Mon Aug 24, F. Flechtner
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Wei, Na and Feng, Jianhe, 2026. Contribution of GPS horizontal displacements for inferring terrestrial water storage variations in the northwestern United States. Journal of Geodesy, 100(6):40, doi:10.1007/s00190-026-02069-2.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026JGeod.100...40W,
author = {{Wei}, Na and {Feng}, Jianhe},
title = "{Contribution of GPS horizontal displacements for inferring terrestrial water storage variations in the northwestern United States}",
journal = {Journal of Geodesy},
keywords = {Terrestrial water storage, GPS, Seasonal water variation, Regularization method, Three-dimensional displacements, Engineering, Geomatic Engineering},
year = 2026,
month = jun,
volume = {100},
number = {6},
eid = {40},
pages = {40},
abstract = "{Using GPS displacements to infer terrestrial water storage (TWS)
provides an important perspective for water resource monitoring.
However, GPS horizontal displacements with higher precision are
often overlooked in most previous studies. This study
incorporates three-dimensional (3D) GPS displacements to improve
the daily TWS estimates in the Pacific Northwest of the United
States from 2006 to 2021. In the 3D inversion, the conventional
Tikhonov regularization, commonly employed for the vertical-only
inversion, tends to produce overly smooth TWS spatial patterns.
To address this issue, we propose an updated regularization
method. The performance of 3D GPS inversion in capturing the
seasonal TWS variability was evaluated through comparisons with
hydrological models, the Gravity Recovery and Climate Experiment
(GRACE), and in situ water measurements. We further quantify the
contribution of GPS horizontal displacements by comparing 3D and
vertical-only inversion results. Compared with the vertical-only
results, the mean annual amplitude of 3D GPS-inferred TWS
decreases by 17\%, from 161 to 134 mm, bringing it closer to
hydrological model estimates (130 mm). Synthetic experiments
further indicate that vertical-only inversion tends to yield
amplified seasonal TWS amplitudes in this region. In addition,
the 3D GPS-inferred TWS exhibits substantially improved
agreement with in situ observations, with higher correlations at
94\% of snow measurement sites and 76\% of gage height stations.
Therefore, these improvements highlight the critical role of GPS
horizontal displacements in achieving more accurate TWS
estimates.}",
doi = {10.1007/s00190-026-02069-2},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026JGeod.100...40W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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