Assessment of the MODIS global evapotranspiration algorithm using eddy covariance measurements and hydrological modelling in the Rio Grande basin

Ruhoff, Anderson Luís; Paz, Adriano Rolim da; Aragão, Luiz E. O. C.; Mu, Qiaozhen; Malhi, Yadvinder; Collischonn, Walter; Rocha, Humberto Ribeiro da; Running, Steven W.

doi:10.1080/02626667.2013.837578

Cited by 137 publications

(98 citation statements)

References 65 publications

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“…Such findings are in accordance with those obtained from previous studies over China [85,86], the conterminous United States [87], Brazil [88], South Africa [89], and Spain [90]. MOD16 ETa is not constrained explicitly by soil moisture and assumes that water availability can be captured by atmospheric VPD [91,92].…”

Section: Discussionsupporting

confidence: 90%

Monitoring of Evapotranspiration in a Semi-Arid Inland River Basin by Combining Microwave and Optical Remote Sensing Observations

2015

Remote Sensing

115

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Abstract:As a typical inland river basin, Heihe River basin has been experiencing severe water resource competition between different land cover types, especially in the middle stream and downstream areas. Terrestrial actual evapotranspiration (ETa), including evaporation from soil and water surfaces, evaporation of rainfall interception, transpiration of vegetation canopy and sublimation of snow and glaciers, is an important component of the water cycle in the Heihe River basin. We developed a hybrid remotely sensed ETa estimation model named ETMonitor to estimate the daily actual evapotranspiration of the Heihe River basin for the years 2009-2011 at a spatial resolution of 1 km. The model was forced by a variety of biophysical parameters derived from microwave and optical remote sensing observations. The estimated ETa was evaluated using eddy covariance (EC) flux observations at local scale and compared with the annual precipitation and the MODIS ETa product (MOD16) at regional scale. The spatial distribution and the seasonal variation of the estimated ETa were analyzed. The results indicate that the estimated ETa shows reasonable spatial and temporal patterns with respect to the diverse cold and arid landscapes in the upstream, middle stream and downstream regions, and is useful for various applications to improve the rational allocation of water resources in the Heihe River basin. OPEN ACCESSRemote Sens. 2015, 7 3057

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Section: Discussionsupporting

confidence: 90%

Monitoring of Evapotranspiration in a Semi-Arid Inland River Basin by Combining Microwave and Optical Remote Sensing Observations

2015

Remote Sensing

115

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“…This makes Landsat a better option than MODIS when it comes to studying spatially heterogeneous riparian water consumption. The underestimation of MOD16 has been reported for croplands in previous studies [65][66][67]. The MOD16-ET from the CA portion was 34% greater than the AZ areas.…”

Section: Comparisons With Mod16 and Lcrassupporting

confidence: 52%

Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach

2017

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Abstract:The accurate estimation of water use by groundwater-dependent riparian vegetation is of great importance to sustainable water resource management in arid/semi-arid regions. Remote sensing methods can be effective in this regard, as they capture the inherent spatial variability in riparian ecosystems. The single-satellite-scene (SSS) method uses a derivation of the Normalized Difference Vegetation Index (NDVI) from a single space-borne image during the peak growing season and minimal ground-based meteorological data to estimate the annual riparian water use on a distributed basis. This method was applied to a riparian ecosystem dominated by tamarisk along a section of the lower Colorado River in southern California. The results were compared against the estimates of a previously validated remotely sensed energy balance model for the year 2008 at two different spatial scales. A pixel-wide comparison showed good correlation (R 2 = 0.86), with a mean residual error of less than 104 mm·year −1 (18%). This error reduced to less than 95 mm·year −1 (15%) when larger areas were used in comparisons. In addition, the accuracy improved significantly when areas with no and low vegetation cover were excluded from the analysis. The SSS method was then applied to estimate the riparian water use for a 23-year period . The average annual water use over this period was 748 mm·year −1 for the entire study area, with large spatial variability depending on vegetation density. Comparisons with two independent water use estimates showed significant differences. The MODIS evapotranspiration product (MOD16) was 82% smaller, and the crop-coefficient approach employed by the US Bureau of Reclamation was 96% larger, than that from the SSS method on average.

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“…The average ET and EVI values for the wet season were 2.81 ± 0.57 and 0.48 ± 0.05 mm day −1 , and for the dry season 1.70 ± 0.70 and 0.33 ± 0.05 mm day −1 , respectively. The fitted equation considering the periods of calibration, validation and full time series at 16-day averages showed good results in the ET estimates, with a coefficient of determination (R 2 ) greater than 0.70 and standard deviation of differences between observed and estimated ET (SD) and RMSE of less than 0.50 mm day −1 and 21 %, respectively ( Ruhoff et al (2013) with the ET estimated from the product MOD16 . The authors found values of R 2 = 0.61 and RMSE = 0.46 mm day −1 , which were not as good as for the present study results.…”

Section: Modeling Etmentioning

confidence: 91%

The water balance components of undisturbed tropical woodlands in the Brazilian cerrado

Oliveira

Wendland²,

Nearing

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Deforestation of the Brazilian cerrado region has caused major changes in hydrological processes. These changes in water balance components are still poorly understood but are important for making land management decisions in this region. To better understand pre-deforestation conditions, we determined the main components of the water balance for an undisturbed tropical woodland classified as "cerrado sensu stricto denso". We developed an empirical model to estimate actual evapotranspiration (ET) by using flux tower measurements and vegetation conditions inferred from the enhanced vegetation index and reference evapotranspiration. Canopy interception, throughfall, stemflow, surface runoff, and water table level were assessed from ground measurements. We used data from two cerrado sites, Pé de Gigante (PDG) and Instituto Arruda Botelho (IAB). Flux tower data from the PDG site collected from 2001 to 2003 were used to develop the empirical model to estimate ET. The other hydrological processes were measured at the field scale between 2011 and 2014 at the IAB site. The empirical model showed significant agreement (R 2 = 0.73) with observed ET at the daily timescale. The average values of estimated ET at the IAB site ranged from 1.91 to 2.60 mm day −1 for the dry and wet seasons, respectively. Canopy interception ranged from 4 to 20 % and stemflow values were approximately 1 % of the gross precipitation. The average runoff coefficient was less than 1 %, while cerrado deforestation has the potential to increase that amount up to 20-fold. As relatively little excess water runs off (either by surface water or groundwater), the water storage may be estimated by the difference between precipitation and evapotranspiration. Our results provide benchmark values of water balance dynamics in the undisturbed cerrado that will be useful to evaluate past and future land-cover and land-use changes for this region.

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Assessment of the MODIS global evapotranspiration algorithm using eddy covariance measurements and hydrological modelling in the Rio Grande basin

Cited by 137 publications

References 65 publications

Monitoring of Evapotranspiration in a Semi-Arid Inland River Basin by Combining Microwave and Optical Remote Sensing Observations

Monitoring of Evapotranspiration in a Semi-Arid Inland River Basin by Combining Microwave and Optical Remote Sensing Observations

Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach

The water balance components of undisturbed tropical woodlands in the Brazilian cerrado

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