Impact of a permanent El Niñ (El Padre) and Indian Ocean Dipole in warm Pliocene climates

Sonali P. Shukla, Mark A. Chandler, Jeff Jonas, Linda E. Sohl, Ken Mankoff, Harry Dowsett

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    Abstract

    Pliocene sea surface temperature data, as well as terrestrial precipitation and temperature proxies, indicate warmer than modern conditions in the eastern equatorial Pacific and imply permanent El Niño-like conditions with impacts similar to those of the 1997/1998 El Niño event. Here we use a general circulation model to examine the global-scale effects that result from imposing warm tropical sea surface temperature (SST) anomalies in both modern and Pliocene simulations. Observed SSTs from the 1997/1998 El Niño event were used for the ,anomalies and incorporate Pacific wanning as well as a prominent Indian Ocean Dipole event. Both the permanent El Niño (also called El Padre) and Indian Ocean Dipole (IOD) conditions are necessary to reproduce temperature and precipitation patterns consistent with the global distribution of Pliocene proxy data. These patterns may result from the poleward propagation of planetary waves from the strong convection centers associated with the El Niño and IOD.

    Original languageEnglish (US)
    Article numberPA2221
    JournalPaleoceanography
    Volume24
    Issue number2
    DOIs
    StatePublished - Jun 1 2009

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    ASJC Scopus subject areas

    • Oceanography
    • Palaeontology

    Cite this

    Shukla, S. P., Chandler, M. A., Jonas, J., Sohl, L. E., Mankoff, K., & Dowsett, H. (2009). Impact of a permanent El Niñ (El Padre) and Indian Ocean Dipole in warm Pliocene climates. Paleoceanography, 24(2), [PA2221]. https://doi.org/10.1029/2008PA001682