Dynamical response of equatorial Indian Ocean to intraseasonal winds: Zonal flow

Details Dynamical response of equatorial Indian Ocean to intraseasonal winds: Zonal flow Dynamical response of equatorial Indian Ocean to intraseasonal winds: Zonal flow

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4215h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 22, p. 4215-4218

Physics

28

Oceanography: Physical, Oceanography: Physical: Currents, Oceanography: Physical: Sea Level Variations, Oceanography: Physical: Upper Ocean Processes

Scientific paper

Nonlinear and linear 412-layer ocean models are used to explore the dynamics of intraseasonal (20-90 day periods) zonal flow in the equatorial Indian Ocean. The model simulations suggest that the observed 40-60 day zonal surface current is forced primarily by wind associated with the Madden-Julian Oscillation (MJO), which peaks at 40-60 days. The strongest spectral peak of zonal flow, however, occurs at 90-day period in the model and a corresponding 90-day peak appears in the observed sea level data. The 90-day current results from the preferential excitation of Kelvin and Rossby waves by the lower-frequency component of intraseasonal wind and from the enhancement by Rossby waves reflected from the eastern ocean boundary.

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