Ice core scientists in East Greenland reach bedrock

Post by zosima » Tue, Aug 01, 2023, 12:53 PM UTC

japanuspus wrote: post #282

zosima wrote: post #263

Earlier quoted context omitted.

One of the many misleading things done by climate scientists is to splice together data derived via different measurement methods. The CO2 curve 800000 years back is an excellent example. CO2 in air bubbles in ice will diffuse into the ice during the many millenia the ice have been stored under pressure. You can therefore expect the ice core CO2 to be lower than hypothetical atmospheric measurements at the same time.…

Not sure if you are trolling of really believe this to be true, but for anyone else assuming good faith: The diffusion aspect is (of course) well-modeled, see e.g. references under "past greenhouse gasses" at [0]. [0]: https://www.antarcticglaciers.org/glaciers-and-climate/ice-c...

Post by MichaelZuo » Tue, Aug 01, 2023, 1:26 PM UTC

gottorf wrote: post #218

mytailorisrich wrote: post #137

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The point is that net zero is most likely not going to stop warming with 400+ppm CO2 in the atmosphere. CO2 concentration most likely has to drop but naturally it does so very slowly. Arguably at this point we already need cooling because 40+C every summer in half of Europe (for instance) is getting annoying...

> at this point we already need cooling A colossal volcanic eruption could do the trick, and those seem to happen rather unnervingly frequently.

Post by toshk » Tue, Aug 01, 2023, 1:33 PM UTC

hnhg wrote: post #286

toshk wrote: post #119

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Yeah but there is more to it. There are active crisis, like cancer & heart disease. Or upcoming ones like Alzeimer & Parkinson. That in the current day already affect more people per year, then the climate crisis will affect in the worst prognoses in a 100 years*. But Climate change is different, it speaks to the psyche of humans, the modern story of the flood. And in the same way it gives people meaning & without re…

Can you provide the citations for that? Migration forecasts are absolutely enormous [1] and 10 million seems very low in terms of relation to the numbers and how humanity will react to it all. Just think of the current reactions to migration currently and multiply that 10-fold or more. And I can see that happening in the next 20 years. [1] this is just one I found from a quick search, there is a lot more out there: h…

Post by blackkettle » Tue, Aug 01, 2023, 1:44 PM UTC

TheRealPomax wrote: post #126

blackkettle wrote: post #101

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The article definitely makes it sound like they had “boots on the ground”. There’s a picture of muddy boots and the caption says they are covered in ancient mud.

You need to clear a lot of snow before you can stand on the ice that you're drilling in (You can't drill straight if your rig's sitting on snow, you need to dig until you hit solid ground, and in this case the ground is ice). That's the "boots on the ground" part. They were physically there to do the drilling (as opposed to giant automated core drillers such as DISC[1], which don't require "boots on the ground" so mu…

Post by MichaelZuo » Tue, Aug 01, 2023, 2:04 PM UTC

zosima wrote: post #316

MichaelZuo wrote: post #312

Earlier quoted context omitted.

>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?

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 highs are diminished in the ice core record and CO2 lows have been raised.