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Glacial-interglacial changes in central tropical Pacific surface seawater property gradients

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  • Much uncertainty exists about the state of the oceanic and atmospheric circulation in the tropical Pacific over the last glacial cycle. Studies have been hampered by the fact that sediment cores suitable for study were concentrated in the western and eastern parts of the tropical Pacific, with little information from the central tropical Pacific. Here we present information from a suite of sediment cores collected from the Line Islands Ridge in the central tropical Pacific, which show sedimentation rates and stratigraphies suitable for paleoceanographic investigations. Based on the radiocarbon and oxygen isotope measurements on the planktonic foraminifera Globigerinoides ruber, we construct preliminary age models for selected cores and show that the gradient in the oxygen isotope ratio of G. ruber between the equator and 8°N is enhanced during glacial stages relative to interglacial stages. This stronger gradient could reflect enhanced equatorial cooling (perhaps reflecting a stronger Walker circulation) or an enhanced salinity gradient (perhaps reflecting increased rainfall in the central tropical Pacific).
  • This is the publisher’s final pdf. The article is copyrighted by American Geophysical Union and published by John Wiley & Sons Ltd. It can be found at: http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/%28ISSN%291944-9186/
  • Keywords: tropical Pacific, oxygen isotopes, foraminifera
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  • Lynch‐Stieglitz, J., Polissar, P. J., Jacobel, A. W., Hovan, S. A., Pockalny, R. A., Lyle, M., ... & Xie, R. C. (2015). Glacial‐interglacial changes in central tropical Pacific surface seawater property gradients. Paleoceanography, 30(5), 423-438. doi:10.1002/2014PA002746
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  • 30
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  • 5
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  • The oxygen isotope, radiocarbon, and multisensor track data presented in this paper is archived at the World Data Center for Paleoclimatology operated by the National Climatic Data Center of the National Oceanographic and Atmospheric Association (data set ID: noaa-ocean-1001374). The multibeam data are archived at the National Geophysical Data Center (NGDC ID: NEW1888, Cruise ID: MGL1208). This work was supported by National Science Foundation grants OCE-1159053 and OCE-1003374 (J.L.-S.), OCE-1158886 (P.J.P.), and OCE-1157486 (M.L.), OCE-1158994 (R.P.).
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