(Table S1) N15 isotope ratios, age determination and accumulation rates of sediment core HLY02-02-17 ...

• Main Authors: Brunelle, Brigitte G, Sigman, Daniel M, Cook, Mea S, Keigwin, Lloyd D, Haug, Gerald H, Plessen, Birgit, Schettler, Georg, Jaccard, Samuel L
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: DEPTH, sediment/rock; AGE; δ15N, bulk sediment; δ15N; Opal, biogenic silica; Barium; Aluminium; Barium, biogenic; Nitrogen, total; Calcium carbonate; Neogloboquadrina pachyderma sinistral, δ18O; Uvigerina sp., δ18O; Age, dated; Age, dated standard deviation; Calendar age, maximum/old; Calendar age, minimum/young; Accumulation rate, mass; Accumulation rate, barium; Accumulation rate, calcium; Accumulation rate, opal; Jumbo Piston Core; Age, 14C AMS; Age, 14C calibrated; Normalized; HLY0202; Healy; Bering Sea; Haug; Pacific; Neogloboquadrina pachyderma; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.833622; https://doi.pangaea.de/10.1594/PANGAEA.833622

In a piston core from the central Bering Sea, diatom microfossil-bound N isotopes and the concentrations of opal, biogenic barium, calcium carbonate, and organic N are measured over the last glacial/interglacial cycle. Compared to the interglacial sections of the core, the sediments of the last ice age are characterized by 3 per mil higher diatom-bound d15N, 70 wt % lower opal content and 1200 ppm lower biogenic barium. Taken together and with constraints on sediment accumulation rate, these results suggest a reduced supply of nitrate to the surface due to stronger stratification of the upper water column of the Bering Sea during glacial times, with more complete nitrate consumption resulting from continued iron supply through atmospheric deposition. This finding extends the body of evidence for a pervasive link between cold climates and polar ocean stratification. In addition, we hypothesize that more complete nutrient consumption in the glacial age subarctic Pacific contributed to the previously observed ... : Supplement to: Brunelle, Brigitte G; Sigman, Daniel M; Cook, Mea S; Keigwin, Lloyd D; Haug, Gerald H; Plessen, Birgit; Schettler, Georg; Jaccard, Samuel L (2007): Evidence from diatom-bound nitrogen isotopes for subarctic Pacific stratification during the last ice age and a link to North Pacific denitrification changes. Paleoceanography, 22(1), PA1215 ...