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Assessment of Monin-Obukhov scaling over small slopes. (CROSBI ID 154755)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Grisogono, Branko ; Zovko Rajak, Dragana Assessment of Monin-Obukhov scaling over small slopes. // Geofizika, 26 (2009), 1; 101-108

Podaci o odgovornosti

Grisogono, Branko ; Zovko Rajak, Dragana

engleski

Assessment of Monin-Obukhov scaling over small slopes.

In this note we combine two recent findings related to sloped stably-stratified boundary layers (SBL). One of them contrasts Monin-Obukhov height, L, and the low-level jet (LLJ) height, zj, induced by simple katabatic flows. Another result connects turbulent Prandtl number, Pr, to gradient Richardson number, Ri. In this way, one finds the ratio of the two heights (L/zj) as a single value function of the underlying slope and Ri, thus giving a criterion where L may not be the most relevant near-surface layer scaling parameter for turbulent processes. For (L/zj) > 1 it is the LLJ which determines most of near-surface turbulent properties. This has significant consequences on properties of various near-surface fluxes as treated in NWP, air-chemistry and wind-energy exploring models because most of them deploy L in one or another way for describing the lower boundary condition. This note shows that for ever finer horizontal resolution in our models, L should accommodate slope effects on the near-surface turbulent fluxes.

diffusion; parameterization; Prandtl number; gradient Richardson number; stably-stratified turbulence; very stable boundary layers.

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Podaci o izdanju

26 (1)

2009.

101-108

objavljeno

0352-3659

Povezanost rada

Geologija

Indeksiranost