Abstract
In this study, the potential predictability of the Northern America (NA) surface air temperature (SAT) was explored using an information-based predictability framework and two multiple model ensemble products: a one-tier prediction by coupled models (T1), and a two-tier prediction by atmospheric models only (T2). Furthermore, the potential predictability was optimally decomposed into different modes for both T1 and T2, by extracting the most predictable structures. Emphasis was placed on the comparison of the predictability between T1 and T2. It was found that the potential predictability of the NA SAT is seasonal and spatially dependent in both T1 and T2. Higher predictability occurs in spring and winter and over the southeastern US and northwestern Canada. There is no significant difference of potential predictability between T1 and T2 for most areas of NA, although T1 has higher potential predictability than T2 in the southeastern US. Both T1 and T2 display similar most predictable components (PrCs) for the NA SAT, characterized by the inter-annual variability mode and the long-term trend mode. The first one is inherent to the tropical Pacific sea surface temperature forcing, such as the El Nino-Southern Oscillation, whereas the second one is closely associated with global warming. In general, the PrC modes can better characterize the predictability in T1 than in T2, in particular for the inter-annual variability mode in the fall. The prediction skill against observations is better measured by the PrC analysis than by principal component analysis for all seasons, indicating the stronger capability of PrCA in extracting prediction targets.
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Notes
The SST prediction is made using either a persistent model or another forecast model (e.g., a statistical model).
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Acknowledgments
This work was supported by the Canada NSERC Discovery Grant, NSF of China (41276029), and the National Key Basic Research Program of China (Grant No. 2013CB430302).
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Tang, Y., Chen, D. & Yan, X. Potential predictability of Northern America surface temperature in AGCMs and CGCMs. Clim Dyn 45, 353–374 (2015). https://doi.org/10.1007/s00382-014-2335-x
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DOI: https://doi.org/10.1007/s00382-014-2335-x