Thu Aug 14, F. Flechtner
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Fatolazadeh, Farzam, Wang, Shusen, Eshagh, Mehdi, and Go\"ıta, Kalifa, 2025. Retrieving snow water equivalent from GRACE/GRACE-FO terrestrial water storage anomalies using modified spectral combination theory. Journal of Hydrology, 661:133754, doi:10.1016/j.jhydrol.2025.133754.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025JHyd..66133754F,
author = {{Fatolazadeh}, Farzam and {Wang}, Shusen and {Eshagh}, Mehdi and {Go{\"\i}ta}, Kalifa},
title = "{Retrieving snow water equivalent from GRACE/GRACE-FO terrestrial water storage anomalies using modified spectral combination theory}",
journal = {Journal of Hydrology},
keywords = {Modified spectral combination, GRACE/GRACE-FO, SWE variations, Canadian basins},
year = 2025,
month = nov,
volume = {661},
eid = {133754},
pages = {133754},
abstract = "{Snow Water Equivalent (SWE) refers to the quantity of water contained
within the snowpack, which is a critical component of the
seasonal water cycle in cold regions, notably Canada. The
Gravity Recovery and Climate Experiment (GRACE) mission
primarily focuses on quantifying Terrestrial Water Storage
Anomalies (TWSA), which is the sum of anomalies in groundwater,
soil moisture, surface water, and snow/ice. Separating the
individual components with high precision is a challenging task
due to the complex interactions of these parameters and their
uncertainties involved. This study proposes an enhanced
estimator which is modified based on the spectral combination
theory, to extract the SWE component from GRACE/GRACE-FO
(Follow-On) TWS measurements. This estimator uses a hydrological
model and its uncertainty to optimally extract the SWE component
from the GRACE monthly models in spectral domain. The approach
was applied in eight selected basins across Canada, covering a
diverse range of climatic and geographical conditions. Different
winter seasons of each basin were considered, including the peak
accumulation and ablation phases of the snowpack, from January
2003 to the end of 2022. Among the basins examined, the Fraser-
Lower Mainland and Ottawa basins exhibited the most pronounced
seasonal variations in SWE, with maximum value of about 200 mm.
In contrast, the Saint John-St basin demonstrated the lowest SWE
variability, with maximum amount of 50 mm. All the studied
basins across Canada except for Okanagan-Similkameen basin and
Saint John-St basin displayed a positive trend in SWE. The
results from the proposed approach were compared to the SWE
component derived from Canadian Historical Snow Water Equivalent
dataset (CanSWE), Canadian Meteorological Centre (CMC), and
GlobSnow. Varying levels of agreement were found depending on
the basins (correlations between r = 0.40 and r = 0.83, and RMSE
between 10 mm and 55 mm). The best agreements were found with
CMC and CanSWE products. The inclusion of streamflow component
highlighted the relationship between maximum SWE and the peak
flow. The results found indicate significant correlations
between SWE derived from our modified spectral combination
approach and peak flow in several basins (r varying from 0.42 to
0.80); thus emphasizing the critical role of snowmelt in
influencing peak flows in the basins.}",
doi = {10.1016/j.jhydrol.2025.133754},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025JHyd..66133754F},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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