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Impact of Biannual Rossby Waves on the Indian Ocean Dipole

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3 Author(s)
Gnanaseelan, C. ; Indian Inst. of Tropical Meteorol., Pune ; Vaid, B.H. ; Polito, P.S.

TOPEX/Poseidon sea surface height anomalies during 1993-2002 are decomposed using 2-D finite impulse response filters which showed biannual Rossby waves (BRWs) in the equatorial Indian Ocean (peak at 1.5degS) and in the southern tropical Indian Ocean (peak at 10.5degS) during Indian Ocean dipole (IOD) years. Anomalous downwelling BRWs in the equatorial Indian Ocean triggered by the wind stress curl-induced Ekman pumping near the eastern boundary started propagating westward from the eastern boundary in July/August 1993 and 1996, i.e., more than one year prior to the formation of the IOD events of 1994 and 1997 respectively. These strong downwelling signals reach the western equatorial Indian Ocean during the peak dipole time.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:5 ,  Issue: 3 )

Date of Publication:

July 2008

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