Naslov
Mixing length-scale for inclined stable boundary layers

Autori
Grisogono, Branko ; Belušić, Danijel ; Enger, Leif

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
International Conference 'Mesoscale Meteorology and Air Pollution' - In Commemoration of the Late Professor Lev N. Gutman and His Outstanding Contribution to Theoretical Mesometeorology : Book of Abstracts / - , 2008

Skup
International Conference 'Mesoscale Meteorology and Air Pollution' - In Commemoration of the Late Professor Lev N. Gutman and His Outstanding Contribution to Theoretical Mesometeorology

Mjesto i datum
Odesa, Ukrajina, 15.09.2008. - 17.09.2008

Vrsta sudjelovanja
Plenarno

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Low-level jet; MIUU mesoscale model; Monin-Obukhov length; Prandtl model; turbulence; Temperature inversion;

Sažetak
It has been recognized for quite some time that current numerical mesoscale models often represent stable atmospheric boundary layers (SABL) poorly in terms of the SABL depth, near-surface inversion characteristics, low-level wind profiles and overall mixing properties. Since the SABL structures are far from being fully understood today, their parameterizations or explicit treatment are still usually very sketchy in most mesoscale and climate models. Typically an over- diffusion through the SABL occurs in most of numerical models. The mixing length-scale within the SABL, i.e. in the „ z-less“ regime, as often parameterized in mesoscale models with higher- order closure turbulence schemes, is addressed. We intend to improve this length-scale by including shear effects explicitly. With the “ z-less” mixing length-scale proposed here the over- diffusion is absent but sharp gradients still exist. Moreover, the mesoscale MIUU model used gave results similar to those from an improved Prandtl model (also addressed by L. Gutman), i.e. katabatic flow occupying the lower and more active part of the SABL developed in both models. The corresponding low-level jet (LLJ) that is imbedded in the strong near-surface inversion (NSI) appears similar in both models. Certain details about the corresponding LLJ and NSI vary simply because of very different nature of the models deployed. The results could be used in different types of numerical modelling, parameterizations of the SABL, further development of analytical models and data interpretation.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
Prof.dr.sc. Branko Grisogono bio je član međunarodnog programskog odbora konferencije, a pozvan je sa strane voditelja sekcije: Arakela Petrosyana i Sergeja Zilitinkevicha.

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