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A comment on Researchers reached the bottom of ice sheet at -2670M after 7 years of drilling. Parent comment

Re:Researchers reached the bottom of ice sheet at -2670M aft... by zosima on Tuesday August 01, 2023 @08:53AM (#36955334)
This is a very interesting read:

https://www.cambridge.org/core/journals/journal-of-glaciolog...

They have found some meltwater layers with unexpectedly large quantities of CO2 > 750ppm.

But they also show that there is unexpected heavy diffusion around the meltwater layers. And they argue very compellingly, that the ice core CO2 records have been smoothed through natural diffusion.

Why is this information not given when showing this graph?

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Re:Researchers reached the bottom of ice sheet at -2670M aft... by MichaelZuo on Tuesday August 01, 2023 @09:21AM (#36955605)
>750 ppm CO2 is incredible, if that's true it's no wonder that interglacial maximums could have been 5 degrees warmer than present day.

What's the causal explanation behind that much CO2 though? Super-volcano eruptions?

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Re:Researchers reached the bottom of ice sheet at -2670M aft... by zosima on Tuesday August 01, 2023 @09:36AM (#36955782)
They explain in the paper. It's very likely an artifact.

But from the layers around it, it becomes clear that through the years these high CO2 bubbles leak CO2 to nearby layers.

And so CO2 may very well have been just as high as it is currently, but due to changes in the ice, CO2 highs have been lowered and CO2 lows been raised.

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Re:Researchers reached the bottom of ice sheet at -2670M aft... by MichaelZuo on Tuesday August 01, 2023 @10:04AM (#36956087)
But in the case it's not an artifact?
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