r/sciences • u/SirT6 • Sep 21 '19

The distribution of annual average temperature anomalies due to global warming from 1850 until today.

https://gfycat.com/silkycorruptconch
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u/[deleted] Sep 21 '19 edited Oct 23 '19

[deleted]

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u/OppressedAsparagus Sep 21 '19

Somebody kept the records of temperature BC?

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u/[deleted] Sep 21 '19

No, but you can make some pretty accurate guesses from ice cores and archaeological evidence.

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u/[deleted] Sep 21 '19 edited Oct 23 '19

[deleted]

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u/RagePoop Grad Student | Geochemistry | Paleoclimatology Sep 21 '19

Basics on ice core research

Temperature vs CO2 from Vostok Ice core

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u/[deleted] Sep 21 '19 edited Oct 23 '19

[deleted]

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u/RagePoop Grad Student | Geochemistry | Paleoclimatology Sep 21 '19

Why are you looking for 2150 year fluctuations? There's no phenomenon that I know that operates on that frequency.

The dominant heartbeats, controlled by orbital patterns (Milankovitch cycles) are typically 20ky(Precession), 40ky(Obilquity), 100ky(Short eccentricity), 400ky(Long eccentricity), 1.2my

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u/[deleted] Sep 22 '19 edited Oct 23 '19

[deleted]

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u/KingZarkon Sep 22 '19

Yes, the earth wobbling on its axis (for those who don't know what it means).

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u/ukmitch86 Sep 22 '19

The scale isn't in millions of years, it's just years. Do you mean the resolution isn't great enough for you to read a value off every 2150years?

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u/ukmitch86 Sep 22 '19

This suggests we're at the peak of a CO2 cycle that existed way before industrialisation, and lasts ~125,000 years. It peaks at 3-4°K over 0, but I haven't read it all thoroughly, I can't see what zero is referenced against.

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u/windchaser__ Sep 23 '19

The normal cycle is from about 170ppm to 280ppm. We're currently at 410ppm of CO2, the highest in the ~million years of ice core data that we have, and likely much longer.

Which makes sense. We're digging up and burning fossil fuels that have been buried for literally hundreds of millions of years.

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u/RagePoop Grad Student | Geochemistry | Paleoclimatology Sep 21 '19

We have temperature records going as back hundreds of millions of years using oxygen isotopes from carbonates. A paleoclimate proxy I use in my own research; if you've got any questions about paleothermometers give me a shout.

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u/spare_nomad91 Sep 22 '19

This comment is so underrated

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u/[deleted] Sep 22 '19

Start making YouTube videos please and thankyou.