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Title Sum-
Institution Dataset ID
   set  data   graph     files  public Dissolved N2O concentration and stable isotope/isotopomer composition measurements from R/V
Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in
2007 (CoFeMUG project)
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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,.esriCsv,.geoJson
attribute NC_GLOBAL acquisition_description String Single water samples for N2O analyses were collected from acid-cleaned,
Teflon-coated X-Niskin sampling bottles (OceanTest Equipment) of 8-liter
capacity deployed on an epoxy-coated rosette (Sea-Bird Electronics) as
described in Noble et al. (2012). Immediately after rosette recovery, water
samples were collected by twice overfilling 160 ml glass serum bottles
(Wheaton prod. no. 223748) from the bottom up using tygon tubing attached to
each niskin bottle. A small headspace was introduced into each sample by
pipetting 1 ml of sample off the top. The sample was then poisoned with 100 ul
of saturated HgCl2 solution and sealed with gray butyl septa (MicroLiter
Analytics prod. no. 20-0025) and aluminum crimps. Poisoned samples were stored
for several months in the dark at room temperature before analysis.

Isotopic analyses of N2O were made using a Finnigan DELTA PLUS XP IRMS
calibrated for isotopomer-specific measurements (see Frame & Casciotti (2010)
for details) and referenced against injections of a calibrated N2O reference
tank (d15Nbulk = 0.31\u2030, SP = -1.2\u2030, d18O = 40.85\u2030 as calibrated
by S. Toyoda, Toykyo Tech) with quality control checks against analyses of
tropospheric air samples. Bottles were purged with He and N2O was trapped on-
line with a custom-built purge and trap system (McIlvin & Casciotti, 2010).
The molar amount of N2O was determined from each bottle using a constant
linear relationship of m/z 44 peak area to molar quantity of N2O which is 2.15
Vs per nanomole of N2O, then converted to a concentration by dividing the
molar amount by the volume of sample extracted (154 ml). The ratios of sample
N2O to reference gas N2O values of m/z 31/30, 45/44, and 46/44 were corrected
for a small linear dependence of these values on the sample peak area (see
McIlvin and Casciotti 2010), with all ratios corrected to a peak area of 20
Vs. For a 160 ml water sample containing 2.2 nmole of N2O (typical of the
lowest concentrations in this dataset), the precision of the d18O =
\u00b10.25\u2030, d15Nbulk = \u00b10.09\u2030, and SP = \u00b10.33\u2030.
Additional details about measurement precision are included in McIlvin &
Casciotti (2010). Triplicate samples of tropospheric N2O from Woods Hole, MA
had _d15Na = 15.0 \u00b1 0.1\u2030, _d15Nb = \u22121.9 \u00b1 0.1\u2030, d_18O
= 44.4 \u00b1 0.2\u2030, _d15Nbulk = 6.5 \u00b1 0.1\u2030, SP = 16.9 \u00b1
0.1\u2030, and m/z 44 peak area = 15.6 \u00b1 0.2 Vs. All cruise data are
included here except two measurements with background interference.
