I extend the reduced Greenland ice sheet (GIS) model-module of DICE-GIS (Nordhaus, Proc Natl Acad Sci 25(116):12261–12269, 2019) by integrating snow-albedo feedback (SAF) and potential tipping of the ice sheet into the resuming DICE-GIS SAF model. The increasing global temperature no longer only results in the melting of the GIS, but also in albedo loss, which in turn impacts the strength of the SAF. As a consequence, global warming and the melting of the ice accelerate. The social cost of carbon (SCC) increases because the economic damages are not only related to intensified sea level rise, but also to accelerated global temperature rise. Accounting for the SAF raises the SCC from 37 to 41 $/t CO2 in 2020, an increase of 11%. The temperature increase is the key channel through which the SAF impacts the SCC. The long-term volume of the GIS decreases by 2%, while the additional inclusion of tipping reduces it further by up to 35%.

中文翻译：

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格陵兰冰盖融化造成的反照率损失和碳的社会成本

我通过整合雪反照率反馈 (SAF) 和冰的潜在倾翻，扩展了 DICE-GIS (Nordhaus, Proc Natl Acad Sci 25(116):12261–12269, 2019) 的缩减格陵兰冰盖 (GIS) 模型模块表到正在恢复的 DICE-GIS SAF 模型中。全球温度升高不仅会导致 GIS 融化，还会导致反照率损失，进而影响 SAF 的强度。结果，全球变暖和冰层融化加速。碳的社会成本 (SCC) 增加，因为经济损失不仅与海平面上升加剧有关，而且与全球温度加速上升有关。考虑到 SAF，2020 年 SCC 从 37 美元/吨二氧化碳增加到 41 美元/吨，增加了 11%。温度升高是 SAF 影响 SCC 的关键渠道。