TY - JOUR
T1 - Latest Pliocene Northern Hemisphere glaciation amplified by intensified Atlantic meridional overturning circulation
AU - Hayashi, Tatsuya
AU - Yamanaka, Toshiro
AU - Hikasa, Yuki
AU - Sato, Masahiko
AU - Kuwahara, Yoshihiro
AU - Ohno, Masao
N1 - Funding Information:
The samples used in this study were provided by the Integrated Ocean Drilling Program (IODP). We are indebted to staff of the R/V JOIDES Resolution and the IODP Bremen Core Repository. This study was performed under the cooperative research program of Center for Advanced Marine Core Research, Kochi University No.15A013. This work was supported by JSPS KAKENHI Grant Number JP18H03358. We thank S. J. Mason, MSc, from Edanz Group ( https://en-author-services.edanzgroup.com/ ) for editing a draft of this manuscript.
Funding Information:
The samples used in this study were provided by the Integrated Ocean Drilling Program (IODP). We are indebted to staff of the R/V JOIDES Resolution and the IODP Bremen Core Repository. This study was performed under the cooperative research program of Center for Advanced Marine Core Research, Kochi University No.15A013. This work was supported by JSPS KAKENHI Grant Number JP18H03358. We thank S. J. Mason, MSc, from Edanz Group (https://en-author-services.edanzgroup.com/) for editing a draft of this manuscript.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12
Y1 - 2020/12
N2 - The global climate has been dominated by glacial–interglacial variations since the intensification of Northern Hemisphere glaciation 2.7 million years ago. Although the Atlantic meridional overturning circulation has exerted strong influence on recent climatic changes, there is controversy over its influence on Northern Hemisphere glaciation because its deep limb, North Atlantic Deep Water, was thought to have weakened. Here we show that Northern Hemisphere glaciation was amplified by the intensified Atlantic meridional overturning circulation, based on multi-proxy records from the subpolar North Atlantic. We found that the Iceland–Scotland Overflow Water, contributing North Atlantic Deep Water, significantly increased after 2.7 million years ago and was actively maintained even in early stages of individual glacials, in contrast with late stages when it drastically decreased because of iceberg melting. Probably, the active Nordic Seas overturning during the early stages of glacials facilitated the efficient growth of ice sheets and amplified glacial oscillations.
AB - The global climate has been dominated by glacial–interglacial variations since the intensification of Northern Hemisphere glaciation 2.7 million years ago. Although the Atlantic meridional overturning circulation has exerted strong influence on recent climatic changes, there is controversy over its influence on Northern Hemisphere glaciation because its deep limb, North Atlantic Deep Water, was thought to have weakened. Here we show that Northern Hemisphere glaciation was amplified by the intensified Atlantic meridional overturning circulation, based on multi-proxy records from the subpolar North Atlantic. We found that the Iceland–Scotland Overflow Water, contributing North Atlantic Deep Water, significantly increased after 2.7 million years ago and was actively maintained even in early stages of individual glacials, in contrast with late stages when it drastically decreased because of iceberg melting. Probably, the active Nordic Seas overturning during the early stages of glacials facilitated the efficient growth of ice sheets and amplified glacial oscillations.
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U2 - 10.1038/s43247-020-00023-4
DO - 10.1038/s43247-020-00023-4
M3 - Article
AN - SCOPUS:85132153881
SN - 2662-4435
VL - 1
JO - Communications Earth and Environment
JF - Communications Earth and Environment
IS - 1
M1 - 25
ER -