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83. | | DIAS, N. da S.; DUARTE, S. N.; GHEYI, H. R.; MEDEIROS, J. F. de; SOARES, T. M. Manejo da fertirrigação e controle da salinidade do solo sob ambiente protegido, utilizando-se extratores de solução do solo. Revista Brasileira de Engenharia Agrícola e Ambiental, v.9,n.4,p.496-504,out./dez., 2005. Biblioteca(s): Embrapa Algodão. |
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85. | | ANDRADE, V. P. M. de; SIMOES, W. L.; SILVA, W. O. da; NASCIMENTO, B. R. do; DIAS, N. da S. Produção da manga Kent submetida a deficit hídrico controlado no Submédio do Vale do São Francisco. In: JORNADA DE INTEGRAÇÃO DA PÓS-GRADUAÇÃO DA EMBRAPA SEMIÁRIDO, 4., 2019, Petrolina. Anais... Petrolina: Embrapa Semiárido, 2020. p. 28. (Embrapa Semiárido. Documentos, 294). Biblioteca(s): Embrapa Semiárido. |
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88. | | COSME, C. R.; DIAS, N. da S.; OLIVEIRA, A. M. de; OLIVEIRA, E. M. M.; SOUSA NETO, O. N. de. Produção de tomate hidropônico utilizando rejeito da dessalinização na solução nutritiva aplicados em diferentes épocas. Revista Brasileira de Engenharia Agrícola e Ambiental, v. 15, n. 5, p. 499-504, maio, 2011. Biblioteca(s): Embrapa Algodão. |
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89. | | ANDRADE JUNIOR, A. S. de; DIAS, N. da S.; FIGUEIREDO JUNIOR, L. G. M.; RIBEIRO, V. Q.; SAMPAIO, D. B. Produção e qualidade de frutos de melancia à aplicação de nitrogênio via fertirrigação. Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 10, n. 4, p. 836-841, 2006. Biblioteca(s): Embrapa Algodão; Embrapa Meio-Norte. |
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90. | | BLEICHER, E.; MELO, Q. M. S.; MESQUITA, A. L. M.; BRAGA SOBRINHO, R.; DIAS, N. da S. Pragas. In: ARAÚJO, J. P. P. de (Ed.). Caju: o produtor pergunta, a Embrapa responde. 2.ed. rev. e atualiz. Brasília, DF: Embrapa, 2015. Cap. 8, p. 129-152. Biblioteca(s): Embrapa Agroindústria Tropical. |
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92. | | VIEIRA, A. F.; NUNES, R. L. C.; TORRES, R. de A.; DIAS, N. da S.; OLIVEIRA, A. B. de. Avaliação agronômica de híbridos de milho para silagem em Baraúna, região Semiárida Nordestina. Revista Brasileira de Milho e Sorgo, Sete Lagoas, v. 14, n. 2, p. 283-290, 2015. Biblioteca(s): Embrapa Milho e Sorgo. |
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99. | | ANDRADE JUNIOR, A. S. de; DIAS, N. da S.; FIGUEREDO JÚNIOR, L. G. M. de; RIBEIRO, V. Q.; DANIEL, R. Fertirrigação nitrogenada e potássica na cultura da melancia. In: CONGRESO LATINOAMERICANO Y DEL CARIBE DE INGENIERIA AGRICOLA - CLIA, 7.; CONGRESO INTERNACIONAL DE INGENIERIA AGRICOLA - CIACH, 5., 2006, Chillán. La ingenieria agrícola en un mundo globalizado. Resúmenes. Chillán, Chile: ALIA, 2006. p. 87 Biblioteca(s): Embrapa Meio-Norte. |
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Registros recuperados : 242 | |
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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
|
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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Embrapa Amazônia Oriental (CPATU) |
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