SST-driven variability of the East Asian summer jet on a decadal time-scale in CMIP6 models

Patterson, M., O'Reilly, C. ORCID: https://orcid.org/0000-0002-8630-1650, Woollings, T., Weisheimer, A. and Wu, B. (2022) SST-driven variability of the East Asian summer jet on a decadal time-scale in CMIP6 models. Quarterly Journal of the Royal Meteorological Society, 148 (743). pp. 581-598. ISSN 1477-870X doi: 10.1002/qj.4219

Abstract/Summary

The East Asian summer jet (EASJ) is an important component of the East Asian summer monsoon system and its variability is correlated with precipitation and surface temperature variations over this region. Whilst many studies have considered the interannual variability of the EASJ, less is known about variations on a decadal time-scale. This study investigates the relationship between decadal EASJ variability and sea surface temperatures (SSTs) and thus the potential predictability that SSTs may provide. Given the relatively short observational record, we make use of the long pre-industrial control simulations in the Coupled Model Intercomparison Project phase 6 (CMIP6) in addition to a large ensemble of atmosphere-only experiments, forced with random SST patterns. We then create an SST-based reconstruction of the dominant modes of EASJ variability in the CMIP6 models, finding a median EASJ–reconstruction correlation for the dominant mode of 0.43. Much of the skill in the reconstruction arises from variations in Pacific SSTs, however the tropical Atlantic also makes a significant contribution. These findings suggest the potential for multi-year predictions of the EASJ, provided that skilful SST forecasts are available.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/106815
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	Royal Meteorological Society
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