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Holocene hydroclimatic variability in the tropical Pacific explained by changing ENSO diversity

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  • Christina Karamperidou

    (University of Hawaii at Manoa)

  • Pedro N. DiNezio

    (University of Colorado Boulder, 311 UCB)

Abstract

Understanding El Niño-Southern Oscillation (ENSO) response to past climate forcings is hindered by conflicting paleoclimate evidence. Records from the eastern Pacific show an intensification of ENSO variability from early to late Holocene, while records from the central Pacific show highly variable ENSO throughout the Holocene without an obvious relation to insolation forcing, which is the main climate driver during this interval. Here, we show via climate model simulations that conflicting Holocene records can be reconciled by considering changes in the relative frequency of the three preferred spatial patterns in which El Niño events occur (Eastern Pacific, Central Pacific, and Coastal) and in the strength of their hydroclimatic impacts. The relationship between ENSO diversity and variance is not only crucial for interpreting paleo-ENSO records and understanding ENSO response to external forcings but can also be used across climate model simulations to help evaluate the realism of ENSO projections in a changing climate.

Suggested Citation

  • Christina Karamperidou & Pedro N. DiNezio, 2022. "Holocene hydroclimatic variability in the tropical Pacific explained by changing ENSO diversity," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34880-8
    DOI: 10.1038/s41467-022-34880-8
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    References listed on IDEAS

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    1. Christopher M. Moy & Geoffrey O. Seltzer & Donald T. Rodbell & David M. Anderson, 2002. "Variability of El Niño/Southern Oscillation activity at millennial timescales during the Holocene epoch," Nature, Nature, vol. 420(6912), pages 162-165, November.
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