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Iron’s⁤ Shifting Sources in the South Pacific Shaped Earth’s Climate Over 93 Million Years

A new‍ study published by researchers at the University of Hawai’i (UH) ⁣at Mānoa reveals the critical role of iron in Earth’s climate history, demonstrating how its sources in the south Pacific Ocean have changed over the past 93 million years. This groundbreaking research, based on the analysis of deep-sea sediment cores, provides crucial insights into ⁤the interplay between iron, marine life, and atmospheric carbon ⁢dioxide levels.

The Importance of iron in Marine Ecosystems

Iron is an essential nutrient for marine ⁣life, particularly phytoplankton. Phytoplankton are microscopic plants ‍that form the base ‍of ⁢the marine food web and play a vital role ‍in regulating atmospheric carbon dioxide. They absorb CO2 during⁣ photosynthesis, effectively removing it from the atmosphere. ⁢ The availability‍ of iron directly impacts phytoplankton⁣ growth, and therefore, the ocean’s capacity to absorb carbon dioxide.

While the importance of iron is ⁤well-established today, understanding how past iron availability shaped the⁢ marine ecosystem and ⁤influenced climate has been a ⁣significant challenge.⁢ This new study addresses that gap by reconstructing ‍the history ⁣of ‍iron ‍sources in a key oceanic region.

Analyzing ⁣Deep-Sea Sediment Cores

To investigate the long-term history ⁤of oceanic‍ iron,‍ the researchers meticulously analyzed iron isotopes in three deep-sea sediment cores from the South Pacific. Choosing a location far from continental influences was crucial to isolate the impact of oceanic sources of iron.

“Over the past 93 ⁢million years, we found that ⁣five primary sources of iron have influenced the South pacific Ocean: dust, iron from⁤ far off ocean sources, two distinct hydrothermal sources, and volcanic ash,” explained Logan Tegler,⁢ the lead author and oceanography postdoctoral researcher in the UH Mānoa School of Ocean and Earth science and Technology. “These ‍sources shifted over time as⁢ the sites gradually migrated away from