In this work is presented a statistical description of wind profile in the first 100 m of height of the Planetary Boundary Layer, taking account the measurements in the tower Colonia Eulacio Uruguay. This tower has high vertical resolution of wind velocity measurements, form 10.1 m to 101.8 m. Thermometer are installed in 3.4 m and 100.8 m, also the tower is equipped with wind vane and pyranometer. We present the diurnal cycle of mean wind, intensity of turbulence in dependence of height, also standard deviation of direction is described as a measure of turbulence in wind. Stability state is computed with vertical gradient of temperature. Before sunrise (unstable condition) is seen a decrease in mean velocity of top levels (81.8 m and 101.8 m) and increase in lower levels (10.1 m and 25.7 m). Higher dispersion in dT/dz can be seen during night time (stable condition), superadiabatic values -0.02 ◦C/m can be seen during daytime with slow dispersion. Intensity of turbulence decrease with height, for all stability conditions, is seen a increase in intensity of turbulence for unstable condition.
O presente trabalho analisa o comportamento do perfil vertical do vento nos primeiros 100 metros da camada limite planetária, através da análise de dados observados em uma torre de medição meteorológica no Uruguai, assim como dados simulados pelo modelo numérico WRF-ARW, os quais compreendem o período de 1 ano. Da torre de medição analisada (Colonia Eulacio), foram utilizadas informações referentes a velocidade média do vento em intervalos horários para as alturas de 10.1 metros e 101.8 metros. O modelo WRF-ARW foi executado para o mesmo período dos dados analisados, e configurado com distintas combinações de parametrizações físicas de camada limite planetária e camada limite superficial, buscando assim identificar dentre as diferentes simulações realizadas, qual o comportamento das mesmas em estimar a velocidade média do vento nos períodos anual, estacional durante o ciclo diário para as duas distintas alturas de interesse. Todas as parametrizações analisadas apresentaram um bom ajuste ao ciclo diário quando se comparou o nível eta correspondente a altura de 101.8 metros. Quando se analisou o ciclo diário do nível eta correspondente a 10.1 metros, somente a parametrização física de camada limite planetária Mellor-Yamada-Janjic conseguiu representar os aumentos de velocidade média do vento durante períodos diurnos em todas as estações do ano (inverno, primavera, verão e outono), resultando em uma maior correlação linear e menor erro média absoluto da mesma em relação as outras parametrizações físicas utilizadas no modelo.Palavras chave: Perfil vertical do vento, camada limite planetária, ciclo diário, modelo WRF-ARW.The aim of this article is to analyze the behaviour of the wind speed vertical profile for the first 100 meters of the planetary boundary layer. This is done by analyzing 1 year of ARW-WRF (Weather Research and Forecasting) model outputs as well as anemometric measurements from a tower installed in Uruguay. Colonia Eulacio tower, the tower used, measures wind speed at heights of 10.1 meters and 101.8 meters. In this article, mean hourly wind speeds at each height are used. Different parametrizations of surface layer and planetary boundary layers were set to ARW-WRF modelations, in order to compare their capability to model hourly mean wind speeds from tower measurements considering 101.8m as well as 10.1m height data. Such comparison was done for the whole year as well as for each season. A day-cicle comparison was also performed. All the parametrizations considered showed a good modelation of the Day-cicle for 101.8 meters height data. Regarding 10.1 meters height data, only Mellor-Yamada-Janjic (MYJ) showed a proper modelation of the day-cicle, being the only parametrization capable of representing correctly the mean speed rise during the day for all seasons. As a consequence, MYJ showed the biggest linear correlation factor as well as the lower mean absolute error.
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