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  • PANGAEA  (21)
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  • 1
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    PANGAEA
    In:  Supplement to: Rafter, Patrick A; Herguera, Juan-Carlos; Southon, John R (2018): Extreme lowering of deglacial seawater radiocarbon recorded by both epifaunal and infaunal benthic foraminifera in a wood-dated sediment core. Climate of the Past, 14(12), 1977-1989, https://doi.org/10.5194/cp-14-1977-2018
    Publication Date: 2023-01-13
    Description: For over a decade, oceanographers have debated the interpretation and reliability of sediment microfossil records indicating extremely low seawater radiocarbon (14C) during the last deglaciation-observations that suggest a major disruption in marine carbon cycling coincident with rising atmospheric CO2 concentrations. Possible flaws in these records include poor age model controls, utilization of mixed, infaunal foraminifera species possibly influenced by changing porewater chemistry, and bioturbation. We have addressed these concerns using a glacial-interglacial record of epifaunal benthic foraminifera 14C on an ideal sedimentary age model (wood calibrated to atmosphere 14C). Our results affirm – with important caveats – the fidelity of these microfossil archives and confirm previous observations of highly depleted seawater 14C at intermediate depths in the deglacial northeast Pacific
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
    Publication Date: 2023-02-07
    Keywords: Age, 14C; Age, 14C calibrated, CALIB 7.1 (Stuiver et al. 2017); Age, dated; Age, dated material; Age, dated standard error; Analytical method; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Comment; Core; CORE; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; ET97-7T; Gulf of California; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 310 data points
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  • 3
    Publication Date: 2023-02-07
    Keywords: Age, 14C; Age, dated; Age, dated material; Age, dated standard error; Core; CORE; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Gulf of California; LPAZ-21PG; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 4
    Publication Date: 2023-02-08
    Keywords: Age, dated; Age, dated material; Age, dated standard error; Comment; Core; CORE; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Gulf of California; LPAZ-21P; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 923 data points
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  • 5
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    PANGAEA
    In:  Supplement to: De Pol-Holz, Ricardo; Keigwin, Lloyd D; Southon, John R; Hebbeln, Dierk; Mohtadi, Mahyar (2010): No signature of abyssal carbon in intermediate waters off Chile during deglaciaition. Nature Geoscience, 3(3), 192-195, https://doi.org/10.1038/ngeo745
    Publication Date: 2023-06-27
    Description: At the end of the Last Glacial Maximum (19,000 to 11,000 years ago), atmospheric carbon dioxide concentrations rose while the Delta14C of atmospheric carbon dioxide declined**1, 2. These changes have been attributed to an injection of carbon dioxide with low radiocarbon activity from an oceanic abyssal reservoir that was isolated from the atmosphere for several thousand years before deglaciation**3. The current understanding points to the Southern Ocean as the main area of exchange between these reservoirs4. Intermediate water formed in the Southern Ocean surrounding Antarctica would have then carried the old carbon dioxide signature to the lower-latitude oceans**5, 6. Here we reconstruct the Delta14C signature of Antarctic Intermediate Water off the coast of Chile for the past 20,000 years, using paired 14C ages of benthic and planktonic foraminifera. In contrast to the above scenario, we find that the delta14C signature of the Antarctic Intermediate Water closely matches the modelled surface ocean Delta14C, precluding the influence of an old carbon source. We suggest that if the abyssal ocean is indeed the source of the radiocarbon-depleted carbon dioxide, an alternative path for the mixing and propagation of its carbon dioxide may be required to explain the observed changes in atmospheric carbon dioxide concentration and radiocarbon activity.
