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Dataset Title:  Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the
southwest Pacific Ocean between New Caledonia and Tahiti from February to March
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_733237)
Range: longitude = -172.7813 to 168.0118°E, latitude = -19.9832 to -18.179°N, depth = 3.0 to 2002.0m
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Data Access Form | Files
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Things You Can Do With Your Graphs

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Date {
    Int32 _FillValue 2147483647;
    Int32 actual_range 20150223, 20150330;
    String bcodmo_name "date";
    String description "Date of observation in four digit year; 2 digit month; 2 digit day (yyyymmdd) format";
    String long_name "Date";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String units "unitless";
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -172.7813, 168.0118;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "Longitude with west negative.";
    String ioos_category "Location";
    String long_name "Longitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
    String standard_name "longitude";
    String units "degrees_east";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range -19.9832, -18.179;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "Latitude with south negative.";
    String ioos_category "Location";
    String long_name "Latitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
    String standard_name "latitude";
    String units "degrees_north";
  Station {
    String bcodmo_name "station";
    String description "name of the station";
    String long_name "Station";
    String units "unitless";
  Cast {
    Int16 _FillValue 32767;
    Int16 actual_range 10, 210;
    String bcodmo_name "cast";
    String description "cast number";
    String long_name "Cast";
    String units "unitless";
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue NaN;
    Float64 actual_range 3.0, 2002.0;
    String axis "Z";
    String bcodmo_name "depth";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "depth of observation";
    String ioos_category "Location";
    String long_name "Depth";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
    String positive "down";
    String standard_name "depth";
    String units "m";
  Sigma_theta {
    Float32 _FillValue NaN;
    Float32 actual_range 21.71, 27.67;
    String bcodmo_name "sigma_theta";
    String description "potential density";
    String long_name "Sea Water Sigma Theta";
    String units "kilograms per meter cubed (kg/m3)";
  NO3_NO2 {
    String bcodmo_name "NO3_NO2";
    String description "nitrate+nitrite concentration ([NO3-+NO2-])";
    String long_name "NO3 NO2";
    String units "micromole (uM)";
  NO3_NO2_d15N {
    String bcodmo_name "15N of nitrate plus nitrite";
    String description "nitrate+nitrite d15N (NO3-+NO2- d15N)";
    String long_name "NO3 NO2 D15 N";
    String units "per mil";
  NO3_NO2_d15N_1_SD {
    String bcodmo_name "15N of nitrate plus nitrite";
    String description "nitrate+nitrite d15N standard deviation";
    String long_name "NO3 NO2 D15 N 1 SD";
    String units "per mil";
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
    String acquisition_description 
"NO3-+NO2- d15N analysis was by the \\u201cdenitrifier method\\u201d 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 described in the
Processing Description.";
    String awards_0_award_nid "710561";
    String awards_0_award_number "OCE-1537314";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1537314";
    String awards_0_funder_name "NSF Division of Ocean Sciences";
    String awards_0_funding_acronym "NSF OCE";
    String awards_0_funding_source_nid "355";
    String awards_0_program_manager "Henrietta N Edmonds";
    String awards_0_program_manager_nid "51517";
    String cdm_data_type "Other";
    String comment 
"Station location and NO3+NO2 d15N values measured for the OUTPACE long duration (LD) stations. 
