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Orbital modulation of ENSO seasonal phase locking

  • Zhengyao Lu
  • Zhengyu Liu
Article

Abstract

Modern El Niño-Southern Oscillation (ENSO) events are characterized by their phase locking of variability to the seasonal cycle and tend to peak at the end of calendar year. Here, we show that in an idealized NCAR-CCSM3 simulation of the climate of the last 300,000 years, ENSO seasonal phase locking is shifted periodically following the precessional forcing: ENSO tends to peak in boreal winter when perihelion is near vernal equinox, but to peak in boreal summer when perihelion lies in between autumnal equinox and winter solstice. The mechanism for the change of ENSO’s phase locking is proposed to be caused by the change of seasonality of the growth rate, or the intensity of ocean–atmosphere feedbacks, of ENSO. It is found that the December peak of ‘winter ENSO’ is caused by the continuous growth of ENSO anomaly from June to November, while the May–June peak of ‘summer ENSO’ appears to be caused jointly by the seasonal shift of higher growth rate into spring and stronger stochastic noise towards the first half of the year. Furthermore, the change of the seasonal cycle of feedbacks is contributed predominantly by that of the thermodynamic damping. The summer peak of ENSO is proposed to be caused by the following mechanism. A perihelion in the late fall to early winter leads to a cooling of the surface eastern equatorial Pacific (EEP) due to reduced insolation in spring. This cooling, reinforced by an oceanic process, reduces the latent heat flux damping in spring, and therefore favors the growth of the eastern Pacific-like ENSO (as opposed to the central Pacific-like ENSO). This EEP cooling is also likely to generate more effective short wave-cloud-SST feedback and, in turn, increased instability. Ultimately, the weakened thermodynamic damping in spring, combined with relatively intensive stochastic forcing, benefits the subsequent summer peak of ENSO.

Keywords

ENSO Orbital forcing Ocean–atmosphere feedbacks Phase locking 

Notes

Acknowledgements

This work is supported by Chinese NSFC41630527 and MOST2017YFA0603801, and US NSF AGS-1656907. We thank Dr. Guangshan Chen for performing the 300 ka accelerated simulations. We also thank two anonymous reviewers for their thoughtful and constructive comments that have helped to greatly improve the quality of the manuscript.

Supplementary material

382_2018_4382_MOESM1_ESM.docx (2.1 mb)
Supplementary material 1 (DOCX 2152 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Lab. Climate, Ocean and Atmosphere Studies, School of PhysicsPeking UniversityBeijingPeople’s Republic of China
  2. 2.Department of GeographyOhio State UniversityColumbusUSA
  3. 3.Department of Physical Geography and Ecosystem ScienceLund UniversityLundSweden

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