| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
CHEN Fen, LI Gang, ZHU Xiaowei, YAN Wen. Spatial distribution of organic matter in surface sediments from the Nansha sea area of the South China Sea and its implications for marine productivity and monsoon[J]. Marine Geology & Quaternary Geology, 2023, 43(2): 45-54. doi: 10.16562/j.cnki.0256-1492.2022072601
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Spatial distribution of organic matter in surface sediments from the Nansha sea area of the South China Sea and its implications for marine productivity and monsoon
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Abstract
The knowledge of modern hydrologic process provides important clues for marine palaeoenvironmental and palaeoclimatic evolution. Twenty-three surface sediment samples collected throughout the Nansha sea area of the South China Sea (SCS) were analyzed for sedimentary bulk parameters, including total organic carbon (TOC), total nitrogen (TN) and their isotopes (δ13CTOC and δ15N), in order to understand the controlling factors on the spatiotemporal variations of sedimentary organic matter (OM). Results show that the TOC/TN (5.5～7.9 in range and 6.5±0.6 on average) and δ13CTOC (–21.9‰ ～ –18.7‰ in range and –21.0‰±0.7‰ on average) reflect the dominance of marine OM input to surface sediments in the Nansha sea area. Correlation analyses of δ13CTOC vs TOC and vs TOC/TN indicate that sedimentary TOC was not significantly affected by early diagenesis, thereby TOC can be used as an effective tracer for surface productivity. The values of TOC (0.32%～0.97% in range and 0.67%±0.17% on average) show a descending trend from the western to eastern parts of the Nansha sea area, indicating clearly the importance of southwesterly summer monsoon in delivering rich nutrients from the productive Vietnam upwelling and Mekong delta. Moreover, strong correlation between TOC and TN (R2=0.95) and clear spatial distribution of δ15N manifested the ability of bulk δ15N to reflect upper water δ15N signal due to the minimal influence of riverine terrigenous inorganic N, thereby indicating the relevant nitrogen cycle process.
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References
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CHEN Fen, LI Gang, ZHU Xiaowei, YAN Wen. Spatial distribution of organic matter in surface sediments from the Nansha sea area of the South China Sea and its implications for marine productivity and monsoon[J]. Marine Geology & Quaternary Geology, 2023, 43(2): 45-54. doi: 10.16562/j.cnki.0256-1492.2022072601
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Figure 1.
Surface sediment sites and seasonal surface circulation in the Nansha sea area of the South China Sea[19]
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Figure 2.
Surface seawater temperature (a) and salinity (b) in the Nansha sea area of the South China Sea in summer
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Figure 3.
Correlations of TOC vs TN (a), δ13CTOC vs TOC/TN (b), and δ13CTOC vs TOC (c)
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Figure 4.
Distribution of TOC and δ15N in surface sediments in the Nansha sea area
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Figure 5.
Correlation between TOC and water depth