Estimation of Surface-Layer Scaling Parameters in the Unstable Boundary Layer: Implications for Orographic Flow Speed-Up

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Argain, JL (Autor) Outra; Teixeira, MAC (Autor) Outra; Miranda, PMA (Autor) Outra

Revista

Título: Boundary-Layer Meteorology

Vol. 165

Páginas: 145-160

ISSN: 0006-8314

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-00N-1B2

DOI: 10.1007/s10546-017-0260-3

Abstract (EN): A method is proposed for estimating the surface-layer depth and the friction velocity as a function of stability (here quantified by the Obukhov length, L) over the complete range of unstable flow regimes. This method extends that developed previously for stable conditions by Argain et al. (Boundary-Layer Meteorol 130:15-28, 2009), but uses a qualitatively different approach. The method is specifically used to calculate the fractional speed-up in flow over a ridge, although it is suitable for more general boundary-layer applications. The behaviour of and as a function of L is indirectly assessed via calculation of using the linear model of Hunt et al. (Q J R Meteorol Soc 29:16-26, 1988) and its comparison with the field measurements reported in Coppin et al. (Boundary-Layer Meteorol 69:173-199, 1994) and with numerical simulations carried out using a non-linear numerical model, FLEX. The behaviour of estimated from the linear model is clearly improved when is calculated using the method proposed here, confirming the importance of accounting for the dependences of and on L to better represent processes in the unstable boundary layer.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16