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The effect of baroclinicity on the equilibrium depth of neutral and stable planetary boundary layers
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2003 (English)In: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 129, no 595, 3339-3356 p.Article in journal (Refereed) Published
Abstract [en]

Earlier studies of the depths of the geophysical planetary boundary layers (PBLs) basically focused on the effects of the earth's rotation and density stratification. One more inherent feature of geophysical flows, namely their baroclinicity, has not been considered in that context. The present paper makes up for this deficiency. Diagnostic equations for the depths of the equilibrium, baroclinic, neutral or stable PBLs are derived and verified against data from large-eddy simulations (LES). These latter represents the most convenient empirical-validation tool, which allows considering separately different types of PBL: barotropic and baroclinic; truly neutral and conventionally neutral; nocturnal stable and long-lived stable. The LES are performed using a new code specifically designed for modelling the neutral and stable PBL. Results from the comparison show an excellent correspondence between the proposed equations and LES data. Copyright © 2003 Royal Meteorological Society

Place, publisher, year, edition, pages
2003. Vol. 129, no 595, 3339-3356 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90149DOI: 10.1256/qj.02.94OAI: oai:DiVA.org:uu-90149DiVA: diva2:162388
Available from: 2003-02-19 Created: 2003-02-19 Last updated: 2013-05-17Bibliographically approved
In thesis
1. Large Eddy Simulation of Non-Local Turbulence and Integral Measures of Atmospheric Boundary Layers
Open this publication in new window or tab >>Large Eddy Simulation of Non-Local Turbulence and Integral Measures of Atmospheric Boundary Layers
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A new large eddy simulation (LES) code is developed and used to investigate non-local features of turbulent planetary boundary layers (PBLs). The LES code is based on filtered Navier-Stokes equations, which describe motions of incompressible, Boussinesq fluid at high Reynolds numbers. The code computes directly large-scale, non-universal turbulence in the PBL whereas small-scale, universal turbulence is parameterized by a dynamic mixed subgrid closure. The LES code is thoroughly tested against high quality laboratory and field data.

This study addresses non-local properties of turbulence which emphasis on the stable stratification. Its basic results are as follows. The flow stability in PBLs is generally caused by two mechanisms: the negative buoyancy force (in the stable density stratification) and the Coriolis force (in the rotating system). The latter stabilizes the flow if the earth’s vorticity and the turbulent vorticity are anti-parallel. The Coriolis force stability suppresses large-scale turbulence and makes large eddies asymmetric. The density stratification suppresses vertical scales of turbulence. Joint actions of the Coriolis and the buoyancy forces result in a more complex behavior of turbulence. Particularly, the layers of vigorous turbulence may appear in the course of development of low-level jets in baroclinic atmosphere.

Non-local effects determine integral measures of PBLs, first of all the PBL depth. This study clearly demonstrates its pronounced dependences on the Coriolis parameter, the Kazanski-Monin internal stability parameter, and newly introduced imposed-stability and baroclinicity parameters. An LES database is created and used to validate an advanced PBL-depth formulation. LES support the idea that PBLs interact with the stably stratified free flow through the radiation of gravity waves, excited by large turbulent eddies at the interface.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 30 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 800
Keyword
Meteorology, Planetary boundary layers, large eddy simulations, non-local turbulence, Meteorologi
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:uu:diva-3321 (URN)91-554-5519-0 (ISBN)
Public defence
2003-03-24, Axel Hambergsalen, Geocentrum, Uppsala, 10:00
Opponent
Available from: 2003-02-19 Created: 2003-02-19Bibliographically approved

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