Late Miocene climate cooling and intensification of southeast Asian winter monsoon.

Holbourn, Ann E., Kuhnt, Wolfgang, Clemens, Steven C., Kochhann, Karlos G. D., Jöhnck, Janika, Lübbers, Julia and Andersen, Nils (2018) Late Miocene climate cooling and intensification of southeast Asian winter monsoon. Open Access Nature Communications, 9 (1). DOI 10.1038/s41467-018-03950-1.

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Abstract

The late Miocene offers the opportunity to assess the sensitivity of the Earth’s climate to orbital forcing and to changing boundary conditions, such as ice volume and greenhouse gas concentrations, on a warmer-than-modern Earth. Here we investigate the relationships between low- and high-latitude climate variability in an extended succession from the subtropical northwestern Pacific Ocean. Our high-resolution benthic isotope record in combination with paired mixed layer isotope and Mg/Ca-derived temperature data reveal that a long-term cooling trend was synchronous with intensification of the Asian winter monsoon and strengthening of the biological pump from ~7 Ma until ~5.5 Ma. The climate shift occurred at the end of a global δ13C decrease, suggesting that changes in the carbon cycle involving the terrestrial and deep ocean carbon reservoirs were instrumental in driving late Miocene climate cooling. The inception of cooler climate conditions culminated with ephemeral Northern Hemisphere glaciations between 6.0 and 5.5 Ma.

Document Type: Article
Keywords: Palaeoceanography, Palaeoclimate
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-018-03950-1
ISSN: 2041-1723
Projects: Future Ocean
Date Deposited: 09 May 2018 11:08
Last Modified: 27 Mar 2019 11:29
URI: http://oceanrep.geomar.de/id/eprint/42995

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