PREDICTED AND OBSERVED LONG NIGHT AND DAY TEMPERATURE TRENDS

We performed a principal component analysis of observed winter and sum mer temperature north and south of 55 degrees latitude, in order to ex amine the spatial and temporal history of long day and night temperatu res, We used the component weightings calculated from the observed rec ord to calculate an analogous set of component scores from an infrared -transient coupled ocean-atmosphere general circulation model (GCM). W e found no evidence for the increase in the observed night temperature s that is observed at lower latitudes. Comparison of the observed and GCM-calculated climate revealed that in only one of forty possible com ponents were the patterns of observed and calculated climate change si milar. This behavior is disturbing, because it is at these latitudes t hat the greatest climatic changes have been predicted to have already occurred.