GREENHOUSE WARMING AND CHANGES IN THE SEASONAL CYCLE OF TEMPERATURE -MODEL VERSUS OBSERVATIONS

Thomson [1995] argues that an enhanced greenhouse effect may be alteri ng the seasonal cycle in temperature. We compare trends in the amplitu de and phase of the seasonal cycle in observational temperature data i n the northern hemisphere with the response of two general circulation models to increased CO2 concentrations. Sizeable amplitude decreases are observed in both models and observations. Significant phase delays tie, later seasonal transitions) are found in the simulations, opposi te to the phase advances isolated in the observations. The retreat of winter sea ice in high-latitude regions appears to explain the models' response to CO2 increase. Much of the variability in the observationa l data is not predicted by the models.