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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
04/11/2016 |
Data da última atualização: |
20/05/2022 |
Autoria: |
ZAHN, E.; DIAS, N. L.; ARAUJO, A.; SÁ, L.; SÖRGEL, M.; TREBS, I.; WOLFF, S.; MANZI, A. |
Afiliação: |
EINARA ZAHN, UFPR; NELSON L. DIAS, UFPR; ALESSANDRO CARIOCA DE ARAUJO, CPATU; LEONARDO SÁ, INPE; MATTHIAS SÖERGE, Max Planck Institute for Chemistry; IVONNE TREBS, ERIN; STEFAN WOLFF, Max Planck Institute for Chemistry; ANTÔNIO MANZI, INPA. |
Título: |
Scalar turbulent behavior in the roughness sublayer of an Amazonian forest. |
Ano de publicação: |
2016 |
Fonte/Imprenta: |
Atmospheric Chemistry and Physics Discussions, 18 Jan. 2016. |
DOI: |
10.5194/acp-2015-1043 |
Idioma: |
Português |
Conteúdo: |
An important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°???|Z|???20°. We conjecture that this improvement is due to the relationship between sunlight incidence and the ?activation?deactivation? of scalar sinks and sources vertically distributed in the forest. Finally, we evaluated the relaxation coefficient of relaxed eddy accumulation: it is also affected by zenith angle, with considerable improvement in the range 0°???|Z|???20°, and its values fall within the range reported in the literature for the unstable surface layer. In general, our results indicate the possibility of better stability-derived flux estimates for low zenith angle ranges. MenosAn important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°???|Z|???20°. We conjecture that this improvement is due to the relationship between sunlight incidence and the ?activation?deactivation? of scalar sinks and sources vertically distributed in the forest. Finally, we evaluated the relaxation coefficient of relaxed eddy accumulation: it is also affected by zenith angle, with considerable improvement in the range 0°???|Z|???20°, and its values fall within the range reported in the literature for the unstable surface layer. In general, our ... Mostrar Tudo |
Thesagro: |
Climatologia; Floresta Tropical. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/149608/1/acp-2015-1043.pdf
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Marc: |
LEADER 02283naa a2200241 a 4500 001 2055916 005 2022-05-20 008 2016 bl uuuu u00u1 u #d 024 7 $a10.5194/acp-2015-1043$2DOI 100 1 $aZAHN, E. 245 $aScalar turbulent behavior in the roughness sublayer of an Amazonian forest.$h[electronic resource] 260 $c2016 520 $aAn important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°??<??|Z|??<??20°. We conjecture that this improvement is due to the relationship between sunlight incidence and the ?activation?deactivation? of scalar sinks and sources vertically distributed in the forest. Finally, we evaluated the relaxation coefficient of relaxed eddy accumulation: it is also affected by zenith angle, with considerable improvement in the range 0°??<??|Z|??<??20°, and its values fall within the range reported in the literature for the unstable surface layer. In general, our results indicate the possibility of better stability-derived flux estimates for low zenith angle ranges. 650 $aClimatologia 650 $aFloresta Tropical 700 1 $aDIAS, N. L. 700 1 $aARAUJO, A. 700 1 $aSÁ, L. 700 1 $aSÖRGEL, M. 700 1 $aTREBS, I. 700 1 $aWOLFF, S. 700 1 $aMANZI, A. 773 $tAtmospheric Chemistry and Physics Discussions, 18 Jan. 2016.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
14/01/1998 |
Data da última atualização: |
13/07/2018 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
VALICENTE, F. H.; CRUZ, I. |
Afiliação: |
FERNANDO HERCOS VALICENTE, CNPMS; IVAN CRUZ, CNPMS. |
Título: |
Efeito da radiação ultra-violeta na esterilização do Baculovírus Spodoptera. |
Ano de publicação: |
1992 |
Fonte/Imprenta: |
In: CONGRESSO NACIONAL DE MILHO E SORGO, 19.; REUNIÃO TÉCNICA ANUAL DE MILHO, 37.; REUNIÃO TÉCNICA ANUAL DO SORGO, 21., 1992, Porto Alegre. Resumos. Porto Alegre: SAA, 1992. p. 73. |
Idioma: |
Português |
Palavras-Chave: |
Maize; Pest; Pragas. |
Thesagro: |
Baculovirus; Controle Biológico; Milho; Zea Mays. |
Thesaurus NAL: |
biological control. |
Categoria do assunto: |
O Insetos e Entomologia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/51153/1/Efeito-radiacao.pdf
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Marc: |
LEADER 00720nam a2200205 a 4500 001 1478601 005 2018-07-13 008 1992 bl uuuu u00u1 u #d 100 1 $aVALICENTE, F. H. 245 $aEfeito da radiação ultra-violeta na esterilização do Baculovírus Spodoptera.$h[electronic resource] 260 $aIn: CONGRESSO NACIONAL DE MILHO E SORGO, 19.; REUNIÃO TÉCNICA ANUAL DE MILHO, 37.; REUNIÃO TÉCNICA ANUAL DO SORGO, 21., 1992, Porto Alegre. Resumos. Porto Alegre: SAA, 1992. p. 73.$c1992 650 $abiological control 650 $aBaculovirus 650 $aControle Biológico 650 $aMilho 650 $aZea Mays 653 $aMaize 653 $aPest 653 $aPragas 700 1 $aCRUZ, I.
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Embrapa Milho e Sorgo (CNPMS) |
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