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Title Sum-
Institution Dataset ID
     data   graph     files  public Test of potential mass to charge 30 interferences from O2    ?     I   M   background (external link) RSS Subscribe BCO-DMO bcodmo_dataset_778083

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 The measurements presented here were conducted with a MIMS and an IRMS each
equipped with high-temperature copper reduction columns to scrub O2 from the
gas stream entering the source. However, samples measured in parallel on the
IRMS and on the MIMS without the O2 scrubbing column yielded similar 15N atom
% values, indicating that any NO+ generated in the respective IRMS and MIMS
sources was insufficient to alter the 15N atom % significantly in the range
pertinent to 15N2 tracer incubations.
attribute NC_GLOBAL awards_0_award_nid String 772538
attribute NC_GLOBAL awards_0_award_number String OCE-1732246
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1732246 (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 Henrietta N Edmonds
attribute NC_GLOBAL awards_0_program_manager_nid String 51517
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Test of potential m/z 30 interferences from O2
PI: Julie Granger
Version: 2019-09-30
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 2019-09-30T16:01:58Z
attribute NC_GLOBAL date_modified String 2019-10-02T18:50:00Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.778083.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/778083 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String IR Mass Spec
attribute NC_GLOBAL instruments_0_dataset_instrument_description String continuous flow Delta V Isotope Ratio Mass Spectrometer (Smith et al. 2015), and continuous flow-GV Isoprime IRMS (Charoenpong et al., 2014)
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 778091
attribute NC_GLOBAL instruments_0_description String The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB16/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Isotope-ratio Mass Spectrometer
attribute NC_GLOBAL instruments_0_instrument_nid String 469
attribute NC_GLOBAL instruments_0_supplied_name String Isotope Ratio Mass Spectrometer
attribute NC_GLOBAL instruments_1_acronym String MIMS
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Membrane Inlet Mass Spectrometer (Bay Instruments)
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 778090
attribute NC_GLOBAL instruments_1_description String Membrane-introduction mass spectrometry (MIMS) is a method of introducing analytes into the mass spectrometer's vacuum chamber via a semipermeable membrane.
attribute NC_GLOBAL instruments_1_instrument_name String Membrane Inlet Mass Spectrometer
attribute NC_GLOBAL instruments_1_instrument_nid String 661606
attribute NC_GLOBAL instruments_1_supplied_name String Membrane Inlet Mass Spectrometer
attribute NC_GLOBAL keywords String 15n, analysis, atom, atom_pcnt_15n, bco, bco-dmo, biological, chemical, data, dataset, dmo, erddap, m_z_28, m_z_29, m_z_30, m_z_32, m_z_40, management, N2_Ar, notes, oceanography, office, pcnt, preliminary, ratio, ratio_28_29, ratio_28_30, sample, time, Time_of_analysis
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/778083/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/778083 (external link)
attribute NC_GLOBAL param_mapping String {'778083': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/778083/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of Connecticut
attribute NC_GLOBAL people_0_affiliation_acronym String UConn
attribute NC_GLOBAL people_0_person_name String Julie Granger
attribute NC_GLOBAL people_0_person_nid String 528937
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 Massachusetts Dartmouth
attribute NC_GLOBAL people_1_affiliation_acronym String UMass Dartmouth
attribute NC_GLOBAL people_1_person_name String Annie Bourbonnais
attribute NC_GLOBAL people_1_person_nid String 778011
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
attribute NC_GLOBAL people_2_person_name String Samuel Wilson
attribute NC_GLOBAL people_2_person_nid String 51733
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 Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Mathew Biddle
attribute NC_GLOBAL people_3_person_nid String 708682
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String EAGER NitFix
attribute NC_GLOBAL projects_0_acronym String EAGER NitFix
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:
The availability of nitrogen is required to support the growth and production of organisms living in the surface of our global ocean. This element can be scarce. To alleviate this scarcity, a special class of bacteria and archaea, called nitrogen fixers, can derive the nitrogen needed for growth from nitrogen gas. This project would carefully examine one specific method for measuring nitrogen fixation that has been used recently to suggest the occurrence of small amounts of nitrogen fixation in subsurface ocean waters. If these reports are verified, then a revision of our understanding of the marine nitrogen cycle may be needed. The Ocean Carbon and Biogeochemistry program will be used as a platform to develop community consensus for best practices in nitrogen fixation measurements and detection of diversity, activity, and abundances of the organisms responsible. In addition, a session will be organized in a future national/international conference to communicate with the broader scientific community while developing these best practices.
