Under point 2. if by ‘positive feedback’ it is the ice-albedo positive feedback that is meant, then with the loss off ice this positive feedback is decreasing, not increasing. In other words, we have the ice-albedo positive feedback, responsible for Arctic amplification, only as long as there is snow/ice left.
Tamas Sent from my iPhone > On 27 Jan 2021, at 00:41, Andrew Lockley <[email protected]> wrote: > > > Geoengineering in the Canadian Arctic: > Governance Challenges > Jill Barclay > NAADSN Post-Graduate Fellow > Purpose: To explore the impacts of the potential deployment of Solar > Radiation Management (SRM), a form of > geoengineering, in the Canadian Arctic. > Although geoengineering technologies are potential remedial measures to > mitigate and slow climate change, > there remains no governance framework that can be applied to address the > impacts and costs of such projects. > This policy primer examines the potential use and governance of Solar > Radiation Management (SRM) to > increase albedo (reflectivity) in Canada’s Arctic region and divert incoming > solar radiation to slow the warming > of Arctic sea ice and permafrost. > This primer considers governance models that may be applied to SRM governance > in Canada. It is designed to > help inform policymakers and other stakeholders of important considerations > when contemplating > frameworks. Given the serious threats that climate change poses to human > security, Canada needs to be > prepared for the proposed use of geoengineering to address these increasingly > pressing issues. > The Critical Importance of the Arctic > The warming of the climate is being experienced worldwide; however, the rate > of climate change in the Arctic > is significantly higher than that of the rest of the globe. According to the > Fifth Assessment Report (A5) of the > Intergovernmental Panel on Climate Change (IPCC), the warming of the Arctic’s > ocean and atmosphere is > unequivocal and Arctic sea ice is vanishing at an increasingly accelerated > pace. > 1 The strongest warming is > found in the northern high-latitude regions, which includes the Canadian > Arctic. It is estimated that the > summer Arctic could be ice-free as early as the 2030s.2 > Because Arctic sea ice is crucial to balancing global climate systems, the > loss of ice cover would dramatically > and severely increase the positive feedback loop in the climate system, > further contributing to the warming > climate. Sunlight that would otherwise be reflected by sea ice would instead > be absorbed. Moreover, the > carbon dioxide (CO2)that is already circulating through the Earth’s climate > system will remain for millennia to > come. > 3 Further exacerbating the warming climate is the release of methane gas into > the atmosphere as sea ice > continues to melt. Methane, chemically known as CH4, is trapped within > permafrost and the Arctic seabed. > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/geoengineering/CAJ3C-062BP6cJ%3DHT2S-N6Ls-kZwfd6%2BLpkQRv%3D8njk2t0hXHpQ%40mail.gmail.com. > <Barclay-geoengineering-policy-primer.pdf> -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/DAB8B73C-AE75-4F54-91DE-6EBD7C065278%40googlemail.com.
