Geibert, Walter; Rutgers van der Loeff, Michiel M; Usbeck, Regina; Gersonde, Rainer; Kuhn, Gerhard; Seeberg-Elverfeldt, Jens (2005): Accumulation rates of bulk sediment and opal in surface sediments of the South Atlantic [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.230042, Supplement to: Geibert, W et al. (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, https://doi.org/10.1029/2005GB002465
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Abstract:
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.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -62.291838 * Median Longitude: -26.850695 * South-bound Latitude: -78.245160 * West-bound Longitude: -121.247000 * North-bound Latitude: -43.186667 * East-bound Longitude: 38.826667
Date/Time Start: 1987-01-23T21:39:00 * Date/Time End: 2003-01-15T06:08:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
PS58/251-1 * Latitude: -68.625000 * Longitude: -97.122000 * Date/Time Start: 2001-03-08T04:26:00 * Date/Time End: 2001-03-08T05:08:00 * Elevation: -2819.0 m * Recovery: 0.18 m * Location: Southeast Pacific * Campaign: ANT-XVIII/5a (PS58) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
PS58/252-1 * Latitude: -68.187000 * Longitude: -97.155000 * Date/Time Start: 2001-03-08T10:51:00 * Date/Time End: 2001-03-08T11:52:00 * Elevation: -4507.0 m * Recovery: 0.38 m * Location: Southeast Pacific * Campaign: ANT-XVIII/5a (PS58) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
PS58/253-2 * Latitude: -69.308000 * Longitude: -107.562000 * Date/Time Start: 2001-03-09T17:46:00 * Date/Time End: 2001-03-09T18:35:00 * Elevation: -3721.0 m * Recovery: 0.42 m * Location: Southeast Pacific * Campaign: ANT-XVIII/5a (PS58) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Area/locality | Area | Geibert, Walter | as defined in Geibert et al. 2005 | ||
| 7 | Uranium-234 | 234U | dpm/g | Geibert, Walter | Measured | |
| 8 | Uranium-234 | 234U | dpm/g | Geibert, Walter | Calculated | from 232Thorium according to Walter et al. 1997 |
| 9 | Uranium-234, standard deviation | 234U std dev | ± | Geibert, Walter | Measured | |
| 10 | Thorium-230 excess | 230Th xs | dpm/g | Geibert, Walter | ||
| 11 | Thorium-230 excess, standard deviation | 230Th xs std dev | ± | Geibert, Walter | ||
| 12 | Reference/source | Reference | Geibert, Walter | for 230Thorium excess | ||
| 13 | Comment | Comment | Geibert, Walter | |||
| 14 | Method comment | Method comm | Geibert, Walter | Method for BSi | ||
| 15 | Opal, biogenic silica | bSiO2 | % | Geibert, Walter | ||
| 16 | Reference of data | Ref data | Geibert, Walter | for BSi data | ||
| 17 | Bulk sediment, flux | Bulk flux | g/m2/a | Geibert, Walter | ||
| 18 | Biogenic silica, flux | bSiO2 flux | mmol/m2/a | Geibert, Walter |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1759 data points