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Maier, Edith; Méheust, Marie; Abelmann, Andrea; Gersonde, Rainer; Chapligin, Bernhard; Ren, Jian; Stein, Ruediger; Meyer, Hanno; Tiedemann, Ralf (2015): Paleoceanography of sediment cores SO202-27-6 and MD01-2416. PANGAEA, https://doi.org/10.1594/PANGAEA.834308, Supplement to: Maier, E et al. (2015): Deglacial subarctic Pacific surface water hydrography and nutrient dynamics and links to North Atlantic climate variability and atmospheric CO2. Paleoceanography, 30(7), 949-968, https://doi.org/10.1002/2014PA002763

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Abstract:
The glacial-to-Holocene evolution of subarctic Pacific surface water stratification and silicic acid (Si) dynamics is investigated based on new combined diatom oxygen (d18Odiat) and silicon (d30Sidiat) isotope records, along with new biogenic opal, subsurface foraminiferal d18O, alkenone-based sea surface temperature, sea ice, diatom, and core logging data from the NE Pacific. Our results suggest that d18Odiat values are primarily influenced by changes in freshwater discharge from the Cordilleran Ice Sheet (CIS), while corresponding d30Sidiat are primarily influenced by changes in Si supply to surface waters. Our data indicate enhanced glacial to mid Heinrich Stadial 1 (HS1) NE Pacific surface water stratification, generally limiting the Si supply to surface waters. However, we suggest that an increase in Si supply during early HS1, when surface waters were still stratified, is linked to increased North Pacific Intermediate Water formation. The coincidence between fresh surface waters during HS1 and enhanced ice-rafted debris sedimentation in the North Atlantic indicates a close link between CIS and Laurentide Ice Sheet dynamics and a dominant atmospheric control on CIS deglaciation. The Bølling/Allerød (B/A) is characterized by destratification in the subarctic Pacific and an increased supply of saline, Si-rich waters to surface waters. This change toward increased convection occurred prior to the Bølling warming and is likely triggered by a switch to sea ice-free conditions during late HS1. Our results furthermore indicate a decreased efficiency of the biological pump during late HS1 and the B/A (possibly also the Younger Dryas), suggesting that the subarctic Pacific has then been a source region of atmospheric CO2.
Coverage:
Median Latitude: 53.654050 * Median Longitude: -158.696307 * South-bound Latitude: 51.268000 * West-bound Longitude: 167.725000 * North-bound Latitude: 54.390700 * East-bound Longitude: -148.921300
Date/Time Start: 2001-06-09T20:05:00 * Date/Time End: 2009-08-02T08:30:00
Comment:
Ages have been revised after publishing in Maier (2014), here the revised ages are given.
Size:
14 datasets

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Datasets listed in this publication series

  1. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table 1) Planktic (N. pachyderma sin) radiocarbon ages and calibrated ages of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834300
  2. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S1A) Planktic (N. pachyderma sin) radiocarbon ages and calibrated ages of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.834303
  3. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S1B) Planktic (N. pachyderma sin) radiocarbon ages and calibrated ages of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.834307
  4. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S2A) Contamination of purified diatom samples with non-biogenic silicates estimated from SiO2 and Al2O3 percentages determined by ICP-OES of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834315
  5. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S2B) Contamination of purified diatom samples with non-biogenic silicates estimated from SiO2 and Al2O3 percentages determined by EDS of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834405
  6. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S2C) Contamination of purified diatom samples with non-biogenic silicates estimated from SiO2 and Al2O3 percentages determined by EDS of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.834314
  7. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S3A) Composition of pre-sonicated diatom samples of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834317
  8. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S3B) Composition of final purified diatom samples of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834318
  9. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S4A) Oxygen and silicon stable isotopes of diatom silica of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834320
  10. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S4B) Oxygen and silicon stable isotopes of diatom silica of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.834319
  11. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S5A) Stable oxygen isotope ratios on Neogloboquadrina pachyderma sin on sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834326
  12. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S5B) Biogenic opal content of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834327
  13. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S5C) Opal mass accumulation rates of sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834328
  14. Maier, E; Méheust, M; Abelmann, A et al. (2015): (Table S5D) X-ray fluorescence measurements on sediment core SO202-27-6. https://doi.org/10.1594/PANGAEA.834329