On the Pressure Field in the Slope Wind Layer

Haiden, Thomas

doi:10.1175/1520-0469(2003)60<1632:otpfit>2.0.co;2

Cited by 27 publications

(22 citation statements)

References 9 publications

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“…From the pointwise perspective, the basic physics of fluid flow over a heated or cooled slope is described by the 1942 Prandtl model [87][88][89]. This is a closed-form solution of the Navier-Stokes equations, providing slope-normal profiles of equilibrium laminar flow over homogeneous slopes.…”

Section: Pointwise Perspective On Upslope Windsmentioning

confidence: 99%

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

et al. 2018

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Abstract:The exchange of heat, momentum, and mass in the atmosphere over mountainous terrain is controlled by synoptic-scale dynamics, thermally driven mesoscale circulations, and turbulence. This article reviews the key challenges relevant to the understanding of exchange processes in the mountain boundary layer and outlines possible research priorities for the future. The review describes the limitations of the experimental study of turbulent exchange over complex terrain, the impact of slope and valley breezes on the structure of the convective boundary layer, and the role of intermittent mixing and wave-turbulence interaction in the stable boundary layer. The interplay between exchange processes at different spatial scales is discussed in depth, emphasizing the role of elevated and ground-based stable layers in controlling multi-scale interactions in the atmosphere over and near mountains. Implications of the current understanding of exchange processes over mountains towards the improvement of numerical weather prediction and climate models are discussed, considering in particular the representation of surface boundary conditions, the parameterization of sub-grid-scale exchange, and the development of stochastic perturbation schemes.

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Section: Pointwise Perspective On Upslope Windsmentioning

confidence: 99%

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

et al. 2018

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“…As well as the development of a deep convective boundary layer over the surrounding flat terrain, heating of the mountain slopes leads to a net buoyancy force, driving socalled anabatic upslope winds (Haiden, 2003;Mahrt, 1982). Weigel et al (2006) documented a case where vertical exchange was enhanced by a factor of three compared with flat terrain.…”

Section: Introductionmentioning

confidence: 99%

Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch

et al. 2014

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Abstract. Atmospheric composition measurements at Jungfraujoch are affected intermittently by boundary-layer air which is brought to the station by processes including thermally driven (anabatic) mountain winds. Using observations of radon-222, and a new objective analysis method, we quantify the land-surface influence at Jungfraujoch hour by hour and detect the presence of anabatic winds on a daily basis. During 2010-2011, anabatic winds occurred on 40 % of days, but only from April to September. Anabatic wind days were associated with warmer air temperatures over a large fraction of Europe and with a shift in air-mass properties, even when comparing days with a similar mean radon concentration. Excluding days with anabatic winds, however, did not lead to a better definition of the unperturbed aerosol background than a definition based on radon alone. This implies that a radon threshold reliably excludes local influences from both anabatic and non-anabatic vertical-transport processes.

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“…At the smallest scale, slope winds respond to temperature differences between the air heated or cooled by a slope and undisturbed air at the same level (Prandtl 1952;Schumann 1990;Haiden 2003). At a larger scale, valley winds are generated by thermal imbalances between the core of the valley volume and the atmosphere above a nearby plain.…”

Section: Introductionmentioning

confidence: 99%

Daytime Heat Transfer Processes Related to Slope Flows and Turbulent Convection in an Idealized Mountain Valley

Serafin

Zardi

2010

Journal of the Atmospheric Sciences

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The mechanisms governing the daytime development of thermally driven circulations along the transverse axis of idealized two-dimensional valleys are investigated by means of large-eddy simulations. In particular, the impact of slope winds and turbulent convection on the heat transfer from the vicinity of the ground surface to the core of the valley atmosphere is examined. The interaction between top-down heating produced by compensating subsidence in the valley core and bottom-up heating due to turbulent convection is described. Finally, an evaluation of the depth of the atmospheric layer affected by the slope wind system is provided.

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On the Pressure Field in the Slope Wind Layer

Cited by 27 publications

References 9 publications

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch

Daytime Heat Transfer Processes Related to Slope Flows and Turbulent Convection in an Idealized Mountain Valley

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