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There's long been some debate about whether stratospheric influence is "the tail wagging the dog"- can a region with significantly less mass affect the flow beneath it? However, at this point there have been many very targeted model experiments to isolate the stratospheric influence downward, and it is in fact robust. More details can be found here ( https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020RG000708) or in our post on this blog about how the disturbance at the top of the stratosphere spreads downward towards the troposphere.