Mon Feb 16, F. Flechtner
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Sharifi, Ehsan, Haas, Julian, Boergens, Eva, Dobslaw, Henryk, and Güntner, Andreas, 2025. Technical note: GRACE–compatible filtering of water storage data sets via spatial autocorrelation analysis. Hydrology and Earth System Sciences Discussions, 29(23):6985–6998, doi:10.5194/hess-29-6985-2025.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025HESSD..29.6985S,
author = {{Sharifi}, Ehsan and {Haas}, Julian and {Boergens}, Eva and {Dobslaw}, Henryk and {G{\"u}ntner}, Andreas},
title = "{Technical note: GRACE-compatible filtering of water storage data sets via spatial autocorrelation analysis}",
journal = {Hydrology and Earth System Sciences Discussions},
year = 2025,
month = dec,
volume = {29},
number = {23},
pages = {6985-6998},
abstract = "{Groundwater storage anomaly (GWSA) can be derived on a global scale by
subtracting various water storage compartments (WSCs) such as
soil moisture, snow, surface water bodies, and glaciers from
terrestrial water storage anomaly (TWSA) variations based on the
GRACE/GRACE-FO satellite missions. Due to the nature of data
acquisition by GRACE and GRACE-FO, filtering is essential to
minimize North-South-oriented striping errors, thus resulting in
a spatially smoothed TWSA signal. Nowadays, specific anisotropic
decorrelation filters, such as DDK or VDK (time-variable DDK)
filters, are applied. For a consistent subtraction of the
individual storage compartments from GRACE-based TWSA, they need
to be filtered in a similar way. This study utilized WSCs from
observation-based data products (glaciers, soil moisture, and
snow) and the global hydrological model LISFLOOD (surface water
storage) to determine a suitable filter type over the analysis
period 2002─2023. Analysis revealed that the routinely used
decorrelation filter, e.g. the DDK filter, introduced striping
artefacts into the smoothed data and has consequently been
deemed inappropriate for filtering datasets lacking GRACE-like
correlated error patterns. As an alternative, an isotropic
Gaussian filter was chosen for further analysis. To determine
the optimal filter width, an empirical correlation function was
employed. By minimizing differences between the empirical
spatial correlation functions of aggregated WSCs and the spatial
correlation function of GRACE-based TWSA to a minimum RMSD of
0.02, an optimal filter width of 250 km was identified. This
filter width could be applied to the aggregated WSCs to achieve
a spatial structure similar to GRACE-TWSA, ensuring
compatibility for the subtraction of WSCs from GRACE-TWSA to
isolate groundwater storage.}",
doi = {10.5194/hess-29-6985-2025},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025HESSD..29.6985S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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