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| Registros recuperados : 77 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
24/01/2013 |
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Data da última atualização: |
07/02/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 3 |
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Autoria: |
TEIXEIRA, A. H. de C.; HERNANDEZ, F. B. T.; LOPES, H. L. |
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Afiliação: |
ANTONIO HERIBERTO DE C TEIXEIRA, CPATSA; FERNANDO B. T. HERNANDEZ; HÉLIO L. LOPES. |
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Título: |
Application of Landsat images for quantifying the energy balance under conditions of land use changes in the Semi-Arid region of Brazil. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Proceedings of SPIE - Remote Sensing for Agriculture, Ecosystems and Hrydrology, v. 8531, sept. 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
In the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower atmosphere. Landsat satellite images and agro-meteorological stations from 1992 to 2011 were used together, for modelling these exchanges. Surface albedo (0), NDVI and surface temperature (T0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux E) and the surface resistance to evapotranspiration (rs) on a large scale. The daily net radiation (Rn) was obtained from 0, air temperature (Ta) and short-wave transmissivity (sw) throughout the slob equation, allowing the quantification of the daily sensible heat flux (H) by residual in the energy balance equation. With a threshold value for rs, it was possible to separate the energy fluxes from crops and natural vegetation. The averaged fractions of Rn partitioned as H and E, were in average 39 and 67%, respectively. It was observed an increase of the energy used for the evapotranspiration process inside irrigated areas from 51% in 1992 to 80% in 2011, with the ratio E/Rn presenting an increase of 3 % per year. The tools and models applied in the current research, can subsidize the monitoring of the coupled climate and land use changes effects in irrigation perimeters, being valuable when aiming the sustainability of the irrigated agriculture in the future, avoiding conflicts among different water users. MenosIn the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower atmosphere. Landsat satellite images and agro-meteorological stations from 1992 to 2011 were used together, for modelling these exchanges. Surface albedo (0), NDVI and surface temperature (T0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux E) and the surface resistance to evapotranspiration (rs) on a large scale. The daily net radiation (Rn) was obtained from 0, air temperature (Ta) and short-wave transmissivity (sw) throughout the slob equation, allowing the quantification of the daily sensible heat flux (H) by residual in the energy balance equation. With a threshold value for rs, it was possible to separate the energy fluxes from crops and natural vegetation. The averaged fractions of Rn partitioned as H and E, were in average 39 and 67%, respectively. It was observed an increase of the energy used for the evapotranspiration process inside irrigated areas from 51% in 1992 to 80% in 2011, with the ratio E/Rn presenting an increase of 3 % per year. The tools and models applied in the current research, can subsidize the monitoring of the coupled climate and land use changes effects in irrigation perimeters, being valuable when aiming the sustainability of the irrigated agriculture in t... Mostrar Tudo |
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Palavras-Chave: |
Albedo da superfície; Fluxo de calor latente; Fluxo de calor sensível; Natural resource; NDVI; Resistência da superficie; Sensorimento remoto; Temperatura da superfície. |
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Thesagro: |
Recurso natural. |
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Thesaurus NAL: |
Remote sensing. |
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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/75169/1/AHeriberto-2012-1.pdf
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Marc: |
LEADER 02471naa a2200265 a 4500
001 1946220
005 2018-02-07
008 2012 bl uuuu u00u1 u #d
100 1 $aTEIXEIRA, A. H. de C.
245 $aApplication of Landsat images for quantifying the energy balance under conditions of land use changes in the Semi-Arid region of Brazil.$h[electronic resource]
260 $c2012
520 $aIn the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower atmosphere. Landsat satellite images and agro-meteorological stations from 1992 to 2011 were used together, for modelling these exchanges. Surface albedo (0), NDVI and surface temperature (T0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux E) and the surface resistance to evapotranspiration (rs) on a large scale. The daily net radiation (Rn) was obtained from 0, air temperature (Ta) and short-wave transmissivity (sw) throughout the slob equation, allowing the quantification of the daily sensible heat flux (H) by residual in the energy balance equation. With a threshold value for rs, it was possible to separate the energy fluxes from crops and natural vegetation. The averaged fractions of Rn partitioned as H and E, were in average 39 and 67%, respectively. It was observed an increase of the energy used for the evapotranspiration process inside irrigated areas from 51% in 1992 to 80% in 2011, with the ratio E/Rn presenting an increase of 3 % per year. The tools and models applied in the current research, can subsidize the monitoring of the coupled climate and land use changes effects in irrigation perimeters, being valuable when aiming the sustainability of the irrigated agriculture in the future, avoiding conflicts among different water users.
650 $aRemote sensing
650 $aRecurso natural
653 $aAlbedo da superfície
653 $aFluxo de calor latente
653 $aFluxo de calor sensível
653 $aNatural resource
653 $aNDVI
653 $aResistência da superficie
653 $aSensorimento remoto
653 $aTemperatura da superfície
700 1 $aHERNANDEZ, F. B. T.
700 1 $aLOPES, H. L.
773 $tProceedings of SPIE - Remote Sensing for Agriculture, Ecosystems and Hrydrology$gv. 8531, sept. 2012.
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Embrapa Semiárido (CPATSA) |
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