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  • 1
    Publication Date: 2023-06-27
    Keywords: 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; Arabian Sea; Calculated; Carbon, organic, total; Carbon in carbonate; DEPTH, sediment/rock; Element analyser CHN, LECO; Gas chromatography; Gas chromatography - Mass spectrometry (GC-MS); KL; n-Alkane, C35/C31 ratio; PAKOMIN; Piston corer (BGR type); SO90; SO90_136KL; Sonne; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 355 data points
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  • 2
    Publication Date: 2023-06-27
    Keywords: 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; Alkenone, C37:3+C37:2; Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, LECO; Gas chromatography; Gas chromatography - Mass spectrometry (GC-MS); GS900963; Marion Dufresne (1972); MD65; MD90-963; n-Alkane, C35/C31 ratio; PC; Piston corer; SEYMAMA/SHIVA
    Type: Dataset
    Format: text/tab-separated-values, 583 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Schulte, Sonja; Rostek, Frauke; Bard, Edouard; Rullkötter, Jürgen; Marchal, Olivier (1999): Variations of oxygen-minimum and primary productivity recorded in sediments of the Arabian Sea. Earth and Planetary Science Letters, 173(3), 205-221, https://doi.org/10.1016/S0012-821X(99)00232-0
    Publication Date: 2023-06-27
    Description: Two deep-sea sediment cores from the northeastern and the southeastern Arabian Sea were studied in order to reconstruct the palaeoenvironments of the past glacial cycles. Core 136KL was recovered from the high-productivity area off Pakistan within the modern oxygen-minimum zone (OMZ). By contrast, modern primary productivity at the site of MD900963 close to Maldives is moderate and bottom waters are today well oxygenated. For both cores, we reconstructed the changes in palaeoproductivity using a set of biomarkers (alkenones, dinosterol and brassicasterol); the main result is that primary productivity is enhanced during glacial stages and lowered during interstadials. The proxies associated with productivity show a 23 kyr cyclicity corresponding to the precession-related insolation cycle. Palaeoredox conditions were studied in both cores using a new organic geochemical parameter (C35/C31-n-alkane ratio) developed by analysing surface sediments from a transect across the OMZ off Pakistan. The value of this ratio in core 136KL shows many variations during the last 65 kyr, indicating that the OMZ was not stable during this time: it disappeared completely during Heinrich- and the Younger Dryas events, pointing to a connection between global oceanic circulation and the stability of the OMZ. The C35/C31 ratio determined in sediments of core MD900963 shows that bottom waters remained rather well oxygenated over the last 330 kyr, which is confirmed by comparison with authigenic metal concentrations in the same sediments. A zonally averaged, circulation-biogeochemical ocean model was used to explore how the intermediate Indian Ocean responds to a freshwater flux anomaly at the surface of the North Atlantic. As suggested by the geochemical time series, both the abundance of Southern Ocean Water and the oxygen concentration are significantly increased in response to this freshwater perturbation.
    Keywords: Arabian Sea; GS900963; KL; Marion Dufresne (1972); MD65; MD90-963; PAKOMIN; PC; Piston corer; Piston corer (BGR type); SEYMAMA/SHIVA; SO90; SO90_136KL; Sonne
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    PANGAEA
    In:  Physikalisches Institut, Universität Bern
    Publication Date: 2023-07-20
    Keywords: AGE; Calculated from UK'37 (Müller et al, 1998); CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES I; Marion Dufresne (1995); MD101; MD952015; MD95-2015; Reykjanes Ridge; Sea surface temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 133 data points
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  • 5
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    PANGAEA
    In:  Supplement to: Hughen, Konrad A; Lehman, Scott J; Southon, John R; Overpeck, Jonathan T; Marchal, Olivier; Herring, C; Turnbull, J (2004): 14C Activity and Global Carbon Cycle Changes over the Past 50,000 Years. Science, 303(5655), 202-207, https://doi.org/10.1126/science.1090300
    Publication Date: 2024-01-09
    Description: A series of 14C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in 14C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation.
    Keywords: 165-1002; Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Cayman Rise, Caribbean Sea; Comment; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg165; Ocean Drilling Program; ODP; Sample code/label; Δ14C; Δ14C, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 3013 data points
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  • 6
    Publication Date: 2024-02-02
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated, error to older; Age, dated, error to younger; Amazon Fan; DEPTH, sediment/rock; GeoB; GeoB1515-2; Geosciences, University of Bremen; Giant box corer; GKG; M16/2; Meteor (1986); Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 7
    Publication Date: 2024-02-02
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated, error to older; Age, dated, error to younger; Amazon Fan; DEPTH, sediment/rock; GeoB; GeoB1515-1; Geosciences, University of Bremen; Gravity corer (Kiel type); M16/2; Meteor (1986); Sample code/label; SL
    Type: Dataset
    Format: text/tab-separated-values, 70 data points
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  • 8
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    PANGAEA
    In:  Supplement to: Vidal, Laurence; Schneider, Ralph R; Marchal, Olivier; Bickert, Torsten; Stocker, Thomas F; Wefer, Gerold (1999): Link between the North and South Atlantic during the Heinrich events of the last galcial period. Climate Dynamics, 15(12), 909-919, https://doi.org/10.1007/s003820050321
    Publication Date: 2024-02-02
    Description: High resolution benthic oxygen isotope records combined with radiocarbon datings, from cores retrieved in the North, Equatorial, and South Atlantic are used to establish a reliable cronostratigraphy for the last 60 ky. This common temporal framework enables us to study the timing of the sub-Milankovitch climate variability in the entire surface Atlantic during this period, as reflected in planktonic oxygen isotope records. Variations in sea surface temperatures in the Equatorial and South Atlantic reveal two warm periods during the mid-stage 3 which are correlated to the warming observed in the North Atlantic after Heinrich events (HL) 5 and 4. However, the records show that the warming started about 1500 y earlier in the South Atlantic. A zonally averaged ocean circulation model simulates a similar north-south thermal antiphasing between the latitudes of our coring sites, when pertubated by a freshwater flux anomaly. We infer that the observed phase relationship between the northern and the southern Atlantic is related to periods of reduced NADW production in the North Atlantic, such as during HL5 and HL4.
    Keywords: Amazon Fan; GeoB; GeoB1515-1; GeoB1515-2; GeoB1711; GeoB1711-4; Geosciences, University of Bremen; Giant box corer; GKG; Gravity corer (Kiel type); M16/2; M20/2; Meteor (1986); Namibia continental slope; SL
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 9
    Publication Date: 2024-02-02
    Keywords: Age model; Age model, optional; Age model in radiocarbon 14C ages; Amazon Fan; DEPTH, sediment/rock; GeoB; GeoB1515-1; Geosciences, University of Bremen; Gravity corer (Kiel type); Isotopic event; M16/2; Meteor (1986); SL
    Type: Dataset
    Format: text/tab-separated-values, 22 data points
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  • 10
    Publication Date: 2024-02-02
    Keywords: Age model; Age model, optional; Age model in radiocarbon 14C ages; DEPTH, sediment/rock; GeoB; GeoB1711; GeoB1711-4; Geosciences, University of Bremen; Gravity corer (Kiel type); Isotopic event; M20/2; Meteor (1986); Namibia continental slope; SL
    Type: Dataset
    Format: text/tab-separated-values, 22 data points
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