The southern amplifier
Abstract
Earth's natural climate variability of the past ∼2.6 million years has been dominated by glacial-interglacial cycles. These cycles are paced by variations in incoming solar radiation due to changes in Earth's orbit around the Sun. Feedbacks in the Earth system, including variations in greenhouse gas concentrations and the growth and retreat of Northern Hemispheric ice sheets, amplify the effects of the insolation changes. The characteristics and amplitude of the cycles changed fundamentally at the mid-Pleistocene transition, between 1.25 million and 700,000 years ago. On page 1080 of this issue, Hasenfratz et al. (1) report that this transition was associated with increased Southern Ocean stratification and reduced upwelling during glacial times.
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References and Notes
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Information & Authors
Information
Published In
Science
Volume 363 | Issue 6431
8 March 2019
8 March 2019
Copyright
Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
This is an article distributed under the terms of the Science Journals Default License.
Submission history
Published in print: 8 March 2019
Acknowledgments
L.M. acknowledges support from the Australian Research Council grants FT180100606 and DP180100048.
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- On the Cause of the Mid‐Pleistocene Transition, Reviews of Geophysics, 59, 2, (2021).https://doi.org/10.1029/2020RG000727
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