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Title Sum-
Institution Dataset ID
     data   graph     files  public Amino acid compound specific isotope values for particles from R/V Kilo Moana KM1407 and
KM1418 in the Central North Pacific, Station ALOHA, Tropical Pacific, Feb and Sept. 2014
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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 Amino acid-specific stable N isotope composition was determined on samples
that were hydrolyzed, derivatized, and analyzed according to Popp et al.
(2007) and Hannides et al. (2009).\u00a0 Briefly, size-fractioned zooplankton
material and target zooplankton taxa were hydrolyzed using trace metal-grade 6
M HCl and the resulting AAs purified using cation exchange
chromatography.\u00a0 The samples were then esterified using 4:1
isopropanol:acetyl chloride and derivatized using 3:1 methylene
chloride:trifluoroacetyl anhydride.\u00a0 The resulting trifluoroacetyl and
isopropyl ester (TFA) derivatives were purified using chloroform extraction
and stored at -20\u00b0C for up to 1 month before analysis.\u00a0 This method
yielded information for the following AAs: alanine (Ala), glycine (Gly),
isoleucine (Ile), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine
(Phe), proline (Pro), serine (Ser), threonine (Thr), tyrosine (Tyr), and
valine (Val).\u00a0 During acid hydrolysis asparagine (Asn) is converted to
aspartic acid (Asp) and glutamine (Gln) is converted to glutamic acid (Glu),
thus we also report information on the combined pools, termed Asx (Asn+Asp)
and Glx (Gln+Glu), respectively.

TFA derivatives of AAs were analyzed for stable N isotope composition (d15NAA
values) following Hannides et al. (2013).\u00a0 AAs were analyzed using a
Thermo Scientific Delta V Plus IRMS interfaced to a trace gas chromatograph
(GC) fitted with a 60 m BPx5 capillary column through a GC-C III combustion
furnace (980\u00b0C), reduction furnace (680\u00b0C) and liquid nitrogen cold
trap. d15NAA values were measured on 3 \u2013 5 replicate injections with
norleucine and aminoadipic acid with known d15N values as internal reference
materials co-injected on each run.

