Abstract
A set of mass-weighted zonal mean equations in a pressure–isentrope hybrid vertical coordinate is derived. This formulation is able to present the nonacceleration theorem in ageostrophic and finite-amplitude sense.
* Current affiliation: Geophysical Institute, Graduate School of Science, Tohoku University, Sendai, Japan.
Corresponding author information: Dr. Toshiki Iwasaki, Geophysical Institute, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.