Title:
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El Niño-Southern Oscillation-like variability during glacial terminations and interlatitudinal teleconnections
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Author:
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Pena González, Leopoldo David; Cacho Lascorz, Isabel; Ferretti, P.; Hall, M.A.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Canvis climàtics -Paleoceanografia -Corrents marins -Corrent del Niño -Interacció oceà-atmosfera -Climatic changes -Paleoceanography -Ocean currents -El Niño Current -Ocean-atmosphere interaction |
Rights:
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(c) American Geophysical Union, 2008
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Document type:
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Article Article - Published version |
Published by:
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American Geophysical Union
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