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The climate effects of increasing ocean albedo: an idealized representation of solar geoengineering

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Kravitz, B, Rasch, PJ, Wang, Hailong, Robock, A, Gabriel, C, Boucher, O, Cole, JNS, Haywood, J, Ji, D, Jones, A, Lenton, AA, Moore, JC, Muri, H, Niemeier, U, Phipps, S ORCID: 0000-0001-5657-8782, Schmidt, H, Watanabe, S, Yang, S and Yoon, J-H 2018 , 'The climate effects of increasing ocean albedo: an idealized representation of solar geoengineering' , Atmospheric Chemistry and Physics, vol. 18 , pp. 13097-13113 , doi: 10.5194/acp-18-13097-2018.

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Abstract

Geoengineering, or climate intervention, describesmethods of deliberately altering the climate system to offsetanthropogenic climate change. As an idealized representationof near-surface solar geoengineering over the ocean,such as marine cloud brightening, this paper discusses experimentG1 ocean-albedo of the Geoengineering Model IntercomparisonProject (GeoMIP), involving an abrupt quadruplingof the CO2 concentration and an instantaneous increasein ocean albedo to maintain approximate net top-of atmosphereradiative flux balance. A total of 11 Earth systemmodels are relatively consistent in their temperature, radiativeflux, and hydrological cycle responses to this experiment.Due to the imposed forcing, air over the land surfacewarms by a model average of 1.14 K, while air over mostof the ocean cools. Some parts of the near-surface air temperatureover ocean warm due to heat transport from land toocean. These changes generally resolve within a few years,indicating that changes in ocean heat content play at most asmall role in the warming over the oceans. The hydrologicalcycle response is a general slowing down, with high heterogeneityin the response, particularly in the tropics. Whileidealized, these results have important implications for marinecloud brightening, or other methods of geoengineeringinvolving spatially heterogeneous forcing, or other generalforcings with a strong land–ocean contrast. It also reinforcesprevious findings that keeping top-of-atmosphere net radiative flux constant is not sufficient for preventing changes inglobal mean temperature.

Item Type: Article
Authors/Creators:Kravitz, B and Rasch, PJ and Wang, Hailong and Robock, A and Gabriel, C and Boucher, O and Cole, JNS and Haywood, J and Ji, D and Jones, A and Lenton, AA and Moore, JC and Muri, H and Niemeier, U and Phipps, S and Schmidt, H and Watanabe, S and Yang, S and Yoon, J-H
Keywords: geoengineering, climate models, ocean, Geoengineering Model Intercomparison Project, GeoMIP
Journal or Publication Title: Atmospheric Chemistry and Physics
Publisher: Copernicus GmbH
ISSN: 1680-7316
DOI / ID Number: 10.5194/acp-18-13097-2018
Copyright Information:

Copyright 2018 Author(s). Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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