Verification of a GCM entails simulating past climates, comparing the simulation with the actual conditions that occurred, and adjusting the GCM to minimize the differences.
Observed global average temperature changes versus simulations via the HadGEM1 GCM assuming only natural forcing factors, human factors, or the sum of the two. The gray band denotes the uncertainty of the GCM simulation. The baseline is the average for the whole period.
Bloom (2010) Global Climate Change: Convergence of Disciplines, Sinauer Assoc.
Testing Global Climate ModelsLast Updated on 2012-05-07 at 18:55
If we are given values for the past, present, and projected future of greenhouse gases, we can derive the total of all climatic forcing factors, and run global climate models... More »
Future global sea level riseLast Updated on 2012-03-24 at 11:41
The current trajectory for the 21st century global rise of sea level is 2 to 3 feet due to warming of the oceans, partial melting of mountain glaciers and partial melting of... More »