Thu Aug 14, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Zhang, Xuanze, Ren, Chanyue, Wang, Zhonglei, Li, Xiaojie, and Zhang, Yongqiang, 2025. Gap-filling GRACE and GRACE-FO data with a climate adjustment scheme using Singular Spectrum analysis. Journal of Hydrology, 653:132782, doi:10.1016/j.jhydrol.2025.132782.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025JHyd..65332782Z,
author = {{Zhang}, Xuanze and {Ren}, Chanyue and {Wang}, Zhonglei and {Li}, Xiaojie and {Zhang}, Yongqiang},
title = "{Gap-filling GRACE and GRACE-FO data with a climate adjustment scheme using Singular Spectrum analysis}",
journal = {Journal of Hydrology},
keywords = {GRACE, GRACE-FO, Gap filling, Terrestrial water storage anomaly, SPEI, SSA},
year = 2025,
month = jun,
volume = {653},
eid = {132782},
pages = {132782},
abstract = "{The satellite missions of Gravity Recovery and Climate Experiment
(GRACE) and its follow-on (GRACE-FO) have provided two decades'
observations for global hydrological cycle and climate change
communities. However, there exists 33-month data gaps,
especially the 11-month gap during 2017{\textendash}2018 within
the missions, introducing significant biases and uncertainties
in monitoring long-term trends and identifying extreme events
from GRACE-based terrestrial water storage anomaly (TWSA).
Although previous efforts to fill these gaps, a global gap-
filled product that fulfills increasing desirable accuracy is
still lacking. Here, we propose a novel approach to fill in the
global TWSA data gap with climate adjustment scheme using
Singular Spectrum Analysis (climSSA) together with the climate
drought index (SPEI-6) as input. The climSSA has significantly
increased the representation of sub-seasonal and inter-annual
signals in TWSA relative to traditional SSA. Cross-validation
analysis for a 24-month testing period suggests that the Nash-
Sutcliffe Efficiency values between climSSA and GRACE-FO are
significantly positive ({\ensuremath{\geq}}0.3) in > 90 \%
global land and larger than 0.8 in > 50 \% global land. Its
performance remains steady after removing the contribution from
seasonal cycles, and is similar to or better than three recent
products and geodetic satellite laser ranging (SLR) satellites-
derived data. Our approach suggests the merit of using climate
drought index in reconstructing a long-term GRACE-like TWSA over
the GRACE-gap and pre-GRACE periods.}",
doi = {10.1016/j.jhydrol.2025.132782},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025JHyd..65332782Z},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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