de.pangaea.dataset832011 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-30T23:54:36Z https://doi.pangaea.de/10.1594/PANGAEA.832011 2009-01-01 publication https://doi.org/10.1594/PANGAEA.832011 Bradtmiller, Louisa I https://orcid.org/0000-0001-6595-6095 information author Anderson, Robert F

boba@ldeo.columbia.edu

https://orcid.org/0000-0002-8472-2494 information author Fleisher, Martin Q

martyq@ldeo.columbia.edu

https://orcid.org/0000-0002-1141-8723 information author Burckle, Lloyd H author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Supplement to: Bradtmiller, Louisa I; Anderson, Robert F; Fleisher, Martin Q; Burckle, Lloyd H (2009): Comparing glacial and Holocene opal fluxes in the Pacific sector of the Southern Ocean. Paleoceanography, 24(2), PA2214, https://doi.org/10.1029/2008PA001693 The silicic acid leakage hypothesis (SALH) predicts that during glacial periods excess silicic acid was transported from the Southern Ocean to lower latitudes, which favored diatom production over coccolithophorid production and caused a drawdown of atmospheric CO2. Downcore records of 230Th-normalized opal (biogenic silica) fluxes from 31 cores in the Pacific sector of the Southern Ocean were used to compare diatom productivity during the last glacial period to that of the Holocene and to examine the evidence for increased glacial Si export to the tropics. Average glacial opal fluxes south of the modern Antarctic Polar Front (APF) were less than during the Holocene, while average glacial opal fluxes north of the APF were greater than during the Holocene. However, the magnitude of the increase north of the APF was not enough to offset decreased fluxes to the south, resulting in a decrease in opal burial in the Pacific sector of the Southern Ocean during the last glacial period, equivalent to approximately 15 Gt opal/ka1. This is consistent with the work of Chase et al. (2003, doi:10.1016/S0967-0645(02)00595-7), and satisfies the primary requirement of the SALH, assuming that the upwelled supply of Si was approximately equivalent during the Holocene and the glacial period. However, previous results from the equatorial oceans are inconsistent with the other predictions of the SALH, namely that either the Corg:CaCO3 ratio or the rate of opal burial should have increased during glacial periods. We compare the magnitudes of changes in the Southern Ocean and the tropics and suggest that Si escaping the glacial Southern Ocean must have had an alternate destination, possibly the continental margins. There is currently insufficient data to test this hypothesis, but the existence of this sink and its potential impact on glacial pCO2 remain interesting topics for future study. completed Bradtmiller, Louisa I https://orcid.org/0000-0001-6595-6095 information principalInvestigator copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 141.28 -64.77999999999997 -61.083 -50.67 1960-03-25T00:00:00 1968-10-18T00:00:00 0.0 7.805 Event label thematicClassification DEPTH, sediment/rock physicalMeasurement m m Depth, top/min physicalMeasurement m m Depth, bottom/max physicalMeasurement m m Age, dated physicalMeasurement Age, 14C AMS ka ka Age, dated, standard deviation physicalMeasurement Age, 14C AMS ± ± Laboratory code/label thematicClassification text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.832011?