Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.

Detalhes bibliográficos
Autor(a) principal: TEIXEIRA, A. H. de C.
Data de Publicação: 2012
Outros Autores: BASTIAANSSEN, W. G. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/914291
Resumo: Energy balance measurements were carried out in a mango orchard during two growing seasons in the semi-arid region of Brazil. The actual evapotranspiration (ET) was acquired by eddy correlation (EC) and Bowen ratio energy balance (BR) techniques. The daily energy balance closure in the EC measurements showed an average gap of 12%, with a root mean square error (RMSE) of 1.7 MJ m-2 d-1. Three different correction procedures were tested for closing the energy balance from the EC system: (1) the surface energy balance residual method (RES), (2) the Bowen ratio determined from the EC fluxes, the combination approach (EC_BR), and (3) a new regression energy balance closure technique (REG). All closing energy balance methods presented good correlation with the direct EC measurements, but the trends were not similar. The latent heat fluxes estimated by the BR method—kEBR —were higher than those from the direct EC measurements—kEEC. When using the RES method, the half-hour kEEC measurements represented around 88% of the kERES values, as the uncertainties of net radiation— Rn —and soil heat fluxes—G—are propagated into the RES method. The latent heat flux derived from the combination approach—kEEC_BR —also brings these uncertainties, being the agreements comparable with those for RES method. It was therefore concluded that a single correction method for EC measurements considering only the latent and sensible heat fluxes does not exist. A new way to solve the lack of energy balance closure from EC techniques was tested by means of a curve fitting, the REG method. Considering the REG corrections applied to the energy balance components involving all periods of the day and the average conditions of the two growing seasons, half-hour values of kEEC were overmeasured by 18%, HEC was undermeasured by 17%, and G values required a correction of 466%. The REG method appeared promising because it considers different weights for all energy balance components in the optimi- zation process. Taking the REG results for the drier second growing season as a reference, it was concluded that seasonal ET values by the other methods in mango orchard ranged from 7 to 28% higher, showing that turbulent flux measurements lack accuracy for executing on-farm water-saving programmes and calibrating transient soil water flow models.
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spelling Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.Pomar de mangaMangaBalanço de EnergiaIrrigaçãoEvapotranspiraçãoMangoesIrrigationEnergy balance measurements were carried out in a mango orchard during two growing seasons in the semi-arid region of Brazil. The actual evapotranspiration (ET) was acquired by eddy correlation (EC) and Bowen ratio energy balance (BR) techniques. The daily energy balance closure in the EC measurements showed an average gap of 12%, with a root mean square error (RMSE) of 1.7 MJ m-2 d-1. Three different correction procedures were tested for closing the energy balance from the EC system: (1) the surface energy balance residual method (RES), (2) the Bowen ratio determined from the EC fluxes, the combination approach (EC_BR), and (3) a new regression energy balance closure technique (REG). All closing energy balance methods presented good correlation with the direct EC measurements, but the trends were not similar. The latent heat fluxes estimated by the BR method—kEBR —were higher than those from the direct EC measurements—kEEC. When using the RES method, the half-hour kEEC measurements represented around 88% of the kERES values, as the uncertainties of net radiation— Rn —and soil heat fluxes—G—are propagated into the RES method. The latent heat flux derived from the combination approach—kEEC_BR —also brings these uncertainties, being the agreements comparable with those for RES method. It was therefore concluded that a single correction method for EC measurements considering only the latent and sensible heat fluxes does not exist. A new way to solve the lack of energy balance closure from EC techniques was tested by means of a curve fitting, the REG method. Considering the REG corrections applied to the energy balance components involving all periods of the day and the average conditions of the two growing seasons, half-hour values of kEEC were overmeasured by 18%, HEC was undermeasured by 17%, and G values required a correction of 466%. The REG method appeared promising because it considers different weights for all energy balance components in the optimi- zation process. Taking the REG results for the drier second growing season as a reference, it was concluded that seasonal ET values by the other methods in mango orchard ranged from 7 to 28% higher, showing that turbulent flux measurements lack accuracy for executing on-farm water-saving programmes and calibrating transient soil water flow models.ANTONIO HERIBERTO DE C TEIXEIRA, CPATSA; W. G. M. BASTIAANSSEN.TEIXEIRA, A. H. de C.BASTIAANSSEN, W. G. M.2012-02-03T11:11:11Z2012-02-03T11:11:11Z2012-02-03T11:11:11Z2012-02-03T11:11:11Z2012-02-0320122012-04-09T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleIrrigation Science, v. 30, n. 1, p. 13-28, 2012.http://www.alice.cnptia.embrapa.br/alice/handle/doc/91429110.1007/s00271-010-0256-yenginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T00:10:28Zoai:www.alice.cnptia.embrapa.br:doc/914291Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T00:10:28falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T00:10:28Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
title Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
spellingShingle Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
TEIXEIRA, A. H. de C.
