Author(s)

A.P. de Oliveira, G.A. Degrazia, O.L.L. Moraes & T. Tirabassi

Abstract

A second order closure model is used to simulate the nighttime evolution of a Planetary Boundary Layer (PEL) over a continental area located in Ipero, Brazil,(23°25' S,47<>35' W). The numerical results show that the observed southerly nocturnal low level jet can be explained in terms of the meso-scale circulation induced by the slopped terrain. Two numerical simulation of the PEL was carried out using different mixing length expressions. One, based on the original master length scale proposed by Mellor & Yamada [1] and, another using a new length scale proposed by Degrazia et al.[2], where the thermal stratification effect is explicitly include in mixing length. The results indicate that the mean field structure and the intensity of turbulence vary with different choice of

Keywords