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

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...

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Bibliographic Details
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
Description
Summary: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 ...

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