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Biologists Learn More About the Carbon Cycle by Studying Carbon Consumption of Bacterioplankton

Source: Phys.org/Julie Cohen - March 20, 2017 in Science/Tech

Biologists Learn More About the Carbon Cycle by Studying Carbon Consumption of Bacterioplankton
Photo: NASA Goddard Space Flight Center

The oceans are great at absorbing carbon dioxide (CO2) from the air, but when their deep waters are brought to the surface, the oceans themselves can be a source of this prevalent greenhouse gas.

Wind patterns together with the Earth’s rotation drive deep water—and the CO2 it sequesters—upward, replacing surface water moving offshore. A process known as upwelling, it occurs on the west coasts of continents. And it’s part of a never-ending loop in which CO2 levels in the rise and fall in a natural rhythm.

But when CO2 levels rise, ocean pH falls, causing ocean acidification. Seeking to explore how short-term periods of elevated CO2 from upwelling impact the bacteria in the water, UC Santa Barbara researchers found that the additional CO2—and corresponding drop in pH—increased the respiration of these organisms. This means more resources are recycled rather than retained in the . The results appear in the journal PLOS ONE.

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