By their approach to use N2O as a tracer of stratospheric transport, the authors are able to separate ozone decrease due to circulation changes from a decrease caused by other, not further detailed reasons. adds important information to the ongoing discussion of this trend, which is being investigated internationally in activities such as SPARC/LOTUS, SPARC/OCTAVE-UTLS or the WMO ozone assessments. An unexpected decline in ozone in the extratropical lower stratosphere over the past two decades is therefore worrying and contrary to the Montreal Protocol's goal of ozone recovery. Stratospheric ozone is important for the energy budget of the planetary atmosphere and for protecting life on Earth from harmful solar UV radiation. Wennberg, Armin Wisthaler, Glenn Wolfe, Caroline Womack, Lu Xu, Robert Yokelson, and Carsten Warneke
Veres, Rebecca Washenfelder, Petter Weibring, Paul O. Tanner, Laura Tomsche, Krystal Vasquez, Patrick R. Schwarz, Kanako Sekimoto, Vanessa Selimovic, Taylor Shingler, David J. Nowak, Demetrios Pagonis, Jeff Peischl, Anne E. Katich, Aaron Lamplugh, Young Ro Lee, Jin Liao, Jakob Lindaas, Stuart A. Hanisco, Reem Hannun, Alan Hills, Gregory Huey, Jose L.
Day, Joshua DiGangi, Glenn Diskin, Alan Fried, Jessica Gilman, Hongyu Guo, Johnathan W.
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