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

Citation

Kravitz, B and Rasch, PJ and Wang, H and Robock, A and Gabriel, C and Boucher, O and Cole, JNS and Haywood, J and Ji, D and Jones, A and Lenton, A 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, The climate effects of increasing ocean albedo: an idealized representation of solar geoengineering, Atmospheric Chemistry and Physics, 18 pp. 13097-13113. ISSN 1680-7316 (2018) [Refereed Article]


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DOI: doi:10.5194/acp-18-13097-2018

Abstract

Geoengineering, or climate intervention, describes methods of deliberately altering the climate system to offset anthropogenic climate change. As an idealized representation of near-surface solar geoengineering over the ocean, such as marine cloud brightening, this paper discusses experiment G1 ocean-albedo of the Geoengineering Model Intercomparison Project (GeoMIP), involving an abrupt quadrupling of the CO2 concentration and an instantaneous increase in ocean albedo to maintain approximate net top-of atmosphere radiative flux balance. A total of 11 Earth system models are relatively consistent in their temperature, radiative flux, and hydrological cycle responses to this experiment. Due to the imposed forcing, air over the land surface warms by a model average of 1.14 K, while air over most of the ocean cools. Some parts of the near-surface air temperature over ocean warm due to heat transport from land to ocean. These changes generally resolve within a few years, indicating that changes in ocean heat content play at most a small role in the warming over the oceans. The hydrological cycle response is a general slowing down, with high heterogeneity in the response, particularly in the tropics. While idealized, these results have important implications for marine cloud brightening, or other methods of geoengineering involving spatially heterogeneous forcing, or other general forcings with a strong landľocean contrast. It also reinforces previous findings that keeping top-of-atmosphere net radiative flux constant is not sufficient for preventing changes in global mean temperature.

Item Details

Item Type:Refereed Article
Keywords:geoengineering, climate models, ocean, Geoengineering Model Intercomparison Project, GeoMIP
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climate Change Processes
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Mitigation Strategies
Author:Phipps, S (Dr Steven Phipps)
ID Code:128758
Year Published:2018
Deposited By:Oceans and Cryosphere
Deposited On:2018-10-10
Last Modified:2018-10-11
Downloads:0

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