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Title Sum-
Institution Dataset ID
     data   graph     files  public delta 15N of nitrate from R/V Knorr cruise KN199-04 & KN204-01 in the Subtropical northern
Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT 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,.odvTxt
attribute NC_GLOBAL acquisition_description String Sampling:
Full depth and super station samples were collected from the ship's rosette.
Samples were filtered through 0.8/0.45 um acropak500 filter cartridges into
triple-rinsed 60 mL HDPE bottles. Demi station samples were collected from the
GEOTRACES Go-Flo rosette. Samples were filtered through 0.2 um acropak capsule
filters into triple-rinsed 60 mL HDPE bottles. Each sample was collected in
triplicate. Samples were frozen at -20 C immediately and stored frozen until

Samples were analyzed for nitrate d15N and d18O using the denitrifier method
(Sigman et al., 2001; Casciotti, et al., 2001, with technical updates
described by McIlvin and Casciotti, 2011). Nitrate isotope reference materials
USGS32, USGS34, and USGS35 were used to calibrate d18O and USGS32 and USGS34
to calibrate d15N. Each sample was analyzed 2-6 times. Mean and standard
deviations are reported for each sample. All samples were analyzed on a
DeltaPLUS XP isotope ratio mass spectrometer, with custom-built inlet
described in McIlvin and Casciotti, 2011.

Where possible (concentrations exceeded 2 uM), samples and standards were
analyzed in 20 nanomole aliquots. When NO3- concentrations were below 2 uM,
samples were injected in maximum volume (10 mL) and calibrated using
interpolations between standard curves of 5 and 20 nano moles NO3-. Some
samples contained nitrate concentrations lower than the typical analytical
window (300 nM NO3-), but were analyzed nonetheless. Samples analyzed with
concentrations below 0.3 uM are were flagged as \"low concentration\". These
samples contained a subset with major ion peak areas (m/z 44) less than 1
volt-second, which are flagged at \"low area\". Two of these samples are
flagged as having elevated d18O-NO3 values relative to their d15N-NO3 values.
The flagged samples should be treated with caution.

This version (16 March 2013) has not been thoroughly intercalibrated with data
from the Sigman Lab. Currently, there exists no detachable d15N offset between
the datasets. However, Casciotti d18O data are approximately 0.6 permil higher
than Sigman d18O data.
attribute NC_GLOBAL awards_0_award_nid String 55172
attribute NC_GLOBAL awards_0_award_number String OCE-1138360
attribute NC_GLOBAL awards_0_data_url String http://nsf.gov/awardsearch/showAward?AWD_ID=1138360 (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 delta 15N of NO3 from GT10 and GT11
PI: Karen Casciotti (Stanford)
Co-PI: Daniel Sigman (Princeton)
Version: 29 April 2013
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 2013-04-15T20:11:39Z
attribute NC_GLOBAL date_modified String 2020-03-31T17:21:09Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.26008/1912/bco-dmo.3913.1
attribute NC_GLOBAL Easternmost_Easting double -9.6601
attribute NC_GLOBAL geospatial_lat_max double 39.7014
attribute NC_GLOBAL geospatial_lat_min double 17.3497
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -9.6601
attribute NC_GLOBAL geospatial_lon_min double -69.8644
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max double 5815.3
attribute NC_GLOBAL geospatial_vertical_min double 9.5
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/3913 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String GO-FLO
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Demi station samples were collected from the GEOTRACES GO-FLO rosette.  The U.S. GEOTRACES sampling system consisted of 24 Teflon-coated GO-FLO bottles.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 6137
attribute NC_GLOBAL instruments_0_description String GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/30/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String GO-FLO Bottle
attribute NC_GLOBAL instruments_0_instrument_nid String 411
attribute NC_GLOBAL instruments_0_supplied_name String GO-FLO Bottle
attribute NC_GLOBAL instruments_1_acronym String Niskin bottle
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 6138
attribute NC_GLOBAL instruments_1_description String A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Niskin bottle
attribute NC_GLOBAL instruments_1_instrument_nid String 413
attribute NC_GLOBAL instruments_1_supplied_name String Niskin bottle
attribute NC_GLOBAL instruments_2_acronym String IR Mass Spec
attribute NC_GLOBAL instruments_2_dataset_instrument_description String All samples were analyzed on a DeltaPLUS XP isotope ratio mass spectrometer, with custom-built inlet described in McIlvin and Casciotti, 2011.
