Estudo da camada limite noturna na interface Rio-Floresta

Abstract

The present study highlights the importance of studying the atmospheric boundary layer (ABL) in the Amazon, specifically the Nocturnal Boundary Layer (NBL), emphasizing the importance of the behavior of ABL in River-Forest interface. The characterization by means of surveys conducted with tethered balloon on the east side of the Rio Tapajós, showed no significant variations from night to night. However, when rainy, the values of temperature decrease potential from 0.5 to 1.5 ° C increase in the specific humidity from 0.5 to 1.5 g / kg. The height of the NBL, estimated from the Potential Temperature (criterion 1) and Virtual Temperature Potential (criterion 2) profiles, have values very similar, ranging from 50 meters in the evening until around 200 meters early in the morning. The condition of static and dynamic stability was exhibited similarly stable with a layer around 150 meters overnight. From the data of the weather station was possible to verify the change in climate for the study area, showing that there are differences in rainfall totals compared with the values for the around region. It was also observed that 30% of 281 days of 2011 have analyzed the river breeze with more than two hours and days in 50% of the channeling of the wind from north to south due to the topography of the region. Soundings taken at specific times, which occurred river breeze, showed differences between the characteristics of atmospheric levels where data are for the breeze of the river and forest, emphasizing the complexity of studying the physics of the atmosphere in interface forest-river.