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Influence of El Nino and Indian Ocean Dipole on sea level variability in the Bay of Bengal

Sreenivas, P and Gnanaseelan, C and Prasad, KVSR (2012) Influence of El Nino and Indian Ocean Dipole on sea level variability in the Bay of Bengal. Global and Planetary Change, 80-81. pp. 215-225.

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Zonally oscillating seasonal equatorial winds generate pairs of upwelling and downwelling Kelvin waves in the Equatorial Indian Ocean, which then advance in to the coastal Bay of Bengal. The first (second) equatorial upwelling Kelvin wave has its origin in the western (eastern) basin, whereas the downwelling Kelvin waves originate in the central basin. The observed interannual variability of these Kelvin waves is highly governed by the associated zonal wind changes in the central and eastern equatorial Indian Ocean during the anomalous years. The second downwelling (upwelling) Kelvin wave is absent (weak) during El Niño (La Niña) years, whereas the second upwelling Kelvin wave strengthened during El Niño years both in the equatorial Indian Ocean and Bay of Bengal. The large scale off equatorial Rossby waves occasionally feedback the equatorial Kelvin waves, which then strengthen the Bay of Bengal coastal Kelvin waves. The coastal Kelvin waves and the associated radiated Rossby waves from east play a dominant role in the mesoscale eddy generation in Bay of Bengal. The analysis of cyclogenesis characteristics in the bay over the past 65. years revealed that the active (suppressed) phases of cyclogenesis are coinciding with the downwelling (upwelling) planetary waves which influence the cyclone heat potential by altering the thermocline depth.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Cyclogenesis; ENSO; Interannual variability; IOD; Mesoscale eddy; Planetary Waves, Climate change; Coastal zones; Nickel compounds; Ocean currents; Sea level; Storms, Gravity waves, air-sea interaction; annual variation; cyclogenesis; cyclone; downwelling; El Nino; Kelvin wave; mesoscale eddy; planetary wave; Rossby wave; sea level change; sea surface temperature; seasonality; thermocline; upwelling, Bay of Bengal; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 28 Dec 2013 19:48
Last Modified: 28 Dec 2013 19:48

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