Abstract
The extent to which decadal-to-multidecadal climate trends forced by carbon dioxide (\(\text{CO}_2\)) and anthropogenic aerosol (AER) emissions depend on the phase and amplitude of internal modes of climate variability, such as Atlantic Multidecadal Variability (AMV), is an open question. This study uses a fully coupled CMIP5-era general circulation model (GCM) to investigate climate trends forced by increasing \(\text{CO}_2\) and AER in the presence of opposite decaying phases of the AMV. Ensembles of simulations are initialized from extreme warm (\(\text{AMV}_{(+)}\)) and cold (\(\text{AMV}_{(-)}\)) phases of AMV and, while the global mean temperature trends are similar, significant regional differences are found over the Arctic and northern extratropics. Specifically, the response to \(\text{CO}_2\) forcing is hemispherically asymmetric, with western Eurasia warming 20–30% more, and North America and the extratropical North Pacific warming 20–30% less, in \(\text{AMV}_{(+)}\) than in \(\text{AMV}_{(-)}\). This asymmetry is explained by the atmospheric response to differences in the initial concentration of sea ice in the Atlantic Arctic sector, and by a large-scale atmospheric teleconnection pattern originating in the tropical Indo-Pacific. A decomposition of the temperature trends reveals that the AMV influence occurs mostly through atmospheric dynamics; however, thermodynamic processes are important in regions of sea ice change, western Eurasia, and eastern North America. The difference in the responses to \(\text{CO}_2\) and AER forcing between AMV phases reveals that some aspects of the AMV modulation of the response, such as a more positive (negative) temperature trend in \(\text{AMV}_{(+)}\) than in \(\text{AMV}_{(-)}\) in western Eurasia (the extratropical North Pacific), are largely independent of the sign, magnitude and spatial pattern of external forcing.
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Acknowledgements
SRH acknowledges support from a Canada Graduate Scholarship from the Natural Science and Engineering Research Council, and CGF acknowledges support from an NSERC Discovery Grant (402661). The simulations used in this research were carried out under the project MORDICUS, funded by the French Agence Nationale de la Recherche (ANR-13-SENV-0002-02).
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Hyatt, S.R., Fletcher, C.G., Cassou, C. et al. The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability. Clim Dyn 55, 487–502 (2020). https://doi.org/10.1007/s00382-020-05278-3
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DOI: https://doi.org/10.1007/s00382-020-05278-3