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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
20/09/2016 |
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Data da última atualização: |
19/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ZAHN, E.; DIAS, N. L.; ARAUJO, A.; SÁ, L. D. A.; SÖRGEL, M.; TREBS, I.; WOLFF, S.; MANZI, A. |
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Afiliação: |
Einara Zahn, Graduate Program in Environmental Engineering (PPGEA), UFPR; Nelson L. Dias, UFPR; ALESSANDRO CARIOCA DE ARAUJO, CPATU; Leonardo D. A. Sá, INPE; Matthias Sörgel, Max Planck Institute for Chemistry; Ivonne Trebs, Environmental Research and Innovation (ERIN); Stefan Wolff, Max Planck Institute for Chemistry; Antônio Manzi, INPE. |
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Título: |
Scalar turbulent behavior in the roughness sublayer of an Amazonian forest. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Atmospheric Chemistry and Physics, v. 16, p. 11349-11366, 2016. |
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DOI: |
10.5194/acp-16-11349-2016 |
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Idioma: |
Inglês |
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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 ... Mostrar Tudo |
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Thesagro: |
Climatologia; Floresta Tropical. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/147628/1/acp-16-11349-2016.pdf
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Marc: |
LEADER 02404naa a2200241 a 4500
001 2053165
005 2022-05-19
008 2016 bl uuuu u00u1 u #d
024 7 $a10.5194/acp-16-11349-2016$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. D. A.
700 1 $aSÖRGEL, M.
700 1 $aTREBS, I.
700 1 $aWOLFF, S.
700 1 $aMANZI, A.
773 $tAtmospheric Chemistry and Physics$gv. 16, p. 11349-11366, 2016.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
14/09/2021 |
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Data da última atualização: |
14/09/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SILVEIRA, R. B.; VIANA, E. de S.; JESUS, J. L. de; REIS, R. C.; PADUA, T. R. P. de. |
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Afiliação: |
REJIANE BRANDÃO SILVEIRA, FAMAM; ELISETH DE SOUZA VIANA, CNPMF; JACIENE LOPES DE JESUS, CNPMF; RONIELLI CARDOSO REIS, CNPMF; TULLIO RAPHAEL PEREIRA DE PADUA, CNPMF. |
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Título: |
Caracterização físico-química de frutos de mamoeiro Tainung nº1 e BS2000 orgânicos, enxertados no acesso BAG CMF075. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
In: JORNADA CIENTÍFICA EMBRAPA MANDIOCA E FRUTICULTURA, 14., 2020. Ciência em tempos de crise: resumos. Cruz das Almas, BA: Embrapa Mandioca e Fruticultura, 2020. 112 p. il. |
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Idioma: |
Português |
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Thesagro: |
Mamão. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/225984/1/p60.pdf
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Marc: |
LEADER 00664nam a2200157 a 4500
001 2134367
005 2021-09-14
008 2020 bl uuuu u00u1 u #d
100 1 $aSILVEIRA, R. B.
245 $aCaracterização físico-química de frutos de mamoeiro Tainung nº1 e BS2000 orgânicos, enxertados no acesso BAG CMF075.$h[electronic resource]
260 $aIn: JORNADA CIENTÍFICA EMBRAPA MANDIOCA E FRUTICULTURA, 14., 2020. Ciência em tempos de crise: resumos. Cruz das Almas, BA: Embrapa Mandioca e Fruticultura, 2020. 112 p. il.$c2020
650 $aMamão
700 1 $aVIANA, E. de S.
700 1 $aJESUS, J. L. de
700 1 $aREIS, R. C.
700 1 $aPADUA, T. R. P. de
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Embrapa Mandioca e Fruticultura (CNPMF) |
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