Global ocean heat content in the Last Interglacial

Shackleton, S.; Baggenstos, D.; Menking, J.A.; Dyonisius, M.N.; Bereiter, B.; Bauska, T.K. ORCID: https://orcid.org/0000-0003-1901-0367; Rhodes, R.H.; Brook, E.J.; Petrenko, V.V.; McConnell, J.R.; Kellerhals, T.; Häberli, M.; Schmitt, J.; Fischer, H.; Severinghaus, J.P.. 2020 Global ocean heat content in the Last Interglacial. Nature Geoscience, 13 (1). 77-81. https://doi.org/10.1038/s41561-019-0498-0

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Abstract/Summary

The Last Interglacial (129–116 thousand years ago (ka)) represents one of the warmest climate intervals of the past 800,000 years and the most recent time when sea level was metres higher than today. However, the timing and magnitude of the peak warmth varies between reconstructions, and the relative importance of individual sources that contribute to the elevated sea level (mass gain versus seawater expansion) during the Last Interglacial remains uncertain. Here we present the first mean ocean temperature record for this interval from noble gas measurements in ice cores and constrain the thermal expansion contribution to sea level. Mean ocean temperature reached its maximum value of 1.1 ± 0.3 °C warmer-than-modern values at the end of the penultimate deglaciation at 129 ka, which resulted in 0.7 ± 0.3 m of thermosteric sea-level rise relative to present level. However, this maximum in ocean heat content was a transient feature; mean ocean temperature decreased in the first several thousand years of the interglacial and achieved a stable, comparable-to-modern value by ~127 ka. The synchroneity of the peak in mean ocean temperature with proxy records of abrupt transitions in the oceanic and atmospheric circulation suggests that the mean ocean temperature maximum is related to the accumulation of heat in the ocean interior during the preceding period of reduced overturning circulation.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1038/s41561-019-0498-0
ISSN:	17520894
NORA Subject Terms:	Marine Sciences
Date made live:	13 Jan 2020 15:36 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/526416

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1038/s41561-019-0498-0

ISSN:

17520894

NORA Subject Terms:

Marine Sciences

Date made live:

13 Jan 2020 15:36 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/526416