Discussion
Which dramatic event results from planetary wave breaking in the stratosphere?
Answer: D
Breaking planetary waves decelerate and sometimes reverse the winter polar vortex, driving descent over the pole and temperature rises of tens of kelvin within a few days. Major warmings occur roughly every other winter in the northern hemisphere. The ozone hole is a chemical phenomenon, and the quasi-biennial and semi-annual oscillations are driven by equatorial waves of much shorter wavelength. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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