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OAS accession Detail for 0278104
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| accessions_id: | 0278104 | archive |
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| Title: | Measurements of total dissolved gaseous mercury in surface waters from the US GEOTRACES Arctic cruise (HLY1502, GN01) from August to October 2015 (NCEI Accession 0278104) |
| Abstract: | This dataset contains chemical and physical data collected on USCGC Healy during cruise HLY1502 in the Arctic Ocean, Bering Sea, and Chukchi Sea from 2015-08-10 to 2015-10-11. These data include trace metal concentration. The instruments used to collect these data include Cold Vapor Atomic Fluorescence Spectrophotometer and Pump - Surface Underway Ship Intake. These data were collected by Robert Mason of University of Connecticut as part of the "Collaborative Research: GEOTRACES Arctic Section: Determination of atmospheric wet and dry deposition and air-sea exchange of mercury species from coastal and offshore waters (GEOTRACES Arctic Atmos Hg)" and "U.S. Arctic GEOTRACES Study (U.S. GEOTRACES Arctic)" projects and "U.S. GEOTRACES (U.S. GEOTRACES)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-02-19. The following is the text of the dataset description provided by BCO-DMO: The data include measurements of total dissolved gaseous mercury in surface waters Dataset Description: The data include measurements of total dissolved gaseous mercury in surface waters during the GEOTRACES Arctic Ocean cruise in 2015 (HLY1502, GN01). |
| Date received: | 20210219 |
| Start date: | 20150810 |
| End date: | 20151011 |
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| West boundary: | 167.087 |
| East boundary: | -115.351 |
| North boundary: | 89.627 |
| South boundary: | 54.23 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Methodology: Details of the methods for the cruise are given in DiMento et al. (2019). Details of the overall method and approach for dissolved gaseous mercury and atmospheric mercury methods are given in Andersson et al. (2008), Mason et al. (2017), Soerensen et al. (2014), and Soerensen et al. (2013). Analytical methods are detailed in DiMento et al. (2019) with additional information in the papers listed above and in Munson et al. (2014), Morton et al. (2013), and Gichuki & Mason (2014). See "Related Publications" below for complete citations. Sampling Procedures: Surface water samples were obtained using water collected at 5-10 m depth from the ship's underway sampling system. The water is continuously sparged with low elemental Hg (Hg⁰) air in a water-gas separation device (gas equilibrator) with a reverse flow configuration where the water is added to an inner chamber at the top and air at the bottom of the chamber. The water then flows through an outer jacket of the device to maintain the water temperature in the inner chamber at that of the incoming sweater. The device is based on the equilibrator described in detail in Andersson et al. (2008). For the best performance the water flow should be high relative to that of the air, and in this study the air flow was maintained around 1.5 L min⁻¹, somewhat higher than that required by the Tekran 2537B instrument that was used for Hg detection (1 L min⁻¹). The water flow was somewhat variable but typically was 6-10 times that of the air. The incoming air is passed through spargers that create small gas bubbles to enhance equilibration and this is also enhanced by the mixing induced by the incoming water. Based on the relative flow rates, the response time of the instrument to changes in water concentration is The detection of Hg as elemental Hg in the air after sparging relied on a Tekran 2537B instrument with a sampling resolution of 10 min. As described above, the instrument is calibrated in two ways. Air is sampled continuously as there are two sampling gold traps lines within the instrument and while one sample is being analyzed, the other is being trapped, with the timing controlled by the instrument's software. Air was sampled from the outside at a location sufficiently above the water level to prevent entrainment of water, and in a position to prevent contamination for the ships' exhaust while underway. The air is dried using a Teflon filter and a soda lime trap prior to the detector. The sampled air was passed over trapping devices to remove particulate Hg and gaseous ionic Hg prior to the measurement of elemental Hg. The device was used as prescribed by the Tekran methods and was calibrated as detailed above. |
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| Metadata version: | 3 |
| Keydate: | 2023-05-12 04:45:33+00 |
| Editdate: | 2024-05-28 22:06:17+00 |