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Estimating Regional Evapotranspiration Using a Satellite-Based Wind Speed Avoiding Priestley–Taylor Approach.
- Source :
- Water (20734441); Nov2021, Vol. 13 Issue 21, p3144, 1p
- Publication Year :
- 2021
-
Abstract
- Wind speed (u) is a significant constraint in the evapotranspiration modeling over the highly heterogeneous regional surface due to its high temporal-spatial variation. In this study, a satellite-based Wind Speed Avoiding Priestley–Taylor (WAPT) algorithm was proposed to estimate the regional actual evapotranspiration by employing a u-independent theoretical trapezoidal space to determine the pixel Priestley–Taylor (PT) parameter Φ. The WAPT model was comprehensively evaluated with hydro-meteorological observations in the arid Heihe River Basin in northwestern China. The results show that the WAPT model can provide reliable latent heat flux estimations with the root-mean-square error (RMSE) of 46.0 W/m<superscript>2</superscript> across 2013–2018 for 5 long-term observation stations and the RMSE of 49.6 W/m<superscript>2</superscript> in the growing season in 2012 for 21 stations with intensive observations. The estimation by WAPT has a higher precision in the vegetation growing season than in the non-growing season. The estimation by WAPT has a closer agreement with the ground observations for vegetation-covered surfaces (e.g., corn and wetland) than that for dry sites (e.g., Gobi, desert, and desert steppe). [ABSTRACT FROM AUTHOR]
- Subjects :
- WIND speed
EVAPOTRANSPIRATION
GROWING season
LATENT heat
HEAT flux
Subjects
Details
- Language :
- English
- ISSN :
- 20734441
- Volume :
- 13
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Water (20734441)
- Publication Type :
- Academic Journal
- Accession number :
- 153595063
- Full Text :
- https://doi.org/10.3390/w13213144