2.2.3.2 Methane hydrate destabilisation

While there is potential for methane hydrate deposits in ocean sediments to be destabilised by warming, which could eventually have very large impacts on global temperature due to increases in atmospheric methane concentrations, current evidence and understanding suggests timescales of centuries to millennia for substantial impacts (Wang et al., 2023). Nevertheless, this process is included here for the purposes of calculating the contribution of methane hydrate destabilisation to global warming by 2100 and 2300 (2.2.5).

Methane hydrate dissociation could also potentially contribute to acidification in the deep ocean on long timescales (Garcia-Tigreros et al., 2021). Ocean acidification has potentially major implications for marine ecosystems due to impacts on calcifying organisms (Cooley et al., 2022), so these impacts could be further increased by methane hydrate dissociation in the long term.

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