Mon Dec 15, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Zhao, Yanni, Hoeltgebaum, Lucas Emilio B., Kukal, Meetpal S., and Zhao, Meng, 2025. Leading Satellite-Based Evapotranspiration Products Insufficiently Capture Interannual Variability: Evidence From GRACE/FO and In Situ Observations. Geophysical Research Letters, 52(19):e2025GL116784, doi:10.1029/2025GL116784.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025GeoRL..5216784Z,
author = {{Zhao}, Yanni and {Hoeltgebaum}, Lucas Emilio B. and {Kukal}, Meetpal S. and {Zhao}, Meng},
title = "{Leading Satellite-Based Evapotranspiration Products Insufficiently Capture Interannual Variability: Evidence From GRACE/FO and In Situ Observations}",
journal = {\grl},
keywords = {evapotranspiration, GRACE, GLEAM, OpenET, water balance, AmeriFlux},
year = 2025,
month = oct,
volume = {52},
number = {19},
eid = {e2025GL116784},
pages = {e2025GL116784},
abstract = "{Satellite-based evapotranspiration (ET) products such as OpenET and
GLEAM are widely used for drought monitoring and ecosystem-
climate studies. However, their ability to accurately capture
interannual variability (IAV), a key requirement for such
applications, remains under-evaluated. Here, we assessed IAV in
OpenET and GLEAM using an independent water balance approach
that combined precipitation, discharge, and GRACE/FO total water
storage anomalies across nine river basins in the western United
States. Even after accounting for observational uncertainty
through a Monte Carlo approach, both products systematically
underestimate IAV relative to water balance-based ET, by more
than 60\% on average. This result is further supported by long-
term tower measurements from AmeriFlux. We also demonstrated
that ET sensitivity to climate and vegetation drivers in OpenET
and GLEAM differ substantially from water balance-based
estimates. These findings reveal important limitations in
satellite-based ET products and highlight the need for improved
IAV representation to support ecosystem and climate
applications.}",
doi = {10.1029/2025GL116784},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025GeoRL..5216784Z},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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