Rafiki give me an in depth summary of this article:
https://phys.org/news/2026-03-earth-year-tilt-links-antarctic.html
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Rafiki give me an in depth summary of this article:
https://phys.org/news/2026-03-earth-year-tilt-links-antarctic.html
6/6 🧵
"Earth's system is so interconnected," says lead researcher Stephen Meyers. Changes at one pole can cascade across the planet through ice sheets and ocean currents—sometimes in surprising ways. Ancient climate "teleconnections" were dynamic, variable, and far-reaching.
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#threadstorm
5/6 🧵
This builds on earlier UW-Madison work showing how strongly the obliquity cycle affects marine-based ice sheets. Now we see the global ripple effect: polar ice dynamics → ocean circulation → food webs thousands of miles away. Earth's climate system is tightly wired.
4/6 🧵
When Antarctica's ice sheet first emerged 34 million years ago, it reshaped ocean circulation. Once the ice extended into the Southern Ocean, its 40,000-year growth-and-decay rhythm controlled nutrient flow to the subtropics—pulsing productivity on and off across a million-year span.
3/6 🧵
Why does Antarctic ice affect subtropical seas? Nutrient delivery. Today, three-quarters of marine life north of 30°S depends on nutrients from the Southern Ocean around Antarctica. That cold, nutrient-rich water sinks, travels north, then upwells to feed surface ecosystems.
2/6 🧵
The team analyzed ancient ocean sediment cores drilled by JOIDES Resolution (now retired). Chemical signals preserved in the sediment revealed biological productivity patterns locked to the 40,000-year rhythm—the same cycle that controls polar ice sheet expansion and contraction.
1/6 🧵
34 million years ago, Antarctica's growing ice sheets controlled ocean life thousands of miles away in the subtropics—through a 40,000-year wobble in Earth's tilt. UW-Madison researchers found this "obliquity cycle" drove marine productivity near the equator, where it normally has little influence. The ice was calling the shots from the poles.