Pumping Groundwater Has Altered Earth’s Tilt by 31.5 Inches — and That’s a Big Deal
Humans have long known that groundwater pumping affects water supplies, but a new study reveals that it can also significantly alter the planet’s rotation. As researchers uncover the surprising impact of groundwater on Earth’s tilt, it also offers fresh insights into climate change and sea-level rise.
A study published in Geophysical Research Letters shows that over the past two decades, the excessive pumping of groundwater has shifted Earth’s rotational axis by 31.5 inches, contributing to approximately 0.24 inches of sea-level rise.
Ki-Weon Seo, the lead geophysicist at Seoul National University, explains that “the redistribution of groundwater has the largest impact on the drift of the rotational pole among climate-related factors.” Essentially, as water moves from one region to another, it redistributes mass on the planet, much like adding weight to a spinning top, causing a shift in how Earth rotates.
This revelation builds on previous NASA findings from 2016, which first identified that shifting water could alter Earth’s rotation. Seo adds that while the discovery is intriguing, it also raises concern: “Pumping groundwater is another source of sea-level rise.”
The study, which looked at data from 1993 to 2010, found that 2,150 gigatons of groundwater had been pumped for irrigation and human consumption, with much of it eventually flowing into the oceans, contributing to rising sea levels.
The research also highlights how specific regions play a pivotal role in the changes. Water redistribution from areas like western North America and northwestern India has had a significant impact on Earth’s tilt.
The implications of this research could lead to a deeper understanding of how human activities affect the planet's rotation and, by extension, the environment. It may also offer new ways to address the ongoing challenges of climate change and sea-level rise.
As Seo points out, tracking Earth’s rotational pole could offer valuable insights into global water storage trends, potentially aiding conservation efforts and guiding actions to mitigate further sea-level rise.
With this new information, scientists can better comprehend the effects of groundwater movement and work toward solutions that prevent additional climate disruptions.