Biogenic barium, carbon and nitrogen isotopes features in sediments of the northern South China Sea and their correlation with primary productivity of surface ocean

Ni Jianyu; Zhao Jun; Jiang Qiaowen; Yao Xuying

doi:10.3969/j.issn.0253-4193.2019.02.004

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Ni Jianyu, Zhao Jun, Jiang Qiaowen, Yao Xuying. Biogenic barium, carbon and nitrogen isotopes features in sediments of the northern South China Sea and their correlation with primary productivity of surface ocean[J]. Haiyang Xuebao, 2019, 41(2): 41-51. doi: 10.3969/j.issn.0253-4193.2019.02.004

Citation:

Ni Jianyu, Zhao Jun, Jiang Qiaowen, Yao Xuying. Biogenic barium, carbon and nitrogen isotopes features in sediments of the northern South China Sea and their correlation with primary productivity of surface ocean[J]. Haiyang Xuebao, 2019, 41(2): 41-51. doi: 10.3969/j.issn.0253-4193.2019.02.004

Citation:

Ni Jianyu, Zhao Jun, Jiang Qiaowen, Yao Xuying. Biogenic barium, carbon and nitrogen isotopes features in sediments of the northern South China Sea and their correlation with primary productivity of surface ocean[J]. Haiyang Xuebao, 2019, 41(2): 41-51. doi: 10.3969/j.issn.0253-4193.2019.02.004

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Biogenic barium, carbon and nitrogen isotopes features in sediments of the northern South China Sea and their correlation with primary productivity of surface ocean

doi: 10.3969/j.issn.0253-4193.2019.02.004

1.
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
School of Marine and Geosciences, Ocean University of China, Qingdao 266100, China

Received Date: 2018-03-28
Rev Recd Date: 2018-06-29

Abstract

Abstract

In this paper, we analyze different forms of barium, biogenic silica, the organic carbon (OC), total nitrogen concentrations and their stable isotopic compositions (δ¹³C and δ¹⁵N) in two short sediment cores sampled from the northern South China Sea (SCS). The results show that the detrital and biogenic barium are the main forms of barium in sediments. Based on the sequential extraction leaching, the biogenic barium content in sediments is between 10.3 μg/g and 385.2 μg/g with an average of 177.0 μg/g. Estimated the past productivity using the biogenic barium is between 12.3 mg/(d·m²) and 146.7 mg/(d·m²) with an average of 78.9 mg/(d·m²), and is comparable with the modern values near D06 station. The stratigraphic profiles of OC concentration, OC/TN ratios, δ¹³C and δ¹⁵N for the past about 400 years indicate that these two cores display distinctive histories. The δ¹³C values of sedimentary organic matter changed between -22.98‰ and -20.73‰. The relatively narrow δ¹³C range of sedimentary organic carbon with a mean value close to -21.46‰ indicates that the sedimentary organic matter is derived from marine phytoplankton mainly. Based on a two-end member mixing model, the estimated terrestrial organic matter is up to 41.3% at site S0612 and 11% at site D06 respectively. The δ¹⁵N values of sediments range from 5.92‰ to 6.29‰ with an average of (6.08±0.12)‰ for D06, and 3.96‰ to 4.85‰ with an average of (4.32±0.26)‰ for S0612 respectively. The low δ¹⁵N values may reflect that nitrogen fixation was more important for the new nitrogen supply and the source of ntritate from north Pacific intermediate water, and was not affected by nitrate utilization.
- biogenic barium,
- organic matter,
- nitrogen and carbon isotopes,
- primary productivity,
- northern South China Sea

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