Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan

Umezawa, Sachi; Tozawa, Manami; Nosaka, Yuichi; Nomura, Daiki; Onishi, Hiroji; Abe, Hiroto; Takatsu, Tetsuya; Ooki, Atsushi

doi:https://doi.org/10.5194/bg-20-421-2023

Articles | Volume 20, issue 2

https://doi.org/10.5194/bg-20-421-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-20-421-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 2

Research article

|

27 Jan 2023

Research article |

| 27 Jan 2023

Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan

Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki

Supplement

https://doi.org/10.5194/bg-20-421-2023-supplement

Data sets

Funka Bay observation bottle data (Nutrients, chlorophyll-a, and oxygen) from February to April of 2019 A. Ooki https://doi.org/10.5281/zenodo.7537961

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Short summary

We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.