Artigo

Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon

The aim of this study was to evaluate how the occurrence of nocturnal Low Level Jets (LLJs) may influence the atmospheric turbulence structure and atmospheric stability at the surface. Using data collected from both radiosondes and Eddy Covariance Systems during the WetAMC-LBA campaign, three atmosp...

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Autor principal: Santana, Raoni Aquino Silva da
Outros Autores: Tóta, Júlio, dos Santos, Rosa Maria Nascimento, Vale, Roseilson Santos do
Grau: Artigo
Idioma: pt_BR
Publicado em: Revista Brasileira de Meteorologia 2020
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/15885
id oai:repositorio:1-15885
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spelling oai:repositorio:1-15885 Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon Estabilidade e estrutura da turbulência sob a influência de jatos de baixos níveis noturnos no sudoeste da amazônia Santana, Raoni Aquino Silva da Tóta, Júlio dos Santos, Rosa Maria Nascimento Vale, Roseilson Santos do The aim of this study was to evaluate how the occurrence of nocturnal Low Level Jets (LLJs) may influence the atmospheric turbulence structure and atmospheric stability at the surface. Using data collected from both radiosondes and Eddy Covariance Systems during the WetAMC-LBA campaign, three atmospheric stability regimes were defined at the surface: weakly stable; transition, and very stable. Relating these regimes and the turbulence structure of strong, weak-type 1 (occurring above 500 m) and weak-type 2 (occurring below 500 m) LLJs, it was observed that 22% of the strong LLJ cases were within the weakly stable regime, whereas only 3% of the weak LLJ cases (type 1 and 2) were in this regime. Another interesting result is that in the weak type 1 LLJ cases, the highest percentage were within the very stable regime (approximately 54%). During strong-LLJs, mean friction velocity and mean turbulence kinetic energy were 0.09 ms-1 and 0.13 m2s-2, respectively. For weak-type 1-LLJs, these variables presented respectively values of 0.04 ms-1 and 0.02 m2 s-2, whereas for weak-type 2-LLJs values were 0.06 ms-1 and 0.03 m2s-2, respectively. These results suggest that LLJs with sufficiently high velocities may increase turbulence and introduce weak atmospheric stability at near surface, depending on the height of occurrence. © 2015, Sociedade Brasileira de Meteorologia. All rights reserved. 2020-05-19T21:03:15Z 2020-05-19T21:03:15Z 2015 Artigo https://repositorio.inpa.gov.br/handle/1/15885 10.1590/0102-778620140132 pt_BR Volume 30, Número 4, Pags. 405-414 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Revista Brasileira de Meteorologia
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language pt_BR
description The aim of this study was to evaluate how the occurrence of nocturnal Low Level Jets (LLJs) may influence the atmospheric turbulence structure and atmospheric stability at the surface. Using data collected from both radiosondes and Eddy Covariance Systems during the WetAMC-LBA campaign, three atmospheric stability regimes were defined at the surface: weakly stable; transition, and very stable. Relating these regimes and the turbulence structure of strong, weak-type 1 (occurring above 500 m) and weak-type 2 (occurring below 500 m) LLJs, it was observed that 22% of the strong LLJ cases were within the weakly stable regime, whereas only 3% of the weak LLJ cases (type 1 and 2) were in this regime. Another interesting result is that in the weak type 1 LLJ cases, the highest percentage were within the very stable regime (approximately 54%). During strong-LLJs, mean friction velocity and mean turbulence kinetic energy were 0.09 ms-1 and 0.13 m2s-2, respectively. For weak-type 1-LLJs, these variables presented respectively values of 0.04 ms-1 and 0.02 m2 s-2, whereas for weak-type 2-LLJs values were 0.06 ms-1 and 0.03 m2s-2, respectively. These results suggest that LLJs with sufficiently high velocities may increase turbulence and introduce weak atmospheric stability at near surface, depending on the height of occurrence. © 2015, Sociedade Brasileira de Meteorologia. All rights reserved.
format Artigo
author Santana, Raoni Aquino Silva da
spellingShingle Santana, Raoni Aquino Silva da
Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
author2 Tóta, Júlio
dos Santos, Rosa Maria Nascimento
Vale, Roseilson Santos do
author2Str Tóta, Júlio
dos Santos, Rosa Maria Nascimento
Vale, Roseilson Santos do
title Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
title_short Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
title_full Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
title_fullStr Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
title_full_unstemmed Stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
title_sort stability and turbulence structure under the influence of the nocturnal low level jets in the southwestern amazon
publisher Revista Brasileira de Meteorologia
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/15885
_version_ 1787141134703656960
score 11.755432

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