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Perturb

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2	2	=== Why? ===
3	3	Simulations in LMDZOR start with a prescribed atmospheric temperature. This initial temperature is estimated in the ELI experiment. The model results are rather sensitive to the initial conditions. However, the initial condition does not account for the specifics of the land surface. Therefore, one could reason that the initial conditions estimated during the ELI experiment are just one possible realisation from a population of initial conditions. The sensitivity of the model result to the initial conditions can then be tested by running the model for a (small) population of slightly different initial conditions. Such runs could be used as a sensitivity test but they could likewise be used as a proxy for the uncertainty on the simulated climate variables.
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	5	This approach has been used by for example Fischer et al. 2013. DOI: 10.1038/NCLIMATE2051 (see Methods, Model experiment).
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5	7	=== How? ===