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At the end of the last Ice Age, as the world began to warm, a swath of the North Pacific Ocean came to life.
During a brief pulse of biological productivity 14,000 years ago, this stretch of the sea teemed with phytoplankton, amoeba-like foraminifera and other tiny creatures, who thrived in large numbers until the productivity ended—as mysteriously as it began—just a few hundred years later.
Credit: Tiago Fioreze / Wikipedia
Researchers have hypothesized that iron sparked this surge of ocean life, but a new study led by Woods Hole Oceanographic Institution (WHOI) scientists and colleagues at the University of Bristol (UK), the University of Bergen (Norway), Williams College and the Lamont Doherty Earth Observatory of Columbia University suggests iron may not have played an important role after all, at least in some settings.
The study, published in the journal Nature Geoscience, determines that a different mechanism—a transient “perfect storm” of nutrients and light—spurred life in the post-Ice Age Pacific. Its findings resolve conflicting ideas about the relationship between iron and biological productivity during this time period in the North Pacific—with potential implications for geo-engineering efforts to curb climate change http://phys.org/tags/climate+change/ by seeding the ocean with iron.
More information: Transient stratification as the cause of the North Pacific productivity spike during deglaciation, Nature Geoscience, DOI: 10.1038/ngeo1873
Journal reference: Nature Geoscience
Provided by Woods Hole Oceanographic Institution
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