抄録
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:
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.
2) The complex EOF analysis has the advantage of separating some propagating modes with near frequency domain.
3) Time-space structure of the quasi-periodic propagating mode can be reconstructed by the extracted principal complex eigenmode.
This analysis is also compared with the extended EOF analysis.
