TY - JOUR
T1 - Quantifying uncertainty in a remote sensing-based estimate of evapotranspiration over continental USA
AU - Ferguson, Craig R.
AU - Sheffield, Justin
AU - Wood, Eric F.
AU - Gao, Huilin
PY - 2010/4
Y1 - 2010/4
N2 - We calculate evapotranspiration (E) from remote sensing (RS) data using the Penman-Monteith model over continental USA for four years (2003-2006) and explore, through an ensemble generation framework, the impact of input dataset (meteorological, radiation and vegetation) selection on performance (uncertainty) at the monthly time-scale. The impact of failed or missed RS retrievals and algorithmic assumptions are also quantified. To evaluate bias, we inter-compare RS-E with three independent sources of E: Variable Infiltration Capacity (VIC)model simulated, North American Regional Reanalysis (NARR) inferred, and Gravity Recovery and Climate Experiment (GRACE) inferred. Overall, we find that the choice of vegetation parameterization, followed by surface temperature, has the greatest impact on RS-E uncertainty. Additional uncertainty (4-18%) is linked to sources of net radiation-used to scale instantaneous RS-E under the assumption of constant daytime evaporative fraction-including the Surface Radiation Budget (SRB), International Satellite Cloud Climatology Project (ISCCP), and North American Land Data Assimilation System (NLDAS)-VIC. The ensemble median agrees to within 21% of VIC-modelled E, except for the Colorado and Great Basins for which the need for a soil moisture constraint on RS-E becomes evident.
AB - We calculate evapotranspiration (E) from remote sensing (RS) data using the Penman-Monteith model over continental USA for four years (2003-2006) and explore, through an ensemble generation framework, the impact of input dataset (meteorological, radiation and vegetation) selection on performance (uncertainty) at the monthly time-scale. The impact of failed or missed RS retrievals and algorithmic assumptions are also quantified. To evaluate bias, we inter-compare RS-E with three independent sources of E: Variable Infiltration Capacity (VIC)model simulated, North American Regional Reanalysis (NARR) inferred, and Gravity Recovery and Climate Experiment (GRACE) inferred. Overall, we find that the choice of vegetation parameterization, followed by surface temperature, has the greatest impact on RS-E uncertainty. Additional uncertainty (4-18%) is linked to sources of net radiation-used to scale instantaneous RS-E under the assumption of constant daytime evaporative fraction-including the Surface Radiation Budget (SRB), International Satellite Cloud Climatology Project (ISCCP), and North American Land Data Assimilation System (NLDAS)-VIC. The ensemble median agrees to within 21% of VIC-modelled E, except for the Colorado and Great Basins for which the need for a soil moisture constraint on RS-E becomes evident.
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U2 - 10.1080/01431161.2010.483490
DO - 10.1080/01431161.2010.483490
M3 - Article
SN - 0143-1161
VL - 31
SP - 3821
EP - 3865
JO - International Journal of Remote Sensing
JF - International Journal of Remote Sensing
IS - 14
ER -