Study of the role of seafloor hydrothermal circulation associate with the distribution and fate of dissolved organic matter in the seawater

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In the ocean water significant amount of dissolved organic matter exist and its net amount has been estimated as much as gaseous carbon in the atmosphere as CO2. However, it has not well understood that the behavior of dissolved organic matter in the oceans. This study aimed to understand the role of the hydrothermal activity with respect to the behavior of ocean DOC. The analytical results of this study suggest that the direct impact to the distribution of ocean DOC by the hydrothermal circulation is minimal, although the process of the hydrothermal circulation works principally as sink of ocean DOC by decomposition and/or adsorption of DOC. On the other hand, hydrothermal plum formed by mixing with seawater and hydrothermal fluid has been considered potential source of ocean DOC, which is expected strong impact to the ocean DOC pool. In the plum water high microbial activity has been detected, so the activity may plausible source of the DOC.