TY - JOUR

T1 - Non‐Tidal Background Modeling for Satellite Gravimetry Based on Operational ECWMF and ERA5 Reanalysis Data: AOD1B RL07

AU - Shihora, Linus

AU - Balidakis, Kyriakos

AU - Dill, Robert

AU - Dahle, Christoph

AU - Ghobadi‐far, Khosro

AU - Bonin, Jennifer

AU - Dobslaw, Henryk

N1 - Publisher Copyright: © 2022. The Authors.

PY - 2022/8/13

Y1 - 2022/8/13

N2 - The Atmosphere and Ocean De-Aliasing Level-1B (AOD1B) product provides a priori information about temporal variations in the Earth's gravity field induced by non-tidal circulation processes in atmosphere and ocean. It is routinely applied as a background model in the Gravity Recovery and Climate Experiment (GRACE)/GRACE Follow-On (GRACE-FO) satellite gravimetry data processing. We here present three new datasets in preparation for the upcoming release RL07 of AOD1B, that are based on either the global ERA5 reanalysis or the ECMWF operational data together with simulations from the Max-Planck-Institute for Meteorology general circulation model forced consistently with the fields of the same atmospheric data set. The oceanic simulations newly include an updated bathymetry around Antarctica including cavities under the ice shelves, the explicit implementation of the feedback effects of self-attraction and loading to ocean dynamics as well as a refined harmonic tidal analysis. Comparison to the current release of AOD1B in terms of GRACE-FO K-band range-acceleration pre-fit residuals, LRI line-of-sight gravity differences and band-pass filtered altimetry data reveals an overall improvement in the representation of the high-frequency mass variability. Potential benefits of enhancing the temporal resolution remain inconclusive so that the upcoming release 07 will be sampled again every 3 hr.

AB - The Atmosphere and Ocean De-Aliasing Level-1B (AOD1B) product provides a priori information about temporal variations in the Earth's gravity field induced by non-tidal circulation processes in atmosphere and ocean. It is routinely applied as a background model in the Gravity Recovery and Climate Experiment (GRACE)/GRACE Follow-On (GRACE-FO) satellite gravimetry data processing. We here present three new datasets in preparation for the upcoming release RL07 of AOD1B, that are based on either the global ERA5 reanalysis or the ECMWF operational data together with simulations from the Max-Planck-Institute for Meteorology general circulation model forced consistently with the fields of the same atmospheric data set. The oceanic simulations newly include an updated bathymetry around Antarctica including cavities under the ice shelves, the explicit implementation of the feedback effects of self-attraction and loading to ocean dynamics as well as a refined harmonic tidal analysis. Comparison to the current release of AOD1B in terms of GRACE-FO K-band range-acceleration pre-fit residuals, LRI line-of-sight gravity differences and band-pass filtered altimetry data reveals an overall improvement in the representation of the high-frequency mass variability. Potential benefits of enhancing the temporal resolution remain inconclusive so that the upcoming release 07 will be sampled again every 3 hr.

KW - AOD1B RL07

KW - ERA5

KW - GRACE

KW - satellite gravimetry

KW - self-attraction and loading

UR - http://www.scopus.com/inward/record.url?scp=85136902670&partnerID=8YFLogxK

U2 - 10.1029/2022JB024360

DO - 10.1029/2022JB024360

M3 - Article

VL - 127

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 8

M1 - e2022JB024360

ER -