Articles | Volume 20, issue 20
https://doi.org/10.5194/bg-20-4323-2023
https://doi.org/10.5194/bg-20-4323-2023
Research article
 | 
24 Oct 2023
Research article |  | 24 Oct 2023

Contribution of the open ocean to the nutrient and phytoplankton inventory in a semi-enclosed coastal sea

Qian Leng, Xinyu Guo, Junying Zhu, and Akihiko Morimoto

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Cited articles

Abo, K. and Yamamoto, T.: Oligotrophication and its measures in the Seto Inland Sea, Japan, Bull. Jpn. Fish. Res. Educ. Agency, 49, 21–26, 2019. 
Anderson, D. M., Burkholder, J. M., Cochlan, W. P., Glibert, P. M., Gobler, C. J., Heil, C. A., Kudela, R. M., Parsons, M. L., Rensel, J. E. J., Townsend, D. W., Trainer, V. L., and Vargo, G. A.: Harmful algal blooms and eutrophication: Examining linkages from selected coastal regions of the United States, Harmful Algae, 8, 39–53, https://doi.org/10.1016/j.hal.2008.08.017, 2008. 
Aoki, K., Shimizu, Y., Yamamoto, T., Yokouchi, K., Kishi, K., Akada, H., and Kurogi, H.: Estimation of inward nutrient flux from offshore into semi-enclosed sea (Tokyo Bay, Japan) based on in-situ data, Estuar. Coast. Shelf Sci., 274, 107930, https://doi.org/10.1016/j.ecss.2022.107930, 2022. 
Ariathurai, R. and Krone, R. B.: Mathematical modelling of sediment transport in estuaries, in: Estuarine Processes, Elsevier, 98–106, https://doi.org/10.1016/B978-0-12-751802-2.50015-1, 1977. 
Bauer, J. E., Cai, W.-J., Raymond, P. A., Bianchi, T. S., Hopkinson, C. S., and Regnier, P. A. G.: The changing carbon cycle of the coastal ocean, Nature, 504, 61–70, https://doi.org/10.1038/nature12857, 2013. 
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Short summary
Using a numerical model, we revealed that a large proportion of nutrients in a semi-enclosed sea (Seto Inland Sea, Japan) comes from the Pacific Ocean and supports about half of the phytoplankton growth in the sea. Such results imply that the human-made management of nutrient load from land needs to consider the presence of oceanic nutrients, which act as a background concentration and are not controlled by human activities.
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