The Earth moved, but not that much!

My last blog post covered a dramatic shift in the location of the North Pole, and a change in the direction in which Earth’s axis is migrating, and the wording of the original articles, and subsequent secondary and tertiary articles has been the source of some confusion.

The 75˚ shift refers to the change in direction of polar drift, NOT change in location of the pole. It’s a big change in direction, but nowhere near the kind of change we would see if Earth’s equator suddenly ran through the Arctic and Antarctic. We probably would have felt that.

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Everything is caused by global warming

No really though. It’s always been clear that the worldwide melting of glaciers and ice sheets was going to have some effect on Earth’s crust. Like some other impacts of climate change, it’s a pretty straightforward concept – the crust is a relatively thin layer of solid stuff on top of the molten goo that makes up most of the planet’s bulk, so massive chunks of ice press the layer down. Reduce the ice mass, and the crust rises up a bit.

From there it’s not much of a stretch to predict some change in seismic and volcanic activity as a result.

What had not occurred to me was that this redistribution of mass could actually result in changes in how the Earth moves through space. New research published in Science Advances (yay open access!) indicates that the loss of ice mass in Greenland and West Antarctica, coupled with a gain in ice mass in East Antarctica, has shifted the North Pole towards the UK in the last decade, a change from the direction it was moving for most of the 20th century.

This isn’t a big enough shift to cause problems, bit it is an indication of the scale of the changes that are occurring, thanks to human-caused climate change.