<div><p>Living planktic foraminifera were collected for tissue N analysis from the upper 200 m of the water column using a 1-m2, 200-um-mesh plankton net aboard the R/V Atlantic Explorer during ten cruises between July 2011 and November 2013. Approximately 90% of the tow material was preserved in a 5–10% pH-buffered formalin solution and stored at 4°C until picking (Ren et al., 2012). After crushing and the appropriate cleaning steps (Ren et al., 2012; Ren et al., 2015), organic N (tissue) samples were converted to nitrate using a basic persulfate oxidising reagent (POR; a potassium persulfate/sodium hydroxide solution) (Nydahl, 1978; Knapp et al., 2005). The "denitrifier method" was used to convert sample nitrate to N2O gas for isotope analysis (Sigman et al., 2001; Casciotti et al., 2002; Weigand et al., 2016). See methods section of Smart et al. (2018) for more details of sample collection, isotope analysis and data quality.</p>
<p>The isotopic composition of N2O was measured at Princeton University by GC-IRMS using a Thermo MAT 253 mass spectrometer with a purpose-built on-line N2O extraction and purification system. See methods section of Smart et al. (2018) for more details of sample collection, isotope analysis and data quality.</p></div>
Planktic foraminifer tissue d15N from net tows in the Sargasso Sea
<div><p>Planktic foraminifer tissue d15N from net tows in the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Net tow samples from 0-200 m at BATS (31°40’N, 64°10’W) and Hydro Station S (32°10’N, 64°34’W), collectected on R/V Atlantic Explorer cruises HS1178, B274, AE1203, B280, B283, AE1220, B287, B292, B295, B299.</p>
<p>Data published in:<br />
Smart, S.M., H. Ren, S.E. Fawcett, R. Schiebel, M. Conte, P.A. Rafter, K.K. Ellis, M.A. Weigand, S. Oleynik, G.H. Haug, D.M. Sigman (2018). Ground-truthing the planktic foraminifer-bound nitrogen isotope paleo-proxy in the Sargasso Sea, Geochimica et Cosmochimica Acta, doi: <a href="https://doi.org/10.1016/j.gca.2018.05.023" target="_blank">https://doi.org/10.1016/j.gca.2018.05.023</a></p></div>
Planktic foraminifer tissue d15N from net tows
<div><p>Data Processing: Isotope ratio measurements were referenced against automated injections of N2O from a gas cylinder, and then calibrated to N2 in air using two international reference materials IAEA-N3 and USGS-34 that were included in every run. An in-house N2O standard was also measured along with each batch of samples to monitor mass spectrometry. Oxidized samples were additionally corrected for the contribution of the N blank associated with the POR.</p>
<p>Missing data identifier = -999</p>
<p>BCO-DMO Processing: modified parameter names (replaced spaces w/ underscores).</p></div>
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Planktic foraminifer tissue d15N from net tows
2018-10-03T14:16:05-04:00
2018-10-03T14:16:05-04:00
2023-07-07T16:10:26-04:00
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Planktic foraminifer tissue d15N from net tows in the Sargasso Sea at BATS and Hydro Station S
Planktic foraminifer tissue d15N from net tows in the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Net tow samples from 0-200 m at BATS (31°40’N, 64°10’W) and Hydro Station S (32°10’N, 64°34’W), collectected on R/V Atlantic Explorer cruises HS1178, B274, AE1203, B280, B283, AE1220, B287, B292, B295, B299.
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Sigman, D. (2018) Planktic foraminifer tissue d15N from net tows in the Sargasso Sea at BATS and Hydro Station S. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2018-10-02 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.747248.1 [access date]
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