Seasonal distribution patterns of 7Be and 210Pb in surface sediments in the Changjiang Estuary, China and their implication

Du, Jinzhou; Huang, Dekun; Wang, Jinlong; Zhang, Jing

doi:10.1016/j.jmarsys.2015.05.001

Cited by 14 publications

(18 citation statements)

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“…In the use of radionuclides as tracers for the assessment of sediment transport in estuary, coast, and shelf region, their source terms should be first assessed. In our earlier study we reported that the main sources of 7 Be and 210 Pb to the water and sediments in the ECS are atmospheric fallout, riverine input, and boundary scavenging (Du et al, ). The in situ production of 210 Pb from dissolved 226 Ra is negligible (Du et al, ; Huang et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…In our earlier study we reported that the main sources of 7 Be and 210 Pb to the water and sediments in the ECS are atmospheric fallout, riverine input, and boundary scavenging (Du et al, ). The in situ production of 210 Pb from dissolved 226 Ra is negligible (Du et al, ; Huang et al, ). The sinks of 7 Be and 210 Pb in the ECS are removal onto suspended particulate matter and their subsequent sediment deposition and transport to areas adjoining the study area.…”

Section: Resultsmentioning

confidence: 99%

“…The 210 Pb atmospheric depositional flux values in May and August were plotted in Figure . The riverine input of 7 Be and 210 Pb to the ECS is mainly from Changjiang input, and the contributions from other rivers are negligible as they only discharge 10% of freshwater to the ECS (Du et al, , ). No data are reported for the Changjiang input of 7 Be and 210 Pb during 2011, and thus, we have used the data from 2010.…”

Section: Resultsmentioning

confidence: 99%

“…No data are reported for the Changjiang input of 7 Be and 210 Pb during 2011, and thus, we have used the data from 2010. The mean activity of total 7 Be and 210 Pb (particulate form + dissolved form) in Xuliujing, a gauge station in Changjiang mouth (31.8°N, 121.0°E), were reported to be 3.4 ± 1.2 and 6.8 ± 1.3 Bq/m 3 during March and May 2010, respectively, and those during June and August were reported to be 1.5 ± 0.8 and 5.8 ± 1.6 Bq/m 3 , respectively (Du et al, ). Using the water discharge of Changjiang during May (17,000 m/s) and August (31,000 m/s) (Wang et al, ), we estimated the riverine input flux from Changjiang River and is given in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Hence, study of sediment dynamics in this environment has received wide attention (Hoitink et al, ). Particle‐reactive radionuclides that have short half‐lives (e.g., 7 Be, 210 Pb, and 234 Th) have been widely utilized to trace the transport of sediments from rivers to oceans (e.g., Allison et al, ; Baskaran et al, ; Baskaran & Santschi, ; Du et al, ). These radionuclides adsorb onto particulate matter and thereby can serve as particle tracers, with distribution coefficient (K d ) values of 10 4 –10 6 ml/g in estuarine and coastal waters (e.g., Baskaran & Santschi, ; Feng et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

et al. 2018

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Both magnetic properties and radionuclides are widely used to trace sediment transport in aquatic environments; however, these methods have not been used in combination. In this study, the East China Sea (ECS), a typical river‐dominated margin, was chosen to demonstrate the advantages of combining these two methods to track sediment movements on a seasonal to annual timescale. The ratios between saturation isothermal remnant magnetization and anhysteretic remnant magnetization (χARM/SIRM) and 7Be/210Pbex activity ratios as well as mass balance of 7Be provide information on the seasonal transport of sediment from the Changjiang Estuary to the neighboring shelf. Both 210Pb budget and SIRM distribution in the inner shelf of the ECS show that a small fraction (at most 14% of annual Changjiang sediment discharge) of particles could be transported offshore. Most of 7Be activities in inner shelf sediments of the ECS were below detection limit due to relatively lower residence times and dilution by the older sediment. The observation that radionuclide activities exhibit a better correlation with χARM/SIRM ratios than with grain size suggests that iron oxides are the primary carriers of 7Be, 210Pb, and 234Th. The absorption of radionuclides onto magnetic minerals further reinforces the reliability of this combined approach in tracing sediment transport. Our study indicates that radionuclides, with different half‐lives, can be utilized for quantifying sediment dynamics, whereas magnetic properties can yield more detailed information on sediment transport directions. The combined analysis of magnetic parameters and radionuclides offers a better understanding of sediment transport in river‐dominated areas.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

et al. 2018

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Variations in the transport, distribution, and budget of ²¹⁰Pb in sediment over the estuarine and inner shelf areas of the East China Sea due to Changjiang catchment changes

et al. 2017

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To investigate the impact of changes in the Changjiang catchment on the estuarine coast‐shelf sedimentary system, variations in the transport, distribution, and budget of 210Pb in the sediment of the Changjiang subaqueous delta (CSD) and the Zhejiang‐Fujian coastal mud belt (ZFCMB) system were analyzed before and after the impounding of the Three Gorges Dam (TGD). The results indicate that the 210Pbex activity in the surficial sediments of the CSD‐ZFCMB decreased significantly after 2003 and that the surficial and vertical distribution of the 210Pbex activity in the CSD changed substantially due to intensified sediment redistribution. The 210Pb contribution of the Changjiang catchment to the CSD‐ZFCMB is not negligible. Due to the trapping effect of the TGD, 76 ± 49% of the 210Pb supply from the Changjiang upstream areas was retained in the TGD, resulting in the 210Pb flux into the sea decreased substantially. Furthermore, our findings demonstrate that the cross‐shelf plume provides a major conduit for the transport of 210Pb over the East China Sea. The variation in the 210Pb budget in the sediment of the CSD‐ZFCMB also indicated that the influence of Changjiang catchment changes on the 210Pbex and supported 210Pb activities will become more significant in the future. In addition, the rate of 210Pb burial in the sediments of the ZFCMB decreased, whereas the retention index of 210Pb and the amount of 210Pb retained in the CSD increased significantly, suggesting that after 2003, the material transfer function of the CSD weakened.

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Seasonal variability of 7Be in suspended sediments from the Copper River, Alaska: implications for quantifying recent flood deposits in coastal environments

Williams¹,

Kuehl²,

Clyne

et al. 2018

Geo-Mar Lett

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Seasonal distribution patterns of 7Be and 210Pb in surface sediments in the Changjiang Estuary, China and their implication

Cited by 14 publications

References 41 publications

Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

Variations in the transport, distribution, and budget of ²¹⁰Pb in sediment over the estuarine and inner shelf areas of the East China Sea due to Changjiang catchment changes

Seasonal variability of 7Be in suspended sediments from the Copper River, Alaska: implications for quantifying recent flood deposits in coastal environments

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Seasonal distribution patterns of 7Be and 210Pb in surface sediments in the Changjiang Estuary, China and their implication

Cited by 14 publications

References 41 publications

Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

Fingerprinting Sediment Transport in River‐Dominated Margins Using Combined Mineral Magnetic and Radionuclide Methods

Variations in the transport, distribution, and budget of 210Pb in sediment over the estuarine and inner shelf areas of the East China Sea due to Changjiang catchment changes

Seasonal variability of 7Be in suspended sediments from the Copper River, Alaska: implications for quantifying recent flood deposits in coastal environments

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Variations in the transport, distribution, and budget of ²¹⁰Pb in sediment over the estuarine and inner shelf areas of the East China Sea due to Changjiang catchment changes