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Andreas Dörnbrack, Sonja Gisinger, Michael C. Pitts, Lamont R. Poole, and Marion Maturilli

the Arctic stratospheric vortex were unusually cold ( Fig. 3 ). In November–December 2015, the Arctic vortex was minimally disturbed by upward-propagating planetary waves ( Matthias et al. 2016 ) and the polar cap minimum temperature T MIN between 65° and 90°N dropped well below the climatological mean. The red T MIN line in Fig. 3 reveals that the threshold of T NAT at 50 hPa was already reached at the beginning of December 2015, and T MIN dropped below T FROST at the end of 2015

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