Implementação de um modelo de coluna simples para a camada limite estável utilizando diferentes formulações de turbulência

Abstract

In this work a single column model is implemented, aiming primarily to simulate the Stable Boundary Layer (SBL). The model is composed of prognostic equations for the potential temperature, specific humidity and the wind components. A prognostic equation for the turbulent kinetic energy (TKE) is also used. The turbulent fluxes are approximated from diffusion coefficients that are directly proportional to TKE and to the turbulent mixing length, with a adjustable proportionality factor. To estimate the turbulent mixing lengths, four different parametrizations from the literature are considered. First, a stable case in the Arctic is simulated, then the model is adjusted to reproduce previously published Large Eddy Simulations (LES) results for the same case. After the calibration, the model is validated through a comparison with observed nocturnal data, from tethered balloon soundings performed at a deforested area in the Amazon region, in the months of July and October 2001 and November 2003. The temporal evolution of potential temperature and specific humidity vertical profiles are simulated and compared to the observations from 13 different nights. The performance of the different formulations is evaluated through a statistic analysis for all nights. Potential temperature profiles were better represented by the model than specific humidity ones. In spite being able to reproduce different stability conditions, the model represented the most stable nights better. Finally, the model was coupled to a surface energy budget scheme and for these simulations the initial conditions from the night of 28 July 2001 were used. The scheme was used to evaluate how the simulated atmospheric variables depend on the wind intensity at the top of the vertical domain for the different formulations and with or without the energy budget scheme being added.