An inter-basin teleconnection from the North Atlantic to the subarctic North Pacific at multidecadal time scales
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Observational evidence suggests that the sub-arctic North Pacific (SANP; 45°–60° N, 155° E–165° W) sea surface temperature (SST) shows pronounced multidecadal variability, which cannot be explained by the Pacific Decadal Oscillation (PDO). Here, we find that the SANP SST multidecadal variability is closely linked to the remote Atlantic Multidecadal Oscillation (AMO), indicating a multidecadal inter-basin teleconnection. The teleconnection can be well reproduced in a set of Atlantic Pacemaker experiments. An atmospheric bridge mechanism for the teleconnection is proposed by analyzing both observations and simulation data. The AMO warm phase generates anomalous ascent and upper-level divergence over the North Atlantic. The upper-level outflows converge towards the subarctic North Pacific, leading to compensating subsidence along with anomalous high pressure there. The enhanced adiabatic descent causes anomalous warming and moistening of the lower troposphere above the SANP basin and increases the downwelling longwave radiation. The warming of the SANP SST is further induced and amplified due to water vapor-longwave radiation-SST positive feedback. The anomalous high also weakens the climatological cyclonic flow of Aleutian low and suppresses the turbulent heat release from ocean to atmosphere, contributing to the SANP SST warming. Our findings suggest that the AMO plays a crucial role in the subarctic North Pacific SST multidecadal variability.
KeywordsInter-basin teleconnection Atlantic Multidecadal Oscillation Sub-arctic North Pacific Multidecadal variability
The authors wish to thank the anonymous reviewers for their constructive comments that significantly improved the quality of this paper. This work was jointly supported by the National Natural Science Foundation of China (41775038, 41975082, and 41790474), the National Program on Global Change and Air–Sea Interaction (GASI‐IPOVAI‐03 and GASI‐IPOVAI‐06) and the National Key Research and Development Plan (2016YFA0601801). C.S. is supported by the State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences (Project LTO1801).
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