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OAS accession Detail for 0278032
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| accessions_id: | 0278032 | archive |
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| Title: | Natural abundance N2O isotopomers measured from seawater samples collected in the Eastern Tropical North Pacific during R/V Sally Ride (SR1805) cruise from March to April 2018 (NCEI Accession 0278032) |
| Abstract: | This dataset contains chemical and physical data collected on R/V Sally Ride during cruise SR1805 in the North Pacific Ocean from 2018-03-13 to 2018-04-04. These data include Nitrate, Nitrite, Nitrous Oxide, PAR, d15N, d18O_NO3, dN15_NO3, depth, dissolved Oxygen, salinity calculated from CTD primary sensors, sigma-theta, water pressure, and water temperature. The instruments used to collect these data include Discrete Analyzer and Isotope-ratio Mass Spectrometer. These data were collected by Colette LaMonica Kelly, Karen L. Casciotti, Nicole M. Travis, and Pascale A. Baya of Stanford University as part of the "Collaborative Research: Mechanisms and Controls of Nitrous Oxide Production in the Eastern Tropical North Pacific Ocean (N2O in ETNP)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-08-11. The following is the text of the dataset description provided by BCO-DMO: N2O Natural Abundance Isotopomers in ETNP Dataset Description: Acquisition Description: Seawater samples for dissolved nitrate, nitrite, and nitrous oxide isotope analysis were collected from either a 30-liter, 12-bottle rosette or a 12-liter, 24-bottle rosette. Samples for nitrate and nitrite isotopic analysis were collected, unfiltered, into 500 mL Nalgene polypropylene bottles following three rinses of the bottle, caps, and threads of at least 10% of the bottle volume. After collection from the rosette, samples for nitrate isotopic analysis were syringe-filtered with a 60 mL syringe through a 0.22 µM pore size Sterivex filter into 60-mL high density polyethylene bottles, then frozen at –20ºC For nitrite isotopic analysis , samples were preserved within two hours of collection for δ 15 N-NO 2 - and δ 18 O-NO 2 - using the azide method (McIlvin and Altabet, 2005), along with nitrite isotope reference materials (Casciotti et al., 2007) in different amounts. Briefly, seawater samples were added to 20 mL vials in volumes targeted to achieve 10 nmol nitrite, based on shipboard colorimetric nitrite analysis (Grasshoff et al., 1999), then capped with a gray butyl septum (National Scientific) and sealed with an aluminum crimp seal. Where [NO 2 – ] > 0.25 µM (limit of detection for these analyses, Figure S1 in Kelly et al, 2020) but For nitrous oxide isotopic analysis , samples were collected into 160 mL glass serum bottles (Wheaton), following standard gas-sampling procedures: gas-tight tubing (Tygon) was used to overflow each serum bottle with sample three times, after which a ~1 mL air headspace was introduced, and the bottle was capped with a gray butyl septum (National Scientific). Given the trace amount of N 2 O in the atmosphere (NOAA Global Monitoring Laboratory) and complete flushing of the bottle during analysis, the effect of this headspace and N 2 O partitioning between the gas and liquid phase falls within the analytical uncertainty for N 2 O concentration measurements. Samples for N 2 O isotopic analysis were promptly preserved by adding 100 µL mercuric chloride (HgCl 2 ) to each 160 mL bottle, then sealed with an aluminum crimp seal and stored at lab temperature (20-22ºC). |
| Date received: | 20210811 |
| Start date: | 20180313 |
| End date: | 20180404 |
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| West boundary: | -113 |
| East boundary: | -102.35 |
| North boundary: | 17.683 |
| South boundary: | 10 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Metadata version: | 1 |
| Keydate: | 2023-05-11 04:30:01+00 |
| Editdate: | 2023-05-11 04:30:48+00 |