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Wednesday 2 August 2023
SEA LEVELS WERE 2 TO 6 METERS HIGHER SIX THOUSAND YEARS AGO
Two new studies have shown this to be the case. The idea that sea levels are rising to unprecedented levels is simply not true as the report below tells us.
This is entirely in keeping with what I learned in 'O' level geography more than half a century ago. We studied beach residues several metres above current sea level in a number of locations.
Asusming you are interpreting this study correctly, this tells me sea level rise is very sensitive to temperature. A 1 meter sea level rise is a really big deal.
Although an exact comparison cannot be made because of the global sea level rise projections, it is estimated that if current greenhouse gas emissions continue, sea level will rise by 1 m in AD 2100 from AD 1900 (Arias et al., 2021; Dura et al., 2021). The low-likelihood scenarios including ice-sheet instability processes could result in a 2-m rise in sea level.
Sea levels rose 10 metres above present levels during Earth’s last warm period 125,000 years ago, according to new research that offers a glimpse of what may happen under our current climate change trajectory.
Our paper, published today in Nature Communications, shows that melting ice from Antarctica was the main driver of sea level rise in the last interglacial period, which lasted about 10,000 years.
Rising sea levels are one of the biggest challenges to humanity posed by climate change, and sound predictions are crucial if we are to adapt.
This research shows that Antarctica, long thought to be the “sleeping giant” of sea level rise, is actually a key player. Its ice sheets can change quickly, and in ways that could have huge implications for coastal communities and infrastructure in future.
What this tells us is that sea levels can change without any human input. However much CO2 we stop emitting is not going to make any difference to the natural forces which are clearly beyond our control. All we can do is adapt to whatever happens.
No one is saying sea level changes won't change without human input. But they will change with co2 changes in the atmosphere. Ice cores show this clearly for the last 800,000 years.
This is entirely in keeping with what I learned in 'O' level geography more than half a century ago. We studied beach residues several metres above current sea level in a number of locations.
ReplyDeleteAsusming you are interpreting this study correctly, this tells me sea level rise is very sensitive to temperature. A 1 meter sea level rise is a really big deal.
ReplyDeletehttps://www.sciencedirect.com/science/article/pii/S2666033423000138
Although an exact comparison cannot be made because of the global sea level rise projections, it is estimated that if current greenhouse gas emissions continue, sea level will rise by 1 m in AD 2100 from AD 1900 (Arias et al., 2021; Dura et al., 2021). The low-likelihood scenarios including ice-sheet instability processes could result in a 2-m rise in sea level.
https://theconversation.com/scientists-looked-at-sea-levels-125-000-years-in-the-past-the-results-are-terrifying-126017
Sea levels rose 10 metres above present levels during Earth’s last warm period 125,000 years ago, according to new research that offers a glimpse of what may happen under our current climate change trajectory.
Our paper, published today in Nature Communications, shows that melting ice from Antarctica was the main driver of sea level rise in the last interglacial period, which lasted about 10,000 years.
Rising sea levels are one of the biggest challenges to humanity posed by climate change, and sound predictions are crucial if we are to adapt.
This research shows that Antarctica, long thought to be the “sleeping giant” of sea level rise, is actually a key player. Its ice sheets can change quickly, and in ways that could have huge implications for coastal communities and infrastructure in future.
What this tells us is that sea levels can change without any human input. However much CO2 we stop emitting is not going to make any difference to the natural forces which are clearly beyond our control. All we can do is adapt to whatever happens.
ReplyDeleteNo one is saying sea level changes won't change without human input. But they will change with co2 changes in the atmosphere. Ice cores show this clearly for the last 800,000 years.
ReplyDelete