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  • Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2) x
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Krzysztof Wargan and Lawrence Coy

convergence of the downward branch of the residual circulation as the leading factor in the TIL formation in the middle latitudes during winter. We note that these mechanisms are not necessarily independent: for example, a dynamical change due to wave forcing will also be manifested in the residual circulation. Sudden stratospheric warming (SSW) events are large-scale disturbances of the wintertime polar vortex, characterized by a rapid increase of polar temperatures with a reversal of the 60°–90°N

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