So- I’m actually not too familiar with how precise ice core measurements are. If you have something specific you think I should read I’d love to see. I’m also recovering from getting my wisdom teeth out, so I can’t spend too long looking for information.

this (preprint) paper says:

broadly speaking, the shortest resolvable signal at high-accumulation sites is about one decade Trudinger, Etheridge, et al. 2002). At the lowest accumulation sites, centennial-scales features are markedly smoothed but still resolvable Nehrbass-Ahles et al. 2020

The British Antarctic Survery says:

The fastest natural increase measured in older ice cores is around 15ppm (parts per million) over about 200 years. For comparison, atmospheric CO2 is now rising 15ppm every 6 years.

Which- to me- says it jumping 100+ ppm for a few decades and then returning would leave evidence behind? And like, why would it jump so drastically?

I don’t know, sorry if this isn’t a lot of information, I really need to go lay down now.

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