attribute NC_GLOBAL awards_0_award_nid String 54681
attribute NC_GLOBAL awards_0_award_number String OCE-0452883
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0452883 (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 awards_1_award_nid String 55017
attribute NC_GLOBAL awards_1_award_number String OCE-1031271
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1031271 (external link)
attribute NC_GLOBAL awards_1_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_1_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_1_funding_source_nid String 355
attribute NC_GLOBAL awards_1_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_1_program_manager_nid String 51467
attribute NC_GLOBAL awards_2_award_nid String 55159
attribute NC_GLOBAL awards_2_award_number String OCE-0928414
attribute NC_GLOBAL awards_2_data_url String http://nsf.gov/awardsearch/showAward?AWD_ID=0928414&HistoricalAwards=false (external link)
attribute NC_GLOBAL awards_2_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_2_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_2_funding_source_nid String 355
attribute NC_GLOBAL awards_2_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_2_program_manager_nid String 51467
attribute NC_GLOBAL awards_3_award_nid String 529604
attribute NC_GLOBAL awards_3_award_number String OCE-0752291
attribute NC_GLOBAL awards_3_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=0752291 (external link)
attribute NC_GLOBAL awards_3_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_3_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_3_funding_source_nid String 355
attribute NC_GLOBAL awards_3_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_3_program_manager_nid String 51467
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Dissolved nitrous oxide and stable isotopes/isotopomers
CoFeMUG cruise KN192-05
PI: Karen Casciotti (Stanford)
Co-PI: Caitlin Frame (University of Basel)
Version: 17 Sept 2014
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 2014-10-03T15:33:32Z
attribute NC_GLOBAL date_modified String 2020-03-31T17:27:18Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.26008/1912/bco-dmo.529599.1
attribute NC_GLOBAL Easternmost_Easting double 14.5
attribute NC_GLOBAL geospatial_lat_max double -12.0
attribute NC_GLOBAL geospatial_lat_min double -25.0
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 14.5
attribute NC_GLOBAL geospatial_lon_min double -20.0
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/529599 (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 Isotopic analyses of N2O were made using a Finnigan DELTA PLUS XP IRMS calibrated for isotopomer-specific measurements; see Frame & Casciotti (2010) for details.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 529615
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 Finnigan DELTA PLUS XP IRMS
attribute NC_GLOBAL instruments_1_acronym String TM Bottle
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Single water samples for N2O analyses were collected from acid-cleaned, Teflon-coated X-Niskin sampling bottles (OceanTest Equipment) of 8-liter capacity deployed on an epoxy-coated rosette (Sea-Bird Electronics).
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 529614
attribute NC_GLOBAL instruments_1_description String Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/30/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Trace Metal Bottle
attribute NC_GLOBAL instruments_1_instrument_nid String 493
attribute NC_GLOBAL instruments_1_supplied_name String Teflon-coated X-Niskin sampling bottles (Ocean Test Equipment)
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, code, cruise, cruise_id, d15, d15Na_N2O, d15Nb_N2O, d15Nbulk_N2O, d18, d18O_N2O, data, dataset, date, date_event, dmo, erddap, ev_code, event, latitude, lon_360, longitude, management, N2O, nbulk, oceanography, office, preliminary, press, SP_N2O, sta
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/529599/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/529599 (external link)
attribute NC_GLOBAL Northernmost_Northing double -12.0
attribute NC_GLOBAL param_mapping String {'529599': {'lat': 'flag - latitude', 'press': 'flag - depth', 'lon': 'flag - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/529599/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Stanford University
attribute NC_GLOBAL people_0_person_name String Karen L. Casciotti
attribute NC_GLOBAL people_0_person_nid String 50980
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 Basel (Universitat Basel)
attribute NC_GLOBAL people_1_person_name String Caitlin Frame
attribute NC_GLOBAL people_1_person_nid String 529608
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 Stanford University
attribute NC_GLOBAL people_2_person_name String Karen L. Casciotti
attribute NC_GLOBAL people_2_person_nid String 50980
attribute NC_GLOBAL people_2_role String Contact
attribute NC_GLOBAL people_2_role_type String related
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 Shannon Rauch
attribute NC_GLOBAL people_3_person_nid String 51498
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 CoFeMUG
attribute NC_GLOBAL projects_0_acronym String CoFeMUG
attribute NC_GLOBAL projects_0_description String The geochemistries of dissolved cobalt (Co) and iron (Fe) in the oceanic water column share several characteristics such as extremely low concentrations, redox chemistry, low solubility,and utilization as micronutrients by marine microbes. Iron has been the subject of considerable research focus in recent years due to its role in limiting phytoplankton productivity in oceanic and coastal upwelling environments. Cobalt has been much less studied, but recent data show it may be important in influencing primary productivity or phytoplankton community composition in certain geographical areas.
The CoFeMUG project predated GEOTRACES, so while it is not formally recognized as a GEOTRACES section, it is considered a GEOTRACES-related project and the CoFeMUG data are GEOTRACES compliant.
