Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 20
Articles | Volume 23, issue 20
https://doi.org/10.5194/bg-23-7505-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-7505-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 20
Research article
 | 
26 Oct 2026
Research article |  | 26 Oct 2026

Biogeochemical controls on the concentrations and stable isotope compositions of sea-ice particulate organic matters in the Southern Ocean

Keigo D. Takahashi, Ryosuke Makabe, Masayoshi Sano, Kazuki Nakata, Noriaki Kimura, Daiki Nomura, Michiyo Yamamoto-Kawai, Ryo Matsuda, Natsumi Nojiro, Masato Ito, Shintaro Takao, Naho Horimoto-Miyazaki, Aiko Tachibana, Norio Kurosawa, Takeshi Tamura, Mizuki Komatsu, Kay I. Ohshima, Kohei Mizobata, Shigeru Aoki, and Masato Moteki

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Short summary
We collected sea ice and identified factors affecting the particulate organic carbon and nitrogen content and stable isotope ratios. The results suggested nutrient and organic matter influenced the isotope compositions in sea ice. Using the hydrography and sea-ice data, we estimated the particulate organic carbon supply from sea ice. This supply was equivalent to 14.7 % of phytoplankton production near ice edge, highlighting the importance of sea-ice derived materials for Antarctic ecosystems.
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