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OAS accession Detail for 0278669
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| accessions_id: | 0278669 | 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 Acadiana cruise 18-21 September 2017 (NCEI Accession 0278669) |
| Abstract: | This dataset contains chemical and physical data collected on R/V Acadiana during cruise AC18-12 in the Gulf of Mexico from 2017-09-18 to 2017-09-21. These data include Ammonium, Dissolved Organic Nitrogen, Nitrate, Nitrite, Total Dissolved Nitrogen, depth, dissolved Oxygen, dissolved organic Carbon, nitrate plus nitrite, reactive phosphorus (PO4), salinity, and water temperature. The instruments used to collect these data include CTD Sea-Bird SBE SEACAT 19plus, 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 Sept 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: | 20170918 |
| End date: | 20170921 |
| Seanames: | Coastal Waters of Louisiana, Gulf of Mexico |
| West boundary: | -93.427 |
| East boundary: | -90.228 |
| North boundary: | 29.642 |
| South boundary: | 28.383 |
| Observation types: | chemical, physical |
| Instrument types: | CTD, flow injection analyzer, Niskin bottle, Total Organic Carbon (TOC) analyzer |
| Datatypes: | AMMONIUM (NH4), DEPTH - OBSERVATION, DISSOLVED ORGANIC CARBON, Dissolved Organic Nitrogen, DISSOLVED OXYGEN, NITRATE, nitrate + nitrite content (concentration), NITRITE, phosphate, SALINITY, Total Dissolved Nitrogen (TDN), WATER TEMPERATURE |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | Louisiana Universities Marine Consortium |
| Contributing projects: | |
| Platforms: | Acadiana (33SZ) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Conductivity, Temperature and Depth (CTD) data and water samples were collected at various depths across 23 stations (total n = 68) from the Louisiana-Texas shelf in the Gulf of Mexico using the R/V Acadiana between September 18, 2017 and September 21, 2017. At all stations, a vertical profile of salinity, dissolved oxygen concentration and temperature was collected using a CTD. The CTD rosette was equipped with 6, 4 L 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. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-24 04:22:57+00 |
| Editdate: | 2023-05-24 04:24:25+00 |