Estudo da variabilidade e comparação dos métodos de estimativa da camada limite atmosférica na Amazônia Central.

Abstract

This work makes a study of the planetary boundary layer variability and compare its estimation methods in the Amazonia centre region, through the observational data from the GOAmazon 2014/15 Project. This research is precursor in terms of using a so long record series. The obtained results showed that the Convective Boundary Layer (CBL) has a huge variability all year round, reaching, in the rainy season, an average height of 838,5 m, while in the dry period, the average height was 1833,8 m. In other words, a difference around 1000m . The heights found for the Nocturnal Boundary Layer (NBL) did not obtain a seasonality as in CBL. Among all methods used in this analysis, the ceilometer was the method that was closer from the values found by the profile method in the CBL. The determination coefficient was higher in the dry period (R2 = 0.835) because, during clear sky or low cloudiness days, the instrument estimates more efficiently the top of the CBL. The other methods overestimated the top of the CBL with an average difference of 650 m. The NBL presented the worst results, both in the estimates and in the determination coefficients, because the methods have particularities in the estimation that diverged a lot. Different from the CBL results, the ceilometer underestimates the height of the NBL and can not identify a seasonality in the estimated values.