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OAS accession Detail for 0277822
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| accessions_id: | 0277822 | archive |
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| Title: | Sediment pore water and solid phase geochemical analyses from samples collected on R/V Savannah cruise SAV-15-18 at the Cape Lookout Continental Shelf and Slope during July 2015 (NCEI Accession 0277822) |
| Abstract: | This dataset contains chemical data collected on R/V Savannah during cruise SAV-15-18 in the North Atlantic Ocean from 2015-07-08 to 2015-07-20. These data include dissolved inorganic Carbon, reactive phosphorus (PO4), and sulfate. The instruments used to collect these data include Flow Injection Analyzer, High Performance Liquid Chromatograph, Multi Corer, and Spectrophotometer. These data were collected by Martial Taillefert of Georgia Institute of Technology as part of the "Source, Composition, and Stability of Soluble Iron Fluxing from Continental Margin Sediments (Soluble Fe Fluxing)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-01-21. The following is the text of the dataset description provided by BCO-DMO: Sediment pore water and solid phase geochemical analyses Dataset Description: Acquisition Description: Sediments were collected and profiled immediately with voltammetric Hg/Au microelectrodes deployed on a computer-controlled micromanipulator (Beckler et al., 2016). Sediment pore waters were then extracted from the same core and either preserved until analysis or analyzed immediately onboard ship. Sampling and analyses were conducted immediately after sediment collection to minimize artifacts from exposure to the atmosphere. Sediment cores were obtained by a MC-800 multi-corer and profiled within 30 minutes with voltammetric Hg/Au microelectrodes deployed on a computer-controlled micromanipulator. After profiling, sediments were immediately sliced under N₂ atmosphere and pore waters extracted by centrifugation at 3000 rpm under N₂ atmosphere. Finally, pore waters were immediately filtered (0.2 µM PSE Puradisc syringe filters, Whatman) under N₂ atmosphere and either preserved at -20C until analysis (SO₄²⁻), dispensed directly into reagents for analysis (SPO₄³⁻), or analyzed immediately (DIC). SO₄²⁻ was measured by non-suppressed HPLC with UV detection (Beckler et al., 2014). SPO₄³⁻ was measured spectrophotometrically using the molybdate-blue method after natural color correction to avoid interferences from dissolved silica and sulfides (Murphy and Riley, 1962). Finally, DIC was measured by flow injection analysis with conductivity detection after spiking samples with 10 mM ZnCl₂ to prevent dissolved sulfide interferences (Hall and Aller, 1992). All errors reported for the electrochemical measurements represent the standard deviation of at least triplicate measurements. Errors of all other parameters represent the analytical error propagated from calibration curves, dilution, and instrumental drift. Problem report: Some of the data are missing because pore water volumes were too low to make all the measurements. |
| Date received: | 20200121 |
| Start date: | 20150708 |
| End date: | 20150720 |
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| West boundary: | -76.434 |
| East boundary: | -75.806 |
| North boundary: | 34.266 |
| South boundary: | 33.871 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Metadata version: | 1 |
| Keydate: | 2023-04-30 04:19:38+00 |
| Editdate: | 2023-04-30 04:20:17+00 |