Naslov
The low-level katabatic jet height versus Monin-Obukhov height

Autori
Grisogono, Branko ; Kraljević, Lukša ; Jeričević, Amela

Izvornik
Quarterly Journal of the Royal Meteorological Society (0035-9009) 133 (2007), 629; 2133-2136

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
stable ABL; drainage flows; katabatic wind; Prandtl model; scaling

Sažetak
In this short note we discuss a long-standing problem in modelling the atmospheric boundary layer (ABL) over complex terrain: namely, an excessive use of the Monin-Obukhov length scale LMO. This issue becomes increasingly relevant with the ever-increasing resolution of numerical weather-prediction and climate models, which typically use LMO in one way or another for parametrizing the surface layer, or at least for formulating the lower boundary conditions. Hence, inevitably, the models under-represent a significant part of the mesoscale flow variability. We focus here on the stable ABL over land: in particular, sloped cooled flows. However, a qualitatively similar reasoning applies to the corresponding unstable ABL. We show that for sufficiently stratified flows over moderately sloped surfaces, Monin-Obukhov scaling is inadequate for describing the basic ABL dynamics, which is often governed by katabatic and drainage flows.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
Projekti BORA, EMEM4HR (bilateralni norveško-hrvatski)

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