A modelling study using the OSU-CAPS model has been carried out in order to investigate the Nocturnal Boundary Layer (NBL) evolution during the wet season over the Amazon region to increase the existing knowledge about its dynamics under different environmental conditions. The model simulated the NBL depth (h i) and structure over 3 experimantal sites (RM, Forest and FNS) in Rondônia- RO, western Amazonian region, and these simulations have been compared to the observational. It was verified that the model has reasonably represented the NBL structure and evolution to the 3 sites. Simulations showed that RM (transiction forest-pasture) and the Forest sites have presented similar NBL development characteristics mainly for the period between 7 pm and 06 am. In the case of FNS (pasture) the analyses pointed out the NBL development to be similar to the one observed in urban areas - where a shalow mixing layer migth be watched close to the surface, in the evening.
numeric modelling; OSU-CAPS model; tethraed balloon
