Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-2633-2010 http://www.atmos-chem-phys-discuss.net/10/2633/2010/ http://www.atmos-chem-phys-discuss.net/10/2633/2010/acpd-10-2633-2010.html http://www.atmos-chem-phys-discuss.net/10/2633/2010/acpd-10-2633-2010.pdf 2633 2668 2010-02-03 Long-term trends in the middle atmosphere dynamics at northern middle latitudes – one regime or two different regimes? J. Lastovicka jla@ufa.cas.cz P. Krizan M. Kozubek Institute of Atmospheric Physics of ASCR, Bocni II, 14131 Prague, Czech Republic Due to increasing atmospheric concentration of greenhouse gases and changing stratospheric ozone concentration, both of anthropogenic origin, various quantities in the middle atmosphere reveal long-term changes and trends. Lastovicka and Krizan (2006) indicated possibility of change of trends in the dynamics in the northern midlatitude middle atmosphere as a whole in the 1990s. 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