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Grid DAP Data | Sub- set | Table DAP Data | Make A Graph | W M S | Source Data Files | Acces- sible | Title | Sum- mary | FGDC, ISO, Metadata | Back- ground Info | RSS | E | Institution | Dataset ID |
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data | graph | files | public | [Gulf of Mexico NO3 isotopes] - Water column nitrate+nitrite d15N and d18O from samples collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018 (Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean) | F I M | background | BCO-DMO | bcodmo_dataset_782518 |
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 | Water column samples were collected by Niskin bottle on a CTD rosette (\u201cCTD profile\u201d). NO3-+NO2- concentration was measured using a chemiluminescent method described by Braman and Hendrix, 1989, with a detection limit of 0.1 \u00b5M. NO3-+NO2- d15N and d18O analyses were 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. The average precision of the nitrate+nitrite concentration measurement was <0.2 \u00b5M. The average precision of nitrate+nitrite d15N measurements was <0.2 per mil and for d18O was <0.3 per mil, but with the standard deviation for duplicate analyses of each sample reported here. NO3-+NO2- \u03b415N \u03b418O analyses were calibrated with IAEA N3 and USGS 34 NO3- d15N isotopic reference materials as described in McIlvin and Casciotti, 2011. NO3-+NO2- d18O were also calibrated with the USGS 35 isotopic reference material as described in McIlvin and Casciotti, 2011. |
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 |
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 | Gulf of Mexico NO3 isotopes PI(s): Angela N. Knapp Data Version 1: 2019-11-21 |
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/ |
attribute | NC_GLOBAL | data_source | String | extract_data_as_tsv version 2.3 19 Dec 2019 |
attribute | NC_GLOBAL | date_created | String | 2019-11-21T20:42:09Z |
attribute | NC_GLOBAL | date_modified | String | 2019-11-26T21:22:23Z |
attribute | NC_GLOBAL | defaultDataQuery | String | &time<now |
attribute | NC_GLOBAL | doi | String | 10.1575/1912/bco-dmo.782518.1 |
attribute | NC_GLOBAL | Easternmost_Easting | double | -79.5 |
attribute | NC_GLOBAL | geospatial_lat_max | double | 27.0 |
attribute | NC_GLOBAL | geospatial_lat_min | double | 25.866 |
attribute | NC_GLOBAL | geospatial_lat_units | String | degrees_north |
attribute | NC_GLOBAL | geospatial_lon_max | double | -79.5 |
attribute | NC_GLOBAL | geospatial_lon_min | double | -92.0401 |
attribute | NC_GLOBAL | geospatial_lon_units | String | degrees_east |
attribute | NC_GLOBAL | geospatial_vertical_max | double | 2805.0 |
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/782518 |
attribute | NC_GLOBAL | institution | String | BCO-DMO |
attribute | NC_GLOBAL | instruments_0_acronym | String | Mass Spec |
attribute | NC_GLOBAL | instruments_0_dataset_instrument_description | String | Nitrate+nitrite d15N was measured using a Thermo Finnigan Delta V isotope ratio mass spectrometer. |
attribute | NC_GLOBAL | instruments_0_dataset_instrument_nid | String | 782731 |
attribute | NC_GLOBAL | instruments_0_description | String | General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components. |
attribute | NC_GLOBAL | instruments_0_instrument_external_identifier | String | https://vocab.nerc.ac.uk/collection/L05/current/LAB16/ |
attribute | NC_GLOBAL | instruments_0_instrument_name | String | Mass Spectrometer |
attribute | NC_GLOBAL | instruments_0_instrument_nid | String | 685 |
attribute | NC_GLOBAL | instruments_0_supplied_name | String | Thermo Finnigan Delta V isotope ratio mass spectrometer |
attribute | NC_GLOBAL | instruments_1_acronym | String | Gas Analyzer |
attribute | NC_GLOBAL | instruments_1_dataset_instrument_description | String | Nitrate+nitrite concentration was measured on a Thermo 42i NOx analyzer. |
