Resonant triad interaction on an extended equatorial β-plane
نویسندگان
چکیده
The usual equatorial β-plane supports a range of wave types, including trapped baroclinic Rossby waves, a Yanai wave and a Kelvin wave, which are known to be important in equatorial wave dynamics, both linear and nonlinear. Here, we extend this model to the whole sphere, using a Mercator projection, in which the Coriolis parameter is retained in full, but the metric coefficients are approximated by their values at the equator. We find that while the trapped baroclinic waves are preserved in this model, the barotropic waves are also trapped, with consequences for nonlinear resonant triad interactions.
منابع مشابه
Resonant triad interactions on an extended equatorial β-plane
Linear equatorial wave theory (Matsuno, 1966) has shown that equatorially trapped waves (particularly Rossby and Kelvin waves) are important waves in determining large scale climatic processes such as the El Niño-Southern Oscillation (ENSO; e.g. Philander, 1990; Clarke, 2008). Other factors that determine properties like ENSO periodicity and strength are stochastic processes (Kleeman, 2008). Th...
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