Simulated effects of solar geoengineering on ocean acidification

doi:10.12006/j.issn.1673-1719.2018.066

Abstract

Abstract:

To have a more complete evaluation of the solar geoengineering effect on global climate, it is of great importance to examine the effects of geoengineering on ocean acidification. In this study the UVic Earth System Model was used to simulate the effects of solar geoengineering on sea surface pH and aragonite (a metastable form of calcium carbonate) saturation (Ω). We run the UVic model from pre-industrial to the year 2100 under RCP8.5 scenario, and quantified the effects of individual environment factors on ocean acidification. The simulations show that by the year 2100, relative to pre-industrial levels, global mean sea surface pH would decrease by 0.43 and Ω state will decrease by 1.77. Relative to the RCP8.5 scenario without geoengineering, by the year 2100, solar geoengineering would increase sea surface pH by 0.003, but decrease Ω by 0.16. Relative to the RCP8.5 scenario without geoengineering, geoengineering-induced increase of dissolved inorganic carbon would decrease pH and Ω, but the increase of alkalinity would increase pH and Ω. Geoengineering-induced decrease of temperature would increase pH but decrease Ω. The net effect of solar geoengineering on pH and Ω is small. Our study indicates that solar geoengineering could cool the earth but fails to mitigate ocean acidification.

Key words: Geoengineering, Solar radiation management, Ocean acidification, Climate change, Earth system simulation

Zuo-Long WEN,Jiu JIANG,Long CAO. Simulated effects of solar geoengineering on ocean acidification[J]. Climate Change Research, 2019, 15(1): 41-53.

Figures/Tables 10

Fig. 1 pH and aragonite saturation state (Ω), as a function of environment factors based on the OCMIP project

Fig. 2 Latitude-depth distribution of ocean carbonate chemistry variables with UVic model simulation (1990-1999) and GLODAP observation

Fig. 3 Time series of variables in Hist+RCP8.5 and SRM simulated experiments

Fig. 4 Simulated results of two experiments as well as their difference in the periods 2090-2100

Fig. 5 Simulated results of two experiments in the periods 2090-2100 relative to the periods 1800-1810, as well as their difference in the periods 2090-2100

Table 1 Model simulated results in the periods 1810-1810 and 2090-2100

Fig. 6 Time series of geoengineering-induced effects (SRM simulated experiment) of each single environment factor change on pH and Ω (relative to Hist+RCP8.5 simulated experiment)

Table 2 Geoengineering-induced effects and their percentages of each single environment factor change on pH and Ω in the periods 2090-2100, and the effects of all environment factors changing simultaneously

Fig. 7 Geoengineering-induced effects (SRM simulated experiment) of each single environment factor change on pH and Ω (relative to Hist+RCP8.5 simulated experiment) in the period 2090-2100

Fig. 8 Time series of NADW in Hist+RCP8.5 and SRM simulated experiments

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