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  • 2020-2024  (13)
  • 2021  (13)
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  • 1
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    A global climatology of the ocean surface during the Last Glacial Maximum mapped on a regular grid (GLOMAP) (2021)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2024-02-07
    Description: We present a climatology of the near-sea-surface temperature (NSST) anomaly and the sea-ice extent during the Last Glacial Maximum (LGM, 23 000–19 000 years before present) mapped on a global regular 1∘×1∘ grid. It is an extension of the Glacial Atlantic Ocean Mapping (GLAMAP) reconstruction of the Atlantic NSST based on the faunal and floral assemblage data of the Multiproxy Approach for the Reconstruction of the Glacial Ocean Surface (MARGO) project and several recent estimates of the LGM sea-ice extent. Such a gridded climatology is highly useful for the visualization of the LGM climate, calculation of global and regional NSST averages, and estimation of the equilibrium climate sensitivity, as well as a boundary condition for atmospheric general circulation models. The gridding of the sparse NSST reconstruction was done in an optimal way using the Data-Interpolating Variational Analysis (DIVA) software, which takes into account the uncertainty in the reconstruction and includes the calculation of an error field. The resulting Glacial Ocean Map (GLOMAP) confirms the previous findings by the MARGO project regarding longitudinal and meridional NSST differences that were greater than today in all oceans. Taken at face value, the estimated global and tropical cooling would imply an equilibrium climate sensitivity at the lower end of the currently accepted range. However, because of anticipated changes in the seasonality and thermal structure of the upper ocean during the LGM as well as uneven spatial sampling, the estimated cooling and implied climate sensitivity are likely to be biased towards lower values.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene (2021)
    Elsvier
    Details
    Publication Date: 2024-02-07
    Description: Highlights • First granulometric record of Holocene Atlantic water inflow into Labrador Sea. • Good temporal correlation with North Atlantic current speeds and AMOC. • Highest current speeds in the early Holocene, lowest during the Neoglaciation. • Distinction between Atlantic water inflow and influence crucial for paleo-studies. • Local ice sheet advances in SW Greenland during “8.2”-event and Neoglaciation. Abstract The hydrodynamics of the Labrador Sea, controlled by the complex interplay of oceanographic, atmospheric and ice-sheet processes, play a crucial role for the Atlantic Meridional Overturning Circulation (AMOC). An improved understanding of the hydrodynamics and its forcing in the past could therefore hold a key to understanding its future behaviour. At present, there is a remarkable temporal mismatch, in that the largely microfossil-based reconstructions of Holocene Atlantic-water inflow/influence in the Labrador Sea and Baffin Bay appear to lag grain size-based current strength reconstructions from the adjacent North Atlantic by 〉 2ka. Here, we present the first current strength record from the West Greenland shelf off Nuuk to reconstruct Atlantic Water (AW)-inflow to the Labrador Sea via the West Greenland Current. Our data show that the Holocene AW-inflow into Labrador Sea is well aligned with the Holocene Speed Maximum documented in the North Atlantic (McCave and Andrews, 2019; Quat. Sci. Rev. 223), suggesting a close coupling with the AMOC. The observed lag between the microfossil-based records and the Holocene Speed Maximum can be explained when considering the presence of an extended meltwater lens that prevented the shoaling of the inflowing Atlantic waters. Once the meltwater discharge waned after the cessation of large-scale melting of the surrounding ice sheets, the AW could influence the surface waters, independently of the strength of its inflow. Only then was an effective ocean-atmosphere heat transfer enabled, triggering the comparably late onset of the regional Holocene Thermal Maximum. Furthermore, sediment geochemical analyses show that short term cooling events, such as the 8.2 ka event related to the final drainage of glacial Lake Agassiz, lead to glacier advances of the Greenland Ice Sheet. Since the grain size data show that these events had no influence on the AW-inflow to the north eastern Labrador Sea, these advances must have been caused by atmospheric cooling. Consequently, we argue that (i) in this region, surface water-based proxies register AW influence rather than inflow (ii) the AW inflow into the Labrador Sea is controlled by the AMOC, but (iii) its impact on an effective ocean-atmosphere heat transfer was hindered by a prevailing meltwater lens in the early Holocene, i.e. until the cessation of large-scale melting of the surrounding ice sheets.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Documentation of sediment core PS115/2_51-3 (2021)
    PANGAEA
    In:  Alfred Wegener Institute - Polarstern core repository
    Details
    Publication Date: 2023-03-16
    Keywords: Arctic Ocean; AWI_Paleo; BC; Box corer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS115/2; PS115/2_51-3
    Type: Dataset
    Format: unknown
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    DATA PANGAEA
  • 4
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    U-Series isotopes analytical results (U & Th) on core PS2757-6 (MUC) (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Core PS2757-6 was retrieved with a multicorer (MUC) on the Lomonosov Ridge next to the Russian continental shelf during the Polarstern expedition ARK-XI/1 in 1995. This expedition had the principal aim to study material fluxes and ecological connections between the Arctic Deep Basins and the adjacent Siberian shelf seas, the northern Laptev Sea and the northeastern Kara Sea. In 2018 and 2019, this core had samples analyzed by MC-ICPMS at the Geotop-UQAM laboratories for uranium-series isotopes with the aim to establish radiochronological age constraints for the coring location.
