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OAS accession Detail for 0278415
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| accessions_id: | 0278415 | archive |
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| Title: | Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project) (NCEI Accession 0278415) |
| Abstract: | This dataset contains chemical and physical data collected on R/V Thomas G. Thompson during cruise TN303 in the South Pacific Ocean from 2013-10-29 to 2013-12-18. These data include dN15_NO3, depth, depth_bottom, and water pressure. The instruments used to collect these data include GO-FLO Teflon Trace Metal Bottle and Isotope-ratio Mass Spectrometer. These data were collected by Karen L. Casciotti of Stanford University and Mark A. Altabet of University of Massachusetts Dartmouth as part of the "GEOTRACES Peru-Tahiti Nitrogen Isotope Measurements (EPZT Nitrogen Isotopes)" and "U.S. GEOTRACES East Pacific Zonal Transect (U.S. GEOTRACES EPZT)" projects and "U.S. GEOTRACES (U.S. GEOTRACES)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-03-31. The following is the text of the dataset description provided by BCO-DMO: Nitrate isotope data from the US GEOTRACES EPZT cruise. Dataset Description: Nitrate isotope data from the US GEOTRACES EPZT cruise. |
| Date received: | 20200331 |
| Start date: | 20131029 |
| End date: | 20131218 |
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| West boundary: | -152 |
| East boundary: | -77.376 |
| North boundary: | -10.25 |
| South boundary: | -16.001 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Sampling : Full depth and super station samples were collected from the ship's rosette. Samples were filtered through 0.8/0.45 um acropak5 00 filter cartridges into triple-rinsed 60 mL HDPE bottles. Demi station samples were collected from the GETORACES Go-Flo rosette. Samples were filtered through 0.2 um acropak capsule filters into triple-rinsed 60 mL HDPE bottles. Each sample was collected in triplicate. Samples were frozen at -20 C immediately and stored frozen until analysis. Analysis : Samples were analyzed for nitrate d15N using the denitrifier method (Sigman et al., 2001; Casciotti, et al., 2001, with technical updates described by McIlvin and Casciotti, 2011). In the Casciotti Lab, Nitrate isotope reference materials USGS32 and USGS34 were used to calibrate d15N. Each sample was analyzed 2-6 times. Mean and standard deviations are reported for each sample. Samples were analyzed either on a DeltaPLUS XP or DeltaV PLUS isotope ratio mass spectrometer (IRMS), both with custom-built inlets described in McIlvin and Casciotti, 2011. Where possible (concentrations exceeded 2 uM), samples and standards were analyzed in 20 nanomole aliquots. When NO3- concentrations were below 2 uM, samples were injected in maximum volume (10 mL) and calibrated using interpolations between standard curves of 5 and 20 nano moles NO3-. Samples containing nitrate concentrations lower than 0.3 uM were not analyzed. Samples containing measurable NO2- concentrations were treated with sulfuric acid prior to analysis (Granger and Sigman, 2009). |
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| Metadata version: | 1 |
| Keydate: | 2023-05-18 04:46:21+00 |
| Editdate: | 2023-05-18 04:47:03+00 |