attribute | NC_GLOBAL | instruments_1_dataset_instrument_nid | String | 782730 |
attribute | NC_GLOBAL | instruments_1_description | String | Gas Analyzers - Instruments for determining the qualitative and quantitative composition of gas mixtures. |
attribute | NC_GLOBAL | instruments_1_instrument_name | String | Gas Analyzer |
attribute | NC_GLOBAL | instruments_1_instrument_nid | String | 720 |
attribute | NC_GLOBAL | instruments_1_supplied_name | String | Thermo 42i NOx analyzer |
attribute | NC_GLOBAL | keywords | String | altimetry, bco, bco-dmo, biological, chemical, chemistry, concentration, cruise, Cruise_ID, data, dataset, date, density, depth, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, Earth Science > Oceans > Salinity/Density > Density, erddap, laboratory, latitude, longitude, management, mole, mole_concentration_of_nitrate_in_sea_water, n02, nitrate, no3, NO3_NO2, NO3_NO2_d15N, NO3_NO2_d18O, ocean, oceanography, oceans, office, preliminary, sal, salinity, sampling, satellite, science, sea, sea_water_sigma_theta, seawater, sigma, SigmaTheta, temperature, theta, time, water |
attribute | NC_GLOBAL | keywords_vocabulary | String | GCMD Science Keywords |
attribute | NC_GLOBAL | license | String | https://www.bco-dmo.org/dataset/782518/license |
attribute | NC_GLOBAL | metadata_source | String | https://www.bco-dmo.org/api/dataset/782518 |
attribute | NC_GLOBAL | Northernmost_Northing | double | 27.0 |
attribute | NC_GLOBAL | param_mapping | String | {'782518': {'Latitude': 'flag - latitude', 'Depth': 'flag - depth', 'Longitude': 'flag - longitude'}} |
attribute | NC_GLOBAL | parameter_source | String | https://www.bco-dmo.org/mapserver/dataset/782518/parameters |
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 | Amber York |
attribute | NC_GLOBAL | people_1_person_nid | String | 643627 |
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 |
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 | 25.866 |
attribute | NC_GLOBAL | standard_name_vocabulary | String | CF Standard Name Table v55 |
attribute | NC_GLOBAL | summary | String | This data set includes water column nitrate+nitrite d15N and d18O measurements from the Gulf of Mexico and Florida Straits. These measurements were used to address whether Mississippi River nitrate is entrained in Loop Current waters and potentially exported from the Gulf of Mexico to the North Atlantic. Water samples were collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018. |
attribute | NC_GLOBAL | title | String | [Gulf of Mexico NO3 isotopes] - Water column nitrate+nitrite d15N and d18O from samples collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018 (Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean) |
attribute | NC_GLOBAL | version | String | 1 |
attribute | NC_GLOBAL | Westernmost_Easting | double | -92.0401 |
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 | Rolling Deck Repository or other cruise identifier |
attribute | Cruise_ID | long_name | String | Cruise ID |
attribute | Cruise_ID | units | String | unitless |
variable | Sampling_Date | String | ||
attribute | Sampling_Date | bcodmo_name | String | date |
attribute | Sampling_Date | description | String | Date on which the sample was collected |
attribute | Sampling_Date | long_name | String | Sampling Date |
attribute | Sampling_Date | nerc_identifier | String | https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ |
attribute | Sampling_Date | source_name | String | Sampling_Date |
attribute | Sampling_Date | time_precision | String | 1970-01-01 |
attribute | Sampling_Date | units | String | unitless |
variable | latitude | double | ||
attribute | latitude | _CoordinateAxisType | String | Lat |
attribute | latitude | _FillValue | double | NaN |
attribute | latitude | actual_range | double | 25.866, 27.0 |
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 at which the sample was collected |
