Sedimentation and lateral transport of 210Pb over the East China Sea Shelf

Fang, Ziming; Yang, Weifeng; Zhang, Xinxing; Chen, Min; Fan, Di; Ma, Qiang; Zhang, Run; Zheng, Minghui; Qiu, Yusheng

doi:10.1007/s10967-013-2561-4

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…The sediment environments of the ECS are highly heterogeneous ( Dang et al, 2008 ; Fang et al, 2013 ); this characteristic has a strong influence on the spatial heterogeneity of the sediment microbial communities in the ECS, as observed in previous studies ( Dang et al, 2008 ; Feng et al, 2009 ; Chen et al, 2014 ; Ye et al, 2016 ). Based on the sediment grain size combined with the overlying water masses, the ECS can be divided into three domains: the inner shelf mud area, the outer shelf sand area, and the slope plus Okinawa Trough mud area ( Liu et al, 2006 ; Xu et al, 2016 ).…”

Section: Discussionsupporting

confidence: 56%

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

et al. 2017

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Sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB) have been studied extensively in marine sediments because of their vital roles in both sulfur and carbon cycles, but the available information regarding the highly diverse SRB and SOB communities is not comprehensive. High-throughput sequencing of functional gene amplicons provides tremendous insight into the structure and functional potential of complex microbial communities. Here, we explored the community structure, diversity, and abundance of SRB and SOB simultaneously through 16S rRNA, dsrB and soxB gene high-throughput sequencing and quantitative PCR analyses of core samples from the East China Sea. Overall, high-throughput sequencing of the dsrB and soxB genes achieved almost complete coverage (>99%) and revealed the high diversity, richness, and operational taxonomic unit (OTU) numbers of the SRB and SOB communities, which suggest the existence of an active sulfur cycle in the study area. Further analysis demonstrated that rare species make vital contributions to the high richness, diversity, and OTU numbers obtained. Depth-based distributions of the dsrB, soxB, and 16S rRNA gene abundances indicated that the SRB abundance might be more sensitive to the sedimentary dynamic environment than those of total bacteria and SOB. In addition, the results of unweighted pair group method with arithmetic mean (UPGMA) clustering analysis and redundancy analysis revealed that environmental parameters, such as depth and dissolved inorganic nitrogen concentrations, and the sedimentary dynamic environment, which differed between the two sampling stations, can significantly influence the community structures of total bacteria, SRB, and SOB. This study provided further comprehensive information regarding the characteristics of SRB and SOB communities.

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Section: Discussionsupporting

confidence: 56%

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

et al. 2017

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“…According to Stokes' Law, for particles with a median size of5.5μm (as forFFJ103), the corresponding average deposition rate is 0.65 m/day, and therefore the residence time of the particles in the water column at FFJ103 is about 100 days. This is consistent with results obtained from 210 Pb and 210 Po (Nozaki et al, 1991;Fang et al, 2013). We estimated that POP losses from the water column at FFJ103 were 46% HCHs, 40% DDTs, 36% PCBs, 17% 8PBDEs and 17% BDE-209, respectively (Figure 5).…”

Section: Spatial Variation Between Pops and Bc/toc Inventories And Th...supporting

confidence: 91%

Deposition records of persistent organic pollutants and black carbon in dated sediment cores from China marginal seas: Implications for terrestrial sources and transport processes

Lin

Han

et al. 2022

Marine Pollution Bulletin

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“…In contrast, scavenging tends to enhance inventories only for 210 Pb ex in marine systems because 210 Pb ex binds rapidly and almost irreversibly to suspended particles in saline water, which then settle to the seafloor (cf. Fang et al 2013), whereas dissolved 137 Cs does not (Oguri et al 2012).…”

