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OAS accession Detail for 0278012
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| accessions_id: | 0278012 | archive |
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| Title: | Discrete data on hydrography (from CTD casts) and chemical analyses of dissolved nutrients and organic carbon on the Louisiana-Texas shelf in the Gulf of Mexico from R/V Pelican cruise 28 September – 11 October 2017 (NCEI Accession 0278012) |
| Abstract: | This dataset contains biological, chemical, and physical data collected on R/V Pelican during cruise PE18-11 in the Gulf of Mexico from 2017-09-28 to 2017-10-11. These data include Ammonium, Dissolved Organic Nitrogen, Nitrate, Nitrite, PAR, Total Dissolved Nitrogen, colored dissolved organic matter, depth, depth_bottom, dissolved Oxygen, dissolved organic Carbon, nitrate plus nitrite, reactive phosphorus (PO4), salinity, turbidity, and water temperature. The instruments used to collect these data include CTD Sea-Bird 911, Flow Injection Analyzer, Niskin bottle, and Total Organic Carbon Analyzer. These data were collected by Brian Roberts of Louisiana Universities Marine Consortium as part of the "Collaborative Research: A RAPID response to Hurricane Harvey's impacts on coastal carbon cycle, metabolic balance and ocean acidification (HarveyCarbonCycle)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2022-08-23. The following is the text of the dataset description provided by BCO-DMO: Discrete Samples Oct 2017 Dataset Description: Usage note: Time zone information was not received by BCO-DMO so it is unknown if the dates and times in this dataset are local or UTC. Please contact the dataset PI if you have questions about this. |
| Date received: | 20220823 |
| Start date: | 20170928 |
| End date: | 20171011 |
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| West boundary: | -95.309 |
| East boundary: | -88.901 |
| North boundary: | 29.641 |
| South boundary: | 27.496 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Conductivity, Temperature and Depth (CTD) data and water samples were collected at various depths across 102 stations (total n = 471) in the Gulf of Mexico on the R/V Pelican between September 28, 2017 and September 19, 2017. At all stations, a vertical profile of salinity, dissolved oxygen concentration and temperature was collected using a Seabird SBE 911 CTD instrument package mounted onto a rosette containing 12, 5L Niskin bottles for collecting aqueous samples at specific depths. Water samples were collected using a single Niskin bottle per depth and were analyzed across various analytical instruments for nutrient concentrations. Water samples were collected using a single Niskin bottle per depth on the CTD rosette. Samples for dissolved inorganic nutrients and dissolved organic carbon / total nitrogen were analyzed following the methods detailed in Roberts and Doty (2015) and Mason et al. (2016). Specifically, one niskin bottle, water samples for dissolved inorganic nutrients (NO₃⁻ + NO₂⁻, NO₂⁻, PO₄³−, SiO₂, and NH₄⁺) were analyzed in duplicate using a Lachat Instruments QuikChem FIA+ 8000 Series Automated Ion Analyzer with an ASX-400 Series XYZ autosampler after being filtered through acid-cleaned (10% HCl), 47 mm diameter, 0.2 µm pore size, membrane filters (Pall SuporR-200) under low vacuum pressure. Samples were analyzed for dissolved NO₃⁻ + NO₂⁻ (by Cu-Cd reduction followed by azo dye colorimetry), PO₄³− (by the automated ascorbic acid reduction method), SiO₂⁻, and dissolved NH₄⁺ (by phenate colorimetry) (APHA, 1992). Dissolved NO₂⁻ was determined separately by azo dye colorimetry (without Cu−Cd reduction). Standard curves were prepared using certified standard stock solutions (Hach, Loveland CO) and yielded r² values of ≥ 0.999. NO₃⁻ concentration was determined by difference between NO₃⁻ + NO₂⁻ and NO₂⁻. Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations were measured at least in triplicate on a Shimadzu TOC-VCSH Analyzer with TNM-1 Module (MDL 1.5 μmol C L−1, 0.3 μmol N L−1; Shimadzu Scientific Instruments, Columbia, MD) after being filtered through combusted (450°C), 47mm diameter Whatman GF/F filters under low vacuum pressure. Concentrations of dissolved organic nitrogen (DON) were determined by difference [DON=TDN−DIN]. All water chemistry data went through quality control checks. CTD instrument probes were calibrated prior to cruise departure. |
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| Metadata version: | 1 |
| Keydate: | 2023-05-11 04:00:50+00 |
| Editdate: | 2023-05-11 04:01:32+00 |