Fig.3. The power spectrum of the observation,CMIP5 and CMIP6 (a) AMO;(b) PDO; The purple line is the observation data,the blue line is the MME of CMIP5,the red line is the MME of CMIP6,the higher black dotted line is the 95% test line,the lower black dotted line is the red noise line,and the vertical dotted line is the standard deviation between models
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