Influence of Pacific on Southern Indian Ocean Rossby Waves |
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Authors: | B H Vaid C Gnanaseelan P S Polito P S Salvekar |
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Institution: | 1. Indian Institute of Tropical Meteorology, Pune, 411008, India 2. Department of Meteorology, Florida State University, Tallahassee, FL, 32306 3. Instituto Oceanográfico da Universidade de S?o Paulo (IOUSP), Brazil
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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. |
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Keywords: | Variability Rossby waves Indonesian through-flow |
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