Shakun on our wobbly world’s precession, ocean CO2 fizzing, the last ice age, and all that

It seems that the author of the recent paper in Nature (Shakun et al ) says that the Earth’s wobble was a contributor for ending the ice age, but won’t go so far as to call it the trigger. But I’m not even sure he can claim much of anything, because Willis has found some serious issues with the Shakun et al paper which you can read about here. It seems to me, based on the proxies and methods used, Shakun is just making a SWAG. Of course we’ll know more about the certainty as the paper is dissected in greater detail – Anthony

From National Public Radio- Shake It Off: Earth’s Wobble May Have Ended Ice Age

(h/t to WUWT reader Paul Bell)

by Christopher Joyce NPR

Precession – the slow and gradual shift of Earth’s axis through a 26,000-year cycle.
When viewed from outside and looking down onto the Earth from the north, the direction of precession is clockwise. When standing on Earth looking outward, the axis appears to move counter-clockwise across the sky. Image from mydarksky.org (original image with the NPR story could not be used due to licensing issues – Anthony)

The last big ice age ended about 11,000 years ago, and not a moment too soon — it made a lot more of the world livable, at least for humans.

But exactly what caused the big thaw isn’t clear, and new research suggests that a wobble in the Earth kicked off a complicated process that changed the whole planet.

Ice tells the history of the Earth’s climate: Air bubbles in ice reveal what the atmosphere was like and what the temperature was. And scientists can read this ice, even if it’s been buried for thousands of years.

But when it comes to the last ice age, ice has a mixed message.

See more

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