Comparison of the amplitude ratios between observations and the S96 model.
The observed ratio (black) is about 4 in the east-central Pacific, indicating
a strong dominance of 1 cpy variability. The modeled ratio (green) is nearly
constant at about 1.27, indicating only slightly larger 1 cpy amplitude. The
red and blue curves show the standard deviation of observed and modeled SST,
respectively, and should be equal in the "heat storage limit" of S96.
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