El Niño–Southern Oscillation–like variability during glacial terminations and interlatitudinal teleconnections

Pena, L. D. and Cacho, I. and Ferretti, P. and Hall, M. A. (2008) El Niño–Southern Oscillation–like variability during glacial terminations and interlatitudinal teleconnections. Paleoceanography, 23. PA3101. DOI 10.1029/2008PA001620.

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Abstract

Interannual-decadal variability in the equatorial Pacific El Niño–Southern Oscillation (ENSO) induces climate changes at global scale, but its potential influence during past global climate change is not yet well constrained. New high-resolution eastern equatorial Pacific proxy records of thermocline conditions present new evidence of strong orbital control in ENSO-like variability over the last 275,000 years. Recurrent intervals of saltier thermocline waters are associated with the dominance of La Niña–like conditions during glacial terminations, coinciding with periods of low precession and high obliquity. The parallel dominance of δ 13C-depleted waters supports the advection of Antarctic origin waters toward the tropical thermocline. This “oceanic tunneling” is proposed to have reinforced orbitally induced changes in ENSO-like variability, composing a complex high- and low-latitude feedback during glacial terminations.

Item Type: Article
Uncontrolled Keywords: 08AREP IA57 2008 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Paleoceanography
Volume: 23
Page Range: PA3101
Identification Number: 10.1029/2008PA001620.
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/585

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