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Revisiting MJO, Kelvin waves, and El Niño relationships using a simple ocean model

  • Nicholas D. LybargerEmail author
  • Cristiana Stan
Article

Abstract

Mechanisms governing interactions between the Madden–Julian Oscillation (MJO), Kelvin wave activity, and El Niño development are reexamined using the oceanic component of the Zebiak–Cane (ZCocn) model of the Pacific basin. Prescribed wind stress from a free run of the super-parameterized Community Climate System Model version 4 (SP-CCSM4) is used to force ZCocn and the simulated El Niño events are analyzed with respect to their relationship with the MJO wind forcing. Composites of El Niño events strongly influenced by the MJO show the earlier onset of a flattened, El Niño-like state of the thermocline. In contrast, the composites of El Niño events not influenced by the MJO winds show a later onset, and are dominated by a transient-like thermocline along with periods of upwelling Kelvin wave activity. Sensitivity experiments performed to identify whether modifying MJO wind stress and oceanic Kelvin wave activity influences these features show that although MJO contributes to the development of these features, it is not necessarily the primary driver. The relative phasing between MJO and oceanic Kelvin wave activity seems to be the most important factor governing the influence of MJO on El Niño. When in phase and collocated with Kelvin wave activity, MJO westerly wind stress contributes to the amplification of preexisting downwelling Kelvin waves, leading to earlier onset and greater strength of the resulting El Niño events. The out-of-phase interactions between MJO and oceanic Kelvin waves explain the observed lack of influence of MJO onto some El Niño events.

Notes

Acknowledgements

This work was supported by US NSF Grants AGS-1338427 and AGS-1211848, US NOAA Grants NA14OAR4310160, NA12NWS4680022, and US NASA Grant NNX14AM19G. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant number OCI-1053575. We would like to thank Dr. Jieshun Zhu of ESSIC and three anonymous reviewers for helping us improve our manuscript significantly.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Atmospheric, Oceanic, and Earth ScienceGeorge Mason UniversityFairfaxUSA
  2. 2.Center for Ocean-Land-Atmosphere StudiesFairfaxUSA

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