Science, Space and Technology News 2024
Georgia Tech researchers have finished investigating how the prehistoric weakening of a major ocean current led to a decline in ocean nutrients and negative impacts on North Atlantic ocean life. The results support predictions about how our oceans might react to a changing climate — and what that means for ocean life. Credit: Georgia Tech / Jean Lynch-Stieglitz
Now, a team of researchers led by the Georgia Institute of Technology has conducted a first-of-its-kind investigation into the impact of a similar climate-induced decline nearly 13,000 years ago, when Earth exited the last ice age. By studying sediments buried at the Gulf Stream’s origin, they determined the prehistoric weakening led to a decline in ocean nutrients and negatively impacted ocean life.
“This concept has real-world implications for the future health of the oceans and fisheries,” Lynch-Stieglitz explains. Impacts range from a decline in fish populations to potentially impacting the amount of CO2 the ocean can uptake. However, the team didn’t initially set out with this goal in mind — the work began as an undergraduate research project with an intriguing mystery. Eric Blackmon, then a student in Lynch-Stieglitz’s lab, was interested in investigating the disappearance of a“The outcome of this study was puzzling,” Lynch-Stieglitz recalls. The team decided to use a rarely used technique to better understand the results.
The research showed that during the Younger Dryas, as the overturning circulation weakened, nutrients in the Gulf Stream decreased and the amount of oxygen in the Florida Straits increased. The team also found that as the nutrient stream decreased, the amount of biological productivity in the North Atlantic decreased as well.
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