Climate Crisis, Biosphere & Societal Collapse

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Paris goal of 1.5°C warming is still too hot for polar ice sheets, study warns (news.mongabay.com)

submitted 3 months ago by wolfyvegan@slrpnk.net to c/collapse@sopuli.xyz

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At the landmark Paris climate agreement, nearly every country in the world pledged to a goal to limit warming to well below 2° Celsius (3.6° Fahrenheit) above preindustrial levels by 2100, and work toward a more ambitious goal to limit warming to 1.5°C (2.7°F). The hope is that such a limit will help Earth avoid the most catastrophic effects of climate change.

However, a recent review suggests that even the more ambitious ceiling of 1.5°C may be too warm for the planet’s polar ice sheets and trigger massive sea level rise.

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[–] humanspiral@lemmy.ca 1 points 3 months ago* (last edited 3 months ago)

While globe has warmed significantly since 2010, the Arctic has not significantly. Though starting in 2010, 3-5C warmer than 1995 with most of the warming from late August to April. Simply, as the Arctic loses ice, warmer oceans boost air temperatures that feed into warmer oceans, and slower refreezing in winter, with less maximum ice extent.

Arctic ice volume will decrease even if peak summer temperatures in Arctic don't change from post 2010 levels, which is about 1C higher than 1995 levels. About the same as global summer temperatures differentials in last 2 years. Even as 2023 and 2024 global temperatures made a large step up, Arctic temperatures are still clustered in post 2010 era.

Antactic sea ice has finally decreased starting in 2022. Similar feedbacks can occur, and much of the coast gets exposed in peak summer now.

Sea rise is about the land in polar areas. For Arctic, Baffin sea, Canadian Islands, and Hudson Bay temperatures and clearing are most impactful to Greenland. Antarctic, any clear ocean will impact it, but specific glacier shelves are more vulnerable to clear ocean impacts.