Analytical Surface Pressure and Drag for Linear Hydrostatic Flow over Three-Dimensional Elliptical Mountains

Phillips, Doug S.

doi:10.1175/1520-0469(1984)041<1073:aspadf>2.0.co;2

Cited by 92 publications

(90 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the total amount of momentum transported vertically by the waves depends on the wind direction relative to the orientation of the unresolved topography in each AGCM grid cell. This is accomplished by characterizing the sub-grid topography by a variable number of identical ellipses and using the linear theory derived by Phillips (1984) to determine pressure drag associated with the 3-D wave field.…”

Section: Orographic Dragmentioning

confidence: 99%

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

et al. 2008

View full text Add to dashboard Cite

Abstract. The Canadian Centre for Climate Modelling and Analysis third generation atmospheric general circulation model (AGCM3) is described. The discussion summarizes the details of the complete physics package emphasizing the changes made relative to the second generation version of the model. AGCM3 is the underlying model for applications which include the IPCC fourth assessment, coupled atmosphere-ocean seasonal forecasting, the first generation of the CCCma earth system model (CanESM1), and middleatmosphere chemistry-climate modelling (CCM). Here we shall focus on issues related to an upwardly extended version of AGCM3, the Canadian Middle-Atmosphere Model (CMAM). The CCM version of CMAM participated in the 2006 WMO/UNEP Scientific Assessment of Ozone Depletion and issues concerning its climate such as the impact of gravity-wave drag, the modelling of a spontaneous QBO, and the seasonality of the breakdown of the Southern Hemisphere polar vortex are discussed here.

show abstract

Section: Orographic Dragmentioning

confidence: 99%

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

et al. 2008

View full text Add to dashboard Cite

show abstract

“…The present study has shown that the drag due to internal Rossby-gravity waves existing in a stably stratified westerly flow is not only much larger than the equivalent inertia-gravity wave drag (Smith, 1979a;Ólafsson and Bougeault, 1997), but also larger than the equivalent pure gravity wave drag (Phillips, 1984). Additionally, it is typically comparable with the barotropic wave drag existing in a neutral but vertically bounded atmosphere (Janowitz, 1977).…”

Section: Discussionmentioning

confidence: 99%

“…Phillips, 1984;Ólafsson and Bougeault, 1997;Teixeira and Miranda, 2006). For simplicity, the main axes of the ellipse are assumed to be aligned in the zonal (x) and meridional (y) directions.…”

Section: The Vertical Structure Equationmentioning

confidence: 99%

See 1 more Smart Citation

Internal wave drag in stratified flow over mountains on a beta plane

Teixeira

Grisogono

2008

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

ABSTRACT:The impact of the variation of the Coriolis parameter f on the drag exerted by internal Rossby-gravity waves on elliptical mountains is evaluated using linear theory, assuming constant wind and static stability and a beta-plane approximation. Previous calculations of inertia-gravity wave drag are thus extended in an attempt to establish a connection with existing studies on planetary wave drag, developed primarily for fluids topped by a rigid lid. It is found that the internal wave drag for zonal westerly flow strongly increases relative to that given by the calculation where f is assumed to be a constant, particularly at high latitudes and for mountains aligned meridionally. Drag increases with mountain width for sufficiently wide mountains, reaching values much larger than those valid in the non-rotating limit. This occurs because the drag receives contributions from a low wavenumber range, controlled by the beta effect, which accounts for the drag amplification found here. This drag amplification is shown to be considerable for idealized analogues of real mountain ranges, such as the Himalayas and the Rocky mountains, and comparable to the barotropic Rossby wave drag addressed in previous studies.

show abstract

“…The three dimensional linear models for uniform flow over an isolated obstacle were originally provided by Wurtele (1957) [14], Crapper (1959Crapper ( , 1962 [15] [16], and Janowitz (1984) [17] for non-hydrostatic flows and by Smith (1980Smith ( , 1988Smith ( , 1989 [18]- [20] and Phillips (1984) [21] for hydrostatic flows. Crapper (1962) [16], Sharman and Wurtele (1983) [22], Gjevik and Marthinsen (1978) [23], and GrubiŠić and Smolarkiewicz (1997) [24] examined the effect of vertical variations in wind speed and stability of the environment.…”

Section: Introductionmentioning

confidence: 99%

Analyses and Numerical Modeling of Gravity Waves Generated by Flow over Nanling Mountains

Li¹,

Zhou²

2014

ACS

View full text Add to dashboard Cite

Although there have been many observational and modeling studies of gravity waves excited by topograpghy, the detailed structure and its changes in real world are still poorly understood. The interaction of topography and background flow are described in details for a better understanding of the gravity waves observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite imagery over Nanling Mountains. The evolutionary process and spatial structure of gravity waves were investigated by using almost all available observational data, including MODIS satellite imagery, the Final Analyses (FNL) data issued by National Centers for Environmental Prediction (NCEP), the aerosol backscattering signal data from Lidar, the surface observational data and the sounding data of Nanling mountain regions. In order to study its development mechanism, choosing the initial sounding of Jiangxi Gaizhou station located in the upstream of Nanling regions, and using the Advanced Regional Prediction System (ARPS), the numerical simulation was performed. It is shown that the ARPS model reproduced the main features of gravity waves reasonably well, where the gravity waves and turbulent mixed layer are consistent with the satellite image and the aerosol backscattering signal from Lidar observation. It is well-known that gravity wave-induced turbulence and thus turbulent mixing could affect the local composition of chemical species, which plays a significant role in the formation of low visibility and precipitation associated with local orography.

show abstract

Analytical Surface Pressure and Drag for Linear Hydrostatic Flow over Three-Dimensional Elliptical Mountains

Cited by 92 publications

References 0 publications

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

Internal wave drag in stratified flow over mountains on a beta plane

Analyses and Numerical Modeling of Gravity Waves Generated by Flow over Nanling Mountains

Contact Info

Product

Resources

About