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Ocean Science An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 1
Ocean Sci., 9, 111-119, 2013
https://doi.org/10.5194/os-9-111-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ocean Sci., 9, 111-119, 2013
https://doi.org/10.5194/os-9-111-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Feb 2013

Research article | 14 Feb 2013

The coherence of small island sea level with the wider ocean: a model study

Joanne Williams and Chris W. Hughes Joanne Williams and Chris W. Hughes
  • National Oceanography Centre, 6 Brownlow St, Liverpool L3 5DA, UK

Abstract. Studies comparing tide gauge measurements with sea level from nearby satellite altimetry have shown good agreement for some islands and poor agreement for others, though no explanation has been offered. Using the 1/12° OCCAM ocean model, we investigate the relationship between sea level at small, open-ocean islands and offshore sea level. For every such island or seamount in the model, we compare the shallow-water sea level with the steric and bottom pressure variability in a neighbouring ring of deep water. We find a latitude-dependent range of frequencies for which off-shore sea level is poorly correlated with island sea level. This poor coherence occurs in a spectral region for which steric signals dominate, but are unable to propagate as baroclinic Rossby waves. This mode of decoupling does not arise because of islands bathymetry, as the same decoupling is seen between deep ocean points and surrounding rings.

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