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Title Sum-
Institution Dataset ID
   set  data   graph     files  public Water column nitrate+nitrite d15N and d18O and total dissolved nitrogen d15N measurements
from R/V Ka`imikai-O-Kanaloa cruise KOK1806 (HOT LAVA) in July 2018
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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 Some water samples were collected by Niskin bottle on a CTD rosette (\"CTD
profile\"), while others were collected using a trace metal clean \"Towfish\"
that was running along side the ship and collected trace metal clean underway
samples ~1 m below the sea surface.

NO3-+NO2- d15N and d18O and TDN \u03b415N analysis was by the \"denitrifier
method\" and followed the methods described by Sigman et al., 2001, Casciotti
et al., 2002, McIlvin and Casciotti, 2011, and Weigand et al., 2016. Briefly,
NO3-+NO2- was quantitatively reduced to N2O by Pseudomonas aureofaciens and
Pseudomonas chlororaphis, which was then cryogenically focused and analyzed on
an isotope ratio mass spectrometer. A volume of sample was added to each
bacterial vial to achieve a final quantity of 10 or 20 nmols N2O, which was
then purged from the vial using a helium carrier gas. The d15N of N2O in
samples was calibrated with the international isotopic reference materials

The \u03b415N of TDN was measured using persulfate oxidation of DON to NO3-
followed by the denitrified method as described in Knapp et al. (2005).

Nitrate+nitrite concentration was measured by others (Karl lab, U. Hawaii)
using colorimetric methods, and total dissolved nitrogen concentration was
measured by others (Karl lab, U. Hawaii) using uv-oxidation and subsequent
colorimetric analysis. Both of these data sets can be found at:
attribute NC_GLOBAL awards_0_award_nid String 710561
attribute NC_GLOBAL awards_0_award_number String OCE-1537314
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1537314 (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 Water column nitrate+nitrite and total dissolved nitrogen d15N
from HOT LAVA cruise, KOK1806
PI: Angela Knapp (FSU)
Version date: 18 June 2019
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 2019-06-18T17:38:04Z
attribute NC_GLOBAL date_modified String 2019-09-12T14:09:19Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.770818.1
attribute NC_GLOBAL Easternmost_Easting double -154.71
attribute NC_GLOBAL geospatial_lat_max double 19.45
attribute NC_GLOBAL geospatial_lat_min double 19.373
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -154.71
attribute NC_GLOBAL geospatial_lon_min double -154.829
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max double 126.5
attribute NC_GLOBAL geospatial_vertical_min double 1.0
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/770818 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Niskin bottle
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 770835
attribute NC_GLOBAL instruments_0_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_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Niskin bottle
attribute NC_GLOBAL instruments_0_instrument_nid String 413
attribute NC_GLOBAL instruments_0_supplied_name String Niskin bottle (CTD rosette)
attribute NC_GLOBAL instruments_1_acronym String IR Mass Spec
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 770836
attribute NC_GLOBAL instruments_1_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_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB16/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Isotope-ratio Mass Spectrometer
attribute NC_GLOBAL instruments_1_instrument_nid String 469
attribute NC_GLOBAL instruments_1_supplied_name String Thermo Finnigan Delta V
attribute NC_GLOBAL instruments_2_acronym String GeoFish
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 770860
attribute NC_GLOBAL instruments_2_description String The GeoFish towed sampler is a custom designed near surface (
attribute NC_GLOBAL instruments_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/31/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String GeoFish Towed near-Surface Sampler
attribute NC_GLOBAL instruments_2_instrument_nid String 549
attribute NC_GLOBAL instruments_2_supplied_name String Towfish
