The method to classify circulation patterns is obliquely rotated Principal Components in T-mode (PCT) because of its temporal and spatial stability (Huth, 1996a, Huth, 1996b). In T-mode, the grid point values are arranged in rows and daily patterns in columns. The classification was done in cost733 software, which has been developed in several variants (Philipp et al., 2016), especially for classifications.
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