Continental Shelf Research

ISSN: 0278-4343
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  • This file contains supplemental data for a manuscript entitled, "Retention of alluvial sediment in the tidal delta of a river draining a small, mountainous coastal watershed," published in Continental Shelf Research. Data files include particle size distribution, sediment core chronologies, sediment elemental abundance, and sediment bulk density and organic content for eight analyzed sediment cores. Data is in excel format; description is found in at the readme tab in each file.
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  • A sampling of 179 stations (regular grid, distance of 500 m between stations) was conducted in January and February 2016 (on 19, 20, 21 January 2016, with tidal coefficients of 56 to 72; and on 13 February 2016, with a tidal coefficient of 94) using a 0.04 m2 Shipeck grab aboard the GPMH (Grand Port Maritime du Havre) vessel “Le Marais”, between the Cap de la Hève and the Cap d’Antifer (Bay of Seine). Colum A to C: Coordinates in decimal degrees for all stations studied between Cape Hève and Cape Antifer. Column D to I, XRF measurement results (Xsort, ppm) for Si (silicon), S (sulphide), As (arsenic), BrOrg (organic bromine), Rb (rubidium), Pb (lead). Column J: TOC content obtained by combustion in a LECO CS 744 carbon sulphur analyzer (%). Column K and L: mediane and mean of Particule size, analyzed with laser diffraction particle-size analysez. Column M: group defined for interpretation into publication.
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  • Data provided with this paper: - Spreadsheet with values for marine relative flooded area, flooding magnitude, flooding rate and coastline length, for each sea-level increment and latitudinal zone (GBR_flooding_summary_latitudinal_zones.xlsx) - Files with values for marine relative flooded area, flooding magnitude, flooding rate and coastline length grouped by sub-region (COASTLINE_length_subRegions.csv, COASTLINE_length_change_subRegions.csv, SHELF_relative_flooding_subRegions.csv, SHELF_flooding_magnitude_rate_subRegions.csv, SHELF-MARGIN_relative_flooding_subRegions.csv, SHELF-MARGIN_flooding_magnitude_rate_subRegions.csv). - Spreadsheet with age control for shelf-edge boreholes shown in Figure 2 and some plots (Age_control_cores_GR.xlsx). Data extracted from Felis et al. (2014) and Webster et al. (2011) and used to link the boreholes and Gamma ray logs to the flooding curves.
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  • Sheet 1:sample metadata Sheet 2: palynofacies counts Sheet 3: dinocyst counts Sheet 4: miospore counts
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  • ES-1: Location of sampling stations. The results of the geochemical and mineralogical analysis as well as Pearson correlation coefficients (r). ES-2: Supplementary Figures S1-S7
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  • Abstract: The role of small scale single turbulent events in the vertical mixing of near bed suspended sediments was explored in a shallow shelf sea environment. High frequency velocity and suspended sediment concentration (SSC; calibrated from the backscatter intensity) were collected using an Acoustic Doppler Velocimeter (ADV). Using quadrant analysis, the despiked velocity time series was divided into turbulent events and small background fluctuations. Reynolds stress and Turbulent Kinetic Energy (TKE) calculated from all velocity samples, were compared to the same turbulent statistics calculated only from velocity samples classified as turbulent events (Re_events and TKE_events). The comparison showed that Re_events and TKE_events was increased 3 and 1.6 times, respectively, when small background fluctuations were removed and that the correlation with SSC for TKE could be improved through removal of the latter. The correlation between instantaneous vertical turbulent flux (w') and SSC fluctuations (SSC') exhibits a tidal pattern with the maximum correlation at peak ebb and flood currents, when strong turbulent events appear. Individual turbulent events were characterized by type, strength, duration and length. Cumulative vertical turbulent sediment fluxes and average SSC associated with individual turbulent events were calculated. Over the tidal cycle, ejections and sweeps were the most dominant events, transporting 50% and 36% of the cumulative vertical turbulent event sediment flux, respectively. Although the contribution of outward interactions to the vertical turbulent event sediment flux was low (11%), single outward interaction events were capable of inducing similar SSC' as sweep events. The results suggest that on time scales of tens of minutes to hours, TKE may be appropriate to quantify turbulence in sediment transport studies, but that event characteristics, particular the upward turbulent flux need to be accounted for when considering sediment transport on process time scales. Category: geoscientificInformation Source: Supplement to: Amirshahi, Seyed Mohammad; Kwoll, Eva; Winter, Christian (2018): Near bed suspended sediment flux by single turbulent events. Continental Shelf Research, 152, 76-86, https://doi.org/10.1016/j.csr.2017.11.005 Supplemental Information: Not Availble Coverage: Not Available
