{"@context":{"content":"http://purl.org/rss/1.0/modules/content/","dc":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","og":"http://ogp.me/ns#","rdfs":"http://www.w3.org/2000/01/rdf-schema#","sioc":"http://rdfs.org/sioc/ns#","sioct":"http://rdfs.org/sioc/types#","skos":"http://www.w3.org/2004/02/skos/core#","xsd":"http://www.w3.org/2001/XMLSchema#","owl":"http://www.w3.org/2002/07/owl#","rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","rss":"http://purl.org/rss/1.0/","site":"https://osprey.bco-dmo.org/ns#","odo":"http://ocean-data.org/schema/","emo":"http://ocean-data.org/schema/entity-matching#","bibo":"http://purl.org/ontology/bibo/","crypto":"http://id.loc.gov/vocabulary/preservation/cryptographicHashFunctions/","bcodmo":"http://lod.bco-dmo.org/id/","tw":"http://tw.rpi.edu/schema/","dcat":"http://www.w3.org/ns/dcat#","time":"http://www.w3.org/2006/time#","geo":"http://www.w3.org/2003/01/geo/wgs84_pos#","geosparql":"http://www.opengis.net/ont/geosparql#","sf":"http://www.opengis.net/ont/sf#","void":"http://rdfs.org/ns/void#","sd":"http://www.w3.org/ns/sparql-service-description#","dctype":"http://purl.org/dc/dcmitype/","prov":"http://www.w3.org/ns/prov#","schema":"http://schema.org/","geolink":"http://schema.geolink.org/1.0/base/main#","spdx":"http://spdx.org/rdf/terms#","bcodmo_vocab":"http://schema.bco-dmo.org/"},"@id":"http://lod.bco-dmo.org/id/dataset/778158#graph","@graph":[{"http://lod.bco-dmo.org/id/dataset/778158":{"@id":"http://lod.bco-dmo.org/id/dataset/778158","@type":["http://ocean-data.org/schema/DeploymentDatasetCollection","http://www.w3.org/ns/dcat#Dataset","http://ocean-data.org/schema/Dataset"],"http://ocean-data.org/schema/hasAcquisitionDescription":[{"@value":"<div><p>Inocula of 15N2-enriched water were prepared according to either of two protocols outlined by Klawonn et al. (2015).\u00a0<br />\nIn a first Trial A, respective 1.9 mL of 15N2 gas aliquots (Cambridge Isotope Laboratories, Lot #I-21065) were injected into crimped-sealed 120 mL glass serum vials filled with deionized water. To dissolve the 15N2 bubble, each of the two serum vials was vortexed for 5 minutes. Two subsamples of each inoculum were dispensed into Exetainers\u2122 with a peristaltic pump for analysis on the MIMS. An aliquot of each inoculum (5 % vol/vol) was then dispensed in replicate 160 mL serum incubation bottles containing air-equilibrated deionized water (Trials A1-A4), which were then crimped-sealed. Following homogenization, triplicate subsamples of each incubation were collected in Exetainers\u2122 for MIMS analysis. The 15N atom % of the inocula and of the corresponding incubations were measured by MIMS at the University of Connecticut (Bay Instruments) and computed as follows:\u00a0</p>\n<p>Equation 4:\u00a0<img alt=\"equation 4\" src=\"https://datadocs.bco-dmo.org/docs/302/EAGER_NitFix/data_docs/equation_4.jpg\" style=\"height:97px; width:975px\" /></p>\n<div>In Trial B, duplicate 6 mL, 12 mL, and 24 mL aliquots of enriched seawater, prepared as per Wilson et al. (2012; Cambridge Isotope Laboratories 15N2 gas aliquots, Lot #I-19168A), were added to 100 mL glass serum vials, filled with air equilibrated seawater, and crimp-sealed with no headspace using Teflon-lined septa. Triplicate subsamples of this dilution series and the enriched seawater were analyzed at the University of Hawaii on a MIMS (Bay Instruments; Eq. 4).<br />\n\u00a0</div>\n<div>In both trials, the concentration of N2 isotopologues (m/z 28, 29, and 30) in each of the 15N2-enriched inocula was then extrapolated from the ionization efficiency of N isotopologues in air-equilibrated seawater. We define the ionization efficiency as the ratio of the isotopologue ion current measured by MIMS relative to its concentration in air-equilibrated seawater (ASW):\u00a0<br />\n\u00a0</div>\n<div>Equation S2:\u00a0<img alt=\"equation S2\" src=\"https://datadocs.bco-dmo.org/docs/302/EAGER_NitFix/data_docs/equation_s2.jpg\" style=\"height:91px; width:975px\" /></div>\n<div>\nFor instance, at a temperature of 25\u00baC and salinity of 35 psu, the solubility coefficients of Hamme and Emerson (2004) predict a N2 concentration of 388.9 \u03bcmol kg-1. The fraction of 15N in N2 (i.e., 15N/(14N+15N)) for air-equilibrated seawater is 0.003663 (Mariotti, 1983), such that the expected fractions of 28N2, 29N2, and 30N2 derived from their binomial probability