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Living planktic foraminifera were collected for shell-bound 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\u201310% pH-buffered formalin solution and stored at 4\u00b0C until picking (Ren et al., 2012). After crushing and the appropriate cleaning steps (Ren et al., 2012; Ren et al., 2015), shell-bound N was released by dissolution with hydrochloric acid, and organic N 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\"\u00a0was 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.
\nThe 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.
Planktic foraminifer shell 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\u00b040\u2019N, 64\u00b010\u2019W) and Hydro Station S (32\u00b010\u2019N, 64\u00b034\u2019W), collectected on R/V Atlantic Explorer cruises HS1178, B274, AE1203, B280, B283, AE1220, B287, B292, B295, B299.
\nData published in:
\nSmart, 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:\u00a0https://doi.org/10.1016/j.gca.2018.05.023
Data Processing:\u00a0Isotope 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.
\nMissing data identifier = -999
\nBCO-DMO Processing: modified parameter names (replaced spaces w/ underscores).