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

==== 3.5.5.1 Arctic sea ice ====

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Collins et al. (2013) <sup>[[#fn:r1225|1225]]</sup> discussed the loss of Artic sea ice in the context of potential tipping points. Climate models have been used to assess whether a bifurcation exists that would lead to the irreversible loss of Arctic sea ice (Armour et al., 2011; Boucher et al., 2012; Ridley et al., 2012) <sup>[[#fn:r1226|1226]]</sup> and to test whether the summer sea ice extent can recover after it has been lost (Schröder and Connolley, 2007; Sedláček et al., 2011; Tietsche et al., 2011) <sup>[[#fn:r1227|1227]]</sup> . These studies did not find evidence of bifurcation or indicate that sea ice returns within a few years of its loss, leading Collins et al. (2013) <sup>[[#fn:r1228|1228]]</sup> to conclude that there is ''little evidence'' for a tipping point in the transition from perennial to seasonal ice cover. No evidence has been found for irreversibility or tipping points, suggesting that year-round sea ice will return given a suitable climate ( ''medium confidence'' ) (Schröder and Connolley, 2007; Sedláček et al., 2011; Tietsche et al., 2011) <sup>[[#fn:r1229|1229]]</sup> .

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