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  • 2000-2004  (11)
  • 1990-1994  (1)
Publikationsart
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Terrestrial carbon-isotope records from coastal deposits (Algarve, Portugal): a tool for chemostratigraphic correlation on an intrabasinal and global scale (2003)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 15 (2003), S. 0 
    Details
    ISSN: 1365-3121
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The carbon-isotope signature of terrestrial organic matter (OM) offers a valuable tool to develop stratigraphic correlations for near-shore deposits. A mid-Cretaceous coastal succession of the western Algarve Basin, Portugal, displays a marked negative δ13C excursion ranging from − 21.2‰ to − 27.8‰ in the Early Aptian followed by two shifts towards higher values (up to − 19.3‰) during the Early and Late Aptian, respectively. The dominance of cuticle and leaf debris in the bulk OM fraction is confirmed by optical studies, Rock-Eval pyrolysis and by comparison with the δ13C signature of four different types of fossilized land-plant particles. Correlation of two terrestrial δ13Cbulk OM records from different study sites leads to a significant enhancement of the intrabasinal stratigraphic correlation within the Algarve Basin. Three prominent excursions in the Portuguese records can be correlated with existing δ13C curves from pelagic and terrestrial environments. The general carbon-isotope pattern is superimposed by small-scale fluctuations which can be explained by compositional variations within the OM.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-3121.2003.00447.x
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    A general transposition method for a matrix on auxiliary store (1990)
    Springer
    BIT 30 (1990), S. 2-16 
    Details
    ISSN: 1572-9125
    Schlagwort(e): E.2 ; F.2.1 ; G.4 ; I.1.2 ; Matrix transposition ; mixed radix notation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract An algorithm is developed and described for transposing a matrix larger than available working storage. If an (n×m)-matrix is stored in row-major order, and blocks ofn elements may be transferred to and from working storage at a time, the algorithm needsw=(5[m/n]+8)·n elements to be present in working storage at a time and requires [log2(2mn/w)] passages over the matrix. The algorithm is as efficient as earlier methods but needs no extra backing storage space. An algebra for mixed radix notation and a generalization of mixed radix notation is introduced for the description and verification of transposition algorithms, and earlier algorithms are briefly certified or disproved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01932126
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    facet.materialart.
    Unbekannt
    SST of sediment trap WR2 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-24
    Schlagwort(e): ANT-VII/5; Calculated; Calculated from UK'37 (Prahl et al., 1988); DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; GeoB; Geosciences, University of Bremen; Polarstern; PS14; Sample code/label; Sea surface temperature, annual mean; Trap; TRAP; Walvis Ridge, Southeast Atlantic Ocean; WR2_trap
    Materialart: Dataset
    Format: text/tab-separated-values, 78 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
    facet.materialart.
    Unbekannt
    Biomarker of sediment trap CB2 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2023-11-30
    Schlagwort(e): 24-Ethylcholest-5-en-3beta-ol, flux; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,24(28)-dien-3beta-ol, flux; 24-Methylcholesta-5,24(28)-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, flux; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Alkenone, C37, flux; Alkenone, C37 normalized to total organic carbon; Calculated; Calculated, see reference(s); CB2_trap; Cholesta-5-en-3beta-ol, flux; Cholesta-5-en-3beta-ol, per unit mass total organic carbon; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; GeoB; Geosciences, University of Bremen; M9/4; Meteor (1986); Sample code/label; Trap; TRAP
    Materialart: Dataset
    Format: text/tab-separated-values, 339 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
    facet.materialart.
    Unbekannt
    Biomarker of sediment trap GBN3 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2023-11-30
    Schlagwort(e): 24-Ethylcholest-5-en-3beta-ol, flux; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,24(28)-dien-3beta-ol, flux; 24-Methylcholesta-5,24(28)-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, flux; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Alkenone, C37, flux; Alkenone, C37 normalized to total organic carbon; Calculated; Calculated, see reference(s); Cholesta-5-en-3beta-ol, flux; Cholesta-5-en-3beta-ol, per unit mass total organic carbon; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; GBN3_trap; GeoB; Geosciences, University of Bremen; M9/4; Meteor (1986); Sample code/label; Trap; TRAP
    Materialart: Dataset
    Format: text/tab-separated-values, 311 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
    facet.materialart.
