Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated?

Shackleton, S., Bereiter, B., Baggenstos, Daniel, Bauska, Thomas, Brook, Edward J., Marcott, Shaun A. and Severinghaus, Jeffrey P. (2019) Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? Geophysical Research Letters, 46 (11). pp. 5928-5936. ISSN 0094-8276

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Official URL: https://doi.org/10.1029/2019GL082971

Abstract

Noble gases in ice cores enable reconstructions of past mean ocean temperature. A recent result from the clathrate‐containing WAIS Divide Ice Core showed tight covariation between ocean and Antarctic temperatures throughout the last deglaciation, except for the Younger Dryas interval. In the beginning of this interval oceans warmed at 2.5°C/kyr ‐ three times greater than estimates of modern warming. If valid, this challenges our understanding of the mechanisms controlling ocean heat uptake. Here we reconstruct mean ocean temperature with clathrate‐free ice samples from Taylor Glacier to test these findings. The two records agree in net temperature change over the Younger Dryas, but the Taylor Glacier record suggests sustained warming at the more modest rate of 1.1±0.2°C/kyr. We explore mechanisms to explain differences between records and suggest that the noble gas content for the Younger Dryas interval of WAIS Divide may have been altered by a decimeter‐scale fractionation during bubble‐clathrate transformation.

Item Type: Article
Uncontrolled Keywords: ice cores, ocean heat uptake, Younger Dryas, bubble-to-clathrate formation, paleoclimate
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Related URLs:
Depositing User: Paul Burns
Date Deposited: 17 May 2019 11:39
Last Modified: 11 Oct 2019 09:46
URI: http://nrl.northumbria.ac.uk/id/eprint/39343

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