Brief communication: Solar radiation management not as effective as CO 2 mitigation for Arctic sea ice loss in hitting the 1.5 and 2 °C COP climate targets

Ridley, Jeff K.; Blockley, Edward W.

An assessment of the risks of a seasonally ice-free Arctic at 1.5 and 2.0 inline-formulaC global warming above pre-industrial levels is undertaken using model simulations with solar radiation management to achieve the desired temperatures. An ensemble of the CMIP5 model HadGEM2-ES uses solar radiation management (SRM) to achieve the desired global mean temperatures. It is found that the risk for a seasonally ice-free Arctic is reduced for a target temperature for global warming of 1.5 inline-formulaC (0.1 %) compared to 2.0 inline-formulaC (42 %), in general agreement with other methodologies. The SRM produced more ice loss, for a specified global temperature, than for inline-formulaCO2 mitigation scenarios, as SRM produces a higher polar amplification.

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Ridley, Jeff K. / Blockley, Edward W.: Brief communication: Solar radiation management not as effective as CO2 mitigation for Arctic sea ice loss in hitting the 1.5 and 2 °C COP climate targets. 2018. Copernicus Publications.

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