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  • 1
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    Paleotemperatures, stable isotopes and alkenones of samples from the South Atlantic (2004)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): Alkenone, Ep; Alkenone, δ13C; Amazon Fan; Angola Basin; B_LANDER; Bottom lander; Brazil Basin; Calculated; Calculated from UK'37 (Prahl et al., 1988); Carbon dioxide, dissolved; Carbon dioxide, partial pressure; DEPTH, sediment/rock; Elevation of event; Event label; Gas chromatography; GeoB; GeoB1008-6; GeoB1016-3; GeoB1501-1; GeoB1503-2; GeoB1505-3; GeoB1508-1; GeoB1515-2; GeoB1703-5; GeoB1706-1; GeoB1711-2; GeoB1719-5; GeoB1903-1; GeoB2102-1; GeoB2125-2; GeoB2215-8; Geosciences, University of Bremen; Giant box corer; GIK17843-1; GKG; Gravity corer (Kiel type); Latitude of event; Longitude of event; M16/2; M20/2; M23/2; M23/3; M6/6; Mass spectrometer Finnigan MAT 252; Meteor (1986); Mid Atlantic Ridge; MUC; MultiCorer; Namibia Continental Margin; Namibia continental slope; off Kunene; Phosphate; Photometer, molybdene blue, reduct SnCl; Sea surface temperature, annual mean; SFB261; SL; SO84; Sonne; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; ST. HELENA HOTSPOT; Walvis Ridge; δ15N, gas
    Materialart: Dataset
    Format: text/tab-separated-values, 119 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 2
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    Total organic carbon, alkenones and sea surface temperature of sediment core GeoB1711-4 (2001)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Alkenone, unsaturation index UK'37; Calculated from C37 alkenones (Prahl & Wakeham, 1987); Calculated from UK'37 (Prahl et al., 1988); Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN; Gas chromatography; GeoB; GeoB1711; GeoB1711-4; Geosciences, University of Bremen; Gravity corer (Kiel type); Heptatriaconta-15E,22E-dien-2-one; Heptatriaconta-8E,15E,22E-trien-2-one; M20/2; Meteor (1986); Namibia continental slope; Sea surface temperature, annual mean; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
    Materialart: Dataset
    Format: text/tab-separated-values, 1090 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
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    Total organic carbon, alkenones and sea surface temperature of sediment core GeoB1712-4 (2001)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Alkenone, unsaturation index UK'37; Calculated from C37 alkenones (Prahl & Wakeham, 1987); Calculated from UK'37 (Prahl et al., 1988); Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN; Gas chromatography; GeoB; GeoB1712-4; Geosciences, University of Bremen; Gravity corer (Kiel type); Heptatriaconta-15E,22E-dien-2-one; Heptatriaconta-8E,15E,22E-trien-2-one; M20/2; Meteor (1986); Namibia continental slope; Sea surface temperature, annual mean; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
    Materialart: Dataset
    Format: text/tab-separated-values, 1255 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Paleotemperatures, stable isotopes and alkenones of samples from the South Atlantic (1999)
    PANGAEA
    In:  Supplement to: Andersen, Nils; Müller, Peter J; Kirst, Georg; Schneider, Ralph R (1999): Alkenone d13C as a Proxy for Past PCO2 in Surface Waters: Results from the Late Quaternary Angola Current. In: Fischer, G & Wefer, G (eds.), Use of Proxies in Paleoceanography - Examples from the South Atlantic, Springer, Berlin, Heidelberg, 469-488
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Carbon dioxide is one of the most important greenhouse gases which are increasing in atmospheric concentration due to human activities. For using natural CO2 dynamics as a key to understanding the climatic consequences of anthropogenic pCO2 rise, the ocean plays an important role due to its much larger carbon pool compared to the atmosphere. By studying the ratio of stable carbon isotopes in organic matter from marine sediments, it is possible to estimate the partial pressure of CO2 in surface waters during ancient times. The organic compound C37:2 alkenone, whose sole origin is from autotrophic marine algae, was chosen for d13C analysis and its isotopic composition used to reconstruct past PCO2 levels in the surface layer of the eastern Angola Basin for the last 200,000 years. In addition to the variation of ancient concentrations of dissolved CO2 ([CO2(aq)] = ce), the effect of carbon demand which depends on algal growth rate was considered. Here to, carbon isotopic fractionation of C37:2 alkenones (ep) in core-top sediments from the equatorial and the South Atlantic was calibrated against pre-industrial [CO2(aq)] and phosphate concentrations in surface waters. From these data, a variable b = (25 per mil - ep) * ce which reflects intracellular carbon demand was calculated. This variable b correlates with the ambient concentration of seawater phosphate and depends on growth rates. The bulk sediment d15N was used as a proxy parameter for calculating ancient b-values, taking into account that d15N in core-top sediments is correlated to phosphate concentration in modern surface waters. On this basis, the alkenone d13C record of GeoB1016-3 documents a permanent oceanic source for atmospheric carbon dioxide during the last 200,000 years. As a consequence of using d15N derived b-values instead of b = constant, the Angola Basin appears to have been an even stronger CO2 source during glacial periods than at present. Qualitatively similar results were reported by Jasper et al. (1994) for the central Equatorial Pacific. These observations suggest that enhanced productivity of low-latitude upwelling areas during glacial periods is not responsible for the lower CO2 content of the glacial atmosphere.