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 6139
attribute NC_GLOBAL instruments_2_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_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB16/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String Isotope-ratio Mass Spectrometer
attribute NC_GLOBAL instruments_2_instrument_nid String 469
attribute NC_GLOBAL instruments_2_supplied_name String Isotope-ratio Mass Spectrometer
attribute NC_GLOBAL keywords String area, bco, bco-dmo, biological, bottle, bottle_GEOTRC, btl, BTL_ISO_DateTime_UTC, cast, cast_GEOTRC, chemical, chemistry, conc, concentration, cruise, cruise_id, d15, d15N_NO3, d15N_NO3_sd, data, dataset, date, day, day_gmt, depth, depth_GEOTRC_CTD, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, erddap, event, event_GEOTRC, flag, flag_low_area, flag_low_conc, geotrc, iso, latitude, longitude, low, management, mole, mole_concentration_of_nitrate_in_sea_water, month, month_gmt, n02, nitrate, no3, ocean, oceanography, oceans, office, preliminary, press, sample, sample_bottle_GEOTRC, sample_GEOTRC, science, sea, seawater, station, station_GEOTRC, time, time_gmt, water, year
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/3913/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/3913 (external link)
attribute NC_GLOBAL Northernmost_Northing double 39.7014
attribute NC_GLOBAL param_mapping String {'3913': {'depth_GEOTRC_CTD': 'flag - depth', 'lat': 'flag - latitude', 'BTL_ISO_DateTime_UTC': 'flag - time', 'lon': 'flag - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/3913/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 Princeton University
attribute NC_GLOBAL people_1_person_name String Daniel M. Sigman
attribute NC_GLOBAL people_1_person_nid String 51417
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 Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_2_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_2_person_name String Shannon Rauch
attribute NC_GLOBAL people_2_person_nid String 51498
attribute NC_GLOBAL people_2_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL project String U.S. GEOTRACES NAT
attribute NC_GLOBAL projects_0_acronym String U.S. GEOTRACES NAT
attribute NC_GLOBAL projects_0_description String Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office.
The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the "origin" of the global Meridional Overturning Circulation.
It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these "exotic" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the "fulldepth TEI" stations, and constitute approximately half of the stations to be ultimately occupied.
Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version]
Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.
The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2).
KN199-04 Cruise Report (PDF)
Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010.  The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version]
The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3).
KN204-01A,B Cruise Report (PDF)
Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011.  [click on the image to view a larger version]
Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials
ADCP data are available from the Currents ADCP group at the University of Hawaii at the links below:KN199-04   (leg 1 of 2010 cruise; Lisbon to Cape Verde)KN199-05   (leg 2 of 2010 cruise; Cape Verde to Charleston, NC)KN204-01A (part 1 of 2011 cruise; Woods Hole, MA to Bermuda)KN204-01B (part 2 of 2011 cruise; Bermuda to Cape Verde)
attribute NC_GLOBAL projects_0_end_date String 2013-08
attribute NC_GLOBAL projects_0_geolocation String Subtropical western and eastern North Atlantic Ocean
attribute NC_GLOBAL projects_0_name String U.S. GEOTRACES North Atlantic Transect
attribute NC_GLOBAL projects_0_project_nid String 2066
attribute NC_GLOBAL projects_0_project_website String http://www.geotraces.org/ (external link)
attribute NC_GLOBAL projects_0_start_date String 2010-10
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 17.3497
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String Dataset includes delta 15N of nitrate (NO3) measurements from the GT10 and GT11 (KN199-04 and KN204-01) U.S. GEOTRACES North Atlantic Transect cruises.
