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Yes is the short answer. The Subpolar low is really more of a conceptual thing, where the Westerlies and Polar Easterlies tend to converge. This changes not just with the seasons, but with the movement and propagation of Rossby (long) waves. In this area of convergence, there tends to be lower pressure and sharp temperature contrasts. The Polar Jet sets up at this boundary by definition, because it feeds on these differences in temperature and accelerates up at higher altitudes (200 - 300hPa in meteorological argot). But the Subpolar low is not a discrete unit of low pressure, so I would be careful about simply linking the two.

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