Evaluation of ECOSTRESS evapotranspiration estimates over heterogeneous landscapes in the continental US

Liang，Lili1,2; Feng，Yu1,3; Wu，Jie1,4; He，Xinyue1,5; Liang，Shijing1; Jiang，Xin1; de Oliveira，Gabriel6; Qiu，Jianxiu7; Zeng，Zhenzhong1

2022-10-01

10.1016/j.jhydrol.2022.128470

JOURNAL OF HYDROLOGY   Impact Factor & Quartile

0022-1694

1879-2707

Remote sensing has become a data source long ago for estimating evapotranspiration (ET), but often with a dilemma between temporal and spatial resolution. The recent ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) reaches a satisfactory compromise. It provides 70 m spatial resolution and an average 4-day revisit cycle at different times of a day, making granular analysis of ET in diurnal changes and field-scale a reality. In this study, we assessed one instantaneous ET and two daily ECOSTRESS ET products (ECO3ETPTJPL & ECO3ETALEXI) at site scale, using 31 AmeriFlux towers in six regions spanning the continental US, during the period from July 2018 to September 2021. Assuming that eddy covariance sites within a region share similar climate features, we evaluated the capacity of ECOTSRESS to quantify the ET over heterogeneous landscapes. Generally, DisALEXI-JPL daily ET (R = 0.45) have stronger correlations with in-situ ET than both PT-JPL instantaneous ET (R = 0.23) and daily ET (R = 0.11), while they all tend to overestimate ET in most regions. The diurnal cycles of PT-JPL instantaneous ET and seasonal cycles of two daily ET were visualized site by site; all can show temporal variations of ET. Comparing ECOSTRESS ET across and within the six regions, we found that ECOSTRESS ET accuracy varies by region, regardless of their biomes. Understanding the mechanisms controlling ET and how different data sets are able to capture ET is essential for assessing how land cover changes and human-induced disturbances influence plant water use and stress. In this regard, our study provides a deep evaluation of ECOSTRESS ET, paving the ground for future studies aiming to describe ET across heterogeneous landscapes at a finer scale.

DisALEXI-JPL ECOSTRESS Evaluation Evapotranspiration Heterogeneous landscapes PT-JPL

SCI

English

First ; Corresponding

Southern University of Science and Technology[29/Y01296122];National Natural Science Foundation of China[42071022];

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000866393400004

ELSEVIER

ENGINEERING

2-s2.0-85138484620

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Resources and Environment,Huazhong Agricultural University,Wuhan,China
3.Department of Civil Engineering,The University of Hong Kong,Hong Kong
4.Department of Geoscience and Natural Resource Management,University of Copenhagen,Copenhagen,Denmark
5.School of Earth and Environment,University of Leeds,Leeds,United Kingdom
6.Department of Earth Sciences,University of South Alabama,Mobile,United States
7.Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation,School of Geography and Planning,Sun Yat-Sen University,Guangzhou,510275,China

Liang，Lili,Feng，Yu,Wu，Jie,et al. Evaluation of ECOSTRESS evapotranspiration estimates over heterogeneous landscapes in the continental US[J]. JOURNAL OF HYDROLOGY,2022,613.

Liang，Lili.,Feng，Yu.,Wu，Jie.,He，Xinyue.,Liang，Shijing.,...&Zeng，Zhenzhong.(2022).Evaluation of ECOSTRESS evapotranspiration estimates over heterogeneous landscapes in the continental US.JOURNAL OF HYDROLOGY,613.

Liang，Lili,et al."Evaluation of ECOSTRESS evapotranspiration estimates over heterogeneous landscapes in the continental US".JOURNAL OF HYDROLOGY 613(2022).