attribute NC_GLOBAL time_coverage_start String 2010-10-16T02:28:00Z
attribute NC_GLOBAL title String delta 15N of nitrate from R/V Knorr cruise KN199-04 & KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -69.8644
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 e.g. KN199-04 = R/V Knorr cruise number 199-04.
attribute cruise_id long_name String Cruise Id
attribute cruise_id units String text
variable year   short  
attribute year _FillValue short 32767
attribute year actual_range short 2010, 2011
attribute year bcodmo_name String year
attribute year description String 4-digit year. in the format YYYY
attribute year long_name String Year
attribute year nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/ (external link)
attribute year units String unitless
variable station_GEOTRC   byte  
attribute station_GEOTRC _FillValue byte 127
attribute station_GEOTRC actual_range byte 1, 24
attribute station_GEOTRC bcodmo_name String station
attribute station_GEOTRC description String GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. PI-supplied values were identical to those in the intermediate
US GEOTRACES master file. Originally submitted as 'Station', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute station_GEOTRC long_name String Station GEOTRC
attribute station_GEOTRC units String dimensionless
variable depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth _FillValue double NaN
attribute depth actual_range double 9.5, 5815.3
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 Observation/sample depth in meters, calculated from CTD pressure. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'CTD Depth', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
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 press   float  
attribute press _FillValue float NaN
attribute press actual_range float 9.6, 5958.6
attribute press bcodmo_name String pressure
attribute press description String Pressure (dbars) from CTD.
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
variable event_GEOTRC   short  
attribute event_GEOTRC _FillValue short 32767
attribute event_GEOTRC actual_range short 2008, 3281
attribute event_GEOTRC bcodmo_name String event
attribute event_GEOTRC description String Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. PI-supplied values were identical to those in the intermediate
US GEOTRACES master file. Originally submitted as 'Event number', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute event_GEOTRC long_name String Event GEOTRC
attribute event_GEOTRC nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/ (external link)
attribute event_GEOTRC units String dimensionless
variable cast_GEOTRC   byte  
attribute cast_GEOTRC _FillValue byte 127
attribute cast_GEOTRC actual_range byte 1, 9
attribute cast_GEOTRC bcodmo_name String cast
attribute cast_GEOTRC description String Cast identifier, numbered consecutively within a station. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Cast', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute cast_GEOTRC long_name String Cast GEOTRC
attribute cast_GEOTRC units String dimensionless
variable sample_GEOTRC   short  
attribute sample_GEOTRC _FillValue short 32767
attribute sample_GEOTRC actual_range short 5075, 8140
attribute sample_GEOTRC bcodmo_name String sample
attribute sample_GEOTRC description String Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'GEOTRACES ID', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute sample_GEOTRC long_name String Sample GEOTRC
attribute sample_GEOTRC nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/ACYC/ (external link)
attribute sample_GEOTRC units String dimensionless
variable sample_bottle_GEOTRC   byte  
attribute sample_bottle_GEOTRC _FillValue byte 127
attribute sample_bottle_GEOTRC actual_range byte 1, 23
attribute sample_bottle_GEOTRC bcodmo_name String bot_Nis
attribute sample_bottle_GEOTRC description String Unique identification numbers given to samples taken from bottles; rangies from 1 to 24; often used synonymously with bottle number. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'Sample #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute sample_bottle_GEOTRC long_name String Sample Bottle GEOTRC
attribute sample_bottle_GEOTRC units String dimensionless
variable bottle_GEOTRC   String  
attribute bottle_GEOTRC bcodmo_name String bottle
attribute bottle_GEOTRC description String Alphanumeric characters identifying bottle type (e.g., NIS representing Niskin and GF representing GOFLO) and position on a CTD rosette. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Bottle number', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
attribute bottle_GEOTRC long_name String Bottle GEOTRC
attribute bottle_GEOTRC units String dimensionless
variable month_gmt   byte  
attribute month_gmt _FillValue byte 127
attribute month_gmt actual_range byte 10, 12
attribute month_gmt bcodmo_name String month_gmt
attribute month_gmt description String 2-digit month of year (GMT). in the format mm (01 to 12)
attribute month_gmt long_name String Month Gmt
attribute month_gmt units String unitless
variable day_gmt   String  
attribute day_gmt bcodmo_name String day_gmt
attribute day_gmt description String 2-digit day of month (GMT). in the format dd (01 to 31)
attribute day_gmt long_name String Day Gmt
attribute day_gmt units String unitless
variable time_gmt   String  
attribute time_gmt bcodmo_name String time_gmt
attribute time_gmt description String Time (GMT) in hours and minutes when the event occurred; 24-hour clock. in the format HHMM
attribute time_gmt long_name String Time Gmt
attribute time_gmt units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 17.3497, 39.7014
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 in decimal degrees. North = 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 -69.8644, -9.6601
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 in decimal degrees. West = Negative.
