The differences between the individual integrations are entirely due to natural variability and not due to the differences in the model or forcing. The first record is for year 1900 month 1 and the last one is for year 2100 month 12. They have also been linearly interpolated to Northern and Southern Hemisphere polar stereographic grids. Any contribution due to glacier melt is ignored. The user should be aware that grid box values are not directly comparable to station data.
Climate models attempt to represent the full climate system from first principles on large scales.
The user is further cautioned that estimates of climate variability and change obtained from climate model results are subject to sampling variability. This uncertainty arises from the natural variability that is part of the observed climate system and is generally well simulated by the climate models. All STMN data on the web server were corrected on October 30, 1998. We apologize for any inconvenience caused by this problem. We thank Hank Fisher for alerting us to this problem.