Roles of sediment supply, geochemical composition and monsoon on organic matter burial along the longitudinal mud belt in the East China Sea in modern times

Wang, Huawei; Kandasamy, Selvaraj; Liu, Qianqian; Lin, Baozhi; Lou, Jie-Chung; Veeran, Yoganandan; Lei, Huaiyan; Liu, Zhifei; Chen, Chen‐Tung Arthur

doi:10.1016/j.gca.2021.04.025

Cited by 19 publications

(8 citation statements)

References 112 publications

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“…This finding indicates that there was a more substantial deposition of terrestrial OM in HZB that can be attributed to the significant contribution of suspended matter from the Yangtze River (Zhang et al, 2021). This significant mixing effect of marine and riverine OM was also observed at the Yangtze River estuary and its adjacent shelf as well as the Pearl River estuary and its adjacent shelf (see Figure 3B; Li et al, 2012;Wang et al, 2021;Sun et al, 2022). However, the terrigenous OM in HZB is deeper than that of the Pearl River estuary, as measured using organic carbon isotope analysis (shown in Figure 3B).…”

Section: Sensitivity Of Organic Matter To Environmental Changesmentioning

confidence: 68%

“…The continental margin is the active terrestrial-ocean interface that serves as a primary location for the biochemical and sedimentary cycling of organic carbon (OC), nitrogen (N), and sulfur (S) (Berner, 1982;Jørgensen and Kasten, 2006;Hu et al, 2011;DeLaune and White, 2012;Hu et al, 2014;Jørgensen et al, 2019;Chen et al, 2021). Dynamic physicochemical reactions along continental margins create complex OC-N-S cycles that can be affected by local climate; however, the mechanistic link of climate change to the OC-N-S cycles is not well understood (Mcleod et al, 2011;Liu Q. et al, 2018;Liu X. T., et al, 2018;Sun et al, 2020;Liu X. T., et al, 2021;Wang et al, 2021;Zhao et al, 2021;Liu et al, 2023). The sedimentary process on the continental margin is primarily controlled by the change in sea level, with different sedimentary sequences forming at different sea levels.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Gao,

Piotrowski,

et al. 2024

Front. Mar. Sci.

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The correlation between the amount of organic carbon (OC) and sulfur (S) in sediments has been widely used as a paleosalinity indicator to distinguish between marine and freshwater environments. However, whether the ratio of total OC to total S (TOC/TS) can be used to identify unsteady or dynamic marine environments across sedimentary strata is still contended. An HZW1907 sediment core of 80 m in length was successfully collected in the middle of Hangzhou Bay (HZB), serving as one of the few boreholes that are crucial for the study of geologic and geo-environment changes in the coastal regions of eastern China since the Last Glacial Maximum (LGM). Total OC (TOC), stable carbon isotope, and TS of 82 subsamples from the HZW1907 core were analyzed to reconstruct the history of the shallow water biological pump and sulfur preservation record in the bay since the Late Pleistocene. Our results indicate that the samples had low concentrations of TOC (0.21%) and total nitrogen (TN) (0.02%), high mass ratio of TOC/TN (10.8), low δ13C (−24.9‰), low TS content (0.06%), and a high ratio of TOC/TS (9.1) from 33.6 ka BP to 12.3 ka BP, implying that freshwater organic matter (OM), algae, and C3 plant fragments were the main sources of OM in a relatively cold environment. The abundances of TOC, TN, and TS increased to 0.56%, 0.07%, and 0.4%, respectively, while δ13C (−23.9‰) increased and TOC/TS (2.7) decreased in the Holocene sediments, suggesting that seawater began to influence the composition of the sediments of HZB. Climate warming, which is likely to have impacted the results, was experienced from 12.3 ka BP. An OC isotope mixing model indicated that since the Mid-late Holocene, more than 70% of riverine OM accounted for the total OM. The TOC/TS ratio was identified as an effective indicator of seawater intrusion, with C/S ratios of 1–6 being considered to indicate a “sea–land transitional zone” sedimentary environment, a C/S >6 indicating freshwater, and a C/S<1 indicating normal marine facies. These findings provide crucial evidence for using TOC/TS to distinguish freshwater from marine environments and enhance our understanding of past climate changes. Therefore, these geochemical indicators can be used in conjunction with other sedimentary records to obtain accurate results about sedimentary evolution.

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Section: Sensitivity Of Organic Matter To Environmental Changesmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Gao,

Piotrowski,

et al. 2024

Front. Mar. Sci.

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“…It is noted that the grain size of core G02 shows a clear fining trend through the Late Holocene (Figure 3A), suggesting that the transport capacity of overland flow decreased and that the intensity of the monsoon weakened (Wang et al, 2021). Fine-grained sediments play an influential role in the transport and burial of Frontiers in Earth Science frontiersin.org OM (Goñi et al, 2008;Wang et al, 2021). Accordingly, we propose that fine-grained sediments also contributed to the increase in terrestrial OM content in core G02 during the Late Holocene.…”

Section: Human Disturbance Over the Past 1400 Yearsmentioning

confidence: 99%

“…Sedimentary organic matter (SOM) in marginal seas comprises a complex mixture of organic compounds originating from two main sources (Hu et al, 2014;Ge et al, 2019): terrestrial organic matter (OM) transported by river runoff, and marine OM produced by marine primary producers in the euphotic zone (EZ) (Huang et al, 2021). The nature of OM that becomes buried in a marginal sea is controlled by a combination of terrestrial sediment supply, aquatic productivity, and coastal hydrodynamics (Wang et al, 2021). Determining the sources, burial process, and ultimate fate of OM in marginal sea environments is essential for understanding regional biogeochemical processes and the global carbon cycle.…”

Section: Introductionmentioning

confidence: 99%

High-resolution record of temporal change in organic matter burial over the past ∼8,600 years on the northwestern continental slope of the South China Sea

Tong,

Chen,

Zhang

et al. 2023

Front. Earth Sci.

