Turbulent flow profiles used to estimate the height of the night boundary layer in the Central Amazon
DOI:
https://doi.org/10.5902/2179460X87724Keywords:
Amazon rainforest, ATTO Tower, Turbulent fluxesAbstract
The Atmospheric Boundary Layer (ABL) is the portion of the lower troposphere that interacts with and is influenced by the Earth’s surface. It is a key parameter for micrometeorology, atmospheric chemistry, and other fields of study. However, estimating the height of the nocturnal boundary layer (NBL) is not trivial, and the techniques used so far have never estimated the top of the NBL with turbulent flux profiles (the most appropiate technique for this purpose). This work proposes an innovative methodology for calculating the height of the NBL, using data from 13 three-dimensional sonic anemometers installed on the towers of the ATTO experimental site, located in the central Amazon. Two days were used, one characteristic of the rainy season and the other of the dry season. The results showed that the flux convergence methodology is promising for determining the NBL height. It was observed that, during the dry season, the heights were lower (average of 86.60 m) compared to the rainy season (average of 160.42 m). The higher heights during the rainy season can be attributed to the greater presence of clouds during this period, resulting in a higher amount of longwave radiation emitted by these clouds. This influences the increase in turbulence due to the available radiative balance and, consequently, resulting in higher NBL heights. These results will be further explored with the use of a larger dataset.
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