Abstract
Dissolved organic matter (DOM) can be partially converted into particulate organic matter via aggregation. Although surface coagulation by bubbles is known to be an aggregation process, a few studies have tested its efficacy for aggregating natural DOM. In the research described here, we tested surface coagulation by bubbles using natural seawater collected from different locations, and achieved organic matter aggregation (OCagg) at the concentrations up to 0.619 μM. In addition, the test using seawater enriched with nutrient showed that OCagg was 0.559 μM. We also evaluated aggregation in mesocosm through 40 days. The OCagg concentrations increased after nutrient depletion (0.858–1.34 μM), and the OCagg/DOC ratio reached its maximum on day 18 (1.24 ± 0.19%).
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Acknowledgements
The setting of mesocosm experiment was also helped by S. Kurosawa and K. Takonai. The statistical analysis was supported by Dr. S. Agostini. We also grateful for members in Shimoda Marine Research Center.
Funding
This study was funded by JSPS KAKENHI (16H06382 and 17K20040) and Japanese Association for Marine Biology (JAMBIO).
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Wada, S., Omori, Y., Yamashita, S. et al. Aggregation of marine organic matter by bubbling. J Oceanogr 76, 317–326 (2020). https://doi.org/10.1007/s10872-019-00538-1
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DOI: https://doi.org/10.1007/s10872-019-00538-1