A comparison among different modified Priestley and Taylor equations to calculate actual evapotranspiration with MODIS data

Venturini, Virginia; Rodríguez, Leticia; Bisht, Gautam

doi:10.1080/01431160903547965

Cited by 19 publications

(14 citation statements)

References 42 publications

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“…By using ground data, those authors calculated k values under different hypothesis and reported a mean k of about 2.21 with 0.07 of variance. On the Southern Great Plains region of USA and using ground and remote sensing data, Venturini et al (2011) obtained a mean value of k = 2.341 with an overall minimum of 1.784 and a maximum of 2.71. Granger (1989) revised the diversity of evapotranspiration equations available at that moment establishing an inequity among them.…”

Section: Methodsmentioning

confidence: 98%

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Water balance of the Salado–Juramento river basin (Argentina)

Venturini

Krepper

2012

Hydrological Processes

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A lumped water balance model was used to derive a monthly water storage series in the Salado–Juramento southern basin, for the period 1954–1986. The evapotranspiration term was estimated using the Bouchet's complementary relationship. Different evapotranspiration formulas following the concepts of potential evapotranspiration and wet environmental evapotranspiration were used. The regional average groundwater levels and the specific yield were used to tune Bouchet's equation. The extrapolation of the water storage series to a secular period (1901–2002) was achieved using a synthetic annual discharge series. The water storage was deficient for most of the century, i.e. more than 60 years; nevertheless in the last 30 years, the system recovers half of the water previously lost. The singular spectral analysis showed that a significant low‐frequency signal is present in the water storage and precipitation series. The main cause of water storage variability would be given by precipitation, in spite of the vast anthropogenic changes on the basin. Anthropogenic effects would be reflected in the river discharges, where no significant signal is detected before 1970; however, an annual signal is insinuated after that year. The conclusions of this work could be different if we only looked at the 1954–1986 period. The results of that period suggest that the basin is primarily accumulating water instead of being mainly in deficit. Thus, here we demonstrated the importance of the secular analysis to illustrate the complete basin behaviour. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 98%

“…On the Southern Great Plains region of USA and using ground and remote sensing data, Venturini et al . () obtained a mean value of k = 2.341 with an overall minimum of 1.784 and a maximum of 2.71.…”

Section: Methodsmentioning

confidence: 99%

Water balance of the Salado–Juramento river basin (Argentina)

Venturini

Krepper

2012

Hydrological Processes

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“…remotely sensed data with MODIS. The comparison between observed and estimated ET values yields errors of about 15% of observed instantaneous ET ( Venturini et al, 2011).…”

Section: Spatial and Temporal Scales Considerationsmentioning

confidence: 99%

“…It can be easily verified that equation (2) is equivalent to equation (1) when  The condition that the slope of the SVP curve equals the psychrometric constant is only true when the temperature is near 6 °C (Granger, 1989b). This has been widely tested (Granger & Gray, 1989;Xu & Singh, 2005;Venturini et al, 2008;Venturini et al, 2011). (1) and (2) can also be written, respectively, as follows,…”

Section: Fig 2 Sketch Of Bouchet´s Complementary Et and Epot Relatimentioning

confidence: 99%

“…They concluded that the appropriate coefficient should be slightly lower than 2. Venturini et al (2008) and Venturini et al (2011) introduced the concept of the relative evaporation, F= ET/Epot, proposed earlier by Granger & Gray (1989), along with P-T equation in both CR models. Thus, Epot is replaced by ET/F and Ew is equated to P-T equation.…”

Section: Bouchet`s Versus Granger`s Complementary Modelsmentioning

confidence: 99%

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Evapotranspiration Estimation Based on the Complementary Relationships

Venturini¹,

Krepper²,

Rodríguez³

2012

Evapotranspiration - Remote Sensing and Modeling

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An improved satellite‐based approach for estimating vapor pressure deficit from MODIS data

Zhang

Niu

et al. 2014

JGR Atmospheres

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Vapor pressure deficit (VPD) is an important variable widely used in ecosystem and climate models. In this paper, an improved satellite-based approach to estimating VPD was presented that uses several remote sensing products coupled with field measured data. The proposed method exploits an optimized algorithm to derive near-surface actual vapor pressure (e a ) from Moderate Resolution Imaging Spectroradiometer (MODIS) data and upgrades Smith's (1966) methodology for estimating e a . The proposed new algorithm for calculating e a was evaluated against in situ measurements at 119 validation sites in China for 2 months in 2013. The mean absolute error (MAE) and root-mean-square error (RMSE) were less than 0.25 kPa and 0.33 kPa, respectively. The near-surface air temperature (T a ), which is an important input data for calculating VPD, was estimated from satellite-retrieved land surface temperature, and had an RMSE of less than 2.5 K. The estimated VPD values were validated with ground observation data from the Heihe River Basin for 5 months in 2012 and for all of China for August 2013. A coefficient of determination (R 2 ) of 0.912, MAE of 0.27 kPa, and RMSE value of 0.32 kPa were achieved for the 2012 test data, and corresponding values of 0.88, 0.278 kPa, and 0.367 kPa for the 2013 test data. These results are promising, especially considering the comparatively high spatial resolution (1 km) of the VPD map estimated from the satellite data. Potential applications include global evapotranspiration estimation, fire warning, and vegetation analysis.

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A comparison among different modified Priestley and Taylor equations to calculate actual evapotranspiration with MODIS data

Cited by 19 publications

References 42 publications

Water balance of the Salado–Juramento river basin (Argentina)

Water balance of the Salado–Juramento river basin (Argentina)

Evapotranspiration Estimation Based on the Complementary Relationships

An improved satellite‐based approach for estimating vapor pressure deficit from MODIS data

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