Werndl, Charlotte (2017) Initial conditions dependence and initial conditions uncertainty in climate science. [Preprint]
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Abstract
This paper examines initial conditions dependence and initial conditions uncertainty for climate projections and predictions. The first contribution is to provide a clear conceptual characterisation of predictions and projections. Concerning initial conditions dependence, projections are often described as experiments that do not depend on initial conditions. Although prominent, this claim has not been scrutinized much and can be interpreted differently. If interpreted as the claim that projections are not based on estimates of the actual initial conditions of the world or that what makes projections true are conditions in the world, this claim is true.
However, what is often meant is that the simulations used to obtain projections are independent of initial conditions. This paper argues that evidence does not support this claim. Concerning initial conditions uncertainty, three kinds of initial conditions uncertainty are identified (two have received little attention from philosophers so far). The first (the one usually discussed) is the uncertainty associated with the spread of the ensemble simulations. The second arises because the theoretical initial ensemble cannot be used in calculations and has to be approximated by finitely many initial states. The third uncertainty arises because it is unclear how long the model should be run to obtain potential initial conditions at pre-industrial times. Overall, the discussion shows that initial conditions dependence and uncertainty in climate science are more complex and important issues than usually acknowledged.
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| Item Type: | Preprint | ||||||
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| Additional Information: | Forthcoming in: the British Journal for the Philosophy of Science | ||||||
| Keywords: | climate science, initial conditions, uncertainty, projections, predictions | ||||||
| Subjects: | Specific Sciences > Mathematics > Applicability Specific Sciences > Earth Sciences Specific Sciences > Probability/Statistics |
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| Depositing User: | Charlotte Werndl | ||||||
| Date Deposited: | 21 Nov 2017 21:53 | ||||||
| Last Modified: | 21 Nov 2017 21:53 | ||||||
| Item ID: | 14133 | ||||||
| Subjects: | Specific Sciences > Mathematics > Applicability Specific Sciences > Earth Sciences Specific Sciences > Probability/Statistics |
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| Date: | 2017 | ||||||
| URI: | https://philsci-archive.pitt.edu/id/eprint/14133 |
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