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"Time Variable Earth Gravity Field Models From the First Spaceborne Laser Ranging Interferometer".

N Pie1, S V Bettadpur1, M Tamisiea1

  • 1Center for Space Research (CSR) The University of Texas at Austin Austin TX USA.

Journal of Geophysical Research. Solid Earth
|July 22, 2022
PubMed
Summary
This summary is machine-generated.

The new Laser Ranging Interferometer (LRI) on GRACE-FO satellites matches the accuracy of the older microwave instrument for measuring Earth mass change. LRI data shows high consistency, especially at large scales, promising for future gravity studies.

Keywords:
GRACE‐FOKBRgravity recoveryinter‐satellite ranging systemlaser ranging interferometer

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Area of Science:

  • Earth Science
  • Geophysics
  • Climate Science

Background:

  • The GRACE Follow-On (GRACE-FO) mission continues the GRACE mission's legacy of measuring Earth's mass change.
  • GRACE-FO carries both a microwave interferometer (MWI) and a new Laser Ranging Interferometer (LRI) technology demonstration.

Purpose of the Study:

  • To compare and validate gravity solutions derived from the LRI against those from the MWI.
  • To assess the LRI's performance and potential for future Earth mass change monitoring.

Main Methods:

  • Analysis of GRACE-FO LRI and MWI gravity solutions from January 2019 to September 2020.
  • Comparison of solutions in spatial and spectral domains, focusing on large hydrologic basins and spectral resolution.

Main Results:

  • LRI and MWI gravity solutions show strong general similarity and high consistency at spatial scales of 100,000 km² and above.
  • Differences were observed at higher spectral degrees, with LRI solutions exhibiting lower error in zonal and near-zonal terms.
  • The LRI demonstrated superior stability and fewer reboots compared to the MWI.

Conclusions:

  • LRI observations are capable of recovering time-varying gravity signals with accuracy comparable to MWI-based solutions.
  • The LRI's stability and reliability make it a promising instrument for future Earth gravity field studies.
  • The findings support the use of LRI technology for extending and improving the GRACE data record.