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  • AGE; Calypso Square Core System; CASQS; DEPTH, sediment/rock; Foraminifera, planktic δ15N; Foraminifera, planktic δ15N, standard error; Globigerinoides ruber, δ15N; Globigerinoides ruber, δ15N, standard error; IMAGES IX - PAGE; Marion Dufresne (1995); MD022550C2; MD02-2550C2; MD127; Number of measurements; Number of subsamples; Orbulina universa, δ15N; Orbulina universa, δ15N, standard error; Orca Basin  (1)
  • Anthropogenic climate change  (1)
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  • 1
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    PANGAEA
    In:  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, https://doi.org/10.1029/2011PA002156
    Publication Date: 2023-10-05
    Description: 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 reflects a whole ocean increase in the d15N of nitrate during deglaciation. The d15N of the surface dwelling foraminifera Globigerinoides ruber and the corrected bulk d15N show little sign of this deglacial peak, both decreasing from last glacial values much earlier than does the d15N of O. universa; this may indicate that G. ruber and bulk N reflect the euphotic zone signal of an early local increase in N2-fixation. Our results add to the evidence that, during the last ice age, the larger iron input from dust did not lead to enhanced N2-fixation in this region. Rather, the glacial-to-Holocene decrease in d15N is best explained by a response of N2-fixation within the Atlantic to the deglacial increase in global ocean denitrification.
    Keywords: AGE; Calypso Square Core System; CASQS; DEPTH, sediment/rock; Foraminifera, planktic δ15N; Foraminifera, planktic δ15N, standard error; Globigerinoides ruber, δ15N; Globigerinoides ruber, δ15N, standard error; IMAGES IX - PAGE; Marion Dufresne (1995); MD022550C2; MD02-2550C2; MD127; Number of measurements; Number of subsamples; Orbulina universa, δ15N; Orbulina universa, δ15N, standard error; Orca Basin
    Type: Dataset
    Format: text/tab-separated-values, 107 data points
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  • 2
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Annual Review of Marine Science 8 (2016): 185-215, doi:10.1146/annurev-marine-052915-100829.
    Description: The ocean, a central component of Earth’s climate system, is changing. Given the global scope of these changes, highly accurate measurements of physical and biogeochemical properties need to be conducted over the full water column, spanning the ocean basins from coast to coast, and repeated every decade at a minimum, with a ship-based observing system. Since the late 1970s, when the Geochemical Ocean Sections Study (GEOSECS) conducted the first global survey of this kind, the World Ocean Circulation Experiment (WOCE) and Joint Global Ocean Flux Study (JGOFS), and now the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) have collected these “reference standard” data that allow quantification of ocean heat and carbon uptake, and variations in salinity, oxygen, nutrients, and acidity on basin scales. The evolving GO-SHIP measurement suite also provides new global information about dissolved organic carbon, a large bioactive reservoir of carbon.
    Description: Climate Observations Division of the U.S. NOAA Climate Program Office and NOAA Research; Joint Institute for the Study of the Atmosphere and Ocean (JISAO) under NOAA Cooperative Agreement NA10OAR4320148; U.S. National Science Foundation [OCE- 0223869; OCE-0752970; OCE-0825163; OCE-1434000; OCE 0752972; OCE-0752980; OCE-1232962; OCE-1155983; OCE-1436748]; U.S. CLIVAR Project Office; Global Environment and Marine Department, Japan Meteorological Agency; Australian Climate Change Science Program (Australian Department of Environment and CSIRO); U.K. Natural Environment Research Council; European Union’s FP7 grant agreement 264879 (CarboChange); Horizon 2020 grant agreement No 633211; ETH Zurich Switzerland.
    Keywords: Anthropogenic climate change ; Ocean temperature change ; Salinity change ; Ocean carbon cycle ; Ocean oxygen and nutrients ; Ocean chlorofluorocarbons ; Ocean circulation change ; Ocean mixing
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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