(Table 1) N-isotope record of planktonc foraminifera of sediment core MD02-2550C2 ...

• Main Authors: Meckler, Anna Nele, Ren, Haojia Abby, Sigman, Daniel M, Gruber, Nicolas, Plessen, Birgit, Schubert, Carsten J, Haug, Gerald H
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: DEPTH, sediment/rock; AGE; Globigerinoides ruber, δ15N; Globigerinoides ruber, δ15N, standard error; Number of measurements; Number of subsamples; Orbulina universa, δ15N; Orbulina universa, δ15N, standard error; Foraminifera, planktic δ15N; Foraminifera, planktic δ15N, standard error; Calypso Square Core System; MD127; Marion Dufresne 1995; Orca; ren
• Online Access: https://dx.doi.org/10.1594/pangaea.829514; https://doi.pangaea.de/10.1594/PANGAEA.829514

Constraining variations in marine N2-fixation over glacial-interglacial timescales is crucial for determining the role of the marine nitrogen cycle in modifying ocean productivity and climate, yet paleo-records from N2-fixation regions are sparse. Here we present new nitrogen isotope (d15N) records of bulk sediment and foraminifera test-bound (FB) nitrogen extending back to the last ice age from the oligotrophic Gulf of Mexico (GOM). Previous studies indicate a substantial terrestrial input during the last ice age and early deglacial, for which we attempt to correct the bulk sediment d15N using its observed relationship with the C/N ratio. Both corrected bulk and FB-d15N reveal a substantial glacial-to-Holocene decrease of d15N toward Holocene values of around 2.5 per mil, similar to observations from the Caribbean. This d15N change is most likely due to a glacial-to-Holocene increase in regional N2-fixation. A deglacial peak in the FB-d15N of thermocline dwelling foraminifera Orbulina universa probably ... : Supplement to: Meckler, Anna Nele; Ren, Haojia Abby; Sigman, Daniel M; Gruber, Nicolas; Plessen, Birgit; Schubert, Carsten J; Haug, Gerald H (2011): Deglacial nitrogen isotope changes in the Gulf of Mexico: Evidence from bulk sedimentary and foraminifera-bound nitrogen in Orca Basin sediments. Paleoceanography, 26(4), PA4216 ...