The goal of this study is to conduct a thorough examination of potential experimental and analytical errors inherent to the 15N2-tracer nitrogen fixation method, in tandem with comprehensive molecular measurements, in mesopelagic ocean waters. Samples will be collected and experimental work conducted on a cruise transect in the North Atlantic Ocean, followed by analytical work in the laboratory. The specific aims of this study are to (1) determine the minimum quantifiable rates of 15N2 fixation based on incubations of mesopelagic waters via characterization of sources of experimental and analytical error, and (2) seek evidence of presence and expression of nitrogen fixation genes via comprehensive molecular approaches on corresponding samples. The range of detectable rates and diazotroph activity from the measurements made in this study will be informative for the understanding of the importance of nitrogen fixation in the oceanic nitrogen budget.
attribute NC_GLOBAL projects_0_end_date String 2018-10
attribute NC_GLOBAL projects_0_geolocation String North Atlantic Ocean, Pacific Ocean
attribute NC_GLOBAL projects_0_name String EAGER: Collaborative Research: Detection limit in marine nitrogen fixation measurements - Constraints of rates from the mesopelagic ocean
attribute NC_GLOBAL projects_0_project_nid String 772534
attribute NC_GLOBAL projects_0_start_date String 2017-05
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 Molecular oxygen (O2) has been documented to ionize partially to NO+ in mass spectrometer sources, generating a signal that overlaps with that of 15N2 (mass-to-charge of 30). Here, we tested whether O2 needs to be specifically removed from the sample streams of the Membrane Inlet Mass Spectrometer and the Isotope Ratio Mass Spectrometer in order to properly quantitate 15N2 atom% at pertinent concentrations. Sample streams with and without O2 yielded similar signals, suggesting that O2 does not interfere with the 15N2 atom% measurements in the experimental range with the given instruments.
attribute NC_GLOBAL title String Test of potential mass to charge 30 interferences from O2
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Sample   String  
attribute Sample bcodmo_name String unknown
attribute Sample description String sample
attribute Sample long_name String Sample
attribute Sample units String unitless
variable Time_of_analysis   String  
attribute Time_of_analysis bcodmo_name String unknown
attribute Time_of_analysis description String time the analysis was conducted in 24 hour format
attribute Time_of_analysis long_name String Time Of Analysis
attribute Time_of_analysis units String unitless
variable m_z_28   double  
attribute m_z_28 _FillValue double NaN
attribute m_z_28 actual_range double 2.294674E-8, 0.2814767477465812
attribute m_z_28 bcodmo_name String unknown
attribute m_z_28 description String mass-to-charge
attribute m_z_28 long_name String M Z 28
attribute m_z_28 units String unitless
variable m_z_29   double  
attribute m_z_29 _FillValue double NaN
attribute m_z_29 actual_range double 1.727269E-10, 0.4483016055663997
attribute m_z_29 bcodmo_name String unknown
attribute m_z_29 description String mass-to-charge
attribute m_z_29 long_name String M Z 29
attribute m_z_29 units String unitless
variable m_z_30   double  
attribute m_z_30 _FillValue double NaN
attribute m_z_30 actual_range double 4.788455E-12, 0.6846958467871429
attribute m_z_30 bcodmo_name String unknown
attribute m_z_30 description String mass-to-charge
attribute m_z_30 long_name String M Z 30
attribute m_z_30 units String unitless
variable m_z_32   double  
attribute m_z_32 _FillValue double NaN
attribute m_z_32 actual_range double 1.205668E-11, 0.27314851061155104
attribute m_z_32 bcodmo_name String unknown
attribute m_z_32 description String mass-to-charge
attribute m_z_32 long_name String M Z 32
attribute m_z_32 units String unitless
variable m_z_40   double  
attribute m_z_40 _FillValue double NaN
attribute m_z_40 actual_range double 5.9915E-10, 0.2542875061786004
attribute m_z_40 bcodmo_name String unknown
attribute m_z_40 description String mass-to-charge
attribute m_z_40 long_name String M Z 40
attribute m_z_40 units String unitless
variable N2_Ar   double  
attribute N2_Ar _FillValue double NaN
attribute N2_Ar actual_range double 0.030372135407174074, 38.33405
attribute N2_Ar bcodmo_name String unknown
attribute N2_Ar description String N2/Ar ratio
attribute N2_Ar long_name String N2 Ar
attribute N2_Ar units String unitless
variable ratio_28_29   float  
attribute ratio_28_29 _FillValue float NaN
attribute ratio_28_29 actual_range float 130.6803, 132.8498
attribute ratio_28_29 bcodmo_name String unknown
attribute ratio_28_29 description String 28/29 ratio
attribute ratio_28_29 long_name String Ratio 28 29
attribute ratio_28_29 units String unitless
variable ratio_28_30   float  
attribute ratio_28_30 _FillValue float NaN
attribute ratio_28_30 actual_range float 9.092828, 4823.516
attribute ratio_28_30 bcodmo_name String unknown
attribute ratio_28_30 description String 28/30 ratio
attribute ratio_28_30 long_name String Ratio 28 30
attribute ratio_28_30 units String unitless
variable atom_pcnt_15n   double  
attribute atom_pcnt_15n _FillValue double NaN
attribute atom_pcnt_15n actual_range double 0.39471140788488707, 10.18249548891134
attribute atom_pcnt_15n bcodmo_name String unknown
attribute atom_pcnt_15n description String 15 N atom %
attribute atom_pcnt_15n long_name String Atom Pcnt 15n
attribute atom_pcnt_15n units String unitless
variable Notes   String  
attribute Notes bcodmo_name String unknown
attribute Notes description String additional comments
attribute Notes long_name String Notes
attribute Notes 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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