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: ELT11-003-PC * LATITUDE: -56.903000 * LONGITUDE: -115.243000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -4078.0 m * RECOVERY: 11.13 m * LOCATION: Southern East Pacific Rise * CAMPAIGN: ELT11 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1964-01-01T00:00:00 EVENT LABEL: ELT14.016-PC * LATITUDE: -58.988000 * LONGITUDE: -125.033000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -4572.0 m * RECOVERY: 6.42 m * CAMPAIGN: ELT14 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1964-01-01T00:00:00 EVENT LABEL: ELT14.017-PC * LATITUDE: -57.828000 * LONGITUDE: -124.947000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -3953.0 m * RECOVERY: 11.47 m * CAMPAIGN: ELT14 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1964-01-01T00:00:00 EVENT LABEL: ELT15.005-PC * LATITUDE: -58.017000 * LONGITUDE: -99.983000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -4371.0 m * RECOVERY: 3.06 m * CAMPAIGN: ELT15 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1964-01-01T00:00:00 EVENT LABEL: ELT15.014-TC * LATITUDE: -58.058000 * LONGITUDE: -120.142000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -4286.0 m * RECOVERY: 0.24 m * CAMPAIGN: ELT15 * BASIS: Eltanin * METHOD/DEVICE: Gravity corer 1964-01-01T00:00:00 EVENT LABEL: ELT15.028-PC * LATITUDE: -56.017000 * LONGITUDE: -149.817000 * DATE/TIME: 1964-01-01T00:00:00 * ELEVATION: -3359.0 m * RECOVERY: 13.42 m * CAMPAIGN: ELT15 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1964-01-01T00:00:00 EVENT LABEL: ELT17.007-PC * LATITUDE: -61.083000 * LONGITUDE: -134.350000 * DATE/TIME: 1965-01-01T00:00:00 * ELEVATION: -4505.0 m * RECOVERY: 7.26 m * CAMPAIGN: ELT17 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1965-01-01T00:00:00 EVENT LABEL: ELT20.013-PC * LATITUDE: -55.000000 * LONGITUDE: -105.383000 * DATE/TIME: 1965-01-01T00:00:00 * ELEVATION: -4400.0 m * RECOVERY: 7.82 m * CAMPAIGN: ELT20 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1965-01-01T00:00:00 EVENT LABEL: ELT21.020-PC * LATITUDE: -60.250000 * LONGITUDE: -120.167000 * DATE/TIME: 1965-01-01T00:00:00 * ELEVATION: -4782.0 m * RECOVERY: 12.22 m * CAMPAIGN: ELT21 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1965-01-01T00:00:00 EVENT LABEL: ELT25.016-PC * LATITUDE: -56.150000 * LONGITUDE: -156.217000 * DATE/TIME: 1966-01-01T00:00:00 * ELEVATION: -3662.0 m * RECOVERY: 6.06 m * CAMPAIGN: ELT25 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1966-01-01T00:00:00 EVENT LABEL: ELT27.023-PC * LATITUDE: -59.618000 * LONGITUDE: 155.238000 * DATE/TIME: 1966-01-01T00:00:00 * ELEVATION: -3208.0 m * RECOVERY: 9.53 m * CAMPAIGN: ELT27 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1966-01-01T00:00:00 EVENT LABEL: ELT33.019-PC * LATITUDE: -59.855000 * LONGITUDE: -119.665000 * DATE/TIME: 1968-01-01T00:00:00 * ELEVATION: -4457.0 m * RECOVERY: 4.77 m * CAMPAIGN: ELT33 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1968-01-01T00:00:00 EVENT LABEL: ELT36.036-PC * LATITUDE: -60.388000 * LONGITUDE: 157.533000 * DATE/TIME: 1968-10-18T00:00:00 * ELEVATION: -2835.0 m * RECOVERY: 5.97 m * CAMPAIGN: ELT36 * BASIS: Eltanin * METHOD/DEVICE: Piston corer 1968-10-18T00:00:00 EVENT LABEL: RC08-71 * LATITUDE: -58.050000 * LONGITUDE: 155.730000 * DATE/TIME: 1964-02-22T00:00:00 * ELEVATION: -3224.0 m * RECOVERY: 8.67 m * CAMPAIGN: RC08 * BASIS: Robert Conrad * METHOD/DEVICE: Piston corer 1964-02-22T00:00:00 EVENT LABEL: V16-115 * LATITUDE: -55.680000 * LONGITUDE: 141.280000 * DATE/TIME: 1960-03-25T00:00:00 * ELEVATION: -3147.0 m * RECOVERY: 10.2 m * CAMPAIGN: V16 * BASIS: Vema * METHOD/DEVICE: Piston corer 1960-03-25T00:00:00 EVENT LABEL: V16-121 * LATITUDE: -50.670000 * LONGITUDE: 164.380000 * DATE/TIME: 1960-04-02T00:00:00 * ELEVATION: -3614.0 m * RECOVERY: 10.42 m * CAMPAIGN: V16 * BASIS: Vema * METHOD/DEVICE: Piston corer 1960-04-02T00:00:00 EVENT LABEL: V18-93 * LATITUDE: -59.480000 * LONGITUDE: -64.780000 * DATE/TIME: 1962-03-09T00:00:00 * ELEVATION: -3834.0 m * RECOVERY: 5.31 m * CAMPAIGN: V18 * BASIS: Vema * METHOD/DEVICE: Piston corer 1962-03-09T00:00:00