Evidence that deep-sea blackcarbon comes from hydrothermalvents HokkaidoUni ScienceAdvances
in the ocean," explains Ogawa."We were interested in a portion of this pool, known as dissolved black carbon , which cannot be utilized by organisms. The source of DBC in the deep sea was unknown, although hydrothermal vents were suspected to be involved."
The researchers analyzed the distribution of DBC in the ocean basins of the North Pacific Ocean and Eastern South Pacific Ocean, and compared the data with previously reported concentrations of a helium isotope that is associated with hydrothermal vent emissions, as well as oxygen utilization in these areas.Their findings showed that hydrothermal vents were an important source of DBC in the Pacific Ocean.
"Most importantly, our research indicates that the DBC from hydrothermal vents is an important source of dissolved organic carbon in the. In terms of DBC inputs to the ocean, hydrothermal vents may contribute up to half as much DBC as that which is formed by biomass burning or fossil fuel combustion and subsequently transported via rivers or atmospheric deposition," concluded Yamashita.
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