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 d15N_NO3   float  
attribute d15N_NO3 _FillValue float NaN
attribute d15N_NO3 actual_range float 2.22, 14.58
attribute d15N_NO3 bcodmo_name String dN15_NO3
attribute d15N_NO3 colorBarMaximum double 50.0
attribute d15N_NO3 colorBarMinimum double 0.0
attribute d15N_NO3 description String Nitrate delta 15N, reported in units of permil vs. atmospheric N2.
attribute d15N_NO3 long_name String Mole Concentration Of Nitrate In Sea Water
attribute d15N_NO3 units String per mil
variable d15N_NO3_sd   float  
attribute d15N_NO3_sd _FillValue float NaN
attribute d15N_NO3_sd actual_range float 0.0, 1.75
attribute d15N_NO3_sd bcodmo_name String standard deviation
attribute d15N_NO3_sd colorBarMaximum double 50.0
attribute d15N_NO3_sd colorBarMinimum double 0.0
attribute d15N_NO3_sd description String Standard deviation of d15N_NO3.
attribute d15N_NO3_sd long_name String D15 N NO3 Sd
attribute d15N_NO3_sd units String per mil
variable n   byte  
attribute n _FillValue byte 127
attribute n actual_range byte 2, 6
attribute n bcodmo_name String numb_obs
attribute n description String n; number of observations/measurements.
attribute n long_name String N
attribute n units String dimensionless
variable flag_low_area   String  
attribute flag_low_area bcodmo_name String q_flag
attribute flag_low_area description String Samples that contained major ion peak areas (m/z 44) less than 1 volt-second are flagged at "low area". The flagged samples should be treated with caution.
attribute flag_low_area long_name String Flag Low Area
attribute flag_low_area units String dimensionless
variable flag_low_conc   String  
attribute flag_low_conc bcodmo_name String q_flag
attribute flag_low_conc description String Samples analyzed with concentrations below 0.3 uM are were flagged as "low concentration". The flagged samples should be treated with caution.
attribute flag_low_conc long_name String Flag Low Conc
attribute flag_low_conc units String dimensionless
variable ISO_DateTime_UTC   String  
attribute ISO_DateTime_UTC bcodmo_name String ISO_DateTime_UTC
attribute ISO_DateTime_UTC description String Date/Time (UTC) of the cast formatted to the ISO8601 standard. T indicates start of time string; Z indicates UTC. in the format YYYY-mm-ddTHH:MM:SS.ssZ
attribute ISO_DateTime_UTC long_name String ISO Date Time UTC
attribute ISO_DateTime_UTC nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/ (external link)
attribute ISO_DateTime_UTC source_name String ISO_DateTime_UTC
attribute ISO_DateTime_UTC time_precision String 1970-01-01T00:00:00.00Z
attribute ISO_DateTime_UTC units String unitless
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.28719608E9, NaN
attribute time axis String T
attribute time bcodmo_name String ISO_DateTime_UTC
attribute time description String Date and time (UTC) that the bottle was fired, in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description). This standard is based on
ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)
attribute time ioos_category String Time
attribute time long_name String BTL ISO Date Time UTC
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/ (external link)
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z

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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