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Title: Is There a Classical Inertial Sublayer Over the Amazon Forest?
Authors: Dias Júnior, Cléo Quaresma
Dias, Nelson Luís da Costa
dos Santos, Rosa Maria Nascimento
Sörgel, Matthias
Araüjo, Alessandro Carioca de
Tsokankunku, Anywhere
Ditas, Florian
Santana, Raoni Aquino Silva de
Randow, Celso Von
Marta, S. Á.
Pöhlker, Christopher
Machado, Luiz Augusto Toledo
Sá, Leonardo Deane de
Morán-Zuloaga, Daniel
Janssen, Ruud H.H.
Acevedo, Otávio C.
Oliveira, Pablo E.S.
Fisch, Gilberto Fernando
Chor, Tomás L.
Manzi, Antônio Ocimar
Keywords: Surface Roughness
Amazon Forests
Inertial Sublayer
Monin-obukhov Similarity Theory
Roughness Sublayers
Surface Layers
Atmospheric Convection
Boundary Layer
Flux Measurement
Forest Canopy
Mixed Layer
Surface Layer
Surface Roughness
Issue Date: 2019
metadata.dc.publisher.journal: Geophysical Research Letters
metadata.dc.relation.ispartof: Volume 46, Número 10, Pags. 5614-5622
Abstract: On the basis of measurements over different surfaces, an inertial sublayer (ISL), where Monin-Obukhov Similarity Theory applies, exists above z=3h, where h is canopy height. The roughness sublayer is within h<z<3h. Most studies of the surface layer above forests, however, are able to probe only a narrow region above h. Therefore, direct verification of an ISL above tall forests is difficult. In this study we conducted a systematic analysis of unstable turbulence characteristics at heights from 40 to 325 m, measured at an 80m, and the recently built 325-m Amazon Tall Tower Observatory towers over the Amazon forest. Our analyses have revealed no indication of the existence of an ISL; instead, the roughness sublayer directly merges with the convective mixed layer above. Implications for estimates of momentum and scalar fluxes in numerical models and observational studies can be significant. ©2019. American Geophysical Union. All Rights Reserved.
metadata.dc.identifier.doi: 10.1029/2019GL083237
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