¥Minimum 4 main IPCC scenarios (A1, A2, B1, B2), about 20 global
models, 6-member GCM ensemble, 10 regional models, 8 ensemble members per regional
model.
¥4x20x6x10x8 = 38,400 regional climate model runs (or 3,840 runs per
regional model). Not practical!
¥What are the greatest sensitivities in
nested global-regional climate models?
¥How can we most efficiently employ our computer time and (most
important) people?
¥Results from ensemble studies using GCMs
and short-range
forecast models may not apply:
¥Regional climate models are (should be) constrained by lateral boundary
conditions.
¥