Hydrothermal-derived black carbon as a source of recalcitrant dissolved organic carbon in the ocean.

ABSTRACT: Deep-sea hydrothermal vents are a possible source of thermogenic dissolved black carbon (DBC), which is a component of recalcitrant dissolved organic carbon, but little is known about the distribution of hydrothermal DBC in the deep ocean. Here, we show basin-scale distributions of DBC along two transects in the eastern Pacific Ocean, which are located outside the jet-like hydrothermal plumes from the East Pacific Rise. The DBC concentration in the deep waters did not show a strong linear relationship with apparent oxygen utilization (AOU), as previously observed in the central and western Pacific Ocean. Deviations in DBC concentration from the DBC-AOU relationship observed in the central and western Pacific Ocean were quantified. The deviation was linearly correlated with excess ³

SUBMITTER: Yamashita Y 

PROVIDER: S-EPMC9916979 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature