Thu Oct 08, F. Flechtner
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Stammer, D., Köhl, A., and Ponte, R. M., 2026. Anatomy of Interannual to Decadal Sea Level Changes in the GECCO3 Ocean Synthesis. Journal of Geophysical Research (Oceans), 131(9):e2026JC024340, doi:10.1029/2026JC024340.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026JGRC..13124340S,
author = {{Stammer}, D. and {K{\"o}hl}, A. and {Ponte}, R.~M.},
title = "{Anatomy of Interannual to Decadal Sea Level Changes in the GECCO3 Ocean Synthesis}",
journal = {Journal of Geophysical Research (Oceans)},
keywords = {sea level decomposition, bottom pressure, steric sea level, ocean data state estimation, climate modeling, deep ocean circulation},
year = 2026,
month = sep,
volume = {131},
number = {9},
eid = {e2026JC024340},
pages = {e2026JC024340},
abstract = "{The GECCO3 synthesis is used to infer a dynamically consistent
decomposition of sea level changes (variability and trends) on
interannual to decadal time scales. Over most parts of the
global ocean equatorward of 60{\textdegree} latitude, sea level
variability and trends can be explained almost completely by the
upper ocean (above 2,000 m) steric component alone. On decadal
and longer time scales, we find strong but negative relations
between the deep steric component (below 2,000 m) and the
manometric changes. Such a relation, albeit weaker, can also be
identified on annual to decadal timescales in the MPI--ESM
climate model. Sea level variability over all shallow shelf
regions (water depth <500 m) and some fraction of the Southern
Ocean appear to be dominated by manometric changes. Enhanced but
short spatial scale manometric contributions exist also in
boundary current regions, such as the North Atlantic or the
Antarctic Circumpolar Current region. Our findings suggest that
without a full depth steric sea level information available,
observed sea level change on decadal and longer time scales
might best be explained by just using the steric estimate
available from the top 2,000 m depth as provided by Argo. Adding
additionally information from the GRACE bottom pressure fields
without knowing the deep steric changes will likely degrade the
decomposition of sea level in many regions of the world ocean.
We encountered large differences between the GECCO3 reanalysis
manometric component and what the GRACE project provides,
suggesting remaining uncertainties to exist in the GRACE ocean
products and/or GECCO3 fields.}",
doi = {10.1029/2026JC024340},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026JGRC..13124340S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Thu Oct 08, F. Flechtner