Discussion
Which asymmetry between hemispheres does this explain?
Answer: A
With major mountain barriers and strong land-sea contrasts, the northern hemisphere supports large stationary waves, while the southern hemisphere flow is far closer to zonally symmetric. This is why blocking is common in the north and rarer in the south, and why the southern polar vortex is stronger and more persistent. The southern jet is in fact the stronger and steadier of the two. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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