A mechanism for generating ENSO decadal variability

Details A mechanism for generating ENSO decadal variability A mechanism for generating ENSO decadal variability

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1743k&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 12, p. 1743-1746

Physics

150

Global Change, Oceanography: Physical

Scientific paper

A coupled ocean-atmosphere model of the Pacific basin is used to illustrate a mechanism by which El Niño and the Southern Oscillation (ENSO) may be modulated on decadal time scales. For reasonable choices of model parameters, solutions exhibit two types of oscillation, an ENSO-like interannual mode and a decadal one. The decadal mode affects the equatorial zone by means of an oceanic teleconnection that involves transport variations of the North Pacific Subtropical Cell. Since almost half of the cool, thermocline water that upwells in the eastern equatorial Pacific participates in this cell, these variations significantly alter the extent of the cold tongue, and hence provide an efficient mechanism for modulating ENSO.

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