Naslov
Generalizing the local mixing length-scale for stable atmospheric boundary layers

Autori
Grisogono, Branko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
30th International Conference on Alpine Meteorology - Programme & Extended Abstracts. Deutscher Wetterdienst: Annalen der Meteorologie, 44. / Volkert, Hans - Offenbach : Deutscher Wetterdienst, 2009, 34-35

ISBN
978-3-88148-440-4

Skup
30th International Conference on Alpine Meteorology

Mjesto i datum
Rastatt, Njemačka, 11.05.2009. - 15.05.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ICAM; katabatic flow; modeling; parameterization; Prandtl; Richardson number; strongly stratified turbulence

Sažetak
Excessively diffusive and much-too-deep modeled stable ABL flow is remedied by using a new generalized „ zless“ mixing length-scale, Λ , including the vertical wind shear, S explicitly. This generalization of Λ is based on a simplified turbulent kinetic energy (TKE) eqn. yielding Λ ~ (TKE)1/2/|S|, almost regardless of other parameterization details. The proportionality depends on known model constants and a function of Ri and turbulent Prandtl number, Pr ; Λ approaches Ozmidov scale (determined by the turbulent dissipation and buoyancy frequency) in the limit Ri >> 1. Tests with mesoscale MIUU model and a calibrated 1D semi-analytic Prandtl model prove this generalization of Λ correct and useful.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA