/* DATA DESCRIPTION: Citation: Ledford-Hoffman, P A; DeMaster, David J; Nittrouer, Charles A (1986): Silicate and opal in the Ross Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.58017, Supplement to: Ledford-Hoffman, PA et al. (1986): Biogenic-silica accumulation in the Ross Sea and the importance of Antarctic continental-shelf deposits in the marine silica budget. Geochimica et Cosmochimica Acta, 50(9), 2099-2110, https://doi.org/10.1016/0016-7037(86)90263-2 Abstract: Thirty-five box cores were collected from the continental shelf in the Ross Sea during cruises in January and February, 1983. Pb-210 and Pu-239, 240 geochronologies coupled with biogenic-silica measurements were used to calculate accumulation rates of biogenic silica. Sediment in the southern Ross Sea accumulates at rates ranging from <=0.6 to 2.7 mm/y, with the highest values occurring in the southwestern Ross Sea. Biogenic-silica content in surface sediments ranges from 2% (by weight) in Sulzberger Bay and the eastern Ross Sea to 41% in the southwestern Ross Sea. Biogenic-silica accumulation in the southwestern Ross Sea averages 2.7 * 10**-2 g/cm**2/y and is comparable to accumulation rates in high-productivity, upwelling environments from low-latitude continental margins (e.g., Gulf of California, coast of Peru). The total rate of biogenic-silica accumulation in the southern Ross Sea is approximately 0.2 * 10**14 g/y, with most of the accumulation occurring in basins (500-1000 m water depth). If biogenic-silica accumulation in the southern Ross Sea continental shelf is typical of other basins on the Antarctic continental shelf, as much as 1.2 * 10**14 g/y of silica could be accumulating in these deposits. Biogenic-silica accumulation on the Antarctic continental shelf may account for as much as a fourth of the dissolved silica supplied to the world ocean by rivers and hydrothermal vents. Project(s): Silicon Cycling in the World Ocean (SINOPS) Funding: Fourth Framework Programme (FP4), grant/award no. MAS3970141: Silicon Cycling in the World Ocean (URI: https://cordis.europa.eu/project/id/MAS3970141) Coverage: MEDIAN LATITUDE: -76.767656 * MEDIAN LONGITUDE: -175.446250 * SOUTH-BOUND LATITUDE: -78.700000 * WEST-BOUND LONGITUDE: 164.700000 * NORTH-BOUND LATITUDE: -73.150000 * EAST-BOUND LONGITUDE: -152.510000 MINIMUM DEPTH, sediment/rock: -0.100 m * MAXIMUM DEPTH, sediment/rock: 0.405 m Event(s): Ledford * METHOD/DEVICE: Box corer (BC) (URI: http://en.wikipedia.org/wiki/Box_corer) * COMMENT: Position not given Parameter(s): Sample, optional label/labor no (Lab no) * PI: Ledford-Hoffman, P A Depth, bathymetric [m] (Bathy depth) * PI: Ledford-Hoffman, P A LATITUDE (Latitude) * GEOCODE LONGITUDE (Longitude) * GEOCODE DEPTH, sediment/rock [m] (Depth sed) * GEOCODE Depth, top/min [m] (Depth top) * PI: Ledford-Hoffman, P A Depth, bottom/max [m] (Depth bot) * PI: Ledford-Hoffman, P A Opal, biogenic silica [%] (bSiO2) * PI: Ledford-Hoffman, P A * METHOD/DEVICE: Opal, extraction; DeMaster, 1981 (URI: https://doi.org/10.1016/0016-7037(81)90006-5) Silicate [µmol/l] (Si(OH)4) * PI: Ledford-Hoffman, P A License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 113 data points */ Lab no Bathy depth [m] Latitude Longitude Depth sed [m] Depth top [m] Depth bot [m] bSiO2 [%] Si(OH)4 [µmol/l] DF83III-6 -78.7000 -178.5000 -0.100 65.000 DF83III-6 -78.7000 -178.5000 0.005 0.000 0.010 24.00 340.000 DF83III-6 -78.7000 -178.5000 0.015 420.000 DF83III-6 -78.7000 -178.5000 0.025 520.000 DF83III-6 -78.7000 -178.5000 0.035 540.000 DF83III-6 -78.7000 -178.5000 0.085 650.000 DF83III-6 -78.7000 -178.5000 0.105 0.100 0.110 23.60 DF83III-6 -78.7000 -178.5000 0.145 700.000 DF83III-6 -78.7000 -178.5000 0.225 0.220 0.230 26.00 DF83III-6 -78.7000 -178.5000 0.405 0.400 0.410 20.50 DF83III-28 -1024.0 -76.8300 -152.5100 0.005 0.000 0.010 2.00 DF83III-28 -1025.0 -76.8300 -152.5100 0.105 0.100 0.110 0.50 DF83III-28 -1026.0 -76.8300 -152.5100 0.225 0.220 0.230 0.70 DF83III-29 -933.0 -76.7250 -152.6500 -0.100 85.000 DF83III-29 -933.0 -76.7250 -152.6500 0.005 270.000 DF83III-29 -933.0 -76.7250 -152.6500 0.015 275.000 DF83III-29 -933.0 -76.7250 -152.6500 0.025 280.000 DF83III-29 -933.0 -76.7250 -152.6500 0.045 330.000 DF83III-29 -933.0 -76.7250 -152.6500 0.075 320.000 DF83III-29 -933.0 -76.7250 -152.6500 0.105 310.000 DF83II-2 -76.3500 164.7000 0.005 0.000 0.010 16.70 DF83II-2 -76.3500 164.7000 0.085 0.080 0.090 13.80 DF83II-2 -76.3500 164.7000 0.205 0.200 0.210 12.70 DF83II-2 -76.3500 164.7000 0.285 0.280 0.290 8.70 DF83II-27 -76.0000 172.0000 0.005 0.000 0.010 35.00 DF83II-27 -76.0000 172.0000 0.105 0.100 0.110 37.00 DF83II-27 -76.0000 172.0000 0.225 0.220 0.230 39.00 DF83II-27 -76.0000 172.0000 0.375 0.370 0.380 31.00 DF83II-10 -73.1500 167.5000 0.005 0.000 0.010 40.70 DF83II-10 -73.1500 167.5000 0.105 0.100 0.110 38.00 DF83II-10 -73.1500 167.5000 0.225 0.220 0.230 43.90 DF83II-10 -73.1500 167.5000 0.405 0.400 0.410 48.30