2.2.2.2 Sea ice

Sea ice hosts unique ecosystems and plays a central role in marine life, influencing marine organisms and food webs by impacting on the penetration of light into the ocean and supplies of nutrients and organic matter (Cooley et al., 2022). Ongoing reductions in Arctic sea ice due to rising temperatures can therefore be expected to have direct impacts on biodiversity in the Arctic ocean. Moreover, reductions in sea ice cover in the Arctic lead to increased temperatures in the region due to decreased surface albedo, especially in summer when ice extent is at its annual low and daylight hours are long. This ice-albedo feedback is a key reason for the regional warming in the Arctic being four times the global rate of warming over the last four decades (Rantanen et al., 2022), contributing to the impacts of rising temperatures on ecosystems in the region and also potentially influencing climate change impacts at global scales by increasing the net energy imbalance of the planet. Reductions in summer sea ice have economic implications by opening routes for shipping and increasing access for fossil fuel extraction and export (Challinor and Benton, 2021), as well as mineral extraction. Arctic warming also has the potential to impact the jet stream and hence affect regional climates beyond its borders, although the current and future impacts of this remain uncertain (Barnes and Screen, 2015).

Bezos Earth Fund University of Exeter logo
Earth Commission Systems Change Lab logo Systemiq logo
Global Tipping Points logo
Share this content
Top