• The Plumb-McEwan experiment: This is a
laboratory counterpart of the QBO (the quasibiennial oscillation of the east-west winds in the
equatorial lower stratosphere).
• The flow in a stratified, non-rotating annulus is
driven away from solid rotation (anti-friction
again) by nothing but the imposition of
fluctuations at an upper or lower boundary.
These are organized by the gravity-wave
propagation mechanism:
Experiment easier with the apparatus upside down:
This is the Kyoto University version of the
Plumb-McEwan experiment:
www.gfd-dennou.org/library/gfd_exp/ or
websearch QBO “Tech Tips”

Plumb-McEwan experiment