Accumulation rates of bulk sediment and opal in surface sediments of the South Atlantic ...

• Main Authors: Geibert, Walter, Rutgers van der Loeff, Michiel M, Usbeck, Regina, Gersonde, Rainer, Kuhn, Gerhard, Seeberg-Elverfeldt, Jens
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Area/locality; Uranium-234; Uranium-234, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Reference/source; Comment; Method comment; Opal, biogenic silica; Reference of data; Bulk sediment, flux; Biogenic silica, flux; MultiCorer; CTD/Rosette; MiniCorer; Giant box corer; Gravity corer Kiel type; Piston corer BGR type; Measured; Calculated; ANT-XVIII/5a; ANT-XX/2; ANT-V/4; ANT-VI/3; ANT-VIII/3; ANT-IX/2; ANT-IX/3; ANT-X/5; ANT-X/6; ANT-XI/4; ANT-XII/4; Polarstern; Marine Geochemistry @ AWI AWI_MarGeoChem; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Indian; Pacific; Regina; Southern Ocean; Weddell; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.230042; https://doi.pangaea.de/10.1594/PANGAEA.230042

A set of 114 samples from the sediment surface of the Atlantic, eastern Pacific and western Indian sectors of the Southern Ocean has been analyzed for 230Th and biogenic silica. Maps of opal content, Th-normalized mass flux, and Th-normalized biogenic opal flux into the sediment have been derived. Significant differences in sedimentation patterns between the regions can be detected. The mean bulk vertical fluxes integrated into the sediment in the open Southern Ocean are found in a narrow range from 2.9 g/m**2 yr (Eastern Weddell Gyre) to 15.8 g/m**2 yr (Indian sector), setting upper and lower limits to the vertically received fraction of open ocean sediments. The silica flux to sediments of the Atlantic sector of the Southern Ocean is found to be 4.2 ± 1.4 * 10**11 mol/yr, just one half of the last estimate. This adjustment represents 6% of the output term in the global marine silica budget. ... : Supplement to: Geibert, Walter; Rutgers van der Loeff, Michiel M; Usbeck, Regina; Gersonde, Rainer; Kuhn, Gerhard; Seeberg-Elverfeldt, Jens (2005): Quantifying the opal belt in the Atlantic and southeast Pacific sector of the Southern Ocean by means of 230Th normalization. Global Biogeochemical Cycles, 19(4), GB4001 ...