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Grey-Zone Turbulence in the Neutral Atmospheric Boundary Layer
- Source :
- Boundary-Layer Meteorology, Boundary-Layer Meteorology, Springer Verlag, 2019, 170 (2), pp.191-204. ⟨10.1007/s10546-018-0394-y⟩, Boundary-Layer Meteorology, 2019, 170 (2), pp.191-204. ⟨10.1007/s10546-018-0394-y⟩
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- The turbulence generated by wind shear is described at grey-zone resolutions using a theoretical neutral boundary layer based on atmospheric conditions constructed from measurements from the CASES-99 field campaign. Six-metre-resolution large-eddy simulations (LES) are performed to access the “true” resolved turbulence for two cases, corresponding to a forcing of the boundary layer by zonal geostrophic wind speeds of $$10\,\text {m}\,\text {s}^{-1}$$ and $$20\,\text {m}\,\text {s}^{-1}$$ . The LES fields are subject to a coarse-graining procedure in order to compute turbulence diagnostics in the grey zone, with the robustness and weakness of various averaging procedures tested, for which simple top-hat averaging is found to be both suitable and accurate. In addition, the “true” resolved and subgrid-scale fluxes, variances, turbulent kinetic energy and production terms are quantified on various scales. The grey zone of turbulence is defined as the range of scales where 10–90% of turbulence is resolved, which here ranges from resolutions of 25– $$800\,\hbox {m}$$ ( $$0.031$$ ). The turbulence parametrizations, which are tested in the Meso-NH model by running simulations at resolutions from the LES scale to the mesoscale, fail to produce the correct turbulence regardless of resolution.
- Subjects :
- Physics
Atmospheric Science
010504 meteorology & atmospheric sciences
Turbulence
Planetary boundary layer
Order (ring theory)
Geometry
01 natural sciences
Grey-zone turbulence
Physics::Fluid Dynamics
Boundary layer
Large-eddy simulation
[SDU]Sciences of the Universe [physics]
Wind shear
Turbulence kinetic energy
Production (computer science)
Neutral boundary layer
Physics::Atmospheric and Oceanic Physics
Geostrophic wind
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15731472 and 00068314
- Volume :
- 170
- Database :
- OpenAIRE
- Journal :
- Boundary-Layer Meteorology
- Accession number :
- edsair.doi.dedup.....abe303a85b847a066b877da53165e1df