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Influence of pacific on Southern Indian ocean Rossby waves

Vaid, BH and Gnanaseelan, C and Polito, PS and Salvekar, PS (2007) Influence of pacific on Southern Indian ocean Rossby waves. Pure and Applied Geophysics, 164 (8-9). pp. 1765-1785.

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Abstract

The sea-surface height anomalies derived from Simple Ocean Data Assimilation (SODA) during 1958-2001, Topex/Poseidon satellite during 1993-2001 and the SODA heat content anomalies (125 m depth) during 1958-2001 are filtered into annual and biennial Rossby wave components using a two-dimensional Finite Impulse Response filter. The filtered Rossby wave components (both annual and biennial) in the southern Pacific and Indian Oceans have considerable strength and variability. The propagation of annual and biennial Rossby waves in the Indonesian through-flow region 12.5°S-7.5°S of the Indian Ocean is in phase with the southern Pacific Ocean waves. So it is speculated that the Pacific Ocean influences the Indian Ocean, especially through the region 17.5°S to 7.5°S and thus the southern Pacific Rossby waves could be an unexplored contributor to the Indian Ocean Rossby waves. We also carried out Fast Fourier Transform (FFT) and wavelet analysis on the tide gauge sea-level data along the Australian coast to support our claim. Filtered annual and biennial components of SODA heat content anomalies (125 m depth) also support these findings.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer
Uncontrolled Keywords: Fourier transform; Rossby wave; sea surface height; throughflow; TOPEX-Poseidon; wave propagation, Indian Ocean; Indian Ocean (South); Pacific Ocean; Pacific Ocean (South)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Feb 2015 23:07
Last Modified: 22 Feb 2015 23:07
URI: http://moeseprints.incois.gov.in/id/eprint/1882

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