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, chemistry, concentration, conductivity, ctd, d15, data, dataset, date, depth, dev, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, erddap, karl, Karl_HI_NO3_NO2, Karl_TDN, knapp, Knapp_NO3_NO2_d15N, Knapp_NO3_NO2_d15N_std_dev, Knapp_NO3_NO2_d18O, Knapp_NO3_NO2_d18O_std_dev, Knapp_TDN_d15N, Knapp_TDN_d15N_std_dev, latitude, longitude, management, mole, mole_concentration_of_nitrate_in_sea_water, n02, nitrate, no3, number, ocean, oceanography, oceans, office, preliminary, profile, profiler, salinity, salinity-temperature-depth, science, sea, seawater, sonde, station, Station_Number, std, tdn, temperature, time, towfish, Towfish_or_CTD_profile_station, water
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/770818/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/770818 (external link)
attribute NC_GLOBAL Northernmost_Northing double 19.45
attribute NC_GLOBAL param_mapping String {'770818': {'Date': 'flag - time', 'Lat_N': 'flag - latitude', 'Depth': 'flag - depth', 'Longitude_E': 'flag - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/770818/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Florida State University
attribute NC_GLOBAL people_0_affiliation_acronym String FSU
attribute NC_GLOBAL people_0_person_name String Angela N. Knapp
attribute NC_GLOBAL people_0_person_nid String 555499
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 Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_1_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_1_person_name String Shannon Rauch
attribute NC_GLOBAL people_1_person_nid String 51498
attribute NC_GLOBAL people_1_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_1_role_type String related
attribute NC_GLOBAL project String SW Pac N2 fixation
attribute NC_GLOBAL projects_0_acronym String SW Pac N2 fixation
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:
The availability of nitrogen in the surface ocean plays a critical role regulating rates of primary productivity in the ocean, and thus through modification of the carbon cycle, nitrogen has the capacity to influence climate. The dominant source of biologically available nitrogen to the ocean is through a process known as di-nitrogen (N2) fixation, which involves the reduction of N2 gas dissolved in seawater to ammonium by microbes referred to as diazotrophs. While significant progress has been made identifying a diversity of marine diazotrophs in recent years using molecular tools, quantifying global rates of N2 fixation, and identifying which ocean basin supports the highest fluxes, has remained a vexing question. This research will quantify rates of N2 fixation as well as its importance for supporting production in the southwest Pacific Ocean. Results from this research will shed light on the sensitivities of N2 fixation (temperature, iron concentrations) as well as the extent of spatial and temporal coupling of nitrogen sources and sinks in the ocean. The work will be carried out by an early career scientist, and involve mentoring of young women, middle school girls and minorities, training of undergraduate and graduate researchers, and international collaborations.
Identifying the spatial distribution of the largest di-nitrogen (N2) fixation fluxes to the ocean remains a critical goal of chemical oceanography. The spatial distribution can inform our understanding of the environmental sensitivities of N2 fixation and the capacity for the dominant marine nitrogen (N) source and sink processes to respond to each other and thus influence the global carbon cycle and climate. In addition to temperature, two factors are at the heart of the current debate over what influences the spatial distribution of N2 fixation in the ocean: 1) the presence of adequate iron to meet the needs of N2 fixing microbes, and, 2) the absolute concentrations as well as ratios of surface ocean nitrate and phosphate concentrations that are low relative to the "Redfield" ratio, which are thought to favor N2 fixing microbes. This project will test the effects of gradients in atmospheric dust deposition on N2 fixation rates when surface waters have relatively constant but favorable nitrate to phosphate concentrations. The work will be carried out in the southwest Pacific, a region highlighted by new modeling work for its unique geochemical characteristics that are expected to favor significant N2 fixation fluxes. Nitrate+nitrite d15N as well as total dissolved nitrogen (TDN) concentration and d15N will be measured in water column samples collected on a French cruise and sediment traps were deployed to capture the sinking particulate N flux. The results will be compared with published work to evaluate which ocean regions support the largest N2 fixation fluxes.