    Keywords: 230Thxs; Arctic Ocean; ARK-XI/1; Depth, bottom/max; Depth, top/min; Lomonosov Ridge; MUC; Multi-collector ICP-MS (MC-ICP-MS), Nu Plasma II; MultiCorer; Polarstern; PS2757-6; PS36; PS36/052; Quaternary; Thorium-230; Thorium-230, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, 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; Uranium-238; Uranium-238, standard deviation; Uranium-238/Thorium-232 activity ratio; Uranium-238/Thorium-232 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 176 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    U-Series isotopes analytical results (U & Th) on core PS2757-8 (KAL) (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: Core PS2757-8 was taken with a Kastenlot corer (KAL) on the Lomonosov Ridge next to the Russian continental shelf during the Polarstern expedition ARK-XI/1 in 1995. This expedition had the principal aim to study material fluxes and ecological connections between the Arctic Deep Basins and the adjacent Siberian shelf seas, the northern Laptev Sea and the northeastern Kara Sea. In 2018 and 2019, the core had samples analyzed by MC-ICPMS at the Geotop-UQAM laboratories for uranium-series isotopes with the aim to establish radiochronological age constraints for the coring locations.
    Keywords: 230Thxs; Arctic Ocean; ARK-XI/1; Depth, bottom/max; Depth, top/min; KAL; Kasten corer; Lomonosov Ridge; Multi-collector ICP-MS (MC-ICP-MS), Nu Plasma II; Polarstern; PS2757-8; PS36; PS36/052; Quaternary; Thorium-230; Thorium-230, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, 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; Uranium-238; Uranium-238, standard deviation; Uranium-238/Thorium-232 activity ratio; Uranium-238/Thorium-232 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 814 data points
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    DATA PANGAEA
  • 6
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    The biomarker and bulk parameters of two sediment cores along Baffin Bay-Labrador Sea north-south transect during the Holocene (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-03
    Description: Holocene sea ice and palaeoenvironmental conditions were reconstructed using three sediment cores from northeastern Baffin Bay (GeoB19948-3 and GeoB19927-3) and the Labrador Sea (GeoB19905-1) along a north-south transect based on sea ice IP25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III). In Baffin Bay, sea-surface conditions in the Early Holocene were characterized by extended (early) spring sea ice cover (SIC) prior to 7.6 ka BP. The conditions in the NE Labrador Sea, however, remained predominantly ice-free in spring/autumn due to the enhanced influx of Atlantic Water (i.e., WGC; West Greenland Current) from 11.5 to ~9.1 ka BP, succeeded by a period of continued (spring-autumn) ice-free conditions from 9.1 to 7.6 ka BP corresponding to the onset of Holocene Thermal Maximum (HTM)-like conditions. A transition towards reoccurring ice-edge and significantly reduced SIC conditions in Baffin Bay is evident in the Mid Holocene (~7.6-3 ka BP) probably caused by the variations in the WGC influence associated with the ice melting and can be characterized as HTM-like conditions. These HTM-like conditions are predominantly recorded in the NE Labrador Sea area shown by (spring-autumn) ice-free conditions from 5.9-3 ka BP. In the Late Holocene (last ~3 ka), our combined proxy records from eastern Baffin Bay indicate low in-situ ice-algae production, however, enhanced multi-year (drifted) sea ice in this area was possibly attributed to the increased influx of Polar Water mass influx and may correlate with the Neoglacial cooling. The conditions in the NE Labrador Sea during the last 3 ka, however, continued to remain (spring-autumn) ice-free with decreased biological carbonate production probably linked to decreased WGC strength and/or increased Arctic Water influx, coinciding with the Neoglacial cooling.
