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  • 1
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    Paleotemperature and productivity reconstruction of sediment core D11957P on the Iberian Margin
    PANGAEA
    In:  Supplement to: Lebreiro, Susana Martin; Moreno, J C; Abrantes, Fatima F; Pflaumann, Uwe (1997): Productivity and paleoceanographic implications on the Tore Seamount (Iberian Margin) during the last 225 kyr: Foraminiferal evidence. Paleoceanography, 12(5), 718-727, https://doi.org/10.1029/97PA01748
    Details
    Publication Date: 2023-06-27
    Description: Foraminifera counts and climatic assemblages from the Tore Seamount are used to approach the glacial and interglacial changes in temperature and productivity on the Iberian Margin over the last 225 kyr. Chronostratigraphy is based on Globigerinoides ruber and Globigerina bulloides oxygen isotopes and supported by foraminifera and carbonate stadial fluctuations. Foraminifera indicate cooling from late interglacial stage 5 to the beginning of Termination I (TI). Neogloboquadnna pachyderma-s reflects cold conditions during glacial stages 4-2. In contrast, glacial stage 6 is dominated by warmer N. pachyderma-d and dutertrei and a restricted arctic assemblage. Past sea surface temperatures confirm the general cooling, reaching 4.3°C (SIMMAX.28) during stage 2. Multiple productivity proxies such as organic carbon, productivity-related foraminifera, and delta13C constrain the changes observed. A productivity increase occurs after interglacial stage 5, enhanced from late glacial stage 3 to TI Present-day satellite-detected phytoplankton plumes off Portugal would have accounted in the past glacial stages for the general productivity increase over the Tore. On top of this, welldefined peaks of organic carbon and productivity-related foraminifera correspond with Heinrich events 1-4.
    Keywords: D11957P; D187; Discovery (1962); PC; Piston corer
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 2
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    (Table 1) Sedimentology of core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Clay, mass netto; Counting 〉125 µm fraction; Counting 〉63 µm fraction; D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Foraminifera, benthic; Foraminifera, planktic indeterminata; Grain size, sieving/settling tube; PC; Piston corer; Sand; Sand, mass netto; Silt; Silt, mass netto; Size fraction 〈 0.002 mm, clay; Uvigerina sp.
    Type: Dataset
    Format: text/tab-separated-values, 675 data points
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  • 3
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    (Table 4) Calcium carbonate and total organic carbon content of sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Calcium carbonate; Carbon, organic, total; D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Element analyser CNS, Carlo Erba NA1500; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 184 data points
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  • 4
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    (Table 5) Stable isotopes of planktonic foraminifera from sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Globigerina bulloides, δ13C; Globigerina bulloides, δ18O; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; Mass spectrometer VG SIRA 24; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 250 data points
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  • 5
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    (Fig. 3) Age model of sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age model; Age model, SPECMAP chronology, Imbrie et al. (1984); D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Isotopic event; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
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  • 6
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    (Table 2) Distribution of planktic foraminifers of sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Counting 〉150 µm fraction; D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Foraminifera, planktic indeterminata; Globigerina bulloides; Globigerina calida; Globigerina digitata; Globigerina falconensis; Globigerina quinqueloba; Globigerina rubescens; Globigerinella siphonifera; Globigerinita glutinata; Globigerinita iota; Globigerinita uvula; Globigerinoides conglobatus; Globigerinoides quadrilobatus; Globigerinoides ruber white; Globigerinoides sacculifer; Globigerinoides tenellus; Globigerinoides trilobus trilobus; Globorotalia crassaformis; Globorotalia hirsuta; Globorotalia inflata; Globorotalia scitula; Globorotalia truncatulinoides dextral; Globorotalia truncatulinoides sinistral; Neogloboquadrina dutertrei; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma dextral and dutertrei integrade; Neogloboquadrina pachyderma sinistral; Orbulina bilobata; Orbulina suturalis; Orbulina universa; PC; Piston corer; Pulleniatina obliquiloculata; Turborotalita cristata; Turborotalita humilis
    Type: Dataset
    Format: text/tab-separated-values, 2475 data points
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  • 7