    Schlagwort(e): Amazon Fan; Angola Basin; B_LANDER; Bottom lander; Brazil Basin; GeoB; GeoB1008-6; GeoB1016-3; GeoB1501-1; GeoB1503-2; GeoB1505-3; GeoB1508-1; GeoB1515-2; GeoB1703-5; GeoB1706-1; GeoB1711-2; GeoB1719-5; GeoB1903-1; GeoB2102-1; GeoB2125-2; GeoB2215-8; Geosciences, University of Bremen; Giant box corer; GIK17843-1; GKG; Gravity corer (Kiel type); M16/2; M20/2; M23/2; M23/3; M6/6; Meteor (1986); Mid Atlantic Ridge; MUC; MultiCorer; Namibia Continental Margin; Namibia continental slope; off Kunene; SFB261; SL; SO84; Sonne; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; ST. HELENA HOTSPOT; Walvis Ridge
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
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    Alkenones and SST of surface sediments (Appendix) (1998)
    PANGAEA
    In:  Supplement to: Müller, Peter J; Kirst, Georg; Ruhland, Götz; Von Storch, Isabel; Rosell-Melé, Antoni (1998): Calibration of the alkenone paleotemperature index UK'37 based on core-tops from the eastern South Atlantic and the global ocean (60°N-60°S). Geochimica et Cosmochimica Acta, 62(10), 1757-1772, https://doi.org/10.1016/S0016-7037(98)00097-0
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: We have analysed alkenones in 149 surface sediments from the eastern South Atlantic in order to establish a sediment-based calibration of the U37K' paleotemperature index. Our study covers the major tropical to subpolar production systems and sea-surface temperatures (SST's) between 0° and 27°C. In order to define the most suitable calibration for this region, the U37K' values were correlated to seasonal, annual, and production-weighted annual mean atlas temperatures and compared to previously published culture and core-top calibrations. The best linear correlation between U37K' and SST was obtained using annual mean SST from 0 to 10 m water depth (U37K' = 0.033 T + 0.069, r**2 = 0.981). Data scattering increased significantly using temperatures of waters deeper than 20 m, suggesting that U37K' reflects mixed-layer SST and that alkenone production at thermocline depths was not high enough to significantly bias the mixed-layer signal. Regressions based on both production-weighted and on actual annual mean atlas SST were virtually identical, indicating that regional variations in the seasonality of primary production have no discernible effect on the U37K' vs. SST relationship. Comparison with published core-top calibrations from other oceanic regions revealed a high degree of accordance. We, therefore, established a global core-top calibration using U37K' data from 370 sites between 60°S and 60°N in the Atlantic, Indian, and Pacific Oceans and annual mean atlas SST (0-29°C) from 0 m water depth. The resulting relationship (U37K' = 0.033 T + 0.044, r**2 = 958) is identical within error limits to the widely used E. huxleyi calibrations of and attesting their general applicability. The observation that core-top calibrations extending over various biogeographical coccolithophorid zones are strongly linear and in better accordance than culture calibrations suggests that U37K' is less species-dependent than is indicated by culture experiments. The results also suggest that variations in growth rate of algae and nutrient availability do not significantly affect the sedimentary record of U37K' in open ocean environments.
    Schlagwort(e): Agulhas Basin; Agulhas Ridge; Alkenone, unsaturation index UK'37; Angola Benguela Front; Angola Diapir Field; ANT-VIII/3; ANT-XI/2; Atlantic Ridge; Brazil Basin; Calculated from C37 alkenones (Brassell et al., 1986); Cape Basin; Congo Fan; DEPTH, sediment/rock; East Brazil Basin; Elevation of event; Equatorial Atlantic; Event