Paleoceanography of sediment cores SO202-27-6 and MD01-2416 ...

• Main Authors: Maier, Edith, Méheust, Marie, Abelmann, Andrea, Gersonde, Rainer, Chapligin, Bernhard, Ren, Jian, Stein, Ruediger, Meyer, Hanno, Tiedemann, Ralf
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2015
• Subjects: Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Ice Sheet; Sea ice; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.834308; https://doi.pangaea.de/10.1594/PANGAEA.834308

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 ... : Ages have been revised after publishing in Maier (2014), here the revised ages are given. ...