    Keywords: ArcTrain; AWI_Paleo; Baffin Bay; HBI III; Holocene; IP25; Labrador Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Biomarker and bulk parameters of sediment core GeoB19948-3 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; Accumulation rate, (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, total organic carbon; AGE; ArcTrain; AWI_Paleo; Baffin Bay; Calcium carbonate; Calculated; Carbon, organic, total; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GC; GeoB19948-3; Gravity corer; HBI III; Holocene; IP25; Labrador Sea; Maria S. Merian; MSM44; MSM44_374-3; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker C25 HBI (Z) triene IP25 index; Phytoplankton biomarker Dinosterol IP25 index; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 819 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Biomarker and bulk parameters of sediment core GeoB19905-1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, total organic carbon; AGE; ArcTrain; AWI_Paleo; Baffin Bay; Calcium carbonate; Calculated; Carbon, organic, total; Davis Strait; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GC; GeoB19905-1; Gravity corer; HBI III; Holocene; IP25; Labrador Sea; Maria S. Merian; MSM44; MSM44_331-1; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 1554 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Grain-size distribution of sediment core GeoB19905-1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: The disintegrated, inorganic grain-size distribution of sediment core GeoB19905-1 was determined every ten centimetres (and in parts higher resolution) to decipher patterns of sediment input to and transport on the southern west Greenland shelf. Prior to measurement, organic matter, calcium carbonate and biogenic silica were chemically removed from the bulk sediment. Measurements were then performed using a Beckman Coulter Laser Diffraction Particle Size Analyzer LS 13320.
    Keywords: 8.2 ka event; ArcTrain; Beckman Coulter Laser diffraction particle size analyzer LS 13 320; Center for Marine Environmental Sciences; Davis Strait; DEPTH, sediment/rock; GC; GeoB19905-1; Gravity corer; Labrador Sea; Maria S. Merian; MARUM; MSM44; MSM44_331-1; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sample code/label; Size fraction 0.044-0.04 µm; Size fraction 0.048-0.044 µm; Size fraction 0.053-0.048 µm; Size fraction 0.058-0.053 µm; Size fraction 0.064-0.058 µm; Size fraction 0.07-0.064 µm; Size fraction 0.077-0.07 µm; Size fraction 0.084-0.077 µm; Size fraction 0.093-0.084 µm; Size fraction 0.102-0.093 µm; Size fraction 0.112-0.102 µm; Size fraction 0.123-0.112 µm; Size fraction 0.134-0.123 µm; Size fraction 0.148-0.134 µm; Size fraction 0.162-0.148 µm; Size fraction 0.178-0.162 µm; Size fraction 0.195-0.178 µm; Size fraction 0.214-0.195 µm; Size fraction 0.235-0.214 µm; Size fraction 0.258-0.235 µm; Size fraction 0.284-0.258 µm; Size fraction 0.311-0.284 µm; Size fraction 0.342-0.311 µm; Size fraction 0.375-0.342 µm; Size fraction 0.412-0.375 µm; Size fraction 0.452-0.412 µm; Size fraction 0.496-0.452 µm; Size fraction 0.545-0.496 µm; Size fraction 0.598-0.545 µm; Size fraction 0.657-0.598 µm; Size fraction 0.721-0.657 µm; Size fraction 0.791-0.721 µm; Size fraction 0.869-0.791 µm; Size fraction 0.953-0.869 µm; Size fraction 1.047-0.954 µm; Size fraction 1.149-1.047 µm; Size fraction 1.261-1.149 µm; Size fraction 1.385-1.261 µm; Size fraction 1.520-1.385 µm; Size fraction 1.669-1.520 µm; Size fraction 1.832-1.669 µm; Size fraction 10.78-9.819 µm; Size fraction 101.1-92.1 µm; Size fraction 1041-948.3 µm; Size fraction 11.83-10.78 µm; Size fraction 111-101.1 µm; Size fraction 1143-1041 µm; Size fraction 12.99-11.83 µm; Size fraction 121.8-111 µm; Size fraction 1255-1143 µm; Size fraction 