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El Niño and Southern Oscillation (ENSO): A Review

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Coral Reefs of the Eastern Tropical Pacific

Part of the book series: Coral Reefs of the World ((CORW,volume 8))

Abstract

The ENSO observing system in the tropical Pacific plays an important role in monitoring ENSO and helping improve the understanding and prediction of ENSO. Occurrence of ENSO has been explained as either a self-sustained and naturally oscillatory mode of the coupled ocean-atmosphere system or a stable mode triggered by stochastic forcing. In either case, ENSO involves the positive ocean-atmosphere feedback hypothesized by Bjerknes. After an El Niño reaches its mature phase, negative feedbacks are required to terminate growth of the mature El Niño anomalies in the central and eastern Pacific. Four negative feedbacks have been proposed: reflected Kelvin waves at the ocean western boundary, a discharge process due to Sverdrup transport, western Pacific wind-forced Kelvin waves, and anomalous zonal advections. These negative feedbacks may work together for terminating El Niño, with their relative importance varying with time. Because of different locations of maximum SST anomalies and associated atmospheric heating, El Niño events are classified as eastern and central Pacific warming events. The identification of two distinct types of El Niño offers a new way to examine global impacts of El Niño and to consider how El Niño may respond and feedback to a changing climate. In addition to interannual variations associated with ENSO, the tropical Pacific SSTs also fluctuate on longer timescales. The patterns of Pacific Decadal Variability (PDV) are very similar to those of ENSO. When SST anomalies are positive in the tropical eastern Pacific, they are negative to the west and over the central North and South Pacific, and positive over the tropical Indian Ocean and northeastern portions of the high-latitude Pacific Ocean. Many mechanisms have been proposed for explaining PDV. Changes in ENSO under global warming are uncertain. Increasing greenhouse gases change the mean states in the tropical Pacific, which in turn induce ENSO changes. Due to the fact that the change in mean tropical condition under global warming is quite uncertain, even during the past few decades, it is difficult to say whether ENSO will intensify or weaken, but it is very likely that ENSO will not disappear in the future.

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Acknowledgments

CW thanks Ms. L. Zhang for plotting Fig. 4.1 and helping modify Fig. 4.2 provided by Dr. M. McPhaden. CD would like to thank Dr. Toby Ault for useful discussions and Mr. Adam Phillips for technical assistance with the figures. We thank Dr. Paul Fiedler and an anonymous reviewer for their comments and suggestions. CW is supported by grants from NOAA’s Climate Program Office, and the base funding of NOAA AOML. NCAR is sponsored by the National Science Foundation (NSF). JYY acknowledges the support from NSF Grant ATM-0925396 and NOAA-MAPP Grant NA11OAR4310102. The findings and conclusions in this report are those of the author(s) and do not necessarily represent the views of the funding agencies.

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Authors and Affiliations

  1. NOAA/Atlantic Oceanographic and Meteorological Laboratory, 4301 Rickenbacker Causeway, 33149, Miami, FL, USA

    Chunzai Wang

  2. National Center for Atmospheric Research, Boulder, CO, USA

    Clara Deser

  3. University of California at Irvine, Irvine, CA, USA

    Jin-Yi Yu

  4. International Pacific Research Center, University of Hawaii, Honolulu, HI, USA

    Pedro DiNezio

  5. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA

    Amy Clement

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  1. Chunzai Wang
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  2. Clara Deser
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  3. Jin-Yi Yu
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  4. Pedro DiNezio
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  5. Amy Clement
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Correspondence to Chunzai Wang .

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Editors and Affiliations

  1. RSMAS MBE, University of Miami, Miami, Florida, USA

    Peter W. Glynn

  2. NOAA/AOML, Miami, Florida, USA

    Derek P. Manzello

  3. RSMAS CIMAS - NOAA/AOML, University of Miami, Miami, Florida, USA

    Ian C. Enochs

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Wang, C., Deser, C., Yu, JY., DiNezio, P., Clement, A. (2017). El Niño and Southern Oscillation (ENSO): A Review. In: Glynn, P., Manzello, D., Enochs, I. (eds) Coral Reefs of the Eastern Tropical Pacific. Coral Reefs of the World, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7499-4_4

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