Modelling the climate of the last millennium: What causes the differences between simulations?

Details Modelling the climate of the last millennium: What causes the differences between simulations? Modelling the climate of the last millennium: What causes the differences between simulations?

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3206710g&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 6, CiteID L06710

Physics

19

Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Paleoclimatology (0473, 4900), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

An ensemble of simulations performed with a coarse resolution 3-D climate model driven by various combinations of external forcing is used to investigate possible causes for differences noticed in two recent simulations of the climate of the past millennium using General Circulation Models (GCMs). Our results strongly suggest that differences in sensitivity (equilibrium and transient climate response) could be responsible for temperature changes that differ by more than a factor of two between two models. In addition, the spin-up procedure could explain some differences between the simulations during the first centuries of the second millennium. The choice of the forcing reconstruction is found to play a smaller role for the differences in the simulated climate, in the model configurations analyzed here. Furthermore, at decadal scale, internal climate variability can mask the differences associated with different forcing reconstructions.

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