label; GeoB; GeoB1005-2; GeoB1006-2; GeoB1007-2; GeoB1008-6; GeoB1010-3; GeoB1015-2; GeoB1016-2; GeoB1017-3; GeoB1020-1; GeoB1023-2; GeoB1024-3; GeoB1025-2; GeoB1026-3; GeoB1027-2; GeoB1028-2; GeoB1028-4; GeoB1029-1; GeoB1031-1; GeoB1032-2; GeoB1035-3; GeoB1037-1; GeoB1039-1; GeoB1040-3; GeoB1041-1; GeoB1101-4; GeoB1102-3; GeoB1103-3; GeoB1104-5; GeoB1105-3; GeoB1106-5; GeoB1108-6; GeoB1109-4; GeoB1110-3; GeoB1111-5; GeoB1112-3; GeoB1114-3; GeoB1115-4; GeoB1116-1; GeoB1117-3; GeoB1118-2; GeoB1120-3; GeoB1203-2; GeoB1204-3; GeoB1207-2; GeoB1208-1; GeoB1209-1; GeoB1210-3; GeoB1211-1; GeoB1212-2; GeoB1214-2; GeoB1215-1; GeoB1216-2; GeoB1217-1; GeoB1218-1; GeoB1401-1; GeoB1403-2; GeoB1405-7; GeoB1407-7; GeoB1413-2; GeoB1414-2; GeoB1417-2; GeoB1418-1; GeoB1420-1; GeoB1607-8; GeoB1608-9; GeoB1609-9; GeoB1612-9; GeoB1613-10; GeoB1702-6; GeoB1703-5; GeoB1704-1; GeoB1705-2; GeoB1706-1; GeoB1707-2; GeoB1709-3; GeoB1710-2; GeoB1711-5; GeoB1712-2; GeoB1713-6; GeoB1714-1; GeoB1715-1; GeoB1716-2; GeoB1717-2; GeoB1718-1; GeoB1719-5; GeoB1720-4; GeoB1721-4; GeoB1722-3; GeoB1724-4; GeoB1726-2; GeoB1901-1; GeoB1902-3; GeoB1903-1; GeoB1904-1; GeoB1905-1; GeoB1906-1; GeoB1907-1; GeoB1908-1; GeoB2001-1; GeoB2007-1; GeoB2008-1; GeoB2009-1; GeoB2010-1; GeoB2011-1; GeoB2016-3; GeoB2019-2; GeoB2021-4; GeoB2301-1; GeoB2302-1; GeoB2303-1; GeoB2304-1; GeoB2305-1; GeoB2306-1; GeoB2307-1; GeoB2308-1; GeoB2309-1; GeoB2310-1; GeoB3602-2; GeoB3603-1; GeoB3604-4; GeoB3605-1; GeoB3606-2; GeoB3607-1; GeoB3608-1; Geosciences, University of Bremen; Giant box corer; GIK17836-1; GIK17843-1; GIK17851-1; GIK17862-1; GIK17866-1; GIK17884-1; GIK17912-1; GKG; Guinea Basin; Indian-Antarctic Ridge; Kongo delta; LATITUDE; LONGITUDE; M12/1; M16/1; M20/1; M20/2; M23/1; M34/1; M6/6; M9/4; Meteor (1986); Meteor Rise; MIC; Mid Atlantic Ridge; MiniCorer; MUC; MultiCorer; Namibia Continental Margin; Northern Cape Basin; Northern Guinea Basin; off Kunene; Polarstern; PROBOSWA; PS16; PS16/262; PS16/267; PS16/271; PS16/284; PS16/294; PS16/303; PS16/311; PS16/316; PS16/321; PS16/334; PS16/337; PS16/342; PS16/345; PS16/351; PS16/362; PS1750-7; PS1751-2; PS1752-5; PS1756-6; PS1759-1; PS1764-2; PS1768-1; PS1771-4; PS1772-6; PS1775-5; PS1776-6; PS1777-7; PS1778-1; PS1779-3; PS1782-6; PS2489-4; PS2491-5; PS2492-1; PS2493-3; PS2494-1; PS2495-1; PS2496-2; PS2498-2; PS2499-1; PS2500-7; PS28; PS28/256; PS28/264; PS28/277; PS28/280; PS28/289; PS28/293; PS28/298; PS28/304; PS28/314; PS28/316; Romanche fracture zone; Sea surface temperature, annual mean; Sea surface temperature, production weighted; SFB261; Shona Ridge; SO84; SO86; Sonne; South African margin; South Atlantic; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Southern Cape Basin; South Sandwich Basin; Southwest Guinea Basin; ST. HELENA HOTSPOT; Van Heesen Ridge; Walvis Ridge; West Angola Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 447 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
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    Total organic carbon, alkenones and sea surface temperature of sediment core GeoB1710-3 (2001)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Alkenone, unsaturation index UK'37; Calculated from C37 alkenones (Prahl & Wakeham, 1987); Calculated from UK'37 (Prahl et al., 1988); Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN; Gas chromatography; GeoB; GeoB1710-3; Geosciences, University of Bremen; Gravity corer (Kiel type); Heptatriaconta-15E,22E-dien-2-one; Heptatriaconta-8E,15E,22E-trien-2-one; M20/2; Meteor (1986); Namibia continental slope; Sea surface temperature, annual mean; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
    Materialart: Dataset
    Format: text/tab-separated-values, 1060 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
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    Paleotemperatures, stable isotopes and alkenones in sediment core GeoB1016-3 (1999)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Alkenone, Ep; Alkenone, δ13C; Alkenone, δ13C, standard deviation; Angola Basin; Calculated; Calculated from UK'37 (Prahl et al., 1988); Carbon dioxide, partial pressure; DEPTH, sediment/rock; Gas chromatography; GeoB; GeoB1016-3; Geosciences, University of Bremen; Globigerinoides ruber pink, δ13C; Gravity corer (Kiel type); Isotope ratio mass spectrometry; M6/6; Mass spectrometer Finnigan MAT 251; Mass spectrometer Finnigan MAT 252; Meteor (1986); Number of observations; Sea surface temperature, annual mean; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; δ15N, gas
    Materialart: Dataset
    Format: text/tab-separated-values, 260 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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