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  • Abstract: The branched vs. isoprenoid tetraethers (BIT) index, which is based on the relative abundance of non-isoprenoidal, so-called branched glycerol dialkyl glycerol tetraethers (brGDGTs) versus a structurally related isoprenoid GDGT "crenarchaeol", has been used to trace soil organic carbon (OC) from the continent to the ocean. However, it has been found in some locations that the BIT index can be primarily influenced by crenarchaeol concentrations and brGDGT production in fresh water rather than by soil-derived brGDGT concentrations. This may hamper the application of this proxy as an indicator for the input of soil OC. Here we examined the concentration and distribution of brGDGTs as well as variations in the BIT index in marine surface sediments from five transects (Douro, Mondego, Estremadura, Tagus, and Sado) along the southern Portuguese continental margin and in marine suspended particulate matter (SPM) from the Douro and Tagus transects. Higher BIT values and brGDGT concentrations (normalized to OC content) were found close to the river mouths and coast than in deep offshore sites. This clearly indicated the continental input of brGDGTs and revealed that, at least in this setting, the BIT index was primarily influenced by the delivery of brGDGTs from the rivers. However, the BIT index was also, to a minor extent, influenced by crenarchaeol concentrations. This shows that the brGDGT concentration may provide a more straightforward indication of continental OC input than the BIT index. BrGDGT concentrations and distributions in sediments and SPM close to the rivers were similar to those of SPM in the Tagus River. This indicates that degradation processes in the estuaries had no significant effect on the riverine brGDGTs. Therefore, brGDGTs should be a good indicator for the rigid OC fraction transported from the continent to the ocean. Our results also indicate that there are multiple sources of brGDGTs in the marine environment, which complicates the use of the brGDGT distribution as an indicator for terrestrial vs. marine produced brGDGTs. Category: geoscientificInformation Source: Supplement to: Zell, Claudia; Kim, Jung-Hyun; Dorhout, Denise J C; Baas, Marianne; Sinninghe Damsté, Jaap S (2015): Sources and distributions of branched tetraether lipids and crenarchaeol along the Portuguese continental margin: Implications for the BIT index. Continental Shelf Research, 96, 34-44, https://doi.org/10.1016/j.csr.2015.01.006 Supplemental Information: Not Availble Coverage: Not Available
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  • Abstract: Benthic oxygen and nitrogen fluxes were quantified within the years 2012 to 2014 at different time series sites in the southern North Sea with the benthic lander NuSObs (Nutrient and Suspension Observatory). In situ incubations of sediments, in situ bromide tracer studies, sampling of macrofauna and pore water investigations revealed considerable seasonal and spatial variations of oxygen and nitrogen fluxes. Seasonal and spatial variations of oxygen fluxes were observed between two different time series sites, covering different sediment types and/or different benthic macrofaunal communities. On a sediment type with a high content of fine grained particles (<63 µm) oxygen fluxes of -15.5 to -25.1 mmol/m**2/d (June 2012), -2.0 to -8.2 mmol/m**2/d (March 2013), -16.8 to -21.5 mmol/m**2/d (November 2013) and -6.1 mmol/m**2/d (March 2014) were measured. At the same site a highly diverse community of small species of benthic macrofauna was observed. On a sediment type with a low content of fine grained particles (<63 µm) high oxygen fluxes (-33.2 mmol/m**2/d August 2012; -47.2 to -55.1 mmol/m**2/d November 2013; -16.6 mmol/m**2/d March 2014) were observed. On this sediment type a less diverse benthic macrofaunal community, which was dominated by the large bodied suspension feeder Ensis directus, was observed. Average annual rain rates of organic carbon and organic nitrogen to the seafloor of 7.44 mol C/m**2/y and 1.34 mol N/m**2/y were estimated. On average 79% of the organic bound carbon and 95% of the organic bound nitrogen reaching the seafloor are recycled at the sediment-water interface. Category: geoscientificInformation Source: Supplement to: Oehler, Till; Martinez, Roi; Schückel, Ulrike; Winter, Christian; Kröncke, Ingrid; Schlüter, Michael (2015): Seasonal and spatial variations of benthic oxygen and nitrogen fluxes in the Helgoland Mud Area (southern North Sea). Continental Shelf Research, 106, 118-129, https://doi.org/10.1016/j.csr.2015.06.009 Supplemental Information: Not Availble Coverage: Not Available
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