Magnusdottir, G., R. Saravanan and C. Deser, 2003: The modelled response of the atmospheric winter circulation to North Atlantic SST and sea -
ice anomalies corresponding to multidecadal trends.
The global temperature
anomaly certainly shows an increase since systematic thermometer records began in the tail end of the period of extreme cold known as the «little
ice age», but just as in the medieval warming period, local temperature series need not
correspond to the global trend.