Calculating modulations

BS B. H. Samset
CZ C. Zhou
JF J. S. Fuglestvedt
ML M. T. Lund
JM J. Marotzke
MZ M. D. Zelinka
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GSTA modulations are calculated by multiplying the GF for that month with the detrended SST pattern from HadCRUT5 or a climate model. See Fig. 1. The total modulation is the sum of the contributions from all ocean-dominated grid points. Note that for this sum to be correctly defined, calculations must be done in the native resolution of the GF. Hence, both observed and model temperature fields have been regridded to this resolution (2.5° latitude, 1.9° longitude).

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