    Keywords: Age, 14C AMS; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Gravity corer (Kiel type); MARUM; Sample code/label; SL; SO161/5; SO161/5_22SL; Sonne; SPOC; Taxon/taxa; Δ14C
    Type: Dataset
    Format: text/tab-separated-values, 209 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Ku, Teh-Lung; Southon, John R; Vogel, John S; Liang, Z C; Kusakabe, M; Nelson, D Erle (1985): 10Be distributions in Deep Sea Drilling Project Site 576 and Site 578 sediments studied by accelerator mass spectrometry. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 539-546, https://doi.org/10.2973/dsdp.proc.86.122.1985
    Publication Date: 2023-06-27
    Description: Extension of the 10Be geochronology for deep-sea sediments beyond the limit of late Pliocene age found in published works has been attempted. The results obtained on sediments from Deep Sea Drilling Project (DSDP) Sites 576 and 578 of Leg 86 suggest the feasibility of dating sediments as old as 12 to 15 m.y. At both sites, there have been large changes in sedimentation rate, with the Pleistocene sediments accumulating several times faster than those of the Pliocene, which in turn were deposited several times more rapidly than the late Miocene sediments. The Pleistocene-Pliocene section is considerably thicker in Hole 578 than in Hole 576B: the respective depths for the 7 m.y. time boundary in the two holes are about 125 and about 25 m. These 10Be-based age estimates are in agreement with the paleomagnetic stratigraphies established for the two sites. The suggested enhancement in the oceanic deposition of 10Be before 7 to 9 m.y. ago, as noticed in manganese crusts, has found tentative support from the present sedimentary records. A preliminary search for 10Be production variation during a geomagnetic field reversal has been conducted. In Hole 578, an enhanced 10Be concentration is found in a sample close to the Brunhes/Matuyama reversal boundary. More detailed and systematic measurements are required to confirm this observation, which bears on the detailed behavior of the geomagnetic field during the reversal.
    Keywords: 86-576; 86-576B; 86-578; Atomic absorption spectrometry (AAS); Beryllium-10; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9, standard deviation; Beryllium-10/Beryllium-9 ratio; Calcium carbonate; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg86; North Pacific; Sample code/label; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 201 data points
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  • 7
    Publication Date: 2023-08-28
    Description: Attempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source.
    Keywords: 262GBHF; Alpha spectrometry; Deposit type; DEPTH, sediment/rock; Distance; Distance, maximum; Distance, minimum; Dredge, box; DRG_B; Elevation of event; growth; Identification; Iron; Latitude of event; Longitude of event; Manganese; manganese nodules; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Peru Basin, Pacific Ocean; SO11; SO11_262DK; Sonne; SOPAC II; Thorium-227; Thorium-227, standard deviation; Thorium-227 excess/Thorium-230 excess activity ratio; Thorium-227 excess/Thorium-230 excess activity ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230 excess/Thorium-232 activity ratio; Thorium-230 excess/Thorium-232 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 243 data points
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  • 8
    Publication Date: 2023-08-28
    Description: Attempts have been made to study the entire growth history of a manganese nodule from the northern part of Peru Basin in the Pacific using radiochemical profiles of 230Th232Th, 227Th230Th, and 10Be9Be. Combined with the observations on Fe-Mn contents and textural variation, the radiochemical data indicate that the nodule grew more or less concentrically throughout most of its existence since it formed 1.5 my ago, receiving Mn from both bottom water and pore water. This condition appeared to have changed about 180 ky ago when the growth became asymmetric in that the top and bottom sides became fixed in their relative positions on the sea floor. Since then, the bottom side accreted with a fast rate of close to 200 mm/my, apparently fueled by the supply of diagenetically remobilized Mn in pore water from the sediment substrate. In the meantime, the top side accumulated at about 6 mm/my, a value which is in the normal range for deep-sea nodules having their Mn supplied from the hydrogenous source.
    Keywords: 262GBHF; Atomic absorption spectrometry (AAS); Beryllium-10; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9; Beryllium-10/Beryllium-9, standard deviation; Beryllium-9; Beryllium-9, standard deviation; Deposit type; DEPTH, sediment/rock; Distance; Distance, maximum; Distance, minimum; Dredge, box; DRG_B; Elevation of event; growth; Identification; Iron; Latitude of event; Longitude of event; Manganese; manganese nodules; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Peru Basin, Pacific Ocean; SO11; SO11_262DK; Sonne; SOPAC II
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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  • 9
    Publication Date: 2023-10-20
    Keywords: Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; EISPAC/WESTWIND; GC; GeoB17426-3; Gravity corer; Laboratory code/label; Method comment; SO228; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 92 data points
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  • 10
    Publication Date: 2023-10-20
    Keywords: 250-355 µm fraction; 355-425 µm fraction; AGE; Center for Marine Environmental Sciences; DEPTH, sediment/rock; EISPAC/WESTWIND; GC; GeoB17426-3; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Gravity corer; MARUM; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; SO228; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 954 data points
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