Section: Indications Of Riverine Inputs Focusing and Boundary Scavementioning

confidence: 94%

Sources and accumulation of sediment and particulate organic carbon in a subarctic fjard estuary:²¹⁰Pb,¹³⁷Cs, and δ¹³C records from Lake Melville, Labrador

et al. 2017

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Abstract:The sources and distribution of sediment and particulate organic carbon (OC) to Lake Melville, Labrador, were characterized to better understand impacts from climate and hydrological changes to the system. Mass accumulation rates (MARs) across the Lake Melville System (LMS) were established from 15 sediment cores collected in 2013 and 2014 by fitting excess 210 Pb ( 210 Pb ex ) profiles to a two-layer advection-diffusion model. MARs, validated using 137 Cs, varied between 0.04 and 0.41 g cm −2 a −1 , and overall decreased with increasing distance from the Churchill River, which drains into Goose Bay, a western extension of Lake Melville. The Churchill River is the greatest source of sediment to the system, but surprisingly, MARs were greatest in western Lake Melville rather than Goose Bay, reflecting the contribution of fine material carried eastward in the Churchill River plume and inputs from nearby tributaries. A comparison of 137 Cs and 210 Pb ex inventories to expected atmospheric fallout (1.5 and 23.6 disintegrations per minute (dpm) cm −2 , respectively) in sediment across the LMS suggests particles are largely sourced from the watershed. In eastern Lake Melville, elevated 210 Pb ex inventories and marine OC point to particle scavenging of dissolved 210 Pb from inflowing marine water. A transient tracer mixing model was used to determine the depth in each core where >90% of sediment was deposited before and after hydroelectric development at Churchill Falls (1970) and applied to down-core profiles of OC and organic carbon isotopes (␦ 13 C org ). We observed a significant increase of terrestrial OC to Lake Melville post 1970, which we interpret as change from climate or hydrology of the Churchill River.Résumé : Les sources et la répartition des sédiments et du carbone organique (CO) particulaire du lac Melville, au Labrador, ont été caractérisées pour mieux comprendre les impacts des changements climatiques et hydrologiques sur ce système. Les taux d'accumulation massique (TAM) à l'échelle du système du lac Melville (SLM) ont d'abord été établis à la lumière de 15 carottes de sédiments prélevées en 2013 et 2014, en calant les profils de 210 Pb excédentaire ( 210 Pb ex ) sur un modèle de advection-diffusion à deux couches. Les TAM, validés en utilisant le 137 Cs, vont de 0,04 à 0,41 g cm −2 a −1 , mais diminuent en s'éloignant de la rivière Churchill, qui se déverse dans la baie Goose, un prolongement vers l'ouest du lac Melville et la plus importante source de sédiments entrant dans le système. Étonnement, les TAM sont les plus élevés dans la partie occidentale du lac Melville, reflétant les apports de matériaux fins transportés vers l'est dans le panache de la rivière Churchill et de plus petits affluents situés à proximité. Une comparaison des inventaires de 137 Cs et de 210 Pb ex aux retombées atmosphériques attendues (1,5 et 23,6 désin-tégrations par minute (dpm) cm −2 , respectivement) dans les sédiments à l'échelle du SLM porte à croire que les particules proviennent en majeure partie du ba...

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Sedimentation and lateral transport of 210Pb over the East China Sea Shelf

Cited by 8 publications

References 37 publications

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

Deposition records of persistent organic pollutants and black carbon in dated sediment cores from China marginal seas: Implications for terrestrial sources and transport processes

Sources and accumulation of sediment and particulate organic carbon in a subarctic fjard estuary:²¹⁰Pb,¹³⁷Cs, and δ¹³C records from Lake Melville, Labrador

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Sedimentation and lateral transport of 210Pb over the East China Sea Shelf

Cited by 8 publications

References 37 publications

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea

Deposition records of persistent organic pollutants and black carbon in dated sediment cores from China marginal seas: Implications for terrestrial sources and transport processes

Sources and accumulation of sediment and particulate organic carbon in a subarctic fjard estuary:210Pb,137Cs, and δ13C records from Lake Melville, Labrador

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Sources and accumulation of sediment and particulate organic carbon in a subarctic fjard estuary:²¹⁰Pb,¹³⁷Cs, and δ¹³C records from Lake Melville, Labrador