Optimized J2 Recovery for Multi‐Decadal Geophysical Studies
Abstract The time history of the Earth's dynamic oblateness, or J2, is a unique climate data record, with its estimation from satellite laser ranging (SLR) tracking data beginning in 1976. Due to its impact on variations in length of day (LOD), the long‐term J2 time series is frequently applied...
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| Format: | Article |
| Language: | English |
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Wiley
2025-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL114472 |
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| author | B. D. Loomis T. J. Sabaka K. E. Rachlin M. J. Croteau F. G. Lemoine R. S. Nerem A. Bellas‐Manley |
| author_facet | B. D. Loomis T. J. Sabaka K. E. Rachlin M. J. Croteau F. G. Lemoine R. S. Nerem A. Bellas‐Manley |
| author_sort | B. D. Loomis |
| collection | DOAJ |
| description | Abstract The time history of the Earth's dynamic oblateness, or J2, is a unique climate data record, with its estimation from satellite laser ranging (SLR) tracking data beginning in 1976. Due to its impact on variations in length of day (LOD), the long‐term J2 time series is frequently applied to LOD studies and their contributions, which include tidal friction, glacial isostatic adjustment, ice melt, sea level change, and the angular momentum exchange between the fluid outer core and the mantle. Previous studies demonstrated that the accurate recovery of J2 requires the use of time variable gravity models from GRACE when processing the SLR tracking data. However, no reliable models exist prior to GRACE's 2002 launch, calling into to question the accuracy and utility of the pre‐GRACE estimates. Here we present a new approach to accurately recover J2 without gravity modeling, resulting in the first fully consistent long‐term solution for climate studies. |
| format | Article |
| id | doaj-art-15495a0eb3754a98a9bcbb62e3fd9020 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-15495a0eb3754a98a9bcbb62e3fd90202025-08-20T03:49:45ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01527n/an/a10.1029/2024GL114472Optimized J2 Recovery for Multi‐Decadal Geophysical StudiesB. D. Loomis0T. J. Sabaka1K. E. Rachlin2M. J. Croteau3F. G. Lemoine4R. S. Nerem5A. Bellas‐Manley6Geodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USAGeodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USAKBRwyle Greenbelt MD USAGeodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USAGeodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USAUniversity of Colorado Boulder CO USAUniversity of Colorado Boulder CO USAAbstract The time history of the Earth's dynamic oblateness, or J2, is a unique climate data record, with its estimation from satellite laser ranging (SLR) tracking data beginning in 1976. Due to its impact on variations in length of day (LOD), the long‐term J2 time series is frequently applied to LOD studies and their contributions, which include tidal friction, glacial isostatic adjustment, ice melt, sea level change, and the angular momentum exchange between the fluid outer core and the mantle. Previous studies demonstrated that the accurate recovery of J2 requires the use of time variable gravity models from GRACE when processing the SLR tracking data. However, no reliable models exist prior to GRACE's 2002 launch, calling into to question the accuracy and utility of the pre‐GRACE estimates. Here we present a new approach to accurately recover J2 without gravity modeling, resulting in the first fully consistent long‐term solution for climate studies.https://doi.org/10.1029/2024GL114472J2satellite laser ranginggravitylength of dayGRACEclimate |
| spellingShingle | B. D. Loomis T. J. Sabaka K. E. Rachlin M. J. Croteau F. G. Lemoine R. S. Nerem A. Bellas‐Manley Optimized J2 Recovery for Multi‐Decadal Geophysical Studies Geophysical Research Letters J2 satellite laser ranging gravity length of day GRACE climate |
| title | Optimized J2 Recovery for Multi‐Decadal Geophysical Studies |
| title_full | Optimized J2 Recovery for Multi‐Decadal Geophysical Studies |
| title_fullStr | Optimized J2 Recovery for Multi‐Decadal Geophysical Studies |
| title_full_unstemmed | Optimized J2 Recovery for Multi‐Decadal Geophysical Studies |
| title_short | Optimized J2 Recovery for Multi‐Decadal Geophysical Studies |
| title_sort | optimized j2 recovery for multi decadal geophysical studies |
| topic | J2 satellite laser ranging gravity length of day GRACE climate |
| url | https://doi.org/10.1029/2024GL114472 |
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