Data Description

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Citation:
Geibert, W et al. (2005): Accumulation rates of bulk sediment and opal in surface sediments of the South Atlantic. doi:10.1594/PANGAEA.230042,
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, 13 pp, doi:10.1029/2005GB002465
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):
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo) *
Coverage:
Median Latitude: -62.291839 * Median Longitude: -26.850695 * South-bound Latitude: -78.245167 * West-bound Longitude: -121.247000 * North-bound Latitude: -43.186667 * East-bound Longitude: 38.826667
Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 0.0 m
Event(s):
PS1477-1 (PS10/684) * * Latitude: -70.102000 * Longitude: -6.772500 * Date/Time: 1987-01-23T21:39:00 * Elevation: -1950.0 m * Recovery: 0.30 m * Penetration: 0.32 m * Location: Atka Bay * * Campaign: ANT-V/4 (PS10) * * Basis: Polarstern * * Device: Giant box corer * * Comment: 2 Rohre
PS1478-1 (PS10/686) * * Latitude: -70.377167 * Longitude: -12.587833 * Date/Time: 1987-01-24T14:01:00 * Elevation: -2227.0 m * Recovery: 0.50 m * Penetration: 0.50 m * Location: Barents Sea * * Campaign: ANT-V/4 (PS10) * * Basis: Polarstern * * Device: Giant box corer *
PS1480-2 (PS10/690) * * Latitude: -70.781500 * Longitude: -12.639333 * Date/Time: 1987-01-25T15:25:00 * Elevation: -2077.0 m * Recovery: 0.40 m * Penetration: 0.40 m * Location: Kapp Norvegia * * Campaign: ANT-V/4 (PS10) * * Basis: Polarstern * * Device: Giant box corer *
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Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventMetadata
2LATITUDE *LatitudeGeocode
3LONGITUDE *LongitudeGeocode
4Elevation of eventElevationmMetadata
5DEPTH, sediment/rock *DepthmGeocode
6Area/locality *AreaGeibert, Walter *as defined in Geibert et al. 2005
7Uranium 234 *234Udpm/gGeibert, Walter *measured *
8Uranium 234 *234Udpm/gGeibert, Walter *calculated *from 232Thorium according to Walter et al. 1997
9Uranium 234, standard deviation *234U std dev±Geibert, Walter *measured *
10Thorium 230 excess *230Th xsdpm/gGeibert, Walter *
11Thorium 230 excess, standard deviation *230Th xs std dev±Geibert, Walter *
12Reference/source *ReferenceGeibert, Walter *for 230Thorium excess
13Comment *CommentGeibert, Walter *
14Method comment *MethodGeibert, Walter *Method for BSi
15Opal, biogenic silica *bSiO2%Geibert, Walter *
16Reference of data *Ref dataGeibert, Walter *for BSi data
17Bulk sediment, flux *Bulk fluxg/m2/aGeibert, Walter *
18Biogenic silica, flux *bSiO2 fluxmmol/m2/aGeibert, Walter *
License:
CC-BY Creative Commons Attribution 3.0 Unported
Size:
1759 data points

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