Pomar de manga
Manga
Balanço de Energia
Irrigação
Evapotranspiração
Mangoes
Irrigation
title_short Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
title_full Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
title_fullStr Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
title_full_unstemmed Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
title_sort Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
author TEIXEIRA, A. H. de C.
author_facet TEIXEIRA, A. H. de C.
BASTIAANSSEN, W. G. M.
author_role author
author2 BASTIAANSSEN, W. G. M.
author2_role author
dc.contributor.none.fl_str_mv ANTONIO HERIBERTO DE C TEIXEIRA, CPATSA; W. G. M. BASTIAANSSEN.
dc.contributor.author.fl_str_mv TEIXEIRA, A. H. de C.
BASTIAANSSEN, W. G. M.
dc.subject.por.fl_str_mv Pomar de manga
Manga
Balanço de Energia
Irrigação
Evapotranspiração
Mangoes
Irrigation
topic Pomar de manga
Manga
Balanço de Energia
Irrigação
Evapotranspiração
Mangoes
Irrigation
description Energy balance measurements were carried out in a mango orchard during two growing seasons in the semi-arid region of Brazil. The actual evapotranspiration (ET) was acquired by eddy correlation (EC) and Bowen ratio energy balance (BR) techniques. The daily energy balance closure in the EC measurements showed an average gap of 12%, with a root mean square error (RMSE) of 1.7 MJ m-2 d-1. Three different correction procedures were tested for closing the energy balance from the EC system: (1) the surface energy balance residual method (RES), (2) the Bowen ratio determined from the EC fluxes, the combination approach (EC_BR), and (3) a new regression energy balance closure technique (REG). All closing energy balance methods presented good correlation with the direct EC measurements, but the trends were not similar. The latent heat fluxes estimated by the BR method—kEBR —were higher than those from the direct EC measurements—kEEC. When using the RES method, the half-hour kEEC measurements represented around 88% of the kERES values, as the uncertainties of net radiation— Rn —and soil heat fluxes—G—are propagated into the RES method. The latent heat flux derived from the combination approach—kEEC_BR —also brings these uncertainties, being the agreements comparable with those for RES method. It was therefore concluded that a single correction method for EC measurements considering only the latent and sensible heat fluxes does not exist. A new way to solve the lack of energy balance closure from EC techniques was tested by means of a curve fitting, the REG method. Considering the REG corrections applied to the energy balance components involving all periods of the day and the average conditions of the two growing seasons, half-hour values of kEEC were overmeasured by 18%, HEC was undermeasured by 17%, and G values required a correction of 466%. The REG method appeared promising because it considers different weights for all energy balance components in the optimi- zation process. Taking the REG results for the drier second growing season as a reference, it was concluded that seasonal ET values by the other methods in mango orchard ranged from 7 to 28% higher, showing that turbulent flux measurements lack accuracy for executing on-farm water-saving programmes and calibrating transient soil water flow models.
publishDate 2012
dc.date.none.fl_str_mv 2012-02-03T11:11:11Z
2012-02-03T11:11:11Z
2012-02-03T11:11:11Z
2012-02-03T11:11:11Z
2012-02-03
2012
2012-04-09T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Irrigation Science, v. 30, n. 1, p. 13-28, 2012.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/914291
10.1007/s00271-010-0256-y
identifier_str_mv Irrigation Science, v. 30, n. 1, p. 13-28, 2012.
10.1007/s00271-010-0256-y
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/914291
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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