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A comparision of low-dimensional representations of sea-surface temperature anomalies in the North Atlantic

✍ Scribed by Thacker, W. C.; Lewandowicz, R.

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
589 KB
Volume
17
Category
Article
ISSN
0899-8418

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✦ Synopsis

Correlation-matrix principal components of North Atlantic sea-surface temperature anomalies for the interval 1950±1970 account for the anomalous variability observed during the interval 1972±1992 better than do similar numbers of covariancematrix principal components, regional averages, or carefully selected local anomalies. When drift in the seasonal cycle is taken into account, local anomalies for 127 6 64 longitude-by-latitude North Atlantic cells could be recovered with an average skill as high as 0Á79. Surprisingly, skill increased monotonically with increasing numbers of principal components, and the maximum value was not obtained until 62 were used to characterize the ®eld. Clearly, far more principal components carry useful information about local details than has been previously suspected.

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