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Sedimentary organic matter (SOM) on continental slopes in marine regions can sensitively record climatic and environmental changes. In this study, total organic carbon content (TOC), total nitrogen content (TN), and their stable isotope compositions (δ13C and δ15N) for sediments of core G02 were investigated (at ∼24.2-year resolution) to reveal the temporal variations in organic matter sources and the main controls on the sources and distribution of buried organic matter on the northwestern continental slope of the South China Sea over the last ∼8600 years. Results of a δ13C binary mixing model reveal that ∼82.3 ± 3% of SOM is derived from marine autochthonous sources. We suggest that the carbon and nitrogen contents and compositions of SOM are governed by distinct factors. The more positive δ15N values before the Pulleniatina Minimum Event occurrence are ascribed to stronger subsurface water intrusion by the Kuroshio Current, which led to enhanced subsurface denitrification and in turn counteracted the effect of mixing with surface water caused by the East Asian winter monsoon. Sedimentary δ13C values show a fluctuant decrease during ca. 8.6–3.0 cal kyr BP and a conspicuous increase during ca. 3.0–1.4 cal kyr BP. These changes are attributed to the decrease of marine productivity induced by the continuous weakening East Asian monsoon effect and the decrease of terrigenous organic carbon input induced by the weakened Indian summer monsoon precipitation, respectively. Since ca. 1.4 cal kyr BP, human activities have become the dominant factor in controlling the production and distribution of organic carbon. The results provide an important basis for understanding of source-sink processes of organic matter and the factors influencing these processes on continental slopes in low-latitude marginal seas.

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“…Considering that the sediments of the South Yellow Sea are mainly influenced by the input of the Yellow River, the terrestrial end member d 13 C TOC was obtained from the d 13 C values of the Yellow River particulates, which is -23.9 ± 0.6‰ (Yu et al, 2021). Similarly, -25.6 ± 0.7‰ was chosen for the terrestrial end member in the East China Sea obtained from the Yangtze River particulates (Wang et al, 2021). To be consistent with previous studies, the d 13 C value of -20 ± 1.0‰ and -20.6 ± 1.2‰ were used for the marine endmember in the Yellow Sea and East China Sea, respectively (Xing et al, 2014;Yoon et al, 2016;Wang et al, 2021;Yu et al, 2021).…”

Section: Csar (T Hamentioning

confidence: 99%

Carbon stocks in the mud areas of the Chinese marginal seas

Ma,

Xiao,

Ding

et al. 2023

Front. Mar. Sci.

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Continental marginal seas are key systems in the global carbon cycle. Carbon stocks represent the ability to store carbon, thus quantifying the carbon stocks in marine sediments would help to better understand their importance in the carbon cycle. In this study, 17 sediment cores in the mud areas of the South Yellow Sea and the East China Sea were measured for total organic carbon (TOC) and its stable isotope (δ13C), and dry bulk density; and from which the carbon stocks and carbon stock accumulation rate as well as marine/terrestrial carbon stocks/carbon stock accumulation rate were calculated. The carbon stocks in the mud area of the South Yellow Sea showed a decreasing trend during 1855 to 1950 caused by the relocation of the Yellow River Estuary in 1855, but increased after 1950s due to increased sediment input via the enhancement of South Shandong Coastal Current. In the Min-Zhe belt of the East China Sea, carbon stocks showed an overall high marine proportion due to the phytoplankton bloom induced by high nutrient level, but the decreased carbon stocks in recent decades were mainly caused by the construction of reservoirs in the Yangtze River that reduced sediment transports. The average carbon stocks in 1 m sediments from the South Yellow Sea (45.2 t ha-1) and Min-Zhe belt (52.8 t ha-1) were low compared to that of global marine sediments (66.6 t ha-1), while the carbon stock accumulation rate showed much higher values (0.1 t ha-1 yr-1 in South Yellow Sea and 0.31 t ha-1 yr-1 in the Min-Zhe belt) because of higher sedimentation rates. Although carbon stocks of Chinese marginal seas were also lower than that of the tidal flats (70.7 t ha-1) and wetland (123.6 t ha-1) in China, their much larger area could store 0.75 Pg C in marine sediments. Our temporal records suggest that anthropogenic activities have reduced carbon stocks in the marginal seas since 1950, causing carbon to re-enter the atmosphere to impact climate changes.

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Roles of sediment supply, geochemical composition and monsoon on organic matter burial along the longitudinal mud belt in the East China Sea in modern times

Cited by 19 publications

References 112 publications

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

High-resolution record of temporal change in organic matter burial over the past ∼8,600 years on the northwestern continental slope of the South China Sea

Carbon stocks in the mud areas of the Chinese marginal seas

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