Mon Oct 13, F. Flechtner
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Pandit, Nikeet and Pagiatakis, Spiros, 2025. Advancements in the GRACE and GRACE-FO Gradiometer Mode. Earth and Space Science, 12(5):e2024EA004045, doi:10.1029/2024EA004045.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025ESS...1204045P,
author = {{Pandit}, Nikeet and {Pagiatakis}, Spiros},
title = "{Advancements in the GRACE and GRACE-FO Gradiometer Mode}",
journal = {Earth and Space Science},
keywords = {gravity gradient, GOCE, GRACE},
year = 2025,
month = may,
volume = {12},
number = {5},
eid = {e2024EA004045},
pages = {e2024EA004045},
abstract = "{The global gravitational gradient field has not been observed since the
decommission of GOCE in 2013. Based on the foundational work of
Peidou and Pagiatakis (2019,
https://doi.org/10.1029/2018jb016382), we advance the concept of
GRACE gradiometer mode (GM) for the purpose of using GRACE,
GRACE-FO and future gravity space missions as ``gradiometer
missions.'' Certainly, the GRACE missions have never carried on
board a gradiometer; it is the concept of GM that creates a
fictitious gradiometer system very similar to GOCE, only the
GRACE ``gradiometers'' have long and variable baselines, an
unprecedented paradigm for space-based gravitational gradiometry
that extends the bandwidth of available GOCE gradient solutions.
In this contribution, we develop a new configuration for GM that
views an individual satellite as the ``gradiometer'' by directly
using Level 1A accelerometer measurements at a 10 Hz sampling
rate. We apply the new method in geodynamically active regions
around the globe, and we demonstrate that using GRACE-C as a
``gradiometer'' in the single-satellite gradiometer mode (SS-GM)
produces higher-fidelity gravitational gradient estimates,
clearly delineating tectonic plate boundaries and subduction
zones in the Himalayas and North Africa regions, the Aleutian
trench, the Java trench, and the Peru-Chile trench. Over Canada,
we see the delineation of the Canadian shield, and the effect of
glacial isostatic adjustment is apparent. We also observe well-
known signals resembling terrestrial water storage changes in
Africa, among others, demonstrating the usefulness of the GM for
a wide variety of geoscience applications.}",
doi = {10.1029/2024EA004045},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025E&SS...1204045P},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Oct 13, F. Flechtner