Southern Ocean convection amplified past Antarctic warming and atmospheric CO2 rise during Heinrich Stadial 4

Skinner, Luke and Menviel, Laurie and Broadfield, Lauren and Gottschalk, Julia and Greaves, Mervyn (2020) Southern Ocean convection amplified past Antarctic warming and atmospheric CO2 rise during Heinrich Stadial 4. Communications Earth & Environment, 1 (1). ISSN 2662-4435 DOI https://doi.org/10.1038/s43247-020-00024-3

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Official URL: https://doi.org/10.1038/s43247-020-00024-3

Abstract

The record of past climate highlights recurrent and intense millennial anomalies, characterised by a distinct pattern of inter-polar temperature change, termed the ‘thermal bipolar seesaw’, which is widely believed to arise from rapid changes in the Atlantic overturning circulation. By forcing a suppression of North Atlantic convection, models have been able to reproduce many of the general features of the thermal bipolar seesaw; however, they typically fail to capture the full magnitude of temperature change reconstructed using polar ice cores from both hemispheres. Here we use deep-water temperature reconstructions, combined with parallel oxygenation and radiocarbon ventilation records, to demonstrate the occurrence of enhanced deep convection in the Southern Ocean across the particularly intense millennial climate anomaly, Heinrich Stadial 4. Our results underline the important role of Southern Ocean convection as a potential amplifier of Antarctic warming, and atmospheric CO2 rise, that is responsive to triggers originating in the North Atlantic.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
06 - Part-III Projects
07 - Gold Open Access
Journal or Publication Title: Communications Earth & Environment
Volume: 1
Identification Number: https://doi.org/10.1038/s43247-020-00024-3
Depositing User: Sarah Humbert
Date Deposited: 03 Dec 2020 19:55
Last Modified: 03 Dec 2020 19:55
URI: http://eprints.esc.cam.ac.uk/id/eprint/4940

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