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000917179 1001_ $$00000-0001-8688-6655$$aYessimbet, Kamilya$$b0$$eCorresponding author
000917179 245__ $$aPathways of Influence Between Northern Hemisphere Blocking and Stratospheric Polar Vortex Variability
000917179 260__ $$aHoboken, NJ$$bWiley$$c2022
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000917179 520__ $$aWe apply a causal inference-based framework to test and quantify previously suggested causalrelationships between Northern Hemisphere blocking, upward wave-activity fluxes and stratospheric polarvortex (SPV) variability using reanalysis data. We show that the influence of blocking on the polar vortex isentirely mediated by upward wave-activity fluxes, as the classical view would suggest. However, the causalpathway is not completely straightforward. In contrast to the vortex-weakening effect of European blocking,the vortex-strengthening effect of west Pacific blocking on lower stratospheric wave-activity fluxes is onlypartially mediated by upper tropospheric wave-activity fluxes. In addition, only two-thirds of the effectof upper tropospheric wave-activity fluxes on polar vortex variability is mediated by lower stratosphericwave-activity fluxes. We also show that sudden stratospheric warmings are not entirely explainable in terms ofupward wave-activity fluxes. These findings help clarify the pathways of influence between blocking and SPVvariability.
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000917179 7001_ $$0P:(DE-Juel1)192332$$aShepherd, Theodore G.$$b1$$ufzj
000917179 7001_ $$00000-0001-5653-4886$$aOssó, Albert C.$$b2
000917179 7001_ $$00000-0003-1201-3303$$aSteiner, Andrea K.$$b3
000917179 773__ $$0PERI:(DE-600)2021599-X$$a10.1029/2022GL100895$$gVol. 49, no. 23$$n23$$pe2022GL100895$$tGeophysical research letters$$v49$$x0094-8276$$y2022
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