Turbulence regimes in the stable boundary layer above the Amazon Rainforest
DOI:
https://doi.org/10.5902/2179460X75412Keywords:
Tropical forest, Turbulence regimes, Roughness sublayerAbstract
We identify two nocturnal turbulence regimes at different heights above the Amazon Forest and their variation in relation to the proximity of the forest canopy. We analyzed fast response data measured at the Uatumã Sustainable Development Reserve in central Amazonia, Brazil, during September 2021 to January 2022. Our results show that the threshold wind speed that separate the weak turbulence regime from strong turbulence regime increased as a function of the distance above the canopy (43 m, 50 m, 75 m, 100 m, 127 m, 151 m e 172 m). However, at 196 m, 223 m, 247 m, 274 m e 298 m height the change of the turbulence regime occurred at the same threshold wind speed. In contrast, at 316 m we evidenced only situations where the turbulence was weak. This pattern indicated that the structure and roughness of dense forest affect the turbulence structure.
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