Journal
CLIMATE RESEARCH
Volume 20, Issue 3, Pages 271-279Publisher
INTER-RESEARCH
DOI: 10.3354/cr020271
Keywords
EOFs; simplification; interpretation; rotation; LASSO; Mediterranean; SST
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Principal component analysis (PCA) is widely used in atmospheric science, and the resulting empirical orthogonal functions (EOFs) are often rotated to aid interpretation. In this paper 3 methods are described which provide alternatives to the standard 2-stage procedure of PCA followed by rotation. The techniques are illustrated on a small example involving sea-surface temperatures in the Mediterranean, Each method is shown to give different simplified interpretations for the major sources of variation in the data set. All 3 techniques have advantages over standard rotation.
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