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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
30/11/2015 |
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Data da última atualização: |
16/03/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TEIXEIRA, A. H. de C.; ANDRADE, R. G.; LEIVAS, J. F. |
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Afiliação: |
ANTONIO HERIBERTO DE C TEIXEIRA, CNPM; RICARDO GUIMARAES ANDRADE, CNPM; JANICE FREITAS LEIVAS, CNPM. |
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Título: |
Energy and mass transfer parameters in a Brazilian Semi-Arid ecosystem under different thermohydrological conditions. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Revista Brasileira de Meteorologia, v. 30, n. 4, p. 297-308, 2015. |
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DOI: |
http://dx.doi.org/10.1590/0102-77862013057920140101 |
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Idioma: |
Inglês |
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Conteúdo: |
In the Brazilian semi-arid region, the natural vegetation (?Caatinga?) has been replaced by irrigated agriculture, emphasising the importance for quantification of the energy and mass exchanges. Eddy covariance and micro-climatic measurements in this natural ecosystem, were analysed for two years under different thermohydrological conditions. Sensible heat flux (H) accounted for 49 and 64% of the net radiation (Rn), respectively, during the wetter and the drier conditions of 2004 and 2005. The corresponding fractions of Rn partitioned as latent heat flux (LE) were 40% and 25%. Evapotranspiration (ET) in 2004, with 693 mm, represented 96% of precipitation (P), while in 2005 (399 mm), it was 18% higher than P, which evidenced the use of the remaining soil moisture from the previous wetter year. All the soil-water-vegetation-atmosphere transfer parameters were influenced by the rainfall amounts. However, the surface resistance (rs) was the most strongly affected by the soil moisture status, dropping with increases of the ratio of ET to reference evapotranspiration (ET0). On the other hand, the highest rs values were related to increases in both vapour pressure deficit (De) and aerodynamic temperature (T0). The current research aimed to quantify the energy and mass exchange between the ?Caatinga? and the lower atmosphere, testing in which circumstances the biophysical controlling parameters can be reasonably predicted from agrometeorological data, throughout parameterizations, to incorporate in large-scale models. MenosIn the Brazilian semi-arid region, the natural vegetation (?Caatinga?) has been replaced by irrigated agriculture, emphasising the importance for quantification of the energy and mass exchanges. Eddy covariance and micro-climatic measurements in this natural ecosystem, were analysed for two years under different thermohydrological conditions. Sensible heat flux (H) accounted for 49 and 64% of the net radiation (Rn), respectively, during the wetter and the drier conditions of 2004 and 2005. The corresponding fractions of Rn partitioned as latent heat flux (LE) were 40% and 25%. Evapotranspiration (ET) in 2004, with 693 mm, represented 96% of precipitation (P), while in 2005 (399 mm), it was 18% higher than P, which evidenced the use of the remaining soil moisture from the previous wetter year. All the soil-water-vegetation-atmosphere transfer parameters were influenced by the rainfall amounts. However, the surface resistance (rs) was the most strongly affected by the soil moisture status, dropping with increases of the ratio of ET to reference evapotranspiration (ET0). On the other hand, the highest rs values were related to increases in both vapour pressure deficit (De) and aerodynamic temperature (T0). The current research aimed to quantify the energy and mass exchange between the ?Caatinga? and the lower atmosphere, testing in which circumstances the biophysical controlling parameters can be reasonably predicted from agrometeorological data, throughout parameterizations, t... Mostrar Tudo |
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Palavras-Chave: |
Modelling; Roughness parameters. |
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Thesagro: |
Caatinga. |
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Thesaurus Nal: |
Energy balance. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02226naa a2200205 a 4500
001 2029923
005 2016-03-16
008 2015 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1590/0102-77862013057920140101$2DOI
100 1 $aTEIXEIRA, A. H. de C.
245 $aEnergy and mass transfer parameters in a Brazilian Semi-Arid ecosystem under different thermohydrological conditions.$h[electronic resource]
260 $c2015
520 $aIn the Brazilian semi-arid region, the natural vegetation (?Caatinga?) has been replaced by irrigated agriculture, emphasising the importance for quantification of the energy and mass exchanges. Eddy covariance and micro-climatic measurements in this natural ecosystem, were analysed for two years under different thermohydrological conditions. Sensible heat flux (H) accounted for 49 and 64% of the net radiation (Rn), respectively, during the wetter and the drier conditions of 2004 and 2005. The corresponding fractions of Rn partitioned as latent heat flux (LE) were 40% and 25%. Evapotranspiration (ET) in 2004, with 693 mm, represented 96% of precipitation (P), while in 2005 (399 mm), it was 18% higher than P, which evidenced the use of the remaining soil moisture from the previous wetter year. All the soil-water-vegetation-atmosphere transfer parameters were influenced by the rainfall amounts. However, the surface resistance (rs) was the most strongly affected by the soil moisture status, dropping with increases of the ratio of ET to reference evapotranspiration (ET0). On the other hand, the highest rs values were related to increases in both vapour pressure deficit (De) and aerodynamic temperature (T0). The current research aimed to quantify the energy and mass exchange between the ?Caatinga? and the lower atmosphere, testing in which circumstances the biophysical controlling parameters can be reasonably predicted from agrometeorological data, throughout parameterizations, to incorporate in large-scale models.
650 $aEnergy balance
650 $aCaatinga
653 $aModelling
653 $aRoughness parameters
700 1 $aANDRADE, R. G.
700 1 $aLEIVAS, J. F.
773 $tRevista Brasileira de Meteorologia$gv. 30, n. 4, p. 297-308, 2015.
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Registro original: |
Embrapa Territorial (CNPM) |
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