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@ARTICLE{Blunden:911571,
      author       = {Blunden, Jessica and Boyer, Tim and Grooss, Jens-Uwe and
                      Müller, Rolf and Bernhard and Fioletov and Ialongo and
                      Johnsen and Lakkala and Manney, G.},
      title        = {{S}tate of the {C}limate in 2021},
      journal      = {Bulletin of the American Meteorological Society},
      volume       = {103},
      number       = {8},
      issn         = {0003-0007},
      address      = {Boston, Mass.},
      publisher    = {ASM},
      reportid     = {FZJ-2022-04831},
      pages        = {S1 - S465},
      year         = {2022},
      abstract     = {Past emissions of man-made chlorine-containing substances,
                      such as chlorofluorocarbonsCFCs), have caused substantial
                      chemical depletion of stratospheric ozone (WMO 2018). The
                      resulting ozone loss led to increases of ultraviolet (UV)
                      radiation at Earth’s surface with adverse effectsn human
                      health and the environment (Barnes et al. 2019; EEAP 2019).
                      The chemical destruction of polar ozone occurs within a cold
                      stratospheric cyclone known as the polar vortex, whichorms
                      over the North Pole every winter (WMO 2018). The polar
                      vortex between November 2020nd April 2021 was weakened by a
                      Sudden Stratospheric Warming (SSW; see Sidebar 5.2) event
                      inarly January 2021 that decreased depletion of
                      stratospheric ozone in the Northern Hemisphereuntil at least
                      April. A similar SSW event occurred in January 2013. The
                      progressions of chemicalzone loss in the winters of 2012/13
                      and 2020/21 are therefore compared below.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2112},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1175/2022BAMSStateoftheClimate.1},
      url          = {https://juser.fz-juelich.de/record/911571},
}