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Observed variability of the South Pacific westward sea level anomaly signal in the presence of bottom topography

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Maharaj, AM and Cipollini, P and Holbrook, NJ (2005) Observed variability of the South Pacific westward sea level anomaly signal in the presence of bottom topography. Geophysical Research Letters, 32 (L04611). pp. 1-5. ISSN 0094-8276

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Abstract

This study investigates the behavior of westward propagating sea level anomalies across the South Pacific Ocean, with a focus on the long Rossby wave signal determined from filtered TOPEX/Poseidon and ERS satellite altimeter data. An evaluation of the energy variability of the signal using a two-dimensional Radon Transform analysis suggests that Rossby waves interact with both ridges and seamounts at various locations across the basin. Anomalously slow Rossby wave phase speeds are found over steep, isolated bathymetric features in the tropical South Pacific and over the plateau around New Zealand. Interaction with ridges increases the energetic variability, range of dominant propagation speeds, and meridional deviations in the Rossby wave signal.

Item Type: Article
Journal or Publication Title: Geophysical Research Letters
Page Range: pp. 1-5
ISSN: 0094-8276
Identification Number - DOI: 10.1029/2004GL020966
Additional Information: Copyright 2005 by the American Geophysical Union.
Date Deposited: 05 Jul 2008 07:03
Last Modified: 18 Nov 2014 03:44
URI: http://eprints.utas.edu.au/id/eprint/6985
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