Describing surface fluxes in katabatic flow on Breidamerkurjökull, Iceland
نویسندگان
چکیده
منابع مشابه
Idealized Simulations of Katabatic Flows in Iceland: Katabatic Winds or Land Breeze?
Local thermal flows may be organized where there is a local horizontal pressure gradient due to differential surface heating or cooling. According to a simple conceptual model of katabatic flows (e.g. Egger 1990), they develop in sloping topography where the air at the surface cools relative to the air aloft, e.g. due to radiative cooling on clear nights. The cold and heavy air flows downslope ...
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Buoyancy inhomogeneities on sloping surfaces arise in numerous situations, for example, from variations in snow/ice cover, cloud cover, topographic shading, soil moisture, vegetation type, and land use. In this paper, the classical Prandtl model for one-dimensional flow of a viscous stably stratified fluid along a uniformly cooled sloping planar surface is extended to include the simplest type ...
متن کاملAnalytical and Numerical Investigation of Two-Dimensional Katabatic Flow Resulting from Local Surface Cooling
The analysis of katabatic flows is often complicated by heterogeneity in surface characteristics. This study focuses on an idealized type of katabatic flow driven by a simple form of inhomogeneous surface forcing: a buoyancy or buoyancy flux that varies down the slope as a top-hat profile (cold strip). We consider the two-dimensional Boussinesq system of governing flow equations with the slope ...
متن کاملA Boundary-Layer Scaling for Turbulent Katabatic Flow
Scaling relationships are proposed for the turbulent katabatic flow of a stably stratified fluid down a homogeneously cooled planar slope—the turbulent analogue of a Prandtl-type slope flow. The Theorem predicts that such flows are controlled by three nondimensional parameters: the slope angle, the Prandtl number, and a Reynolds number defined in terms of the surface thermal forcing (surface bu...
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The katabatic wind system over the Greenland ice sheet is studied using simulations of the hydrostatic Norwegian Limited Area Model (NORLAM) and measurements of an instrumented aircraft. The structure and the dynamics of the katabatic wind over the ice sheet are investigated for a case study of the aircraft-based experiment KABEG (Katabatic wind and boundary layer front experiment around Greenl...
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ژورنال
عنوان ژورنال: Quarterly Journal of the Royal Meteorological Society
سال: 2004
ISSN: 0035-9009,1477-870X
DOI: 10.1256/qj.03.52