Abstract
This study investigates the multidecadal variations of the interannual relationship between the East Asian summer monsoon (EASM) and El Niño-Southern Oscillation (ENSO) in 1000-year simulation of a coupled climate model. The interannual relationship between ENSO and EASM has experienced pronounced changes throughout the 1000-year simulation. During the periods with significant ENSO-EASM relationship, the ENSO-related circulation anomalies show a Pacific-Japan (PJ)-like pattern with significant wave-activity flux propagating from the tropics to the north in lower troposphere and from the mid-latitudes to the south in upper troposphere. The resultant ENSO-related precipitation anomalies are more (less) than normal over the East Asia (western North Pacific) in the decaying summers of El Niño events. In contrast, the circulation and precipitation anomalies are weak over East Asia-western North Pacific during the periods with weak ENSO-EASM relationship. Based on the energy conversion analysis, the related anomalies achieve barotropic and baroclinic energy from the mean flow during the periods with strong ENSO-EASM relationship. On the contrary, during the low-correlation periods, the energy conversion is too weak to form the link between the tropics and mid-latitudes. The main reason for the multidecadal variations of ENSO-EASM relationship is the amplitude discrepancy of SST anomalies over the Indo-western Pacific Ocean which, in turn, leads to the intensity difference of the western North Pacific anomalous anticyclone (WPAC) and related climate anomalies.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (41425019, 41721004, 41661144016 and 41376112) and the Public Science and Technology Research Funds Projects of Ocean (201505013) and the CAS Key Technology Talent Program.
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Liu, B., Huang, G., Hu, K. et al. The multidecadal variations of the interannual relationship between the East Asian summer monsoon and ENSO in a coupled model. Clim Dyn 51, 1671–1686 (2018). https://doi.org/10.1007/s00382-017-3976-3
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DOI: https://doi.org/10.1007/s00382-017-3976-3