1.2.3 Final remarks

With continued global warming, all parts of the cryosphere will be at increasing risk of further decline. For some parts of the cryosphere (like the ice sheets), this is likely to be characterised by tipping dynamics, while for others (like Arctic sea ice), it will occur gradually but surely, following the global warming trajectory. Due to the long response times of these systems, certain cryospheric elements are linked to committed long-term impacts. Major risks for each of the cryosphere elements for different levels of global warming are summarised in Figure 1.2.16. What is evident: despite the different dynamics and characteristics of ice sheet retreat, glacier decline, sea ice loss and permafrost thaw, the consequences of climate-induced changes in the cryosphere will be far-reaching and impact the livelihoods of millions of people.

Figure: 1.2.16
Figure 1.2.16: Increasing risks for cryosphere tipping elements with global warming. Potential thresholds (for ice sheets, glaciers, sea ice and permafrost) and impacts (long-term committed sea level rise and carbon release) are shown for different levels of global warming. Values for glacier thresholds, sea level commitment, Arctic summer sea ice, and land permfrost (for surface permafrost) are from Kloenne et al. (2023), land permafrost carbon release estimates are from Nitzbon et al. (2023), and SSP emission scenarios are from IPCC (2021). Sea level rise is 2000 yr commitment including thermosteric contribution with respect 1995-2014, and permafrost carbon release is relative to1850-1900.” This figure is inspired by Kloenne et al., (2023).
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