State-of-the-art geochemical and molecular biological techniques were used to address biogeochemical questions in the South Atlantic, and focus especially on the two trace metals, cobalt and iron. The 27-day cruise in November and December 2007 to the South Atlantic was designed to study cobalt and iron biogeochemistry and focus on four major hypotheses.
(1) Large fluxes of labile cobalt are associated with upwelling systems even in Aeolian dominated environments.
(2) Cobalt and phosphate show correlations in (and only in) surface waters due to micronutrient utilization and rapid remineralization. The slope of the correlation is dependent on the chemical speciation of cobalt.
(3) The absence of Trichodesmium populations in the subtropical and tropical South Atlantic is caused by iron limitation.
(4) Based on work from the California and Peru Upwelling regimes, primary productivity in the Benguela upwelling regime off of South West Africa may be iron limited or iron-cobalt colimited.
A combination of geochemical and biological/molecular analyses were made across an oligotrophic-upwelling transition to examine how changing metal regimes affect the physiology and growth of the important primary producers Trichodesmium and Synechococcus.
CoFeMUG project results are published in:
Noble, Abigail E., Carl H. Lamborg, Dan C. Ohnemus, Phoebe J. Lam, Tyler J. Goepfert, Chris I. Measures, Caitlin H. Frame, Karen L. Casciotti, Giacomo R. DiTullio, Joe Jennings, and Mak A. Saito (2012) Basin-scale inputs of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean. Limnology & Oceanography. Vol. 57(4), July 2012. pgs 989-1010. doi:10.4319/lo.2012.57.4.0989 (www.aslo.org/lo/toc/vol_57/issue_4/0989.pdf)
attribute NC_GLOBAL projects_0_end_date String 2008-03
attribute NC_GLOBAL projects_0_geolocation String South Atlantic subtropical gyre and Benguela upwelling region
attribute NC_GLOBAL projects_0_name String Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre
attribute NC_GLOBAL projects_0_project_nid String 2067
attribute NC_GLOBAL projects_0_start_date String 2005-03
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 Southernmost_Northing double -25.0
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String cruise_id
attribute NC_GLOBAL summary String Dissolved N2O concentration and stable isotope/isotopomer composition measurements made from samples from acid-cleaned, Teflon-coated X-Niskin sampling bottles on the CoFeMUG cruise (KN192-05).
attribute NC_GLOBAL title String Dissolved N2O concentration and stable isotope/isotopomer composition measurements from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -20.0
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable cruise_id   String  
attribute cruise_id bcodmo_name String cruise_id
attribute cruise_id description String Official cruise identifier.
attribute cruise_id long_name String Cruise Id
attribute cruise_id units String dimensionless
variable sta   byte  
attribute sta _FillValue byte 127
attribute sta actual_range byte 5, 27
attribute sta bcodmo_name String sta
attribute sta description String Station number.
attribute sta long_name String Sta
attribute sta units String dimensionless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double -25.0, -12.0
attribute latitude axis String Y
attribute latitude bcodmo_name String latitude
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String Latitude; North is positive.
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -20.0, 14.5
attribute longitude axis String X
attribute longitude bcodmo_name String longitude
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String Longitude; East is positive. Calculated by BCO-DMO from the original PI-provided lon_360 values.
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable lon_360   float  
attribute lon_360 _FillValue float NaN
attribute lon_360 actual_range float 0.0, 357.5
attribute lon_360 bcodmo_name String lon_360
attribute lon_360 colorBarMaximum double 180.0
attribute lon_360 colorBarMinimum double -180.0
attribute lon_360 description String Longitude measured from 0 to 360 degrees.
attribute lon_360 long_name String Longitude
attribute lon_360 standard_name String longitude
attribute lon_360 units String decimal degrees
variable press   double  
attribute press _FillValue double NaN
attribute press actual_range double 9.0, 5106.0
attribute press bcodmo_name String pressure
attribute press description String Pressure.
attribute press long_name String Press
attribute press nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/ (external link)
attribute press units String decibars (db)
variable ev_code   String  
attribute ev_code bcodmo_name String event code
attribute ev_code description String Event code; type and number of sampling event; matches cruise event log.
