Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 50, Issue 18, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2023GL103672
Keywords
statistical emulator; machine learning; glacial isostatic adjustment; sea-level change
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Glacial isostatic adjustment (GIA) modeling is important for understanding past and future sea-level change. However, predictions are uncertain due to input ice history. This study developed a deep-learning-based emulator to reduce uncertainty and provided two applications for sea-level research.
Glacial isostatic adjustment (GIA) modeling is not only useful for understanding past relative sea-level change but also for projecting future sea-level change due to ongoing land deformation. However, GIA model predictions are subject to a range of uncertainties, most notably due to uncertainty in the input ice history. An effective way to reduce this uncertainty is to perform data-model comparisons over a large ensemble of possible ice histories, but this is often impossible due to computational limitations. Here we address this problem by building a deep-learning-based GIA emulator that can mimic the behavior of a physics-based GIA model while being computationally cheap to evaluate. Assuming a single 1-D Earth rheology, our emulator shows 0.54 m mean absolute error on 150 out-of-sample testing data with <0.5 s emulation time. Using this emulator, two illustrative applications related to the calculation of barystatic sea level are provided for use by the sea-level community.
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