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Title Sum-
Institution Dataset ID
     data   graph     files  public Mercury stable isotope values for precipitation collected around Station ALOHA from 2005 to
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv
attribute NC_GLOBAL acquisition_description String Open ocean precipitation was collected during the summer cruise using a manual
collection method. The samples from the Island of Hawaii were collected in
2005 at the Hakalau Wildlife Refuge and at the Nature Conservancy Ka\u2019u
Preserve. Procedural field blanks were collected periodically during the
sampling campaign using 1L of de-ionized water.

After collection all the samples were oxidized with 1% BrCl (wt/v) and allowed
to react with the water sample in dark, refrigerated storage for a minimum of
one month. Then, the samples were analyzed for THg concentrations using cold
vapor - atomic fluorescence spectrophotometry.

For THg isotope determination the oxidized precipitation samples were
subsequently reduced, purged and trapped into 1% KMnO4 solution for isotope
analysis. The 1% KMnO4 solution was analyzed for Hg stable isotope composition
using a multiple collector inductively coupled plasma mass spectrometer.

All the methods are detailed in Motta et al., (2019).
attribute NC_GLOBAL awards_0_award_nid String 560590
attribute NC_GLOBAL awards_0_award_number String OCE-1433846
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1433846 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_0_program_manager_nid String 51467
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Mercury stable isotope values for precipitation
PI: Joel D. Blum (University of Michigan)
Co-PIs: Brian N. Popp, Kanesa Seraphin, Jeffrey C. Drazen (University of Hawaii), & Claudia Benitez-Nelson (University of South Carolina)
Version date: 21-Feb-2020
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2020-01-28T16:24:01Z
attribute NC_GLOBAL date_modified String 2020-02-24T15:41:39Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.788727.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/788727 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String ICP Mass Spec
attribute NC_GLOBAL instruments_0_dataset_instrument_description String multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS; Nu instruments)
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 788738
attribute NC_GLOBAL instruments_0_description String An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB15/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Inductively Coupled Plasma Mass Spectrometer
attribute NC_GLOBAL instruments_0_instrument_nid String 530
attribute NC_GLOBAL instruments_0_supplied_name String MC-ICP-MS
attribute NC_GLOBAL instruments_1_acronym String CVAFS
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 788741
attribute NC_GLOBAL instruments_1_description String A Cold Vapor Atomic Fluorescent Spectrophotometer (CVAFS) is an instrument used for quantitative determination of volatile heavy metals, such as mercury. CVAFS make use of the characteristic of mercury that allows vapor measurement at room temperature. Mercury atoms in an inert carrier gas are excited by a collimated UV light source at a particular wavelength. As the atoms return to their non-excited state they re-radiate their absorbed energy at the same wavelength. The fluorescence may be detected using a photomultiplier tube or UV photodiode.
attribute NC_GLOBAL instruments_1_instrument_name String Cold Vapor Atomic Fluorescence Spectrophotometer
attribute NC_GLOBAL instruments_1_instrument_nid String 692
attribute NC_GLOBAL instruments_1_supplied_name String cold vapor - atomic fluorescence spectrophotometry
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, concentration, d199, D199Hg, d200, D200Hg, d201, D201Hg, d202, d202Hg, d204, D204Hg, data, dataset, date, dmo, erddap, Location, management, oceanography, office, preliminary, sample, Sample_ID, total, Total_Hg_concentration
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/788727/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/788727 (external link)
attribute NC_GLOBAL param_mapping String {'788727': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/788727/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of Michigan
attribute NC_GLOBAL people_0_person_name String Joel D. Blum
attribute NC_GLOBAL people_0_person_nid String 560587
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String University of South Carolina
attribute NC_GLOBAL people_1_person_name String Claudia R. Benitez-Nelson
attribute NC_GLOBAL people_1_person_nid String 51092
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String University of Hawaii at Manoa
attribute NC_GLOBAL people_2_affiliation_acronym String SOEST
attribute NC_GLOBAL people_2_person_name String Jeffrey C. Drazen
attribute NC_GLOBAL people_2_person_nid String 491313
attribute NC_GLOBAL people_2_role String Co-Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
attribute NC_GLOBAL people_3_affiliation String University of Hawaii at Manoa
attribute NC_GLOBAL people_3_affiliation_acronym String SOEST
attribute NC_GLOBAL people_3_person_name String Brian N. Popp
attribute NC_GLOBAL people_3_person_nid String 51093
attribute NC_GLOBAL people_3_role String Co-Principal Investigator
attribute NC_GLOBAL people_3_role_type String originator
attribute NC_GLOBAL people_4_affiliation String University of Hawaii
attribute NC_GLOBAL people_4_person_name String Kanesa Seraphin
attribute NC_GLOBAL people_4_person_nid String 537131
attribute NC_GLOBAL people_4_role String Co-Principal Investigator
attribute NC_GLOBAL people_4_role_type String originator
attribute NC_GLOBAL people_5_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_5_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_5_person_name String Shannon Rauch
attribute NC_GLOBAL people_5_person_nid String 51498
attribute NC_GLOBAL people_5_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_5_role_type String related
attribute NC_GLOBAL project String Hg_Biogeochemistry
attribute NC_GLOBAL projects_0_acronym String Hg_Biogeochemistry
attribute NC_GLOBAL projects_0_description String NSF award abstract:
Mercury is a pervasive trace element that exists in several states in the marine environment, including monomethylmercury (MMHg), a neurotoxin that bioaccumulates in marine organisms and poses a human health threat. Understanding the fate of mercury in the ocean and resulting impacts on ocean food webs requires understanding the mechanisms controlling the depths at which mercury chemical transformations occur. Preliminary mercury analyses on nine species of marine fish from the North Pacific Ocean indicated that intermediate waters are an important entry point for MMHg into open ocean food webs. To elucidate the process controlling this, researchers will examine mercury dynamics in regions with differing vertical dissolved oxygen profiles, which should influence depths of mercury transformation. Results of the study will aid in a better understanding of the pathways by which mercury enters the marine food chain and can ultimately impact humans. This project will provide training for graduate and undergraduate students, and spread awareness on oceanic mercury through public outreach and informal science programs.
Mercury isotopic variations can provide insight into a wide variety of environmental processes. Isotopic compositions of mercury display mass-dependent fractionation (MDF) during most biotic and abiotic chemical reactions and mass-independent fractionation (MIF) during photochemical radical pair reactions. The unusual combination of MDF and MIF can provide information on reaction pathways and the biogeochemical history of mercury. Results from preliminary research provide strong evidence that net MMHg formation occurred below the surface mixed layer in the pycnocline and suggested that MMHg in low oxygen intermediate waters is an important entry point for mercury into open ocean food webs. These findings highlight the critical need to understand how MMHg levels in marine biota will respond to changes in atmospheric mercury emissions, deposition of inorganic mercury to the surface ocean, and hypothesized future expansion of oxygen minimum zones. Using field collections across ecosystems with contrasting biogeochemistry and mercury isotope fractionation experiments researchers will fill key knowledge gaps in mercury biogeochemistry. Results of the proposed research will enable scientists to assess the biogeochemical controls on where in the water column mercury methylation and demethylation likely occur.
Related background publication with supplemental data section:
Joel D. Blum, Brian N. Popp, Jeffrey C. Drazen, C. Anela Choy & Marcus W. Johnson. 2013. Methylmercury production below the mixed layer in the North Pacific Ocean. Nature Geoscience 6, 879–884. doi:10.1038/ngeo1918
attribute NC_GLOBAL projects_0_end_date String 2017-07
attribute NC_GLOBAL projects_0_geolocation String Pacific Subtropical Gyre, Station ALOHA 22.75N 158W; equatorial Pacific (10N 155W, 5N 155W)
attribute NC_GLOBAL projects_0_name String Collaborative Research: Isotopic insights to mercury in marine food webs and how it varies with ocean biogeochemistry
attribute NC_GLOBAL projects_0_project_nid String 560580
attribute NC_GLOBAL projects_0_start_date String 2014-08
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String This dataset contains the mercury stable isotope ratios collected in precipitation during R/V Kilo Moana cruises around Station ALOHA. These data were published in Motta et al., (2019) with supporting information.
attribute NC_GLOBAL title String Mercury stable isotope values for precipitation collected around Station ALOHA from 2005 to 2014
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Location   String  
attribute Location bcodmo_name String site
attribute Location description String Sampling location
attribute Location long_name String Location
attribute Location units String unitless
variable Date   String  
attribute Date bcodmo_name String date
attribute Date description String Sampling date (UTC); format: yyyymmdd
attribute Date long_name String Date
attribute Date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute Date units String unitless
variable Sample_ID   String  
attribute Sample_ID bcodmo_name String sample
attribute Sample_ID description String Sample ID
attribute Sample_ID long_name String Sample ID
attribute Sample_ID nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/ACYC/ (external link)
attribute Sample_ID units String unitless
variable Total_Hg_concentration   float  
attribute Total_Hg_concentration _FillValue float NaN
attribute Total_Hg_concentration actual_range float 2.8, 21.7
attribute Total_Hg_concentration bcodmo_name String unknown
attribute Total_Hg_concentration description String Total Hg concentration
attribute Total_Hg_concentration long_name String Total Hg Concentration
attribute Total_Hg_concentration units String nanograms per liter (ng/L)
variable d202Hg   float  
attribute d202Hg _FillValue float NaN
attribute d202Hg actual_range float -0.04, 0.2
attribute d202Hg bcodmo_name String unknown
attribute d202Hg description String Stable isotope ratio; δ202Hg
attribute d202Hg long_name String D202 HG
attribute d202Hg units String per mil (‰)
variable D199Hg   float  
attribute D199Hg _FillValue float NaN
attribute D199Hg actual_range float -0.53, -0.06
attribute D199Hg bcodmo_name String unknown
attribute D199Hg description String Stable isotope ratio; Δ199Hg
attribute D199Hg long_name String D199 HG
attribute D199Hg units String per mil (‰)
variable D201Hg   float  
attribute D201Hg _FillValue float NaN
attribute D201Hg actual_range float -0.03, 0.64
attribute D201Hg bcodmo_name String unknown
attribute D201Hg description String Stable isotope ratio; Δ201Hg
attribute D201Hg long_name String D201 HG
attribute D201Hg units String per mil (‰)
variable D200Hg   float  
attribute D200Hg _FillValue float NaN
attribute D200Hg actual_range float 0.03, 0.21
attribute D200Hg bcodmo_name String unknown
attribute D200Hg description String Stable isotope ratio; Δ200Hg
attribute D200Hg long_name String D200 HG
attribute D200Hg units String per mil (‰)
variable D204Hg   float  
attribute D204Hg _FillValue float NaN
attribute D204Hg actual_range float -0.15, 0.62
attribute D204Hg bcodmo_name String unknown
attribute D204Hg description String Stable isotope ratio; Δ204Hg
attribute D204Hg long_name String D204 HG
attribute D204Hg units String per mil (‰)

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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