More information:
This project was part of the Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) cruise in the Southwest Pacific between New Caledonia (166°28' E; 22°14' S) and Tahiti (149°36' W; 17°34' S) 0-2000 m​
* OUTPACE cruise (doi: https://dx.doi.org/10.17600/15000900)
* OUTPACE website: https://outpace.mio.univ-amu.fr/?lang=en
attribute NC_GLOBAL projects_0_end_date String 2018-07
attribute NC_GLOBAL projects_0_geolocation String Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S
attribute NC_GLOBAL projects_0_name String Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean
attribute NC_GLOBAL projects_0_project_nid String 710562
attribute NC_GLOBAL projects_0_project_website String http://scope.soest.hawaii.edu/data/lava/lava.html (external link)
attribute NC_GLOBAL projects_0_start_date String 2015-08
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 Southernmost_Northing double 19.373
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String time
attribute NC_GLOBAL summary String This data set includes water column nitrate+nitrite and total dissolved nitrogen d15N measurements. These measurements were used to address the source of nitrate+nitrite in surface waters observed after the 2018 Kilauea eruption entered the ocean, leading to enhanced surface ocean chlorophyll. The results are consistent with an upwelling source of nitrate+nitrite from ~400 m driven by hot lava entering the ocean, leading to increased buoyancy of waters, driving \roils\ (see F. J. Sansone, and J. A. Resing, 1995, J. Geophys. Res. Oceans). These data are also used as evidence that biological nitrogen fixation did not contribute to the nitrate+nitrite observed in surface waters.
attribute NC_GLOBAL time_coverage_end String 2018-07-14
attribute NC_GLOBAL time_coverage_start String 2018-07-14
attribute NC_GLOBAL title String Water column nitrate+nitrite d15N and d18O and total dissolved nitrogen d15N measurements from R/V Ka`imikai-O-Kanaloa cruise KOK1806 (HOT LAVA) in July 2018
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -154.829
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Station_Number   byte  
attribute Station_Number _FillValue byte 127
attribute Station_Number actual_range byte 1, 15
attribute Station_Number bcodmo_name String station
attribute Station_Number colorBarMaximum double 100.0
attribute Station_Number colorBarMinimum double 0.0
attribute Station_Number description String Station number
attribute Station_Number long_name String Station Number
attribute Station_Number units String unitless
variable Towfish_or_CTD_profile_station   String  
attribute Towfish_or_CTD_profile_station bcodmo_name String instrument
attribute Towfish_or_CTD_profile_station description String Sampling system (either towfish or CTD rosette)
attribute Towfish_or_CTD_profile_station long_name String Towfish Or CTD Profile Station
attribute Towfish_or_CTD_profile_station 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 1.0, 126.5
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 time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.5315264E9, 1.5315264E9
attribute time axis String T
attribute time bcodmo_name String date
attribute time description String Date of collection. Format: yyyy-mm-dd
attribute time ioos_category String Time
attribute time long_name String Date
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute time source_name String Date
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time time_precision String 1970-01-01
attribute time units String seconds since 1970-01-01T00:00:00Z
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 19.373, 19.45
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
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 source_name String Lat_N
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 -154.829, -154.71
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
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 source_name String Longitude_E
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable Karl_HI_NO3_NO2   float  
attribute Karl_HI_NO3_NO2 _FillValue float NaN
attribute Karl_HI_NO3_NO2 actual_range float 0.0, 4.69