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/ |
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 | -92.0401, -79.5 |
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 at which the sample was collected |
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/ |
attribute | longitude | standard_name | String | longitude |
attribute | longitude | units | String | degrees_east |
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, 2805.0 |
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 | Depth at which the sample was collected |
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/ |
attribute | depth | positive | String | down |
attribute | depth | standard_name | String | depth |
attribute | depth | units | String | m |
variable | SigmaTheta | float | ||
attribute | SigmaTheta | _FillValue | float | NaN |
attribute | SigmaTheta | actual_range | float | 22.53, 27.77 |
attribute | SigmaTheta | bcodmo_name | String | sigma_theta |
attribute | SigmaTheta | description | String | Potential Density of depth at which sample was collected |
attribute | SigmaTheta | long_name | String | Sea Water Sigma Theta |
attribute | SigmaTheta | units | String | unitless |
variable | NO3_NO2 | float | ||
attribute | NO3_NO2 | _FillValue | float | NaN |
attribute | NO3_NO2 | actual_range | float | 0.0, 31.22 |
attribute | NO3_NO2 | bcodmo_name | String | NO3_NO2 |
attribute | NO3_NO2 | colorBarMaximum | double | 50.0 |
attribute | NO3_NO2 | colorBarMinimum | double | 0.0 |
attribute | NO3_NO2 | description | String | Concentration of nitrate+nitrite in a sample |
attribute | NO3_NO2 | long_name | String | Mole Concentration Of Nitrate In Sea Water |
attribute | NO3_NO2 | units | String | micro molar (µM) |
variable | NO3_NO2_d15N | float | ||
attribute | NO3_NO2_d15N | _FillValue | float | NaN |
attribute | NO3_NO2_d15N | actual_range | float | 2.39, 5.8 |
attribute | NO3_NO2_d15N | bcodmo_name | String | d15N |
attribute | NO3_NO2_d15N | colorBarMaximum | double | 50.0 |
attribute | NO3_NO2_d15N | colorBarMinimum | double | 0.0 |
attribute | NO3_NO2_d15N | description | String | Nitrogen isotopic composition of nitrate+nitrite in a sample |
attribute | NO3_NO2_d15N | long_name | String | Mole Concentration Of Nitrate In Sea Water |
attribute | NO3_NO2_d15N | units | String | per mil (0/00) vs. N2 in air |
variable | NO3_NO2_d18O | float | ||
attribute | NO3_NO2_d18O | _FillValue | float | NaN |
attribute | NO3_NO2_d18O | actual_range | float | 0.67, 3.75 |
attribute | NO3_NO2_d18O | bcodmo_name | String | d18O_NO3 |
attribute | NO3_NO2_d18O | colorBarMaximum | double | 50.0 |
attribute | NO3_NO2_d18O | colorBarMinimum | double | 0.0 |
attribute | NO3_NO2_d18O | description | String | Oxygen isotopic composition of nitrate+nitrite in a sample |
attribute | NO3_NO2_d18O | long_name | String | Mole Concentration Of Nitrate In Sea Water |
attribute | NO3_NO2_d18O | units | String | per mil (0/00) vs. VSMOW |
variable | sal | float | ||
attribute | sal | _FillValue | float | NaN |
attribute | sal | actual_range | float | 34.9, 36.81 |
attribute | sal | bcodmo_name | String | sal |
attribute | sal | description | String | salinity of the sample |
attribute | sal | long_name | String | Sal |
attribute | sal | nerc_identifier | String | https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/ |
attribute | sal | units | String | Practical Salinity Units (PSU) |
variable | temp | float | ||
attribute | temp | _FillValue | float | NaN |
attribute | temp | actual_range | float | 4.24, 29.45 |
attribute | temp | bcodmo_name | String | temperature |
attribute | temp | description | String | temperature of the sample |
attribute | temp | long_name | String | Temperature |
attribute | temp | nerc_identifier | String | https://vocab.nerc.ac.uk/collection/P01/current/TEMPP901/ |
attribute | temp | units | String | degrees Celsius |
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.