  Natural convection is usually complicated by additional factors such as
rotation, shear, radiative transfer, compressibility and electromagnetic fields
(in the case of electro-conductive fluids). It is shown, using results of
numerical simulations and measurements in atmospheric boundary layer and solar
photosphere that strong stratification can transform turbulence into
deterministic chaos with exponential spectral decay of kinetic energy. When the
stratification becomes weaker the deterministic chaos is replaced by the
distributed chaos with stretched exponential spectral decay controlled by the
second or third moments of the helicity distribution.
