Quote:
Originally Posted by redneck
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right now, it may just be a budget constraint.
the models would have to be adjusted for changes in any and all variables which would be different back then.
Feedbacks. total solar irradiance. orbital mechanics. freshwater pulses. Ocean salinity. Density. Currents. Upwellings. Downwellings. Equatorial heat transport. Wind. Sea surface temperature. Vertical deep mixing to 3000-meters. El Nino/ La Nina. Albedo. Evaporation. Aerosols. Cloud condensation nuclei. carbon dioxide, methane, water vapor, CFCs, HFCs, permafrost, glaciers, ice caps, whitecaps, snow cover, vegetation cover, forest cover, rain forest cover, other anthropogenic activities...................
Some past data would not pass muster with today's standards for accuracy. ( solar photometer data for instance )
One general circulation model runs to 36,000-pages of code, if I remember correctly.
It's very expensive directly, requiring man-years of time.