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<p>Coccolith and coccolith-CaCO<sub>3</sub> fluxes were calculated from samples obtained by time-series sediment traps deployed at 1,000&#xa0;m depth in the Ulleung Basin (East Sea, Korea) between November 2010 and January 2012. The coccolith flux ranged from 0.12 to 2.90 × 10<sup>6</sup> coccoliths m<sup>−2</sup> d<sup>−1</sup>, and peaked in November 2010. The assemblage was dominated by three coccolithophore species (<i>Gephyrocapsa huxleyi</i>,<i> Coccolithus pelagicus</i>, and <i>G. oceanica</i>) which together represented 86% of the coccolith flux. <i>G. huxleyi</i> exhibited pronounced seasonal variability, peaking in January 2011, while <i>C. pelagicus</i> was predominant from April to July. Coccolith-CaCO<sub>3</sub> flux varied seasonally, ranging from 0.2 to 21.0&#xa0;mg&#xa0;m<sup>−2</sup> d<sup>−1</sup>, with <i>C. pelagicus</i> contributing the largest proportion (66.7%) due to its high calcite content. This study represents the first sediment-trap-based documentation of coccolithophore composition and seasonality in the East Sea. Community shifts and flux dynamics appear to be influenced by seasonal changes in regional oceanographic conditions, including the current systems entering the Ulleung Basin. Our results emphasize the significant role of coccolithophores in regional CaCO<sub>3</sub> export and highlight the potential sensitivity of biological carbon sequestration to future ocean acidification in marginal seas.</p>

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First Assessment of Coccolithophore-Driven Carbonate Flux in the Ulleung Basin, East Sea (Sea of Japan)

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Sung Min An,
  • Dong Han Choi,
  • Young-Il Kim,
  • Young Suk Chang,
  • Jae Hoon Noh

摘要

Coccolith and coccolith-CaCO3 fluxes were calculated from samples obtained by time-series sediment traps deployed at 1,000 m depth in the Ulleung Basin (East Sea, Korea) between November 2010 and January 2012. The coccolith flux ranged from 0.12 to 2.90 × 106 coccoliths m−2 d−1, and peaked in November 2010. The assemblage was dominated by three coccolithophore species (Gephyrocapsa huxleyi, Coccolithus pelagicus, and G. oceanica) which together represented 86% of the coccolith flux. G. huxleyi exhibited pronounced seasonal variability, peaking in January 2011, while C. pelagicus was predominant from April to July. Coccolith-CaCO3 flux varied seasonally, ranging from 0.2 to 21.0 mg m−2 d−1, with C. pelagicus contributing the largest proportion (66.7%) due to its high calcite content. This study represents the first sediment-trap-based documentation of coccolithophore composition and seasonality in the East Sea. Community shifts and flux dynamics appear to be influenced by seasonal changes in regional oceanographic conditions, including the current systems entering the Ulleung Basin. Our results emphasize the significant role of coccolithophores in regional CaCO3 export and highlight the potential sensitivity of biological carbon sequestration to future ocean acidification in marginal seas.