A practical method to identify displaced and split stratospheric polar vortex events

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Predictability of downward propagation of major sudden stratospheric warmings (2017, background): “Mitchell et al. (2013) and Seviour et al. (2013) classified SSWs as either displacement events, when the polar vortex is pushed away from the Pole, or split events, when the polar vortex is split into two parts, and found that the tropospheric impacts were significantly stronger following the split…”
Defining Sudden Stratospheric Warmings (2015, methodology): “(Seviour et al. 2013), through 2012; dates for 2013–14 have been calculated by A.”
Sudden Stratospheric Warmings (2020, methodology): “Several different methods have been developed to classify split versus displacements (CP07 Lehtonen & Karpechko, 2016; Mitchell et al., 2011; Seviour et al., 2013).”