 PI: Angela Knapp 
 Version: 2018-04-11";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2018-04-11T19:49:07Z";
    String date_modified "2018-09-20T17:38:55Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/bco-dmo.733303";
    Float64 Easternmost_Easting 168.0118;
    Float64 geospatial_lat_max -18.179;
    Float64 geospatial_lat_min -19.9832;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 168.0118;
    Float64 geospatial_lon_min -172.7813;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 2002.0;
    Float64 geospatial_vertical_min 3.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2022-08-13T01:16:56Z (local files)
2022-08-13T01:16:56Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_733237.das";
    String infoUrl "https://www.bco-dmo.org/dataset/733237";
    String institution "BCO-DMO";
    String instruments_0_acronym "IR Mass Spec";
    String instruments_0_dataset_instrument_description "Nitrate+nitrite d15N was measured using a Thermo Finnigan Delta V isotope ratio mass spectrometer.";
    String instruments_0_dataset_instrument_nid "733270";
    String instruments_0_description "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).";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
    String instruments_0_instrument_name "Isotope-ratio Mass Spectrometer";
    String instruments_0_instrument_nid "469";
    String instruments_0_supplied_name "Thermo Finnigan Delta V isotope ratio mass spectrometer.";
    String keywords "bco, bco-dmo, biological, cast, chemical, d15, data, dataset, date, density, depth, dmo, earth, Earth Science > Oceans > Salinity/Density > Density, erddap, latitude, longitude, management, nitrate, nitrite, no2, no3, NO3_NO2, NO3_NO2_d15N, NO3_NO2_d15N_1_SD, ocean, oceanography, oceans, office, preliminary, salinity, science, sea, sea_water_sigma_theta, seawater, sigma, Sigma_theta, station, theta, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "https://www.bco-dmo.org/dataset/733237/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/733237";
    Float64 Northernmost_Northing -18.179;
    String param_mapping "{'733237': {'Latitude': 'flag - latitude', 'Depth': 'flag - depth', 'Longitude': 'flag - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/733237/parameters";
    String people_0_affiliation "Florida State University";
    String people_0_affiliation_acronym "FSU";
    String people_0_person_name "Angela N. Knapp";
    String people_0_person_nid "555499";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Mediterranean Institute of Oceanography";
    String people_1_affiliation_acronym "MIO";
    String people_1_person_name "Sophie Bonnet";
    String people_1_person_nid "663895";
    String people_1_role "International Collaborator";
    String people_1_role_type "originator";
    String people_2_affiliation "Mediterranean Institute of Oceanography";
    String people_2_affiliation_acronym "MIO";
    String people_2_person_name "Thierry Moutin";
    String people_2_person_nid "663893";
    String people_2_role "International Collaborator";
    String people_2_role_type "originator";
    String people_3_affiliation "Mediterranean Institute of Oceanography";
    String people_3_affiliation_acronym "MIO";
    String people_3_person_name "Oliver Grosso";
    String people_3_person_nid "733295";
    String people_3_role "Scientist";
    String people_3_role_type "originator";
    String people_4_affiliation "Villefranche Oceanographic Laboratory";
    String people_4_affiliation_acronym "LOV";
    String people_4_person_name "Nathalie Leblond";
    String people_4_person_nid "733296";
    String people_4_role "Scientist";
    String people_4_role_type "originator";
    String people_5_affiliation "Florida State University";
    String people_5_affiliation_acronym "FSU";
    String people_5_person_name "Kelly M. McCabe";
    String people_5_person_nid "733294";
    String people_5_role "Student";
    String people_5_role_type "related";
    String people_6_affiliation "Florida State University";
    String people_6_affiliation_acronym "FSU";
    String people_6_person_name "Angela N. Knapp";
    String people_6_person_nid "555499";
    String people_6_role "Contact";
    String people_6_role_type "related";
    String people_7_affiliation "Woods Hole Oceanographic Institution";
    String people_7_affiliation_acronym "WHOI BCO-DMO";
    String people_7_person_name "Mathew Biddle";
    String people_7_person_nid "708682";
    String people_7_role "BCO-DMO Data Manager";
    String people_7_role_type "related";
    String project "SW Pac N2 fixation";
    String projects_0_acronym "SW Pac N2 fixation";
    String projects_0_description 
"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";
    String projects_0_end_date "2018-07";
    String projects_0_geolocation "Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S";
    String projects_0_name "Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean";
    String projects_0_project_nid "710562";
    String projects_0_project_website "http://scope.soest.hawaii.edu/data/lava/lava.html";
    String projects_0_start_date "2015-08";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -19.9832;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Constraining the rates and spatial distribution of di-nitrogen (N2) fixation fluxes to the ocean informs our understanding of the environmental sensitivities of N2 fixation as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to each other. Here we quantify rates of N2 fixation as well as its contribution to export production along a zonal transect in the Western Tropical South Pacific (WTSP) Ocean using N isotope (\\u201cd15N\\u201d) budgets. Comparing measurements of water column nitrate+nitrite d15N with the d15N of sinking particulate N at a western, central, and eastern station, these d15N budgets indicate high, modest, and low rates of N2 fixation at the respective stations. The results also imply that N2 fixation supports exceptionally high, i.e., >50%, of export production at the western and central stations, which are also proximal to the largest iron sources. These geochemically-based rates of N2 fixation are equal to or greater than those previously reported in the tropical North Atlantic, indicating that the WTSP Ocean has the capacity to support globally significant rates of N2 fixation, which may compensate for N removal in the oxygen deficient zones of the eastern tropical Pacific.";
    String title "Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 2015";
    String version "1";
    Float64 Westernmost_Easting -172.7813;
    String xml_source "osprey2erddap.update_xml() v1.3";


Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form
For example,
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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