Editing IPCC:AR6/SR15/Chapter-3 (section)

==== 3.6.3.1 Sea ice ====

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Sea ice is often cited as a tipping point in the climate system (Lenton, 2012) <sup>[[#fn:r1356|1356]]</sup> . Detailed modelling of sea ice (Schröder and Connolley, 2007; Sedláček et al., 2011; Tietsche et al., 2011) <sup>[[#fn:r1357|1357]]</sup> , however, suggests that summer sea ice can return within a few years after its artificial removal for climates in the late 20th and early 21st centuries. Further studies (Armour et al., 2011; Boucher et al., 2012; Ridley et al., 2012) <sup>[[#fn:r1358|1358]]</sup> modelled the removal of sea ice by raising CO <sub>2</sub> concentrations and studied subsequent regrowth by lowering CO <sub>2</sub> . These studies suggest that changes in Arctic sea ice are neither irreversible nor exhibit bifurcation behaviour. It is therefore plausible that the extent of Arctic sea ice may quickly re-equilibrate to the end-of-century climate under an overshoot scenario.

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