Amalgamations 2 Atmospheric circulation 2 Atmospheric movements 2 Circulation change 2 Circulation patterns 2 Correlation methods 2 Covariance matrix 2 Eigenvalues and eigenfunctions 2 Flow patterns 2 Meteorology 2 Principal component analysis 2 Regionalization 2 S-Mode 2 Synoptic flow patterns 2 T-Mode 2 Teleconnections 2 atmospheric circulation 2 correlation 2 covariance analysis 2 eigenvalue 2 flow pattern 2 methodology 2 principal component analysis 2 teleconnection 2