distributions are as follows:<br />\n\u00a0</div>\n<div><img alt=\"equation s3a\" src=\"https://datadocs.bco-dmo.org/docs/302/EAGER_NitFix/data_docs/equation_s3a.jpg\" style=\"height:102px; width:975px\" /></div>\n<div>\u00a0 = 99.2687 % Equation S3a</div>\n<div><img alt=\"equation s3b\" src=\"https://datadocs.bco-dmo.org/docs/302/EAGER_NitFix/data_docs/equation_s3b.jpg\" style=\"height:97px; width:975px\" />= 0.7299 % Equation S3b</div>\n<div><img alt=\"equation s3c\" src=\"https://datadocs.bco-dmo.org/docs/302/EAGER_NitFix/data_docs/equation_s3c.jpg\" style=\"height:102px; width:975px\" />= 0.0013 % Equation S3c<br />\n\u00a0</div>\n<div>Accordingly, air-equilibrated concentrations of 28N2, 29N2, and 30N2 at this temperature and salinity are 386.0, 2.8, and 0.005 \u03bcmol kg-1, respectively. The ionization efficiency of the isotopologues is then equal to the ion current of m/z 28 recorded for ASW divided by the corresponding 28N2 concentration (Eq. S2). We used the ionization efficiency of m/z 28 in ASW to derive the N2 isotopologue concentrations in the inocula from their respective MIMS ion currents. We did not derive distinct ionization efficiencies from the ion current-to-concentration of m/z 29 and 30 in ASW, as these isotopologues are poorly resolved by the MIMS at natural abundance. Thus, we are assuming that the ionization efficiency of m/z 29 and 30 isotopologues is roughly similar to that of m/z 28 (i.e., that ionization isotope effects are negligible for our purposes). The initial expected AN2 of the \u201cincubations\u201d was then calculated using a linear mixing model with N2 isotopologue concentrations in ambient and enriched seawater</div></div>","@type":"rdf:HTML"}],"http://ocean-data.org/schema/hasBriefDescription":[{"@value":"Trial b test of the dissolution method","@language":"en-US"}],"http://purl.org/dc/terms/description":[{"@value":"<div><p>Trial b test of the dissolution method</p></div>","@type":"rdf:HTML"}],"http://www.w3.org/2000/01/rdf-schema#label":[{"@value":"trial_b","@type":"xsd:string"}],"http://ocean-data.org/schema/hasProcessingDescription":[{"@value":"<div><p>BCO-DMO Processing Notes:<br />\n- table was extracted from original spreadsheet.<br />\n-\u00a0added conventional header with dataset name, PI name, version date<br />\n- modified parameter names to conform with BCO-DMO naming conventions</p>\n<p>\u00a0</p></div>","@type":"rdf:HTML"}],"http://purl.org/dc/terms/identifier":[{"@value":"778158","@type":"xsd:int"}],"http://purl.org/dc/terms/title":[{"@value":"trial_b"}],"http://purl.org/dc/terms/date":[{"@value":"2019-09-30T15:25:34-04:00","@type":"xsd:dateTime"}],"http://purl.org/dc/terms/created":[{"@value":"2019-09-30T15:25:34-04:00","@type":"xsd:dateTime"}],"http://purl.org/dc/terms/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http://rdfs.org/ns/void#inDataset":[{"@id":"http://www.bco-dmo.org/"}],"http://ocean-data.org/schema/namedGraph":[{"@value":"urn:bcodmo:dataset:778158","@type":"xsd:token"}],"http://ocean-data.org/schema/osprey_page":[{"@id":"https://osprey.bco-dmo.org/dataset/778158"}],"http://ocean-data.org/schema/identifier":[{"@id":"urn:bcodmo:osprey:v2:node:identifier:778158"}],"http://ocean-data.org/schema/datasetTitle":[{"@value":"Trial B test of the dissolution method for estimates of the 15N2 atom% of incubations","@language":"en-US"}],"http://ocean-data.org/schema/abstract":[{"@value":"The \u201cdissolution\u201d method to measure N2 fixation rates with 15N2 gas tracer involves the preparation of 15N2-enriched water that is then added to each incubation bottle. Investigators typically measure the 15N2 atom% of the 15N2-enriched inoculum by MIMS, and extrapolate the 15N2 atom% in the incubations based on the inoculum value. Here, we demonstrate that such extrapolation yields inaccurate estimates of the 15N2 atom% of incubations. The latter should be measured directly.","@language":"en-US"}],"http://purl.org/dc/terms/rights":[{"@id":"https://creativecommons.org/licenses/by/4.0/"}],"http://ocean-data.org/schema/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http://purl.org/dc/terms/bibliographicCitation":[{"@value":"Granger, J., Bourbonnais, A., Wilson, S. (2019) Trial B test of the dissolution method for estimates of the 15N2 atom% of incubations. Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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