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OAS accession Detail for 0292004
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| accessions_id: | 0292004 | archive |
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| Title: | Dissolved aluminum (Al) and manganese (Mn) and total dissolvable Al and Mn from subsurface water samples collected during three cruises in 2010 in the northern Gulf of Alaska (NCEI Accession 0292004) |
| Abstract: | This dataset contains chemical data collected on R/V Montague during cruises CR2010-01, CR2010-02, and CR2010-04 in the Gulf of Alaska from 2010-04-07 to 2010-07-29. These data include Aluminum, Manganese, and depth. The instruments used to collect these data include CTD Sea-Bird, Flow Injection Analyzer, and Niskin bottle. These data were collected by Robert William Campbell of Prince William Sound Science Center, John Crusius of USGS Alaska Science Center, Joseph A. Resing of UW-NOAA Joint Institute for the Study of the Atmosphere and Ocean, Andrew Schroth of University of Vermont, and Susanna Michael of University of Washington as part of the "US GEOTRACES Pacific Section-Shipboard Al, Mn and Fe (EPZT Shipboard Al Mn Fe)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2023-10-25. The following is the text of the dataset description provided by BCO-DMO: Gulf of Alaska Al and Mn - Vertical Profiles Dataset Description: These data were funded through the following: NSF OCE-1237011; NOAA-PMEL Earth Ocean Interactions Program, NOAA Cooperative Agreement NA15OAR4320063, Contribution No. 2022-1176; and by the Cooperative Institute for Climate, Ocean, & Ecosystem Studies (CIOCES) under NOAA Cooperative Agreement NA20OAR4320271, Contribution No. 2022-1176, and PMEL Contribution No. 5345. Methods and Sampling: Data were collected from the Northern Gulf of Alaska, along the shelf and slope from the mouth of the Copper River to about 50 kilometers (km) past the shelf break. This was roughly along a N/S transect along ~145º West, between 59º North and 60.2º North and a few samples collected along an E/W transect between ~146º West and 145º West. Sample collection occurred during three research cruises in 2010 (7-9 April (CR2010-01), 5-7 May (CR2010-02), and 27-29 July (CR2010-04). Samples below the surface were collected using 8 L externally closed Niskin bottles whose inner face was Teflon-coated, attached to Spectra (Dyneema) line, and triggered at depth using Teflon-lined messengers. Additionally, profiles of salinity, temperature, fluorescence, and turbidity were measured with a Seabird SBE16 CTD, deployed at the same time as the collection of the subsurface water samples. All water column profiles were carried out to within roughly 5 m of the maximum water depth, except at station 5, where the water depth was ~4000 m. Niskin bottles were processed in the shipboard clean lab within 3 hours or less of sample collection. Acid-washed 0.45 μm Pall Supor filters were used in the clean lab to filter the seawater samples collected using Niskin bottles, also under N₂ pressure. All trace metal samples were stored double-bagged in acid-cleaned low-density polyethylene bottles and acidified to pH 1.8 in the shipboard clean lab with Seastar™ concentrated HCl within 3 days of collection, then stored for >6 months prior to analysis. Surface waters were sampled by underway pumping of seawater through Teflon-lined tubing using a technique adapted from that of Vink et al. (2000), with the intake positioned a few centimeters forward from, and mounted to, a PVC towfish towed ~2 meters (m) below the surface. Data from surface samples are available as a related dataset (BCO-DMO dataset 891941). Filtered samples were analyzed for dissolved aluminum (Al) and unfiltered samples were analyzed for total dissolvable Al using Flow Injection Analysis (Resing and Measures 1994) using fluorescent detection of lumogallion. Samples exceeding 100 nanomolar (nM) were diluted with low-aluminum, low-manganese seawater to ensure linear response of the standard curve. Samples were assigned to a low, medium, or high standard curve depending on concentration. Low concentration samples were considered to be 0-20 nM, medium: 10-100, and high 100-2000 nM. Standards of 0, 1, 5, and 15 nM (low curve); 10, 50, 100 nM (medium curve); and 750 nM and 2000 nM (high curve) were analyzed in replicate. For the low curve, the detection limit was 0.79 nM, and 1 nM standards had a relative standard deviation (RSD) of 33% (n = 8). The minimum concentration of all samples analyzed was 3.7 nM; there were only four samples with concentrations less than 5 nM. The 5 nM standard had an RSD of 6% (n = 10), and the 15 nM standard had an RSD of 3% (n = 10). For the medium curve, the 10 nM standard had an RSD of 4% (n = 10), and the 50 nM and 100 nM standards had RSDs of 1%. The 750 nM and 2000 nM standards were measured to have a relative standard deviation Filtered samples were analyzed for dissolved manganese (Mn) and unfiltered samples were analyzed for total dissolvable Mn according to the method of Resing and Mottl (1992), which uses spectroscopic detection of leuchomalachite green. A similar method to that described above was used to determine the accuracy of the wide spread of the data. Standards were run 10 times in succession to determine the daily precision. The 5 nM standard had a relative standard deviation of 3%, the 20 nM and 50 nM standards had RSDs of 1%. A sample collected during the campaign was used as an internal standard and analyzed at least daily, with a concentration determined to be 25.2 nM ± 0.7 (1 SD, n = 20). The limit of detection was determined by analyzing the lowest standard (0.52 nM) in replicate (SD = 0.86 nM). This value is 12% of the lowest sample analyzed. Known Issues/Problems: CTD data for April Station 5 does not extend to depth, and the CTD profile for April Station 3 was not collected. |
| Date received: | 20231025 |
| Start date: | 20100407 |
| End date: | 20100729 |
| Seanames: | Gulf of Alaska |
| West boundary: | -145.2 |
| East boundary: | -144.916 |
| North boundary: | 60.191 |
| South boundary: | 59.077 |
| Observation types: | chemical |
| Instrument types: | CTD, flow injection analyzer, Niskin bottle |
| Datatypes: | Aluminum, MANGANESE |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of Washington, US DOC; NOAA; NOS; ONMS; National Marine Sanctuary of American Samoa |
| Contributing projects: | |
| Platforms: | MONTAGUE (32M9) |
| Number of observations: | |
| Supplementary information: | |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2024-04-29 15:37:40+00 |
| Editdate: | 2024-04-29 15:38:13+00 |