This Demonstration illustrates a mathematical model of atmospheric circulation, represented by the equations:

,

,

,

with initial conditions

,

Here represents time, stands for the strength of the symmetric, globally averaged westerly wind current, and and are the cosine and sine phases of a chain of superposed waves transporting heat toward the poles. and are thermal forcings: is the symmetric cross-latitude heating contrast and accounts for the asymmetric heating contrast between oceans and continents; is the angular frequency. The parameters of interest are the thermal forcings and their angular frequency; the values of the parameters and are set to 20 and 18.

[2] H. Broer, C. Simo, and R. Vitolo, "Bifurcations and Strange Attractors in the Lorenz-84 Climate Model with Seasonal Forcing," NonLinearity, 15(4),2002 pp. 1205–1267. doi:10.1088/0951-7715/15/4/312.