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The interannual,variability,of the decay,of lower,stratospheric,Arctic vortices,is examined,using NCEP/NCAR re-analyses between,1958 and,2000. There is large interannual,variability,in the charac- teristics of the decay of the vortex air, with very different characteristics for early and late vortex breakups.,In early breakup,years (when,the vortex,breaks,up in February,and,early March) the rem- nants of the vortex survive as coherent potential vorticity structures for around two months, whereas in late breakups,(late April and,May) the potential,vorticity remnants,quickly,disappear. There is a similar contrast in the stirring around the vortex between early and late breakup years, as diagnosed by the lengthening,of material,contours,in contour,advection,calculations. In years with an early breakup,there is a gradual decrease in the stretching rates from large winter to small summer values, whereas in late breakup,years stretching,rates are roughly,constant,until late spring,when,there,is a rapid decrease. These differences,in the decay,of coherent,vortex,structures,and,stirring suggest,that there are large differences,in the mixing,of vortex,air into the surrounding,middle,latitudes,between,years with,early and,late breakups.

Interannual Variability in the Decay of Lower Stratospheric Arctic Vortices.