The investigation of the evening transition and the stably stratified atmosphere with LES is in general very challenging, and there have been few studies related to this topic (Nieuwstadt and Brost, 1986; Sorbjan, 1997; Goulart et al. 2010). The principal aim of this work is to investigate the effects of the baroclinic setup in the LES study of a sunset PBL. The baroclinicity is related to temperature gradients through the well-known “thermal wind” equations and consequently it would require the adaptation of model equations in order to incorporate the thermal advection, with adjustment for the effects of buoyancy (Sorbjan, 2004).
