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A Vertical-mode Decomposition to Investigate Low-frequency Internal Motion Across the Atlantic at 26° N : Volume 8, Issue 5 (05/10/2011)

By Szuts, Z. B.

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Book Id: WPLBN0003988080
Format Type: PDF Article :
File Size: Pages 54
Reproduction Date: 2015

Title: A Vertical-mode Decomposition to Investigate Low-frequency Internal Motion Across the Atlantic at 26° N : Volume 8, Issue 5 (05/10/2011)  
Author: Szuts, Z. B.
Volume: Vol. 8, Issue 5
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Marotzke, J., Chidichimo, M. P., Blundell, J. R., & Szuts, Z. B. (2011). A Vertical-mode Decomposition to Investigate Low-frequency Internal Motion Across the Atlantic at 26° N : Volume 8, Issue 5 (05/10/2011). Retrieved from

Description: Max-Planck-Institut für Meteorologie, Hamburg, Germany. Hydrographic data from full-depth moorings maintained by the RAPID/MOCHA project that span the Atlantic at 26° N are decomposed into vertical modes, in order to give a dynamical framework for interpreting the observed fluctuations. Vertical modes at each mooring are fit to pressure perturbations using a Gauss-Markov inversion. Away from boundaries, the vertical structure is almost entirely described by the first baroclinic mode, as confirmed by high correlation between the original signal and reconstructions using only the first baroclinic mode. These first baroclinic motions are also highly coherent with altimetric sea surface height (SSH). On both the western and eastern boundaries, however, the decomposition contains significant variance at higher modes, and there is a corresponding decrease in the agreement between SSH and either the original signal or the first baroclinic mode reconstruction. At the boundaries, the transport fluctuations described by the first baroclinic mode represent less than 10% of the variance of the full transport signal. At the eastern boundary, a linear combination of many baroclinic modes is required to explain the observed vertical density profile of the seasonal cycle, a result that is consistent with the oceanic response to wind-forcing not propagating far from the eastern boundary.

A vertical-mode decomposition to investigate low-frequency internal motion across the Atlantic at 26° N

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