Thu Aug 14, F. Flechtner
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Loomis, B. D., Sabaka, T. J., Rachlin, K. E., Croteau, M. J., Lemoine, F. G., Nerem, R. S., and Bellas-Manley, A., 2025. Optimized J2 Recovery for Multi-Decadal Geophysical Studies. Geophysical Research Letters, 52(7):2024GL114472, doi:10.1029/2024GL114472.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025GeoRL..5214472L,
author = {{Loomis}, B.~D. and {Sabaka}, T.~J. and {Rachlin}, K.~E. and {Croteau}, M.~J. and {Lemoine}, F.~G. and {Nerem}, R.~S. and {Bellas-Manley}, A.},
title = "{Optimized J2 Recovery for Multi-Decadal Geophysical Studies}",
journal = {\grl},
keywords = {J2, satellite laser ranging, gravity, length of day, GRACE, climate},
year = 2025,
month = apr,
volume = {52},
number = {7},
pages = {2024GL114472},
abstract = "{The time history of the Earth's dynamic oblateness, or ${J}_{2}$, 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
${J}_{2}$ 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 ${J}_{2}$ 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 ${J}_{2}$
without gravity modeling, resulting in the first fully
consistent long-term solution for climate studies.}",
doi = {10.1029/2024GL114472},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025GeoRL..5214472L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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