Mon Oct 13, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Wu, Yunlong, Xiao, Yun, Xu, Chuang, Jian, Guangyu, Xu, Guodong, and Liu, Sulan, 2025. Unveiling North-South stripe patterns in the GRACE gravity field using dimensionality reduction. Geophysical Journal International, 242(2):ggaf235, doi:10.1093/gji/ggaf235.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025GeoJI.242..235W,
author = {{Wu}, Yunlong and {Xiao}, Yun and {Xu}, Chuang and {Jian}, Guangyu and {Xu}, Guodong and {Liu}, Sulan},
title = "{Unveiling North-South stripe patterns in the GRACE gravity field using dimensionality reduction}",
journal = {Geophysical Journal International},
year = 2025,
month = aug,
volume = {242},
number = {2},
eid = {ggaf235},
pages = {ggaf235},
abstract = "{The spherical harmonic coefficient Level-2 products of the Gravity
Recovery and Climate Experiment (GRACE) mission are affected by
north-south stripe noise. Toward this end, we proposed a new
filter named Variational Mode Decomposition spatial (VMDS)
filter that transforms an equivalent water height (EWH) map
derived from GRACE Level-2 product into a 1-D sequence, which is
then filtered by using variational mode decomposition. This
approach overcomes the limitations of the singular spectrum
analysis spatial (SSAS) filter, which performs well in the
medium-frequency band but omits the high-frequency NSS noise.
Integrating the strengths of both, we developed a combined
filter termed SV by placing the VMDS filter behind the SSAS
filter. A closed-loop simulation demonstrates the better ability
of SV to suppress NSS noise and preserve signal at the grid
scale compared to the SSAS filter. In the real-world scenario,
the SV solution achieves a noise level (46.68 mm of EWH) below
that for SSAS and DDK7 solutions (53.52 and 53.68 mm of EWH,
respectively) over the ocean at low latitudes. Moreover, the
well-documented water level of Lake Victoria and the well-
modelled coseismic gravity change of the M$_{w}$9.2 2004
Sumatra-Andaman earthquake demonstrate that the SV filter
efficiently preserves localized mass evolutions while
suppressing north-south stripe noise. Such short-wavelength
signals are usually missed in highly filtered spherical
harmonics (e.g. DDK5 and DDK6) solutions or are significantly
inconsistent for various mass concentration solutions.}",
doi = {10.1093/gji/ggaf235},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025GeoJI.242..235W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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