4 ms·

Would such collapse, by cooling Northern Atlantic, refreeze some of the sea around there and reduce Earth's albedo? I'm sure I'm not the first one to think abo

Would such collapse, by cooling Northern Atlantic, refreeze some of the sea around there and reduce Earth's albedo? I'm sure I'm not the first one to think about it

jmclnx 2y ago
I saw other places all it means is some parts of Europe may be cooler then what would be expected with the Temp Rise, but still warmer than say it was 100 years ago. Eventually Greenland will still loose its ice.
gmuslera 2y ago
The whole picture will be far more complex. In any case, we will go from the mostly stable system we had for the last 15-20k years to an increasingly more unstable one.
bikenaga 2y ago
As it happens, this just came out: "Impacts of Atlantic meridional overturning circulation weakening on Arctic amplification" - https://www.pnas.org/doi/10.1073/pnas.2402322121 https://www.pnas.org/doi/10.1073/pnas.2402322121 And the abstract: “Enhanced warming of the Arctic region relative to the rest of the globe, known as Arctic amplification, is caused by a variety of diverse factors, many of which are influenced by the Atlantic meridional overturning circulation (AMOC). Here, we quantify the role of AMOC changes in Arctic amplification throughout the twenty-first century by comparing two suites of climate model simulations under the same climate change scenario but with two different AMOC states: one with a weakened AMOC and another with a steady AMOC. We find that a weakened AMOC can reduce annual mean Arctic warming by 2 °C by the end of the century. A primary contributor to this reduction in warming is surface albedo feedback, related to a smaller sea ice loss due to AMOC slowdown. Another major contributor is the changes in ocean heat uptake. The weakened AMOC and its associated anomalous ocean heat transport divergence lead to increased ocean heat uptake and surface cooling. These two factors are inextricably linked on seasonal timescales, and their relative importance for Arctic amplification can vary by season. The weakened AMOC can also abate Arctic warming via lapse rate feedback, creating marked cooling from the surface to lower-to-mid troposphere while resulting in relatively weaker cooling in the upper troposphere. Additionally, the weakened AMOC increases the low-level cloud fraction over the North Atlantic warming hole, causing significant cooling there via shortwave (sw) cloud feedback despite the overall effect of sw cloud feedback being a slight warming of the average temperature over the Arctic.”

Would such collapse, by cooling Northern Atlantic, refreeze some of the sea around there and reduce Earth's albedo? I'm sure I'm not the first one to think about it

jmclnx 2y ago

I saw other places all it means is some parts of Europe may be cooler then what would be expected with the Temp Rise, but still warmer than say it was 100 years ago. Eventually Greenland will still loose its ice.

gmuslera 2y ago

The whole picture will be far more complex. In any case, we will go from the mostly stable system we had for the last 15-20k years to an increasingly more unstable one.

bikenaga 2y ago

As it happens, this just came out: "Impacts of Atlantic meridional overturning circulation weakening on Arctic amplification" - https://www.pnas.org/doi/10.1073/pnas.2402322121 https://www.pnas.org/doi/10.1073/pnas.2402322121 And the abstract: “Enhanced warming of the Arctic region relative to the rest of the globe, known as Arctic amplification, is caused by a variety of diverse factors, many of which are influenced by the Atlantic meridional overturning circulation (AMOC). Here, we quantify the role of AMOC changes in Arctic amplification throughout the twenty-first century by comparing two suites of climate model simulations under the same climate change scenario but with two different AMOC states: one with a weakened AMOC and another with a steady AMOC. We find that a weakened AMOC can reduce annual mean Arctic warming by 2 °C by the end of the century. A primary contributor to this reduction in warming is surface albedo feedback, related to a smaller sea ice loss due to AMOC slowdown. Another major contributor is the changes in ocean heat uptake. The weakened AMOC and its associated anomalous ocean heat transport divergence lead to increased ocean heat uptake and surface cooling. These two factors are inextricably linked on seasonal timescales, and their relative importance for Arctic amplification can vary by season. The weakened AMOC can also abate Arctic warming via lapse rate feedback, creating marked cooling from the surface to lower-to-mid troposphere while resulting in relatively weaker cooling in the upper troposphere. Additionally, the weakened AMOC increases the low-level cloud fraction over the North Atlantic warming hole, causing significant cooling there via shortwave (sw) cloud feedback despite the overall effect of sw cloud feedback being a slight warming of the average temperature over the Arctic.”