The Ocean Archive System searches our original datasets as they were submitted to us, not individual points or profiles. If you want to search and retrieve ocean profiles in a common format, or objectively analyzed fields, your better option may be to use one of our project applications. See: Access Data
OAS accession Detail for 0278165
| << previous | |revision: 1 |
| accessions_id: | 0278165 | archive |
|---|---|
| Title: | Mercury and methylmercury concentrations in surface snow samples from USCGC Healy HLY1502 in the Canada and Makarov Basins of the Arctic Ocean; Dutch Harbor to Dutch Harbor from August to October 2015 (NCEI Accession 0278165) |
| Abstract: | This dataset contains chemical and physical data collected on USCGC Healy during cruise HLY1502 in the Arctic Ocean from 2015-09-04 to 2015-09-19. These data include trace metal concentration. The instruments used to collect these data include Automated Mercury Analysis System, Cold Vapor Atomic Fluorescence Spectrophotometer, and Precipitation Sampler. 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: Mercury and methylmercury concentrations in surface snow Dataset Description: The data include measurements of mercury and methylmercury concentrations in surface snow samples from the GEOTRACES Arctic Ocean cruise in 2015 (HLY1502, GN01). |
| Date received: | 20210219 |
| Start date: | 20150904 |
| End date: | 20150919 |
| Seanames: | Arctic Ocean |
| West boundary: | 89.253 |
| East boundary: | -148.894 |
| North boundary: | 89.99 |
| South boundary: | 82.504 |
| Observation types: | chemical, physical |
| Instrument types: | spectrophotometer |
| Datatypes: | TRACE METALS |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of Connecticut |
| Contributing projects: | GEOTRACES |
| Platforms: | Healy (33HQ) |
| Number of observations: | |
| 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: Triplicate bulk snow samples were collected at the same sites as the ice cores. Snow was collected using an acid cleaned HDPE shovel, and transported in a LDPE container before being melted and subsampled on board. After collection, snow and ice samples were melted and transferred to acid-cleaned glass bottles (I-CHEM Certified 200 series), and precipitation samples were stored in Teflon FEP bottles. All samples were kept frozen at -20C in the dark, and were transported back to the University of Connecticut for analysis. Methylmercury concentrations were determined following the ascorbic acid-assisted direct ethylation method (Munson et al., 2014) using a Tekran 2700 instrument and autosampler to automate the purging, trapping, and detection via cold vapor atomic fluorescence spectroscopy (CVAFS). Samples were thawed then acidified to 1% (v/v) H2SO4 and left to digest overnight before neutralizing with 8N potassium hydroxide (KOH), buffering with 4M acetate, adding 2.5% (w/v) ascorbic acid and finally 1% (w/v) sodium tetraethyl borate (NaTEB) to ethylate the methylmercury. Total mercury concentrations were determined by dual gold-amalgamation CVAFS utilizing a Tekran 2600 instrument in accordance with U.S. EPA Method 1631. Briefly, waters were digested with bromine monochloride (BrCl) followed by a pre-reduction step with hydroxylamine hydrochloride (NH₂OH·HCl). Inorganic Hg(II) was then reduced to Hg⁰ using stannous chloride (SnCl₂) prior to automated analysis on the Tekran. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-14 04:03:14+00 |
| Editdate: | 2023-05-14 04:03:56+00 |