Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon

Net radiation (Rn) is the main energy balance component controlling evaporation and transpiration processes. In this regard, this study evaluated two models to estimate Rno above a commercial vineyard (Vitis vinifera cv. Cabernet Sauvignon) located in Pencahue Valley, Maule Region (35°22’...

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Autores principales:	Carrasco,Marcos, Ortega-Farías,Samuel
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2008
Materias:	atmospheric emissivity terrestrial radiation atmospheric radiation energy balance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200005
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spelling	oai:scielo:S0718-583920080002000052018-10-01Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet SauvignonCarrasco,MarcosOrtega-Farías,Samuel atmospheric emissivity terrestrial radiation atmospheric radiation energy balance Net radiation (Rn) is the main energy balance component controlling evaporation and transpiration processes. In this regard, this study evaluated two models to estimate Rno above a commercial vineyard (Vitis vinifera cv. Cabernet Sauvignon) located in Pencahue Valley, Maule Region (35°22’ S; 71°47’ Wl; 75 m.a.s.l.). An automatic meteorological station (AMS) was installed in the central part of the vineyard and used to measure Rn, solar radiation (Rsi), air temperature (Ta), canopy temperature (Tf) and relative humidity (RH). On a 30 min interval, results indicated that model Rne1 (assuming Ta ≠ Tf) and model Rne2 (assuming Ta = Tf ) were able to estimate Rn with a mean absolute error (MAE) of less than 40 W m-2 and root mean square error (RMSE) of less than 61 W m-2. On daily intervals, the two models estimated Rno with MAE and RMSE values of less than 1.68 and 1.75 MJ m-2 d-1, respectively. In global terms, the models presented errors below 9 and 11% on 30 min and daily intervals, respectively. Furthermore, this study indicated that the incorporation of canopy temperature did not improve the Rno estimation substantially, in spite of having a temperature gradient (dT = Tf - Ta) between -3 and to 4°C. These results suggest that an Rne2 model could be used to estimate Rno using Rsi, Ta and RH measurements.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.68 n.2 20082008-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200005en10.4067/S0718-58392008000200005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	atmospheric emissivity terrestrial radiation atmospheric radiation energy balance
spellingShingle	atmospheric emissivity terrestrial radiation atmospheric radiation energy balance Carrasco,Marcos Ortega-Farías,Samuel Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
description	Net radiation (Rn) is the main energy balance component controlling evaporation and transpiration processes. In this regard, this study evaluated two models to estimate Rno above a commercial vineyard (Vitis vinifera cv. Cabernet Sauvignon) located in Pencahue Valley, Maule Region (35°22’ S; 71°47’ Wl; 75 m.a.s.l.). An automatic meteorological station (AMS) was installed in the central part of the vineyard and used to measure Rn, solar radiation (Rsi), air temperature (Ta), canopy temperature (Tf) and relative humidity (RH). On a 30 min interval, results indicated that model Rne1 (assuming Ta ≠ Tf) and model Rne2 (assuming Ta = Tf ) were able to estimate Rn with a mean absolute error (MAE) of less than 40 W m-2 and root mean square error (RMSE) of less than 61 W m-2. On daily intervals, the two models estimated Rno with MAE and RMSE values of less than 1.68 and 1.75 MJ m-2 d-1, respectively. In global terms, the models presented errors below 9 and 11% on 30 min and daily intervals, respectively. Furthermore, this study indicated that the incorporation of canopy temperature did not improve the Rno estimation substantially, in spite of having a temperature gradient (dT = Tf - Ta) between -3 and to 4°C. These results suggest that an Rne2 model could be used to estimate Rno using Rsi, Ta and RH measurements.
author	Carrasco,Marcos Ortega-Farías,Samuel
author_facet	Carrasco,Marcos Ortega-Farías,Samuel
author_sort	Carrasco,Marcos
title	Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
title_short	Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
title_full	Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
title_fullStr	Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
title_full_unstemmed	Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon
title_sort	evaluation of a model to simulate net radiation over a vineyar cv. cabernet sauvignon
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200005
work_keys_str_mv	AT carrascomarcos evaluationofamodeltosimulatenetradiationoveravineyarcvcabernetsauvignon AT ortegafariassamuel evaluationofamodeltosimulatenetradiationoveravineyarcvcabernetsauvignon
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Evaluation of a model to Simulate Net Radiation Over a Vineyar cv. Cabernet Sauvignon

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