A Space-Time Data Analysis Using Complex Empirical Orthogonal Functions

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  • 複素経験直交関数(CEOF)を用いた時空間データ解析
  • フクソ ケイケン チョッコウ カンスウ CEOF オ モチイタ ジクウカン デ

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The usefulness of complex empirical orthogonal function (EOF) analysis for quasi-periodic propagating phenomena is discussed using the sea surface temperature data in the equatorial Pacific. The features of the complex EOF analysis are as follows:<br> 1) It is easy to interpret physically a propagating phenomenon since it can be explained with a complex eigenmode in the complex EOF analysis. The usual EOF analysis, however, most likely extracts plural eigenmodes for the propagating phenomenon.<br> 2) The complex EOF analysis has the advantage of separating some propagating modes with near frequency domain.<br> 3) Time-space structure of the quasi-periodic propagating mode can be reconstructed by the extracted principal complex eigenmode.<br> This analysis is also compared with the extended EOF analysis.

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