A composite source d15NAA value was calculated by a weighted averaging a suite
of AAs (e.g., d15NSrc-AA = average of Gly, Lys, Phe, and Ser d15N values).
Weighting was based the analytical uncertainty calculated from at least
triplicate analysis of each sample.
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 Amino acids isotopes: Particle 15NsrcAA values from Station Aloha.
Published as Table S2 in Gloeckler et al (2018) L&O, doi: 10.1002/lno.10762
PI: B. Popp (UH)
version: 2018-12-05
NOTE: Delta15N values are averages weighted by error for glycine, serine, lysine and phenyalanine
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 2018-12-19T21:17:53Z
attribute NC_GLOBAL date_modified String 2019-03-18T13:39:15Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.751313.1
attribute NC_GLOBAL geospatial_vertical_max double 1195.0
attribute NC_GLOBAL geospatial_vertical_min double 25.0
attribute NC_GLOBAL geospatial_vertical_positive String down
attribute NC_GLOBAL geospatial_vertical_units String m
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/751313 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String MLVPump
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Particles were collected using in situ filtration.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 751336
attribute NC_GLOBAL instruments_0_description String The Large Volume Pumping System-WTS-LV can be one of several different models of Water Transfer Systems (WTS) Large Volume (LV) pumping systems designed and manufactured by McLane Research Labs (Falmouth, MA, USA). The WTS-LV systems are large volume in-situ filtration systems designed to collect sinking particulates. WTS-LV systems are individual in situ, battery-powered, pumping/filtration units that can be deployed at multiple depths per cast to provide information on how particle flux changes with depth. The McLane WTS-LV series of oceanographic pumps draw ambient water through filters and can pump large volumes of seawater during a single cast. The WTS-LV pumps are designed for use from a hydro-wire and employ advanced control algorithms to dynamically optimize flow rates as material accumulates on a filter.
attribute NC_GLOBAL instruments_0_instrument_name String Large Volume Pumping System-WTS-LV
attribute NC_GLOBAL instruments_0_instrument_nid String 512
attribute NC_GLOBAL instruments_1_acronym String Gas Chromatograph
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Used to analyze amino acids.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 751338
attribute NC_GLOBAL instruments_1_description String Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB02/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Gas Chromatograph
attribute NC_GLOBAL instruments_1_instrument_nid String 661
attribute NC_GLOBAL instruments_1_supplied_name String Thermo Scientific Delta V Plus IRMS
attribute NC_GLOBAL instruments_2_acronym String Ion Chromatograph
attribute NC_GLOBAL instruments_2_dataset_instrument_description String Amino acids were purified using cation exchange chromatography.
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 751337
attribute NC_GLOBAL instruments_2_description String Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. (from http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html)
attribute NC_GLOBAL instruments_2_instrument_name String Ion Chromatograph
attribute NC_GLOBAL instruments_2_instrument_nid String 662
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, comment, data, dataset, delta15, delta15N, delta15N_stdev, depth, deviation, dmo, erddap, management, oceanography, office, particle, Particle_size, preliminary, sample, size, standard, standard deviation, stdev
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/751313/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/751313 (external link)
attribute NC_GLOBAL param_mapping String {'751313': {'Depth': 'master - depth'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/751313/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of Hawaii at Manoa
attribute NC_GLOBAL people_0_affiliation_acronym String SOEST
attribute NC_GLOBAL people_0_person_name String Brian N. Popp
attribute NC_GLOBAL people_0_person_nid String 51093
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 at Columbia
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 Michigan
attribute NC_GLOBAL people_2_person_name String Joel D. Blum
attribute NC_GLOBAL people_2_person_nid String 560587
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 Jeffrey C. Drazen
attribute NC_GLOBAL people_3_person_nid String 491313
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 at Manoa
attribute NC_GLOBAL people_4_affiliation_acronym String SOEST
attribute NC_GLOBAL people_4_person_name String Cecelia Hannides
attribute NC_GLOBAL people_4_person_nid String 537126
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 University of Hawaii at Manoa
attribute NC_GLOBAL people_5_affiliation_acronym String SOEST
attribute NC_GLOBAL people_5_person_name String Kanesa Seraphin
attribute NC_GLOBAL people_5_person_nid String 537131
attribute NC_GLOBAL people_5_role String Co-Principal Investigator
attribute NC_GLOBAL people_5_role_type String originator
attribute NC_GLOBAL people_6_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_6_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_6_person_name String Nancy Copley
attribute NC_GLOBAL people_6_person_nid String 50396
attribute NC_GLOBAL people_6_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_6_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 amino acid compound specific nitrogen isotope ratios in particles collected during R/V Kilo Moana cruises around Station ALOHA (KM1407 and KM1418). For more information about the ALOHA observatory see: http://aco-ssds.soest.hawaii.edu/. These data were published in Gloeckler et al (2018), Supporting Information file lno10762-sup-0002-suppinfo2.xlsx
attribute NC_GLOBAL title String Amino acid compound specific isotope values for particles from R/V Kilo Moana KM1407 and KM1418 in the Central North Pacific, Station ALOHA, Tropical Pacific, Feb and Sept. 2014
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Particle_size   String  
attribute Particle_size bcodmo_name String diameter
attribute Particle_size description String particle size
attribute Particle_size long_name String Particle Size
attribute Particle_size units String microns
variable Sample   String  
attribute Sample bcodmo_name String sample
attribute Sample description String sample identifier
attribute Sample long_name String Sample
attribute Sample nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/ACYC/ (external link)
attribute Sample units String unitless
variable depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth _FillValue double NaN
attribute depth actual_range double 25.0, 1195.0
attribute depth axis String Z
attribute depth bcodmo_name String depth
attribute depth colorBarMaximum double 8000.0
attribute depth colorBarMinimum double -8000.0
attribute depth colorBarPalette String TopographyDepth
attribute depth description String sample depth
attribute depth ioos_category String Location
attribute depth long_name String Depth
attribute depth nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/DEPH/ (external link)
attribute depth positive String down
attribute depth standard_name String depth
attribute depth units String m
variable delta15N   float  
attribute delta15N _FillValue float NaN
attribute delta15N actual_range float -2.2, 7.0
attribute delta15N bcodmo_name String d15N
attribute delta15N description String ratio of tissue 15N:14N isotopes
attribute delta15N long_name String Delta15 N
attribute delta15N units String permil
variable delta15N_stdev   float  
attribute delta15N_stdev _FillValue float NaN
attribute delta15N_stdev actual_range float 0.0, 2.3
attribute delta15N_stdev bcodmo_name String d15N
attribute delta15N_stdev description String standard deviation of ratio of tissue 15N:14N isotopes
attribute delta15N_stdev long_name String Delta15 N Stdev
attribute delta15N_stdev units String permil
variable comment   String  
attribute comment bcodmo_name String comment
attribute comment description String comments
attribute comment long_name String Comment
attribute comment units String unitless

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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