Who controls the long-term NAO variability? (original) (raw)

The regionality of climate response to the homogeneous external forcing (i.e. solar variability and enhanced density of greenhouse gases) is one of the challenging frontiers of climate research. A reference to the existing climatic modes, as factors modifying regionally climate changes, simply raises a new question – What are the factors deter- mining internal climatic modes? We have conducted a comparative analysis of NAO and lower stratospheric ozone variability, which reveals their covariance during last century (1900-2010). We show that observed coherence is their spatial-temporal evolution is due to the ozone’s influence on the surface temperature and pressure, which determine the alternating multi-decadal changes of NAO phase. In addition, the factors determining ozone’s centennial variability will be also discussed.