Affiliation:
1. Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, CA 93106–9630, USA
Abstract
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (∼55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by ∼60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO
2
(
p
CO
2
). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic
p
CO
2
drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling.
Publisher
American Association for the Advancement of Science (AAAS)
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