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On the low-frequency variability in the Indian Ocean


Sakova, IV and Meyers, G and Coleman, R, On the low-frequency variability in the Indian Ocean, Dynamic Planet - Monitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools, 22-26 August 2005, Cairns, Australia, pp. 47-50. ISBN 978-3-540-49349-5 (2006) [Refereed Conference Paper]

Copyright Statement

Copyright 2007 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/978-3-540-49350-1


This paper presents the results of an investigation of low-frequency variability in the Indian Ocean (IO) primarily using satellite altimeter sea surface height (SSH) observations and expendable bathy-thermograph (XBT) data. We found that in most regions of the IO the low-frequency part of the SSH spectra (corresponding to signals with periods of a few months or longer) is concentrated in four frequency bands separated by substantial spectral gaps. These bands correspond to periods of ap-proximately 6 months, 12 months, 18-20 months and more than 30 months (hereafter referred to as the 30-month band). For both 18-20-month and 30-month bands the spectral density shows a dipole-like pattern with some degree of similarity; however, analysis of the spatial-temporal evolution of these signals suggests that the 18-20-month sig-nal is an internal mode of the IO, while that of the 30-month component propagates from the Pacific Ocean, in particular with a much stronger signal during the period from 1998 to 2003.

Item Details

Item Type:Refereed Conference Paper
Keywords:Indian Ocean, ocean variability, IOD
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Coleman, R (Professor Richard Coleman)
ID Code:76058
Year Published:2006
Deposited By:IMAS Research and Education Centre
Deposited On:2012-02-25
Last Modified:2017-01-11

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