NCAR TOY
- February 2008
Method
of Multiple Scale -- Embid and
Majda style.



To avoid secularity
the second order term must be smaller than the leading order term.
Embid, P and Majda, A ÒLow Froude number
limiting dynamics for stably stratified flow
with small or finite Rossby number.Ó Geophysical and Astrophysical Fluid Dynamics, 87 pp 1-50