by K. Richard, Feb 11, 2025 in NoTricksZone
Because the current state-of-the-art general circulation models (GCMs) cannot simulate the trends and variances in global precipitation over the last 84 years (1940-2023), their usefulness should be reconsidered.
Hydrological processes – ocean circulation, water vapor, clouds – are key components of climate, easily overshadowing the impact of anthropogenic CO2 emissions by a factor of 2,100 (Koutsoyiannis, 2021).
The effect that cloud cover variability has on surface temperature is so uncertain, and our cloud-effect measurement capacities are so primitive, even NASA has had to admit that “today’s models must be improved by about a hundredfold in accuracy” to even begin to attribute current or future temperature changes to increases in atmospheric CO2.
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In that vein, a new paper published by Dr. Koutsoyiannis, a hydrologist, statistically assesses the utility of today’s climate models. He documents the general circulation models’ capacity to simulate trends and variability in global (hemispheric) precipitation since 1940.
The results are not encouraging. The best computer models we have cannot accurately simulate what occurs in the real world.
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