Abstract
Looking for signs of ozone recovery
Highlights
Around a million years ago, large-scale ocean circulation changed dramatically during the switch from ~41,000- to ~100,000-year long glacial cycles
Pena and Goldstein analyzed the isotopic composition of neodymium in marine sediments from the South Atlantic
The results suggest how the contributions of deep water from northern and southern sources varied across the transition
Summary
Around a million years ago, large-scale ocean circulation changed dramatically during the switch from ~41,000- to ~100,000-year long glacial cycles. Pena and Goldstein analyzed the isotopic composition of neodymium in marine sediments from the South Atlantic. The results suggest how the contributions of deep water from northern and southern sources varied across the transition. The boundary between the two glacial states appears to have been marked by a dramatic weakening, perhaps even a shutdown, of deep-water currents. The boundary between the two glacial states appears to have been marked by a dramatic weakening, perhaps even a shutdown, of deep-water currents. — HJS
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