Technical note: Including non-evaporative fluxes enhances the accuracy of isotope-based soil evaporation estimates.
Saved in:
| Title: | Technical note: Including non-evaporative fluxes enhances the accuracy of isotope-based soil evaporation estimates. |
|---|---|
| Authors: | Fu, Han1 (AUTHOR), Gao, Ming1 (AUTHOR), Li, Huijie2 (AUTHOR), Penna, Daniele3,4 (AUTHOR), Liu, Junming2 (AUTHOR), Si, Bingcheng2,5 (AUTHOR), Zou, Wenxiu1 (AUTHOR) zouwenxiu@iga.ac.cn |
| Source: | Hydrology & Earth System Sciences. 2026, Vol. 30 Issue 7, p1951-1968. 18p. |
| Subject Terms: | *Water storage, *Soil moisture, *Heat flux, *Measurement uncertainty (Statistics), *Isotopic analysis |
| Abstract: | Accurately estimating soil water evaporation is essential for quantifying terrestrial water and energy fluxes. Isotope-based methods are useful but often rely on steady-state (SS) soil water storage assumptions or non-steady-state (NSS) models that ignore non-evaporative fluxes (such as infiltration and transpiration), leading to mass balance errors. Here, we introduce a new framework, named ISONEVA (ISOtope based soil water evaporation estimation considers dynamic soil water storage and Non-EVAporative fluxes), adapted from lake evaporation models to account for both evaporative and non-evaporative fluxes in soils under dynamic soil water storage. Validation under virtual and field scenarios demonstrated that ISONEVA improved evaporation estimates by 24.2 %–79.0 % (virtual) and 57.1 %–79.0 % (field) compared to traditional SS and NSS methods. Furthermore, ISONEVA estimated a plausible upper limit of the E/ET ratio (0.15) in the field test, encompassing the observed value (0.126), whereas SS severely underestimated (0.02) and NSS is unable to estimate E/ET. These results highlight the critical role of dynamic soil water storage and non-evaporative fluxes in isotope-based soil water evaporation estimates. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
Be the first to leave a comment!
