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Trends of Coastal Sea Level Between 1993 and 2015: Imprints of Atmospheric Forcing and Oceanic Chaos

  • Thierry PenduffEmail author
  • William Llovel
  • Sally Close
  • Ixetl Garcia-Gomez
  • Stéphanie Leroux
Article
  • 7 Downloads

Abstract

The observation and simulation of the variability of coastal sea level are impacted by various uncertainties, such as measurement errors and sampling biases, unresolved processes, and model and forcing biases. Ocean model simulations suggest that another uncertainty should be taken into account for the attribution of sea-level changes. Global ocean simulations indeed show that resolving mesoscale turbulence (even partly) promotes the emergence of low-frequency (LF) chaotic intrinsic variability (CIV) which causes substantial random fluctuations of sea level up to multiple decades in eddy-active regions of the world ocean. This random LFCIV is superimposed on the atmospherically forced (or simply “forced”) fluctuations, which are directly controlled by the atmospheric variability. We show from a large ensemble of global oceanic hindcasts that this multi-decadal LFCIV leaves a substantial imprint on the long-term trends (1993–2015) of coastal sea level: over 17–20% of the global ocean coastal area, in particular along the coastlines of the northwestern Pacific and Indian Oceans, and around the Gulf of Mexico, random sea-level trends may blur their atmospherically forced counterpart, such that simulated (and potentially observed) coastal sea-level trends cannot be unambiguously attributed to atmospheric or anthropic causes. The steric and manometric sea-level change contributions of these uncertainties are discussed, suggesting that they mostly come from the manometric sea-level trends near the coasts.

Keywords

Sea-level trend Coastal ocean Ensemble modeling Intrinsic variability Detection and attribution 

Notes

Acknowledgements

This work is a contribution to the OCCIPUT and PIRATE projects. PIRATE (https://sealevel.jpl.nasa.gov/science/ostscienceteam/scientistlinks/scientificinvestigations2017/penduff/) is funded by CNES through the Ocean Surface Topography Science Team (OST-ST). OCCIPUT (https://meom-group.github.io/projects/occiput/) was funded by ANR through contract ANR-13-BS06-0007-01. This work was also supported by the French national program LEFE/INSU and has received funding from the European Union Horizon 2020 research and innovation program under grant agreement No 633211. It is also part of the Copernicus Marine Environment Monitoring Service (CMEMS) GLO-HR project; CMEMS is implemented by Mercator Ocean International in the framework of a delegation agreement with the European Union. We acknowledge that the results of this research have been achieved using the PRACE Research Infrastructure resource CURIE based in France at TGCC. William Llovel was supported by C3S program, “Louis Gentil–Jacques Bourcart” fellowship from the French Académie des Sciences and by the OVALIE project from ESA Living Planet Fellowship fundings. The CCI product is freely available at http://www.esa-sealevel-cci.org/. The model dataset used for this study is freely available on http://zenodo.org (http://doi.org/10.5281/zenodo.1487983). We would like to thank two anonymous reviewers for their constructive comments and helpful suggestions.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.CNRS, IRD, Grenoble-INP, Institut des Géosciences de l’Environnement (IGE-MEOM)Université Grenoble AlpesGrenobleFrance
  2. 2.Laboratoire d’Études en Géophysique et Océanographie Spatiales (LEGOS)/CNRS/IRD/CNES/UPS, OMPToulouseFrance
  3. 3.Ocean NextLa Terrasse, GrenobleFrance

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