Sea-level fingerprints emergent from GRACE mission data
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Published:2019-05-09
Issue:2
Volume:11
Page:629-646
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
Adhikari SurendraORCID, Ivins Erik R.ORCID, Frederikse ThomasORCID, Landerer Felix W., Caron Lambert
Abstract
Abstract. The Gravity Recovery and Climate Experiment (GRACE) mission data have an
important, if not revolutionary, impact on how scientists quantify the water
transport on the Earth's surface. The transport phenomena include land
hydrology, physical oceanography, atmospheric moisture flux, and global
cryospheric mass balance. The mass transport observed by the satellite system
also includes solid Earth motions caused by, for example, great subduction
zone earthquakes and glacial isostatic adjustment (GIA) processes. When
coupled with altimetry, these space gravimetry data provide a powerful
framework for studying climate-related changes on decadal timescales, such as
ice mass loss and sea-level rise. As the changes in the latter are
significant over the past two decades, there is a concomitant self-attraction
and loading phenomenon generating ancillary changes in gravity, sea surface,
and solid Earth deformation. These generate a finite signal in GRACE and
ocean altimetry, and it may often be desirable to isolate and remove them for
the purpose of understanding, for example, ocean circulation changes and
post-seismic viscoelastic mantle flow, or GIA, occurring beneath the
seafloor. Here we perform a systematic calculation of sea-level fingerprints
of on-land water mass changes using monthly Release-06 GRACE Level-2 Stokes
coefficients for the span April 2002 to August 2016, which result in a set of
solutions for the time-varying geoid, sea-surface height, and vertical
bedrock motion. We provide both spherical harmonic coefficients and spatial
maps of these global field variables and uncertainties therein
(https://doi.org/10.7910/DVN/8UC8IR; Adhikari et al., 2019). Solutions are provided
for three official GRACE data processing centers, namely the University of
Texas Austin's Center for Space Research (CSR), GeoForschungsZentrum Potsdam
(GFZ), and Jet Propulsion Laboratory (JPL), with and without rotational
feedback included and in both the center-of-mass and center-of-figure
reference frames. These data may be applied for either study of the fields
themselves or as fundamental filter components for the analysis of
ocean-circulation- and earthquake-related fields or for improving ocean tide
models.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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