Impact of meltwater on high-latitude early Last Interglacial climate

Stone, Emma J. and Capron, Emilie and Lunt, Daniel J. and Payne, Antony J. and Singarayer, Joy S. and Valdes, Paul J. and Wolff, Eric W. (2016) Impact of meltwater on high-latitude early Last Interglacial climate. Climate of the past, 12 (9). pp. 1919-1932. ISSN 1814-9340 DOI 10.5194/cp-12-1919-2016

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Official URL: http://doi.org/10.5194/cp-12-1919-2016

Abstract

Recent data compilations of the early Last Interglacial period have indicated a bipolar temperature response at 130 ka, with colder-than-present temperatures in the North Atlantic and warmer-than-present temperatures in the Southern Ocean and over Antarctica. However, climate model simulations of this period have been unable to reproduce this response, when only orbital and greenhouse gas forcings are considered in a climate model framework. Using a full-complexity general circulation model we perform climate model simulations representative of 130 ka conditions which include a magnitude of freshwater forcing derived from data at this time. We show that this meltwater from the remnant Northern Hemisphere ice sheets during the glacial-interglacial transition produces a modelled climate response similar to the observed colder-than-present temperatures in the North Atlantic at 130 ka and also results in warmer-than-present temperatures in the Southern Ocean via the bipolar seesaw mechanism. Further simulations in which the West Antarctic Ice Sheet is also removed lead to warming in East Antarctica and the Southern Ocean but do not appreciably improve the model-data comparison. This integrated model-data approach provides evidence that Northern Hemisphere freshwater forcing is an important player in the evolution of early Last Interglacial climate.

Item Type: Article
Additional Information: This is Past4Future contribution no. 85.
Uncontrolled Keywords: 2016AREP; IA71
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Climate of the past
Volume: 12
Page Range: pp. 1919-1932
Identification Number: 10.5194/cp-12-1919-2016
Depositing User: Sarah Humbert
Date Deposited: 10 Apr 2017 21:19
Last Modified: 10 Apr 2017 21:19
URI: http://eprints.esc.cam.ac.uk/id/eprint/3909

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