Abstract
I examine error diagnosis (model-model disagreement) in climate model intercomparisons including its difficulties, fruitful examples, and prospects for streamlining error diagnosis. I suggest that features of climate model intercomparisons pose a more significant challenge for error diagnosis than do features of individual model construction and complexity. Such features of intercomparisons include, e.g., the number of models involved, how models from different institutions interrelate, and what scientists know about each model. By considering numerous examples in the climate modeling literature, I distill general strategies (e.g., employing physical reasoning and using dimension reduction techniques) used to diagnose model error. Based on these examples, I argue that an error repertoire could be beneficial for improving error diagnosis in climate modeling, although constructing one faces several difficulties. Finally, I suggest that the practice of error diagnosis demonstrates that scientists have a tacit-yet-working understanding of their models which has been under-appreciated by some philosophers.
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Notes
The examples (and my emphasis in this paper) are focused on multi-model disagreement. For work centered on model-observation discrepancies, including examples of models being used to correct errors in observational and other data, see Lloyd (2012), Abraham et al. (2013), Mann (2018), Weart (2020), and Li (2022).
By “tacit” I have in mind a sort of practice-based knowledge which scientists could perhaps explain to others if pressed but which they typically do not explain to others. Thanks to Matthew Mayernik for prompting me to clarify my use of this term and for pointing me to the work of Schmidt (2012) who discusses how, in many scientific and academic contexts, “tacit” is a “conceptual muddle that mystifies the very concept of practical knowledge” (163).
Lenhard and Winsberg seem to use “sub-model” and “module” interchangeably. In contrast, I adopt climate scientists’ typical usage of these terms, except when directly quoting Lenhard and Winsberg. Effectively this means that sub-models are parameterizations or sub-parameterizations, and the term “modules” is (usually, but not always) reserved for larger pieces of a GCM such as the atmosphere module or ocean module.
Compare with Morrison (2021). Lenhard and Winsberg’s description of model development appears reasonable but may not be accurate to practice.
But see Morrison (2021) for a practice-informed study of how climate modelers prioritize, research, and implement updates to their model over the course of development. Also, large-scale rewrites of GCM code are sometimes done in practice, contrary to Lenhard and Winsberg’s description of climate model development (e.g., see Neale et al., 2012).
Here “attribution” refers to attributing the sources of success and failure in climate models to sub-components of those models. This should not be confused with detection and attribution work in climate science.
Lenhard and Winsberg’s account also implies that scientists cannot attribute sources of model success, however, that is the topic for another paper.
Thank you to an anonymous reviewer for prompting me both to think through these issues more carefully and to explicitly highlight this inconsistency.
Thanks to an anonymous reviewer for prompting me to think more critically about this.
They also do not offer any detailed positive examples of attributing sources of model success.
These two GCMs were configured in a total of five different ways (e.g., varying in terms of how snow and ice were represented, whether a deep ocean was used, and whether seasonal change was represented) to make five distinct projections.
These exploratory activities fall under what Wilson (2021) refers to as “Model dynamic exploration.”
The analysis in Cess et al. (1989) serves as a sort of midpoint between the uncoordinated model intercomparison and the coordinated ones. This intercomparison included some closely related models (i.e., from the same institutions) as well as more distinct models and analyses of the former were more fine-grained than those of the latter (e.g., see their discussion of GFDL I and II on their page 515). Moreover, many of the scientists involved helped develop the models being analyzed.
A list of publications from these diagnostic subprojects can be found here: https://pcmdi.llnl.gov/mips/amip/abstracts/abhme.html
Touzé-Peiffer et al. (2020) also give examples of successful model error diagnosis, saying “In fact, in the literature, we can find many studies investigating the link between the results of a model and its parameterizations (e.g., Hourdin et al., 2013; Notz et al., 2013).” They also mention “studies comparing radiation codes in different climate models, such as Oreopoulos et al. (2012) and Pincus et al. (2015), where the authors analyze not only the model results, but also the corresponding parameterizations and the assumptions they make” (9).
Recall: in AMIP, sea surface temperatures were prescribed. But these scientists still wanted to know what this heat transport would look like because future applications of these models would include coupling them to ocean models.
A "crucial test” would be superior, i.e., a test which distinguishes between the primary suspected error source in question and the other suspected error sources.
Thanks to Ben Kravitz for inspiring this suggestion.
Thanks to an anonymous reviewer for emphasizing this point.
A big challenge concerns resource availability. When presenting some of these ideas at [omitted for review], a climate modeler asked whether error diagnosis efforts should be focused on errors that have clear solutions vs. errors that are significant but difficult to understand or fix. Even if it is agreed that an error repertoire would be valuable, this doesn’t mean that the resources are available to construct or implement one.
Quotation marks pick out quotes from Goodwin (2015), pp. 342–343.
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This paper has benefited greatly from extensive discussions with (and feedback from) Lisa Lloyd, Dan Li, Phil Rasch, Evan Arnet, Ben Kravitz, Jutta Schickore, Ann Sophie Barwich, Scott Robeson, Monica Morrison, Matt Mayernik, Siyu Yao, Becca Jackson, and Stu Gluck.
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O’Loughlin, R. Diagnosing errors in climate model intercomparisons. Euro Jnl Phil Sci 13, 20 (2023). https://doi.org/10.1007/s13194-023-00522-z
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DOI: https://doi.org/10.1007/s13194-023-00522-z