Sediment carbon stores in Greenland seagrass meadows

• Main Authors: Marbà, Núria, Krause-Jensen, Dorte, Masqué, Pere, Duarte, Carlos M.
• Other Authors: European Commission, King Abdullah University of Science and Technology, Danish Council for Strategic Research, Generalitat de Catalunya, Marbà, Núria [e-mail]
• Format: Dataset
• Language: English
• Published: DIGITAL.CSIC 2018
• Subjects: Sediment; Organic carbon; Inorganic carbon; Carbonate; Organic matter; Sediment dating; 210Pb; d13C seagrass; Zostera marina; Greenland; Ameralik; Appleby; Cabeza; Kapisillit; Kobbefjord; Oldfield
• Online Access: http://hdl.handle.net/10261/169555; https://doi.org/10.20350/digitalCSIC/8565; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100004052; https://doi.org/10.13039/501100002809

The dataset contains data on profiles of bulk density, concentrations of organic matter, carbonate, organic carbon and inorganic carbon, density of organic and inorganic carbon, δ13C and abundance of 210Pb along sediment cores. The sediment cores were collected inside three Zostera marina meadows growing in Western Greenland: Ameralik (64°15’N, 51°35’W), Kapisillit (64°28’N, 50°13’W) and Kobbefjord (64°09’N, 51°33’W) (Marbà et al 2018). The sediment cores were sliced every 1 or 2 cm depending on the core. Dry bulk density was measured by dividing the weight after oven-drying them at 60 oC for 48 h by the wet volume of the sediment sample. Concentration of total 210Pb was determined by alpha spectrometry following Sanchez-Cabeza et al. (1998) . The concentration of excess 210Pb was calculated as total 210Pb minus supported 210Pb, estimated as the average of total 210Pb concentration at the base of each sediment core profile. Supported 210Pb values were comparable to the 226Ra concentrations obtained at selected depths in each core. The depth of the sediment horizon accreted since year 1900 was identified by applying constant flux: constant sedimentation (CF:CS) model (Krishnaswamy et al 1971) and the year of sediment accretion at the top of each slice by applying the constant rate of supply (CRS) model (Appleby and Oldfield 1978) . Organic matter concentration (OM, % DW) was measured using the loss of ignition technique. Sediment organic carbon concentrations (Corg, % DW) were estimated from measured organic matter concentrations (OM, % DW) using the relationship described by Fourqurean et al. (2012). Concentration of inorganic carbon (Cinorg, %DW) was measured by conducting a second combustion of the sediment samples at 1000 oC for 2 h and multiplying the amount of CO2 released from the carbonate by 0.27 (i.e. the ratio of the atomic weight of carbon (12 g) to the molecular weight of CO2 (44 g)). Densities of Corg (g Corg cm-3) and Cinorg (g Cinorg cm-3) were calculated by multiplying, respectively, Corg and ...