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Interdecadal variability of the mega-ENSO–NAO synchronization in winter

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Abstract

Mega-El Niño-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO), as two principal components of the global air-sea coupling system, may have synchronous or out-synchronous fluctuations during different epochs. Understanding such connection change is instrumental for climate prediction, particularly the decadal prediction. Results in this study show that mega-ENSO has experienced a notable inter-decadal change in its linkage with the winter NAO during the past 56 years: mega-ENSO was significantly correlated with the NAO during 1957–1981 (or synchronous epoch), while such correlation has broken down since 1982 (or out-synchronous epoch). This marked change might be attributed to a sea surface temperature (SST) forcing change in the North Atlantic, based on the observational and numerical evidences in this study. The synchronous epoch is concurrent with the anomalous tropical North Atlantic (TNA) SST forcing, whereas the out-synchronous epoch is associated with the anomalous extra-tropical North Atlantic (XNA) SST forcing. Two possible reasons may explain how the synchronous behaviors between mega-ENSO and the NAO were tied to the TNA SST anomaly (SSTA). There is a positive feedback between the TNA SSTA and the NAO-like atmosphere anomalies, which helps to “prolong” the NAO impacts from the developing phase through mature phase of mega-ENSO. Additionally, the TNA SSTA itself may induce a NAO-like atmosphere anomaly. Since 1982, the TNA SSTA has been replaced by the XNA SSTA and the latter primarily favors a NAO-neutral state in the atmosphere, which ends the synchronous epoch.

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Acknowledgments

We appreciate the ECMWF for providing the ERA-40 and ERA-interim re-analysis data. Zhiwei Wu is jointly supported by the Ministry of Science and Technology of China (Grant Nos. 2015CB453201, 2015CB953904) and the National Natural Science Foundation of China (Grant No. 91437216 and 41205066). This is ESMC publication No. 0014.

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  1. Earth System Modeling Center (ESMC) and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, 219 Ningliu RD, Nanjing, 210044, Jiangsu, China

    Zhiwei Wu & Peng Zhang

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  1. Zhiwei Wu
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  2. Peng Zhang
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Correspondence to Zhiwei Wu.

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Wu, Z., Zhang, P. Interdecadal variability of the mega-ENSO–NAO synchronization in winter. Clim Dyn 45, 1117–1128 (2015). https://doi.org/10.1007/s00382-014-2361-8

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  • DOI: https://doi.org/10.1007/s00382-014-2361-8

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