Details
| Original language | English |
|---|---|
| Article number | e2022JB024360 |
| Journal | Journal of Geophysical Research: Solid Earth |
| Volume | 127 |
| Issue number | 8 |
| Publication status | Published - 13 Aug 2022 |
| Externally published | Yes |
Abstract
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.
Keywords
- AOD1B RL07, ERA5, GRACE, satellite gravimetry, self-attraction and loading
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
- Earth and Planetary Sciences(all)
- Earth and Planetary Sciences (miscellaneous)
- Earth and Planetary Sciences(all)
- Space and Planetary Science
Sustainable Development Goals
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In: Journal of Geophysical Research: Solid Earth, Vol. 127, No. 8, e2022JB024360, 13.08.2022.
Research output: Contribution to journal › Article › Research › peer review
}
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 -