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  • 145-882; AGE; COMPCORE; Composite Core; Coscinodiscus marginatus; Coscinodiscus radiatus; Diatoms, other; Diatoms, δ18O; DSDP/ODP/IODP sample designation; Joides Resolution; Leg145; Mass spectrometer, Finnigan, MAT 253; North Pacific Ocean; Ocean Drilling Program; ODP; Reference of data; Sample code/label  (1)
  • 145-882A; AGE; Carbon; Coscinodiscus marginatus; Coscinodiscus radiatus; DEPTH, sediment/rock; Diatoms, other; Diatoms, δ18O; Diatoms, δ30Si; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, Costech and Optima mass spectrometer; Joides Resolution; Leg145; Mass spectrometer, Finnigan, MAT 253; North Pacific Ocean; Ocean Drilling Program; ODP; Reference/source; Sample code/label; δ13C, diatom-bound organic matter  (1)
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  • 1
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    Stable oxygen isotope ratios of diatoms and relative species abundances in ODP Site 145-882 (2010)
    PANGAEA
    In:  Supplement to: Swann, George E A (2010): Salinity changes in the North West Pacific Ocean during the late Pliocene/early Quaternary from 2.73 Ma to 2.52 Ma. Earth and Planetary Science Letters, 297(1-2), 332-338, https://doi.org/10.1016/j.epsl.2010.06.035
    Details
    Publication Date: 2024-04-25
    Description: Recent research has increasingly advocated a role for the North Pacific Ocean in modulating global climatic changes over both the last glacial cycle and further back into the geological record. Here a diatom d18O record is presented from Ocean Drilling Program Site 882 over the Pliocene/Quaternary boundary from 2.73 Ma to 2.52 Ma (MIS G6–MIS 99). Large changes in d18Odiatom of c. 4 per mil from 2.73 Ma onwards are documented to occur on a timeframe broadly coinciding with glacial–interglacial cycles. These changes are primarily attributed to large scale inputs of meltwater from glacials surrounding the North Pacific Basin and the Bering Sea. Despite these inputs and associated change in surface water salinity, on the basis of existing opal and UK37 temperature data and new modelled water column densities, no evidence exists to suggests a removal of the halocline stratification or a resumption of the high productivity system similar to that which prevailed prior to 2.73 Ma. The permanence of the halocline suggests that the region played a key role in driving global climatic changes over the early glacial–interglacial cycles that followed the onset of major Northern Hemisphere Glaciation by inhibiting deep water upwelling and ventilation of CO2 to the atmosphere.
    Keywords: 145-882; AGE; COMPCORE; Composite Core; Coscinodiscus marginatus; Coscinodiscus radiatus; Diatoms, other; Diatoms, δ18O; DSDP/ODP/IODP sample designation; Joides Resolution; Leg145; Mass spectrometer, Finnigan, MAT 253; North Pacific Ocean; Ocean Drilling Program; ODP; Reference of data; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 354 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table A1) Diatom isotope measurements from ODP Hole 145-882A (2015)
    PANGAEA
    In:  Supplement to: Swann, George E A; Snelling, Andrea M (2015): Photic zone changes in the north-west Pacific Ocean from MIS 4–5e. Climate of the Past, 11(1), 15-25, https://doi.org/10.5194/cp-11-15-2015
    Details
    Publication Date: 2024-04-25
    Description: In comparison to other sectors of the marine system, the palaeoceanography of the subarctic North Pacific Ocean is poorly constrained. New diatom isotope records of d13C, d18O, d30Si (d13Cdiatom, d18Odiatom, and d30Sidiatom) are presented alongside existing geochemical and isotope records to document changes in photic zone conditions, including nutrient supply and the efficiency of the soft-tissue biological pump, between Marine Isotope Stage (MIS) 4 and MIS 5e. Peaks in opal productivity in MIS 5b/c and MIS 5e are both associated with the breakdown of the regional halocline stratification and increased nutrient supply to the photic zone. Whereas the MIS 5e peak is associated with low rates of nutrient utilisation, the MIS 5b/c peak is associated with significantly higher rates of nutrient utilisation. Both peaks, together with other smaller increases in productivity in MIS 4 and 5a, culminate with a significant increase in freshwater input which strengthens/re-establishes the halocline and limits further upwelling of sub-surface waters to the photic zone. Whilst d30Sidiatom and previously published records of diatom d15N (d15Ndiatom) (Brunelle et al., 2007, 2010) show similar trends until the latter half of MIS 5a, the records become anti-correlated after this juncture and into MIS 4, suggesting a possible change in photic zone state such as may occur with a shift to iron or silicon limitation.
    Keywords: 145-882A; AGE; Carbon; Coscinodiscus marginatus; Coscinodiscus radiatus; DEPTH, sediment/rock; Diatoms, other; Diatoms, δ18O; Diatoms, δ30Si; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, Costech and Optima mass spectrometer; Joides Resolution; Leg145; Mass spectrometer, Finnigan, MAT 253; North Pacific Ocean; Ocean Drilling Program; ODP; Reference/source; Sample code/label; δ13C, diatom-bound organic matter
    Type: Dataset
    Format: text/tab-separated-values, 347 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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