Observed data . Reanalysis . Satellite data . Model results  NAO  
NAO signal 
Statistical techniques 
CCA 

The
CCA selects pairs of spatial patterns of two variables
X
&
Y,
such
that their time evolution is optimally correlated (Preisendorfer 1988;
Zorita et al. 1992; Bretherton, 1992; Kharin, 1994; Von Storch 1995).

CCA


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