attribute ev_code long_name String Ev Code
attribute ev_code units String dimensionless
variable event   int  
attribute event _FillValue int 2147483647
attribute event actual_range int 11220908, 12111150
attribute event bcodmo_name String event
attribute event description String Event number from the cruise event log.
attribute event long_name String Event
attribute event nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/ (external link)
attribute event units String dimensionless
variable date_event   int  
attribute date_event _FillValue int 2147483647
attribute date_event actual_range int 20071122, 20071211
attribute date_event bcodmo_name String date
attribute date_event description String Year-month-day of the event; added by BCO-DMO from the cruise event log. in the format YYYYmmdd
attribute date_event long_name String Date Event
attribute date_event nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute date_event units String unitless
variable N2O   float  
attribute N2O _FillValue float NaN
attribute N2O actual_range float 6.8, 49.3
attribute N2O bcodmo_name String Nitrous Oxide
attribute N2O description String Dissolved N2O concentration.
attribute N2O long_name String N2 O
attribute N2O units String nanomoles per liter (nm/L)
variable d15Nbulk_N2O   float  
attribute d15Nbulk_N2O _FillValue float NaN
attribute d15Nbulk_N2O actual_range float -0.1, 9.1
attribute d15Nbulk_N2O bcodmo_name String unknown
attribute d15Nbulk_N2O description String d15Nbulk-N2O = average (bulk) isotope ratio (15N/14N) of both nitrogen atoms in N2O. Calculated as d15Nbulk-N2O = (d15Na-N2O + d15Nb-N2O)/2; referenced to atmospheric N2.
attribute d15Nbulk_N2O long_name String D15 Nbulk N2 O
attribute d15Nbulk_N2O units String per mil (‰)
variable SP_N2O   float  
attribute SP_N2O _FillValue float NaN
attribute SP_N2O actual_range float 5.3, 25.2
attribute SP_N2O bcodmo_name String unknown
attribute SP_N2O description String SP-N2O = site preference of 15N in N2O. Calculated as (d15Na-N2O - d15Nb-N2O); the difference between d15Na-N2O and d15Nb-N2O.
attribute SP_N2O long_name String SP N2 O
attribute SP_N2O units String per mil (‰)
variable d18O_N2O   float  
attribute d18O_N2O _FillValue float NaN
attribute d18O_N2O actual_range float 37.5, 52.2
attribute d18O_N2O bcodmo_name String unknown
attribute d18O_N2O description String d18O-N2O = isotope ratio (18O/16O) of oxygen in N2O. Calculated as d18O = ({[18O]/[16O]sample}/{[18O]/[16O]standard} -1) x 1000‰; referenced to VSMOW.
attribute d18O_N2O long_name String D18 O N2 O
attribute d18O_N2O units String per mil (‰)
variable d15Na_N2O   float  
attribute d15Na_N2O _FillValue float NaN
attribute d15Na_N2O actual_range float 6.1, 19.8
attribute d15Na_N2O bcodmo_name String unknown
attribute d15Na_N2O description String d15Na-N2O = isotope ratio (15N/14N) in the internal nitrogen of N2O; d15Na-N2O = ({[15N]/[14N]a,sample}/{[15N]/[14N]a,standard} -1) x 1000‰; referenced to atmospheric N2 as the standard.
attribute d15Na_N2O long_name String D15 Na N2 O
attribute d15Na_N2O units String per mil (‰)
variable d15Nb_N2O   float  
attribute d15Nb_N2O _FillValue float NaN
attribute d15Nb_N2O actual_range float -9.5, 2.1
attribute d15Nb_N2O bcodmo_name String unknown
attribute d15Nb_N2O description String d15Nb-N2O = isotope ratio (15N/14N) in the external nitrogen of N2O; d15Nb-N2O = ({[15N]/[14N]b,sample}/{[15N]/[14N]b,standard} -1) x 1000‰; referenced to atmospheric N2 as the standard.
attribute d15Nb_N2O long_name String D15 Nb N2 O
attribute d15Nb_N2O 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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