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Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation

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Hong, Y, Moore, JC, Jevrejeva, S, Ji, D, Phipps, SJ ORCID: 0000-0001-5657-8782, Lenton, A, Tilmes, S, Watanabe, S and Zhao, L 2017 , 'Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation' , Environmental Research Letters, vol. 12, no. 3 , pp. 1-8 , doi: 10.1088/1748-9326/aa5fb8.

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Abstract

We analyze the multi-earth system model responses of ocean temperatures and the Atlantic Meridional Overturning Circulation (AMOC) under an idealized solar radiation management scenario (G1) from the Geoengineering Model Intercomparison Project. All models simulate warming of the northern North Atlantic relative to no geoengineering, despite geoengineering substantially offsetting the increases in mean global ocean temperatures. Increases in the temperature of the North Atlantic Ocean at the surface (~0.25 K) and at a depth of 500 m (~0.10 K) are mainly due to a 10 Wm−2 reduction of total heat flux from ocean to atmosphere. Although the AMOC is slightly reduced under the solar dimming scenario, G1, relative to piControl, it is about 37% stronger than under abrupt4 × CO2 . The reduction of the AMOC under G1 is mainly a response to the heat flux change at the northern North Atlantic rather than to changes in the water flux and the wind stress. The AMOC transfers heat from tropics to high latitudes, helping to warm the high latitudes, and its strength is maintained under solar dimming rather than weakened by greenhouse gas forcing acting alone. Hence the relative reduction in high latitude ocean temperatures provided by solar radiation geoengineering, would tend to be counteracted by the correspondingly active AMOC circulation which furthermore transports warm surface waters towards the Greenland ice sheet, warming Arctic sea ice and permafrost.

Item Type: Article
Authors/Creators:Hong, Y and Moore, JC and Jevrejeva, S and Ji, D and Phipps, SJ and Lenton, A and Tilmes, S and Watanabe, S and Zhao, L
Keywords: geoengineering, Atlantic Meridional Overturning Circulation, Earth system models, Geoengineering Model Intercomparison Project
Journal or Publication Title: Environmental Research Letters
Publisher: Institute of Physics Publishing Ltd.
ISSN: 1748-9326
DOI / ID Number: 10.1088/1748-9326/aa5fb8
Copyright Information:

© 2017 IOP Publishing. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/

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