ESS228
Prof. Jin-Yi Yu
Dispersion of Internal Gravity Waves
qPhase
velocity:
qGroup
velocity:
qInternal
gravity waves thus have the remarkable property
that group velocity is perpendicular to the direction
of phase propagation.
mean flow
zonal wavenumber
vertical wavenumber
total wavenumber
qIn
the atmosphere, internal gravity waves generated
in the troposphere by cumulus convection, by flow over topography, and by other
processes may propagate upward many scale heights into the middle atmosphere.
is always smaller than
N!!
(from H.-C. Kuo, National Taiwan Univ.)
Internal gravity waves can
have any frequency between zero
and a maximum value of N.