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    (Table 3) Calculated sea surface temperature and paleoproductivity of sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Communality; D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Factor 1; Factor 2; Factor 3; Factor 4; Factor 5; Factor 6; Modern analog technique (MAT), SIMMAX28; Paleoproductivity, as carbon, standard deviation; Paleoproductivity, maximum as carbon; Paleoproductivity, minimum as carbon; Paleoproductivity as carbon; PC; Piston corer; Sea surface temperature, summer; Sea surface temperature, summer, standard deviation; Sea surface temperature, summer max; Sea surface temperature, summer min; Sea surface temperature, winter; Sea surface temperature, winter, standard deviation; Sea surface temperature, winter max; Sea surface temperature, winter min; Similarity index; Transfer function FA20, Molfino et al., 1982
    Type: Dataset
    Format: text/tab-separated-values, 1850 data points
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  • 8
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    (Table 2) Comparison between dolomite, calcite and quartz for Heinrich layers and the interlayered intervals of sediment core D11957P
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Calcite/Quartz ratio; Calcite (3.03 Å), relative abundance; Comment; D11957P; D187; DEPTH, sediment/rock; Discovery (1962); Dolomite/quartz ratio; Dolomite (2.88 Å), relative abundance; PC; Piston corer; Quartz (4.26 Å), relative abundance
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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  • 9
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    Mineralogy and age determination of sediment core D11957P
    PANGAEA
    In:  Supplement to: Lebreiro, Susana Martin; Moreno, J C; McCave, I Nick; Weaver, Philip PE (1996): Evidence for Heinrich layers off Portugal (Tore Seamount: 39°N, 12°W). Marine Geology, 131(1-2), 47-56, https://doi.org/10.1016/0025-3227(95)00142-5
    Details
    Publication Date: 2023-06-27
    Description: The Tore Seamount is a circular, volcano-like feature 100 km in diameter with its summit at 2200 m water depth and a small, 5000 m deep basin in its interior. It is situated approximately 300 km west of Lisbon and is surrounded by deep abyssal plains. This site with a standard pelagic stratigraphy is the southernmost point where the so-called Heinrich events have so far been recorded. A succession of alternating interglacial/glacial periods reveals a stratigraphic record back to the beginning of isotopic stage 7 (225 kyr). Climatic changes are identifiable by coherent variations in colour, carbonate content and distribution of ice-rafted detritus in the carbonate-free fraction. Inputs of ice-rafted quartz are well defined. Characteristics in common with other sites showing Heinrich layers include a high terrigenous to biogenic ratio, a dramatic decrease in the accumulation rate of foraminifera shells, an increase in dolomite abundance and the occurrence of polar foraminiferal species indicating southwards penetration of cold waters which lead us to consider a wider southeastern extent of the North Atlantic ice-rafted detritus belt than hitherto. If the presently accepted position of the Polar Front is maintained, icebergs must have been swept southwards from the southern boundary of the pack ice in a current merging into the ancestral Canary Current, bringing ice-rafted material to the Tore Seamount. The coincidence of reddish-feldspar, probably derived from the northern Appalachian Triassic red facies, with the transparent quartz suggests at least a partial Labrador source for all the Heinrich layers here, including HL 3. In comparison to other sites in the entire North Atlantic, two exceptions stand out: the absence of HL 5 and the low detritus to biogenics ratio for HL 3. The simultaneous occurrence of these two types of ice-rafted minerals is a new piece in the puzzle of the origin of Heinrich layers.
    Keywords: D11957P; D187; Discovery (1962); PC; Piston corer
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
    Electronic Resource
    Electronic Resource
    A spectroscopic study using line ratios of lithiumlike ions in a laser-produced plasma (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1460-1464 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectra of highly ionized titanium and calcium in the extreme ultraviolet region were observed in laser-produced plasmas using the OMEGA 24 beam (351 nm) laser system at the University of Rochester. The plasmas were produced using glass microballoon targets coated with a layer of a medium Z element and a layer of parylene (CH). Time-integrated electron temperatures and densities were obtained by comparing measured line intensity ratios of lithiumlike charge states of Ti and Ca to numerical calculations from a collisional-radiative model. The variation of line intensity ratios with electron density and temperature using the collisional-radiative model is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342959
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    Paper (German National Licenses)
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