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The Coherence of Small Island Sea Level with the Wider Ocean: a Model Study : Volume 9, Issue 1 (14/02/2013)

By Williams, Joanne

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Book Id: WPLBN0004020633
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: The Coherence of Small Island Sea Level with the Wider Ocean: a Model Study : Volume 9, Issue 1 (14/02/2013)  
Author: Williams, Joanne
Volume: Vol. 9, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hughes, C. W., & Williams, J. (2013). The Coherence of Small Island Sea Level with the Wider Ocean: a Model Study : Volume 9, Issue 1 (14/02/2013). Retrieved from http://kindle.worldlibrary.net/


Description
Description: National Oceanography Centre, 6 Brownlow St, Liverpool L3 5DA, UK. 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.

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

Excerpt
Leuliette, E. W., Nerem, R. S., and Mitchum, G. T.: Calibration of TOPEX}/{POSEIDON and {J}ason altimeter data to construct a continuous record of mean sea level change, Mar. Geod., 27, 79–94, doi:10.1080/01490410490465193, 2004.; Marsh, R., de Cuevas, B. A., Coward, A. C., Jacquin, J., Hirschi, J. J. M., Aksenov, Y., Nurser, A. J. G., and Josey, S. A.: Recent changes in the {N}orth {A}tlantic circulation simulated with eddy-permitting and eddy-resolving ocean models, Ocean Model., 28, 226–239, doi:10.1016/j.ocemod.2009.02.007, 2009.; Vinogradov, S. V. and Ponte, R. M.: Low-frequency variability in coastal sea level from tide gauges and altimetry, J. Geophys. Res., 116, C07006, doi:10.1029/2011JC007034, 2011.; Bingham, R. J. and Hughes, C. W.: The relationship between sea-level and bottom pressure variability in an eddy permitting ocean model, Geophys. Res. Lett., 35, L03602, doi:10.1029/2007GL032662, 2008.; Bingham, R. J. and Hughes, C. W.: Local diagnostics to estimate density-induced sea level variations over topography and along coastlines, J. Geophys. Res.-Oceans, 117, C01013, doi:10.1029/2011JC007276, 2012.; Chelton, D., DeSzoeke, R., Schlax, M., El Naggar, K., and Siwertz, N.: Geographical variability of the first baroclinic {R}ossby radius of deformation, J. Phys. Oceanogr., 28, 433–460, 2.0.CO;2>doi:10.1175/1520-0485(1998)028<0433:GVOTFB>2.0.CO;2, 1998.; Emery, W. J. and Thomson, R. E.: Data Analysis Methods in Physical Oceanography, Elsevier, 2001.; Hughes, C. W. and Williams, S. D. P.: The color of sea level: Importance of spatial variations in spectral shape for assessing the significance of trends, J. Geophys. Res.-Oceans, 115, C10048, doi:10.1029/2010JC006102, 2010.; Vinogradova, N. T., Ponte, R. M., and Stammer, D.: Relation between sea level and bottom pressure and the vertical dependence of oceanic variability, Geophys. Res. Lett., 34, L03608, doi:10.1029/2006GL028588, 2007.; Vignudelli, S., Kostianoy, A., Cipollini, P., and Benveniste, J. (Eds.): Coastal Altimetry, Springer, 1st Edn., 2011.

 

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