The Ocean Archive System searches our original datasets as they were submitted to us, not individual points or profiles. If you want to search and retrieve ocean profiles in a common format, or objectively analyzed fields, your better option may be to use one of our project applications. See: Access Data
OAS accession Detail for 0277938
| << previous | |revision: 1 |
| accessions_id: | 0277938 | archive |
|---|---|
| Title: | Vertical profiles of N2 gas concentrations in excess of equilibrium values along with the isotopic composition of total N2, NO3- and NO2- from R/V New Horizon cruise NH1410 in the Eastern Tropical North Pacific from May to June 2014 (NCEI Accession 0277938) |
| Abstract: | This dataset contains chemical and physical data collected on R/V New Horizon during cruise NH1410 in the North Pacific Ocean from 2014-05-13 to 2014-06-07. These data include Nitrate, Nitrite, Nitrogen, d15N, d18O_NO3, dN15_NO3, depth, dissolved Oxygen, salinity, sigma-theta potential density, water pressure, and water temperature. The instruments used to collect these data include CTD Sea-Bird, Discrete Analyzer, Isotope-ratio Mass Spectrometer, Mass Spectrometer, and Sea-Bird SBE 43 Dissolved Oxygen Sensor. These data were collected by Mark A. Altabet of University of Massachusetts Dartmouth and Craig L. McNeil of University of Washington as part of the "Collaborative Research: Autonomous Lagrangian Floats for Oxygen Minimum Zone Biogeochemistry (OMZ Biogeochemistry Floats)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2022-05-05. The following is the text of the dataset description provided by BCO-DMO: Vertical profiles from the Mexican OMZ of N2 gas concentrations in excess of equilibrium values along with the isotopic composition of total N2, NO3- and NO2- Dataset Description: Vertical profiles from the Mexican OMZ of N2 gas concentrations in excess of equilibrium values along with the isotopic composition of total N2, NO3- and NO2-. |
| Date received: | 20220505 |
| Start date: | 20140513 |
| End date: | 20140607 |
| Seanames: | |
| West boundary: | -116.53 |
| East boundary: | -104.2 |
| North boundary: | 25.2 |
| South boundary: | 18.19 |
| Observation types: | |
| Instrument types: | |
| Datatypes: | |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | |
| Contributing projects: | |
| Platforms: | |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Sampling at sea was done using a standard SeaBird CTD/Rosette system. Hydrographic data was processed using SeaBird software and standard procedures. O2 was measured by an SBE43 sensor and final data were calibrated against Winkler O2 determinations NO3- and NO2- concentrations were measured in the laboratory on frozen samples using a SmartChem autoanalyzer using standard chemical methods N2 excess were determined from N2/Ar ratios measured using the procedures described by Charoenpong et al. (2014) with the exception that the measurements were made at sea using a Pfieffer 400 series quadrupole mass spectrometer system. Data acquisition and initial data processing used custom LabView software. Biogenic N2 concentrations were determined by subtraction of estimated background excess N2 as described in Chang et al. (2012). The d15N of N2 was determined in the laboratory using similar methodology but using an IsoPrime Isotope Ratio Mass Spectrometer (IRMS) as described by Charoenpong et al. (2014) using IonVantage software. The isotopic composition of nitrate and nitrite was determined on samples returned to the laboratory using procedures described by McIlvin and Casciotti (2011) and McIlvin and Altabet (2005). Samples for nitrate isotope analysis were preserved by mild acidification and addition of sulfamic acid to remove nitrite. Nitrite samples were preserved at high pH with NaOH to retain its d18O signature. An IsoPrime IRMS running IonVantage was used to make these measurements. Final data reduction and organization was done using Microsoft Excel. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-06 04:14:50+00 |
| Editdate: | 2023-05-06 04:15:34+00 |