TY - JOUR
T1 - Calibration of METRIC model to estimate energy balance over a drip-irrigated apple orchard
AU - de la Fuente-Sáiz, Daniel
AU - Ortega-Farías, Samuel
AU - Fonseca, David
AU - Ortega-Salazar, Samuel
AU - Kilic, Ayse
AU - Allen, Richard
N1 - Publisher Copyright:
© 2017 by the authors.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - A field experiment was carried out to calibrate and evaluate the METRIC (Mapping EvapoTranspiration at high Resolution Internalized with Calibration) model for estimating the spatial and temporal variability of instantaneous net radiation (Rni), soil heat flux (Gi), sensible heat flux (Hi), and latent heat flux (LEi) over a drip-irrigated apple (Malus domestica cv. Pink Lady) orchard located in the Pelarco valley, Maule Region, Chile (35°25'20"LS; 71°23'57"LW; 189 m.a.s.l.). The study was conducted in a plot of 5.5 hectares using 20 satellite images (Landsat 7 ETM+) acquired on clear sky days during three growing seasons (2012/2013, 2013/2014 and 2014/2015). Specific sub-models to estimate Gi, leaf area index (LAI) and aerodynamic roughness length for momentum transfer (Zom) were calibrated for the apple orchard as an improvement to the standard METRIC model. The performance of the METRIC model was evaluated at the time of satellite overpass using measurements of Hi and LEi obtained from an eddy correlation system. In addition, estimated values of Rni, Gi and LAI were compared with ground-truth measurements from a four-way net radiometer, soil heat flux plates and plant canopy analyzer, respectively. Validation indicated that LAI, Zom and Gi were estimated using the calibrated functions with errors of +2%, +6% and +3% while those were computed using the standard functions with error of +59%, +83%, and +12%, respectively. In addition, METRIC using the calibrated functions estimated Hi and LEi with error of +5% and +16%, while using the original functions estimated Hi and LEi with error of +29% and +26%, respectively.
AB - A field experiment was carried out to calibrate and evaluate the METRIC (Mapping EvapoTranspiration at high Resolution Internalized with Calibration) model for estimating the spatial and temporal variability of instantaneous net radiation (Rni), soil heat flux (Gi), sensible heat flux (Hi), and latent heat flux (LEi) over a drip-irrigated apple (Malus domestica cv. Pink Lady) orchard located in the Pelarco valley, Maule Region, Chile (35°25'20"LS; 71°23'57"LW; 189 m.a.s.l.). The study was conducted in a plot of 5.5 hectares using 20 satellite images (Landsat 7 ETM+) acquired on clear sky days during three growing seasons (2012/2013, 2013/2014 and 2014/2015). Specific sub-models to estimate Gi, leaf area index (LAI) and aerodynamic roughness length for momentum transfer (Zom) were calibrated for the apple orchard as an improvement to the standard METRIC model. The performance of the METRIC model was evaluated at the time of satellite overpass using measurements of Hi and LEi obtained from an eddy correlation system. In addition, estimated values of Rni, Gi and LAI were compared with ground-truth measurements from a four-way net radiometer, soil heat flux plates and plant canopy analyzer, respectively. Validation indicated that LAI, Zom and Gi were estimated using the calibrated functions with errors of +2%, +6% and +3% while those were computed using the standard functions with error of +59%, +83%, and +12%, respectively. In addition, METRIC using the calibrated functions estimated Hi and LEi with error of +5% and +16%, while using the original functions estimated Hi and LEi with error of +29% and +26%, respectively.
KW - Fruit orchards
KW - Leaf area index
KW - Momentum roughness length
KW - Perrier function
KW - Satellite images
UR - http://www.scopus.com/inward/record.url?scp=85022342198&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85022342198&partnerID=8YFLogxK
U2 - 10.3390/rs9070670
DO - 10.3390/rs9070670
M3 - Article
AN - SCOPUS:85022342198
SN - 2072-4292
VL - 9
JO - Remote Sensing
JF - Remote Sensing
IS - 7
M1 - 670
ER -