    Unbekannt
    Biomarker of sediment trap WR3 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2023-11-30
    Schlagwort(e): 24-Ethylcholest-5-en-3beta-ol, flux; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,24(28)-dien-3beta-ol, flux; 24-Methylcholesta-5,24(28)-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, flux; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Alkenone, C37, flux; Alkenone, C37 normalized to total organic carbon; Calculated; Calculated, see reference(s); Cholesta-5-en-3beta-ol, flux; Cholesta-5-en-3beta-ol, per unit mass total organic carbon; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; GeoB; Geosciences, University of Bremen; M12/1; Meteor (1986); Sample code/label; Trap; TRAP; Walvis Ridge, Southeast Atlantic Ocean; WR3_trap
    Materialart: Dataset
    Format: text/tab-separated-values, 243 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    Biomarker of sediment trap WR2 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2023-11-30
    Schlagwort(e): 24-Ethylcholest-5-en-3beta-ol, flux; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,24(28)-dien-3beta-ol, flux; 24-Methylcholesta-5,24(28)-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, flux; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Alkenone, C37, flux; Alkenone, C37 normalized to total organic carbon; ANT-VII/5; Calculated; Calculated, see reference(s); Cholesta-5-en-3beta-ol, flux; Cholesta-5-en-3beta-ol, per unit mass total organic carbon; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; Gas chromatography - Mass spectrometry (GC-MS); GeoB; Geosciences, University of Bremen; Polarstern; PS14; Sample code/label; Trap; TRAP; Walvis Ridge, Southeast Atlantic Ocean; WR2_trap
    Materialart: Dataset
    Format: text/tab-separated-values, 468 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
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    Unbekannt
    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
  • 9
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    Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic (2002)
    PANGAEA
    In:  Supplement to: Benthien, Albert; Andersen, Nils; Schulte, Sonja; Müller, Peter J; Schneider, Ralph R; Wefer, Gerold (2002): Carbon isotopic composition of the C37:2 alkenone in core-top sediments of the South Atlantic Ocean: Effects of CO2 and nutrient concentrations. Global Biogeochemical Cycles, 16(1), 1012, https://doi.org/10.1029/2001GB001433
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: We have analyzed the stable carbon isotopic composition of the diunsaturated C37 alkenone in 29 surface sediments from the equatorial and South Atlantic Ocean. Our study area covers different oceanographic settings, including sediments from the major upwelling regions off South Africa, the equatorial upwelling, and the oligotrophic western South Atlantic. In order to examine the environmental influences on the sedimentary record the alkenone-based carbon isotopic fractionation (Ep) values were correlated with the overlying surface water concentrations of aqueous CO2 ([CO2(aq)]), phosphate, and nitrate. We found Ep positively correlated with 1/[CO2(aq)] and negatively correlated with [PO43-] and [NO3-]. However, the relationship between Ep and 1/[CO2(aq)] is opposite of what is expected from a [CO2(aq)] controlled, diffusive uptake model. Instead, our findings support the theory of Bidigare et al. (1997, doi:10.1029/96GB03939) that the isotopic fractionation in haptophytes is related to nutrient-limited growth rates. The relatively high variability of the Ep-[PO4] relationship in regions with low surface water nutrient concentrations indicates that here other environmental factors also affect the isotopic signal. These factors might be variations in other growth-limiting resources such as light intensity or micronutrient concentrations.
    Schlagwort(e): -; Alkenone, Ep; Alkenone, unsaturation index UK37; Alkenone C37:2, δ13C; Amazon Fan; Angola Basin; Brazil Basin; Calculated; Cape Basin; Carbon dioxide, total; DEPTH, sediment/rock; Elevation of event; Equatorial Atlantic; Event label; Gas chromatography; GeoB; GeoB1008-6; GeoB1016-3; GeoB1028-4; GeoB1032-2; GeoB1041-1; GeoB1105-3; GeoB1117-3; GeoB1214-2; GeoB1413-1; GeoB1501-1; GeoB1503-2; GeoB1505-3; GeoB1508-1; GeoB1515-2; GeoB1703-5; GeoB1706-1; GeoB1710-2; GeoB1711-5; GeoB1712-2; GeoB1713-6; GeoB1719-5; GeoB1903-1; GeoB2102-1; GeoB2109-3; GeoB2125-2; GeoB2204-1; GeoB2215-8; GeoB3117-3; GeoB3603-1; Geosciences, University of Bremen; Giant box corer; GIK17843-1; GKG; Gravity corer (Kiel type); JOPSII-6; Latitude of event; Longitude of event; M12/1; M16/1; M16/2; M20/2; M23/2; M23/3; M34/1; M6/6; M9/4; Mass spectrometer Finnigan MAT 252; Meteor (1986); Mid Atlantic Ridge; MUC; MultiCorer; Namibia Continental Margin; NE-Brazilian continental margin; Nitrate; off Kunene; Phosphate; Sea surface temperature, annual mean; SL; SO84; Sonne; Southern Cape Basin; ST. HELENA HOTSPOT; Victor Hensen; Walvis Ridge; West Angola Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 249 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 10
    facet.materialart.
    Unbekannt
    Biomarker of sediment core GeoB1602-7 (2003)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): 24-Ethylcholest-5-en-3beta-ol, flux; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, flux; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Alkenone, C37, flux; Alkenone, C37 normalized to total organic carbon; Calculated; Calculated, see reference(s); Cholesta-5-en-3beta-ol, flux; Cholesta-5-en-3beta-ol, per unit mass total organic carbon; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GeoB; GeoB1602-7; Geosciences, University of Bremen; M20/1; Meteor (1986); MUC; MultiCorer; off Cape Blanc
    Materialart: Dataset
    Format: text/tab-separated-values, 90 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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