attribute Karl_HI_NO3_NO2 bcodmo_name String NO3_NO2
attribute Karl_HI_NO3_NO2 colorBarMaximum double 50.0
attribute Karl_HI_NO3_NO2 colorBarMinimum double 0.0
attribute Karl_HI_NO3_NO2 description String Nitrate+nitrite concentration; measured in Karl lab at U. Hawaii using colorimetric methods
attribute Karl_HI_NO3_NO2 long_name String Mole Concentration Of Nitrate In Sea Water
attribute Karl_HI_NO3_NO2 units String micromolar (uM)
variable Knapp_NO3_NO2_d15N   float  
attribute Knapp_NO3_NO2_d15N _FillValue float NaN
attribute Knapp_NO3_NO2_d15N actual_range float 3.41, 11.47
attribute Knapp_NO3_NO2_d15N bcodmo_name String 15N of nitrate plus nitrite
attribute Knapp_NO3_NO2_d15N colorBarMaximum double 50.0
attribute Knapp_NO3_NO2_d15N colorBarMinimum double 0.0
attribute Knapp_NO3_NO2_d15N description String Nitrate+nitrite d15N
attribute Knapp_NO3_NO2_d15N long_name String Mole Concentration Of Nitrate In Sea Water
attribute Knapp_NO3_NO2_d15N units String per mil
variable Knapp_NO3_NO2_d15N_std_dev   float  
attribute Knapp_NO3_NO2_d15N_std_dev _FillValue float NaN
attribute Knapp_NO3_NO2_d15N_std_dev actual_range float 0.02, 1.21
attribute Knapp_NO3_NO2_d15N_std_dev bcodmo_name String 15N of nitrate plus nitrite
attribute Knapp_NO3_NO2_d15N_std_dev colorBarMaximum double 50.0
attribute Knapp_NO3_NO2_d15N_std_dev colorBarMinimum double 0.0
attribute Knapp_NO3_NO2_d15N_std_dev description String Standard deviation of Knapp_NO3_NO2_d15N
attribute Knapp_NO3_NO2_d15N_std_dev long_name String Mole Concentration Of Nitrate In Sea Water
attribute Knapp_NO3_NO2_d15N_std_dev units String per mil
variable Knapp_NO3_NO2_d18O   float  
attribute Knapp_NO3_NO2_d18O _FillValue float NaN
attribute Knapp_NO3_NO2_d18O actual_range float -0.57, 9.97
attribute Knapp_NO3_NO2_d18O bcodmo_name String unknown
attribute Knapp_NO3_NO2_d18O colorBarMaximum double 50.0
attribute Knapp_NO3_NO2_d18O colorBarMinimum double 0.0
attribute Knapp_NO3_NO2_d18O description String Nitrate+nitrite d18O
attribute Knapp_NO3_NO2_d18O long_name String Mole Concentration Of Nitrate In Sea Water
attribute Knapp_NO3_NO2_d18O units String per mil
variable Knapp_NO3_NO2_d18O_std_dev   float  
attribute Knapp_NO3_NO2_d18O_std_dev _FillValue float NaN
attribute Knapp_NO3_NO2_d18O_std_dev actual_range float 0.05, 2.55
attribute Knapp_NO3_NO2_d18O_std_dev bcodmo_name String unknown
attribute Knapp_NO3_NO2_d18O_std_dev colorBarMaximum double 50.0
attribute Knapp_NO3_NO2_d18O_std_dev colorBarMinimum double 0.0
attribute Knapp_NO3_NO2_d18O_std_dev description String Standard deviation of Knapp_NO3_NO2_d18O
attribute Knapp_NO3_NO2_d18O_std_dev long_name String Mole Concentration Of Nitrate In Sea Water
attribute Knapp_NO3_NO2_d18O_std_dev units String per mil
variable Karl_TDN   float  
attribute Karl_TDN _FillValue float NaN
attribute Karl_TDN actual_range float 4.84, 9.83
attribute Karl_TDN bcodmo_name String Total Dissolved Nitrogren
attribute Karl_TDN description String Total dissolved nitrogen concentration; measured in Karl lab at U. Hawaii using uv-oxidation and subsequent colorimetric analysis
attribute Karl_TDN long_name String Karl TDN
attribute Karl_TDN units String micromolar (uM)
variable Knapp_TDN_d15N   float  
attribute Knapp_TDN_d15N _FillValue float NaN
attribute Knapp_TDN_d15N actual_range float 2.8, 6.15
attribute Knapp_TDN_d15N bcodmo_name String 15N of Total Particulate Nitrogen
attribute Knapp_TDN_d15N description String Total dissolved nitrogen ?15N
attribute Knapp_TDN_d15N long_name String Knapp TDN D15 N
attribute Knapp_TDN_d15N units String per mil
variable Knapp_TDN_d15N_std_dev   float  
attribute Knapp_TDN_d15N_std_dev _FillValue float NaN
attribute Knapp_TDN_d15N_std_dev actual_range float 0.0, 0.97
attribute Knapp_TDN_d15N_std_dev bcodmo_name String 15N of Total Particulate Nitrogen
attribute Knapp_TDN_d15N_std_dev description String Standard deviation of Knapp_TDN_d15N
attribute Knapp_TDN_d15N_std_dev long_name String Knapp TDN D15 N Std Dev
attribute Knapp_TDN_d15N_std_dev 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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