Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C
<p>Particulate organic carbon (POC) serves as the main carrier of the biological pump and determines its transmission efficiency, yet the transformation processes of POC remain incompletely understood. This study reports the vertical distribution of POC, dissolved inorganic carbon (DIC), <s...
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Copernicus Publications
2025-07-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/21/1627/2025/os-21-1627-2025.pdf |
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| author | D. Tian D. Tian X. Li X. Li X. Li X. Li J. Song J. Song J. Song J. Song J. Ma J. Ma H. Yuan H. Yuan H. Yuan H. Yuan L. Duan L. Duan L. Duan L. Duan |
| author_facet | D. Tian D. Tian X. Li X. Li X. Li X. Li J. Song J. Song J. Song J. Song J. Ma J. Ma H. Yuan H. Yuan H. Yuan H. Yuan L. Duan L. Duan L. Duan L. Duan |
| author_sort | D. Tian |
| collection | DOAJ |
| description | <p>Particulate organic carbon (POC) serves as the main carrier of the biological pump and determines its transmission efficiency, yet the transformation processes of POC remain incompletely understood. This study reports the vertical distribution of POC, dissolved inorganic carbon (DIC), <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC, and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-DIC in the tropical Northwestern Pacific Ocean (TNPO). The research identified three distinct biogeochemical layers governing POC transformation: the POC rapid synthesis-degradation layer (RSDL, 0–300 m), the net degradation layer (NDL, 300–1000 m), and the stable layer (SL, 1000–2000 m). From the top to the bottom of the RSDL, <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC values decreased by an average of 2.23 ‰, while the carbon-to-nitrogen (<span class="inline-formula">C:N</span>) ratios increased by an average of <span class="inline-formula">2.3:1</span>, indicating the selective degradation of POC. In the NDL, <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-DIC exhibited a significant negative correlation (<span class="inline-formula"><i>r</i>=0.43</span>, <span class="inline-formula"><i>p</i><0.05</span>), indicating a net transformation of POC to DIC. In the SL, POC proved to be resistant to degradation, with POC exhibiting the highest <span class="inline-formula">C:N</span> (<span class="inline-formula">15:1</span> on average) and the lowest <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC values (average <span class="inline-formula">−</span>27.71 ‰).</p> |
| format | Article |
| id | doaj-art-0e7bcc9af5d046be92ebd40bf21cdc6a |
| institution | Kabale University |
| issn | 1812-0784 1812-0792 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Copernicus Publications |
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| series | Ocean Science |
| spelling | doaj-art-0e7bcc9af5d046be92ebd40bf21cdc6a2025-08-20T03:34:51ZengCopernicus PublicationsOcean Science1812-07841812-07922025-07-01211627163910.5194/os-21-1627-2025Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>CD. Tian0D. Tian1X. Li2X. Li3X. Li4X. Li5J. Song6J. Song7J. Song8J. Song9J. Ma10J. Ma11H. Yuan12H. Yuan13H. Yuan14H. Yuan15L. Duan16L. Duan17L. Duan18L. Duan19CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Institute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, ChinaCAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaInstitute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, ChinaCenter for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266000, ChinaCAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaInstitute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, ChinaCenter for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266000, ChinaCAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaCAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaInstitute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, ChinaCenter for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266000, ChinaCAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaInstitute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, ChinaCenter for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266000, China<p>Particulate organic carbon (POC) serves as the main carrier of the biological pump and determines its transmission efficiency, yet the transformation processes of POC remain incompletely understood. This study reports the vertical distribution of POC, dissolved inorganic carbon (DIC), <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC, and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-DIC in the tropical Northwestern Pacific Ocean (TNPO). The research identified three distinct biogeochemical layers governing POC transformation: the POC rapid synthesis-degradation layer (RSDL, 0–300 m), the net degradation layer (NDL, 300–1000 m), and the stable layer (SL, 1000–2000 m). From the top to the bottom of the RSDL, <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC values decreased by an average of 2.23 ‰, while the carbon-to-nitrogen (<span class="inline-formula">C:N</span>) ratios increased by an average of <span class="inline-formula">2.3:1</span>, indicating the selective degradation of POC. In the NDL, <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-DIC exhibited a significant negative correlation (<span class="inline-formula"><i>r</i>=0.43</span>, <span class="inline-formula"><i>p</i><0.05</span>), indicating a net transformation of POC to DIC. In the SL, POC proved to be resistant to degradation, with POC exhibiting the highest <span class="inline-formula">C:N</span> (<span class="inline-formula">15:1</span> on average) and the lowest <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC values (average <span class="inline-formula">−</span>27.71 ‰).</p>https://os.copernicus.org/articles/21/1627/2025/os-21-1627-2025.pdf |
| spellingShingle | D. Tian D. Tian X. Li X. Li X. Li X. Li J. Song J. Song J. Song J. Song J. Ma J. Ma H. Yuan H. Yuan H. Yuan H. Yuan L. Duan L. Duan L. Duan L. Duan Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C Ocean Science |
| title | Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C |
| title_full | Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C |
| title_fullStr | Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C |
| title_full_unstemmed | Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C |
| title_short | Biogeochemical layering and transformation of particulate organic carbon in the Tropical Northwestern Pacific Ocean inferred from <i>δ</i><sup>13</sup>C |
| title_sort | biogeochemical layering and transformation of particulate organic carbon in the tropical northwestern pacific ocean inferred from i δ i sup 13 sup c |
| url | https://os.copernicus.org/articles/21/1627/2025/os-21-1627-2025.pdf |
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