133.7-121.8 µm; Size fraction 1377-1255 µm; Size fraction 14.26-12.99 µm; Size fraction 146.8-133.7 µm; Size fraction 15.65-14.26 µm; Size fraction 1512-1377 µm; Size fraction 161.2-146.8 µm; Size fraction 1660-1512 µm; Size fraction 17.18-15.65 µm; Size fraction 176.9-161.2 µm; Size fraction 18.86-17.18 µm; Size fraction 1822-1660 µm; Size fraction 194.2-176.9 µm; Size fraction 2.000-1.822 mm; Size fraction 2.010-1.832 µm; Size fraction 2.208-2.011 µm; Size fraction 2.423-2.208 µm; Size fraction 2.66-2.423 µm; Size fraction 2.92-2.66 µm; Size fraction 20.70-18.86 µm; Size fraction 213.2-194.2 µm; Size fraction 22.73-20.70 µm; Size fraction 234.1-213.2 µm; Size fraction 24.95-22.73 µm; Size fraction 256.9-234.1 µm; Size fraction 27.38-24.95 µm; Size fraction 282.1-256.9 µm; Size fraction 3.206-2.920 µm; Size fraction 3.519-3.206 µm; Size fraction 3.862-3.519 µm; Size fraction 30.07-27.38 µm; Size fraction 309.6-282.1 µm; Size fraction 33.01-30.07 µm; Size fraction 339.9-309.6 µm; Size fraction 36.24-33.01 µm; Size fraction 373.1-339.9 µm; Size fraction 39.77-36.24 µm; Size fraction 4.241-3.862 µm; Size fraction 4.656-4.241 µm; Size fraction 409.6-373.1 µm; Size fraction 43.67-39.78 µm; Size fraction 449.7-409.6 µm; Size fraction 47.94-43.67 µm; Size fraction 493.6-449.7 µm; Size fraction 5.111-4.656 µm; Size fraction 5.611-5.111 µm; Size fraction 52.63-47.94 µm; Size fraction 541.9-493.6 µm; Size fraction 57.77-52.63 µm; Size fraction 594.9-541.9 µm; Size fraction 6.159-5.611 µm; Size fraction 6.761-6.159 µm; Size fraction 63.42-57.77 µm; Size fraction 653.0-594.9 µm; Size fraction 69.62-63.42 µm; Size fraction 7.421-6.761 µm; Size fraction 716.9-653.0 µm; Size fraction 76.43-69.62 µm; Size fraction 786.9-716.9 µm; Size fraction 8.148-7.422 µm; Size fraction 8.944-8.147 µm; Size fraction 83.90-76.43 µm; Size fraction 863.9-786.9 µm; Size fraction 9.819-8.944 µm; Size fraction 92.1-83.9 µm; Size fraction 948.2-863.9 µm; sortable silt; West Greenland Current
    Type: Dataset
    Format: text/tab-separated-values, 14742 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Sediment elemental data (XRF) of sediment core GeoB19905-1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: XRF Core Scanner data of sediment core GeoB19905-1 were collected every one to two centimetres downcore over an active area of 15 mm² with a downcore slit size of 10 mm using generator settings of 10 and 30 kV directly at the split core surface of the archive half with XRF Core Scanner II (AVAATECH Serial No. 2) at MARUM, Bremen.
    Keywords: Aluminium, area, total counts; ArcTrain; Bismuth, area, total counts; Bromine, area, total counts; Calcium, area, total counts; Center for Marine Environmental Sciences; Chloride, area, total counts; Chromium, area, total counts; Copper, area, total counts; Davis Strait; DEPTH, sediment/rock; Gallium, area, total counts; GC; GeoB19905-1; Gravity corer; Iron, area, total counts; Labrador Sea; Lead, area, total counts; Manganese, area, total counts; Maria S. Merian; MARUM; Molybdenum, area, total counts; MSM44; MSM44_331-1; Nickel, area, total counts; Niobium, area, total counts; Phosphorus, area, total counts; Potassium, area, total counts; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Rhodium, area, total counts; Rubidium, area, total counts; Silicon, area, total counts; Strontium, area, total counts; Sulfur, area, total counts; Titanium, area, total counts; West Greenland; X-ray fluorescence core scanner (XRF) II, Bremen, (AVAATECH); XRF; Yttrium, area, total counts; Zinc, area, total counts; Zirconium, area, total counts
    Type: Dataset
    Format: text/tab-separated-values, 16050 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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