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Interannual variability in the Indian Ocean using altimeter and IX1-expendable bathy-thermograph (XBT) data: Does the 18-month signal exist?

Citation

Sakova, I and Meyers, GA and Coleman, R, Interannual variability in the Indian Ocean using altimeter and IX1-expendable bathy-thermograph (XBT) data: Does the 18-month signal exist?, Geophysical Research Letters, 33, (20) pp. L20603. ISSN 0094-8276 (2006) [Refereed Article]

DOI: doi:10.1029/2006GL027117

Abstract

The dominant frequency bands in altimeter sea surface height (SSH) variability over the whole Indian Ocean and in temperature profiles near the Sumatra-Java coast are identified and analysed using spectral analysis techniques. We find that in most regions of the Indian Ocean, the low-frequency part of the SSH spectra (corresponding to signals with periods from six months to six years) is concentrated in five frequency bands separated by substantial spectral gaps: semi-annual, annual, 18-20 months, 3 years, and 4-6 years. The existence of semi-annual, annual, 2-3-year, and 4-6-year periodical signals is well known; however, the 18-20-month signal has not previously been described. Further investigation of temporal and spatial characteristics of this later signal point to its relationship with the Indian Ocean dipole events: the signal is particularly strong between 1994 and 2000; it develops near the Sumatra coast and propagates to the Bay of Bengal and into the Indonesian Throughflow. Copyright 2006 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Sakova, I (Ms Irina Sakova)
Author:Meyers, GA (Professor Gary Meyers)
Author:Coleman, R (Professor Richard Coleman)
ID Code:40902
Year Published:2006
Web of Science® Times Cited:10
Deposited By:Geography and Environmental Studies
Deposited On:2006-08-01
Last Modified:2011-10-06
Downloads:0

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