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The observed pseudo-periodic reversal of the upper layer circulation of theIonian Sea has been assumed to be related to some internal feedback processes(density driven) by the so called BiOS (Adriatic-Ionian Bimodal OscillatingSystem) hypothesis. The mechanism seems to be very well described by anon-linear oscillator dynamical system. By setting the state variables as thesalinity of Adriatic deep water and the sea level anomaly in the Ionian regiona Van der Pol equation has been obtained. The periodic cycle so obtained is ofthe order of a decade as observed in the data. Furthermore, a periodic term,which mimics the decadal variability of the forcing (mainly atmospheric),produces a period doubling phenomenon which is typical of the forced Van derPol oscillator. By considering also a stochastic gaussian noise acting as aforcing and a decadal periodic input term, having an amplitude much smallerthan the noise variance, a sub-harmonic stochastic resonance appears in thesolution for a certain range of the values of the parameters. This yields thepossibility of a longer time scale variability of the BiOS mechanism.

The theory of non-linear oscillator applied to the BiOS mechanism