Variability of intraseasonal Kelvin waves in the equatorial Pacific Ocean
Toshi Shinoda, Naval Research Lab,Stennis Space Center
Previous observational work has demonstrated that the phase speed of oceanic equatorial Kelvin waves forced by the Madden-Julian oscillation (MJO) appears to vary substantially. Processes that are responsible for systematic changes in the phase speed of these waves are examined using an ocean general circulation model. The model was integrated for 26 years with daily wind stress derived from the NCEP-NCAR reanalysis. The model is able to reproduce observed systematic changes of Kelvin wave phase speed reasonably well, providing a tool for the analysis of their dynamics. The relative importance of the upper ocean background state and atmospheric forcing for phase speed changes is determined based on a series of additional model experiments with various surface forcings.
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