Coexchangeable process modelling for uncertainty quantification in joint climate reconstruction
This is the final version. Available on open access from Taylor & Francis via the DOI in this record Any experiment with climate models relies on a potentially large set of spatiotemporal boundary conditions. These can represent both the initial state of the system and/or forcings driving the mo...
| Published in: | Journal of the American Statistical Association |
|---|---|
| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Taylor and Francis / American Statistical Association
2024
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10871/135279 https://doi.org/10.1080/01621459.2024.2325705 |
| Summary: | This is the final version. Available on open access from Taylor & Francis via the DOI in this record Any experiment with climate models relies on a potentially large set of spatiotemporal boundary conditions. These can represent both the initial state of the system and/or forcings driving the model output throughout the experiment. These boundary conditions are typically fixed using available reconstructions in climate modelling studies; however, in reality they are highly uncertain, that uncertainty is unquantified, and the e↵ect on the output of the experiment can be considerable. We develop efficient quantification of these uncertainties that combines relevant data from multiple models and observations. Starting from the coexchangeability model, we develop a coexchangeable process model to capture multiple correlated spatiotemporal fields of variables. We demonstrate that further exchangeability judgements over the parameters within this representation lead to a Bayes linear analogy of a hierarchical model. We use the framework to provide a joint reconstruction of sea-surface temperature and sea-ice concentration boundary conditions at the last glacial maximum (23–19 kya) and use it to force an ensemble of ice-sheet simulations using the FAMOUS-Ice coupled atmosphere and ice-sheet model. We demonstrate that existing boundary conditions typically used in these experiments are implausible given our uncertainties and demonstrate the impact of using more plausible boundary conditions on ice-sheet simulation. UK Research and Innovation |
|---|