Suppression of El Niño during the mid-Holocene by changes in the Earth's orbit

Amy C Clement, R. Seager, M. A. Cane

Research output: Contribution to journalArticle

305 Citations (Scopus)

Abstract

A number of recent reports have interpreted paleoproxy data to describe the state of the tropical Pacific, especially changes in the behavior of the El Niño-Southern Oscillation (ENSO), over the Holocene. These interpretations are often contradictory, especially for the eastern tropical Pacific and adjacent areas of South America. Here we suggest a picture of the mid-Holocene tropical Pacific region which reconciles the data. ENSO variability was present throughout the Holocene but underwent a steady increase from the mid-Holocene to the present. In the mid-Holocene, extreme warm El Niño events were smaller in amplitude and occurred less frequently about a mean climate state with a cold eastern equatorial Pacific and largely arid coastal regions as in the present climate. This picture emerges from an experiment in which a simple numerical model of the coupled ocean-atmosphere system in the tropical Pacific was driven by orbital forcing. We suggest that the observed behavior of the tropical Pacific climate over the mid- to late Holocene is largely the response to orbitally driven changes in the seasonal cycle of solar radiation in the tropics, which dominates extratropical influences.

Original languageEnglish (US)
Pages (from-to)731-737
Number of pages7
JournalPaleoceanography
Volume15
Issue number6
DOIs
StatePublished - 2000
Externally publishedYes

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Holocene
Southern Oscillation
climate
orbital forcing
atmosphere-ocean system
solar radiation
experiment

ASJC Scopus subject areas

  • Oceanography
  • Palaeontology

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Suppression of El Niño during the mid-Holocene by changes in the Earth's orbit. / Clement, Amy C; Seager, R.; Cane, M. A.

In: Paleoceanography, Vol. 15, No. 6, 2000, p. 731-737.

Research output: Contribution to journalArticle

Clement, Amy C ; Seager, R. ; Cane, M. A. / Suppression of El Niño during the mid-Holocene by changes in the Earth's orbit. In: Paleoceanography. 2000 ; Vol. 15, No. 6. pp. 731-737.
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