A closer look at chaotic advection in the stratosphere: part II: statistical diagnostics

Ngan, K. and Shepherd, T. G. ORCID: https://orcid.org/0000-0002-6631-9968 (1999) A closer look at chaotic advection in the stratosphere: part II: statistical diagnostics. Journal of the Atmospheric Sciences, 56 (24). pp. 4153-4166. ISSN 0022-4928 doi: 10.1175/1520-0469(1999)056<4153:ACLACA>2.0.CO;2

Abstract/Summary

Statistical diagnostics of mixing and transport are computed for a numerical model of forced shallow-water flow on the sphere and a middle-atmosphere general circulation model. In particular, particle dispersion statistics, transport fluxes, Liapunov exponents (probability density functions and ensemble averages), and tracer concentration statistics are considered. It is shown that the behavior of the diagnostics is in accord with that of kinematic chaotic advection models so long as stochasticity is sufficiently weak. Comparisons with random-strain theory are made.