What Signals Are Removed and Retained by Using an Anomaly Field in Climatic Research?
Figure 4
Logarithm of power spectrum for detrended monthly data. Shown are (a) the spectrums for the original (blue) and anomaly (red) OLR time series and (b) their spectrum difference (original minus anomaly) and (c) the spectrums for the original (blue) and anomaly (red) SST time series and (d) their spectrum difference (original minus anomaly). The monthly OLR time series is calculated in the equatorial western Pacific (120°E–150°E, 5°S-5°N) and the monthly SST time series is in the Nino3 region (150°W–90°W, 5°S-5°N).
