Relationship between summer tropospheric and stratospheric circulations in late winter

Changes in correlations between spring circulation variations in the stratosphere and summer tropospheric circulation in the northern hemisphere from 1950 to 2007. Good correspondence of distributions of correlation coefficients computed from 19581966 observations and NCEP/NCAR Reanalysis data allows us to use the latter ones for investigating the dynamics of correlation fields over long period. Two models of correlation coefficient distributions can be separated. The model A had positive correlation poles above Europe and Eastern Siberia and negative correlation poles above Arctic and Western Siberia. The model B had the positive correlation pole above the Arctic and negative correlation poles above Europe and Eastern Siberia. The model A had been dominating in 1950-1970 and 1980-1995, and the model B - in 1970-1980 and from 1995 up to date.