant influence on planetary wave propagation. Eliassen-Palm flux and divergence are also analyzed to investigate the eddy activities and forcing on zonal mean flow. Only the ultra-long planetary waves with zonal wave number 1, 2 and 3 are investigated. In Northern Hemisphere winter the atmosphere shows a large possibility for stationary planetary waves to propagate from the troposphere to the stratosphere. On the other hand, waves induce eddy momentum flux in the subtropical troposphere and eddy heat flux in the subpolar stratosphere. Waves also exert eddy momentum forcing on the mean flow in the troposphere and stratosphere at middle and high latitudes. A similar analysis is also performed for stratospheric strong and weak polar vortex regimes, respectively. Anomalies of stratospheric circulation affect planetary wave propagation and waves also play an important role in constructing and maintaining of interannual variations of stratospheric circulation.

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“…In Part I of this paper (Huang and Gambo, 1982), a quasi-geostrophic, steady-state 34-level model with Rayleigh friction, Newtonian cooling effect and horizontal kinematic thermal diffusivity included in a spherical coordinate system was used to examine the standing waves responding to forcing by the Hemispheric topography in winter. In this paper, however, we discuss the standing waves responding to forcing by the Hemispheric topography and the stationary heat sources in winter.…”

Section: Introductionmentioning

confidence: 99%