Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific

Feng Lin; Cai Lin; Xiuwu Sun; Hui Lin; Li Lin; Fangfang Deng; Kaiwen Tan; Peng Lin

doi:10.1007/s13131-024-2413-9

Volume 43 Issue 10

Oct. 2024

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Feng Lin, Cai Lin, Xiuwu Sun, Hui Lin, Li Lin, Fangfang Deng, Kaiwen Tan, Peng Lin. Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific[J]. Acta Oceanologica Sinica, 2024, 43(10): 100-106. doi: 10.1007/s13131-024-2413-9

Citation:

Feng Lin, Cai Lin, Xiuwu Sun, Hui Lin, Li Lin, Fangfang Deng, Kaiwen Tan, Peng Lin. Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific[J]. Acta Oceanologica Sinica, 2024, 43(10): 100-106. doi: 10.1007/s13131-024-2413-9

Citation:

Feng Lin, Cai Lin, Xiuwu Sun, Hui Lin, Li Lin, Fangfang Deng, Kaiwen Tan, Peng Lin. Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific[J]. Acta Oceanologica Sinica, 2024, 43(10): 100-106. doi: 10.1007/s13131-024-2413-9

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Bioturbation coefficients and organic carbon degradation rates of deep-sea sediments in the central-eastern tropical Pacific

doi: 10.1007/s13131-024-2413-9

1.
Laboratory of Marine Ecological Environmental Early Warning and Monitoring, Third Institute of Oceanography, Xiamen 361005, China
2.
Savannah River Ecology Laboratory, University of Georgia, Aiken 29802, USA

Funds: The Scientific Research Foundation of Third Institute of Oceanography, Ministry of Natural Resources under contract No. 2020012; the Natural Science Foundation of Xiamen, China under contract No. 3502Z20227246; the Guiding Project of the Science and Technology Plan of Fujian Province under contract No. 2020Y0081.

More Information

Corresponding author: E-mail: lincai@tio.org.cn
Received Date: 2024-01-22
Accepted Date: 2024-05-23

Available Online: 2024-01-13

Publish Date: 2024-10-25

Abstract

Abstract

The biogeochemical processes of marine sediments are influenced by bioturbation and organic carbon decomposition, which is crucial for understanding global element cycles and climate change. Two sediment cores were acquired in 2017 from abyssal basins in the central-eastern tropical Pacific to determine the bioturbation and organic carbon degradation processes. The radioactivity concentrations of ²¹⁰Pb and ²²⁶Ra in the sediment cores were measured, indicating the presence of significant excess ²¹⁰Pb (²¹⁰Pb_ex) signals in the sediment cores. Besides, a manganese nodule was discovered in one core, which had a substantial influence on the distribution of ²¹⁰Pb_ex. With the exception of this anomalous finding, the bioturbation coefficients in the remaining core were estimated to be 10.6 cm²/a using a steady-state diffusion model, greater than most of the deep-sea sediments from the equatorial eastern Pacific. By using a bio-diffusion model, we further calculated the degradation rates of organic carbon (8.02 ka⁻¹), which is also higher than other areas of the Pacific. Our findings displayed the presence of a biologically active benthic ecosystem in the central-eastern tropical Pacific.
- ²¹⁰Pb,
- ²²⁶Ra,
- bioturbation,
- tropical Pacific,
- organic carbon,
- degradation rate

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References(43)

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