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Title Sum-
Institution Dataset ID
     data   graph     files  public Bulk suspended PON d15N from several cruises conducted in the Southern Ocean south of Africa
from 2012-2019
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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 Bulk (>0.3 um) suspended PON samples were collected from the underway intake
(at 7 m depth) and frozen at \u221280\u00b0C until isotope analysis. The N
isotope composition of bulk PON was measured by elemental analyser-isotope
ratio mass spectrometry at the University of Cape Town. See methods section of
Smart et al. (2020) for more detail.
attribute NC_GLOBAL awards_0_award_nid String 557249
attribute NC_GLOBAL awards_0_award_number String PLR-1401489
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=1401489 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Polar Programs
attribute NC_GLOBAL awards_0_funding_acronym String NSF PLR
attribute NC_GLOBAL awards_0_funding_source_nid String 490497
attribute NC_GLOBAL awards_0_program_manager String Dr Mark Kurz
attribute NC_GLOBAL awards_0_program_manager_nid String 557248
attribute NC_GLOBAL awards_1_award_nid String 558188
attribute NC_GLOBAL awards_1_award_number String OCE-1060947
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=1060947 (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 Henrietta N Edmonds
attribute NC_GLOBAL awards_1_program_manager_nid String 51517
attribute NC_GLOBAL awards_2_award_nid String 788981
attribute NC_GLOBAL awards_2_award_number String OCE-0922345
attribute NC_GLOBAL awards_2_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0922345 (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 Kandace S Binkley
attribute NC_GLOBAL awards_2_program_manager_nid String 51512
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Bulk suspended PON d15N from the Southern Ocean
PI: Daniel M. Sigman (Princeton)
Contact: Sandi Smart (Stellenbosch University & The Max Planck Institute for Chemistry)
Version date: 04 March 2020
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 2020-03-04T19:46:44Z
attribute NC_GLOBAL date_modified String 2020-03-12T18:41:16Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.805324.1
attribute NC_GLOBAL Easternmost_Easting double 41.9621
attribute NC_GLOBAL geospatial_lat_max double -34.4835
attribute NC_GLOBAL geospatial_lat_min double -56.0768
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 41.9621
attribute NC_GLOBAL geospatial_lon_min double 3.0E-4
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/805324 (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_nid String 805400
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 Thermo Scientific Delta V Plus mass spectrometer
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 805399
attribute NC_GLOBAL instruments_1_description String Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB01/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Elemental Analyzer
attribute NC_GLOBAL instruments_1_instrument_nid String 546339
attribute NC_GLOBAL instruments_1_supplied_name String Thermo Scientific FLASH 2000 elemental analyzer
attribute NC_GLOBAL keywords String average, bco, bco-dmo, biological, chemical, cruise, data, dataset, date, dmo, erddap, iso, ISO_DateTime_UTC, latitude, leg, longitude, management, oceanography, office, ponconc, PONconc_avg, PONconc_n, PONconc_sd, pond15, PONd15N_avg, PONd15N_n, PONd15N_sd, preliminary, ship, time, time2
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/805324/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/805324 (external link)
attribute NC_GLOBAL Northernmost_Northing double -34.4835
attribute NC_GLOBAL param_mapping String {'805324': {'latitude': 'flag - latitude', 'longitude': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/805324/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Princeton University
attribute NC_GLOBAL people_0_person_name String Daniel M. Sigman
attribute NC_GLOBAL people_0_person_nid String 51417
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 Stellenbosch University
attribute NC_GLOBAL people_1_person_name String Sandi M. Smart
attribute NC_GLOBAL people_1_person_nid String 557790
attribute NC_GLOBAL people_1_role String Contact
attribute NC_GLOBAL people_1_role_type String related
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 Diatom-bound_N_Isotopes,N Isotopes Foraminifera,stable isotope instrumentation
attribute NC_GLOBAL projects_0_acronym String Diatom-bound_N_Isotopes
attribute NC_GLOBAL projects_0_description String Description from NSF award abstract:
The high concentration of the major nutrients nitrate and phosphate is a fundamental characteristic of the Antarctic Zone in the Southern Ocean and is central to its role in global ocean fertility and the global carbon cycle. The isotopic composition of diatom-bound organic nitrogen is one of the best hopes for reconstructing the nutrient status of polar surface waters over glacial cycles, which in turn may hold the explanation for the decline in atmospheric carbon dioxide during ice ages. The PIs propose to generate detailed diatom-bound nitrogen isotope (δ15Ndb) records from high sedimentation rate cores from the Kerguelen Plateau. Because the cores were collected at relatively shallow seafloor depths, they have adequate planktonic and benthic foraminifera to develop accurate age models. The resulting data could be compared with climate records from Antarctic ice cores and other archives to investigate climate-related changes, including the major steps into and out of ice ages and the millennial-scale events that occur during ice ages and at their ends. The records generated in this project will provide a critical test of hypotheses for the cause of lower ice age CO2.
This study will contribute to the goal of understanding ice ages and past CO2 changes, which both have broad implications for future climate. Undergraduates will undertake summer internships, with the possibility of extending their work into junior year projects and senior theses. In addition, the PI will lead modules for two Princeton programs for middle school teachers and will host a teacher for a six-week summer research project.
attribute NC_GLOBAL projects_0_end_date String 2017-04
attribute NC_GLOBAL projects_0_geolocation String Kerguelen Plateau
attribute NC_GLOBAL projects_0_name String High-resolution, Assemblage-specific Records of Diatom-bound N Isotopes from the Indian Sector of the Antarctic Ocean
attribute NC_GLOBAL projects_0_project_nid String 557250
attribute NC_GLOBAL projects_0_start_date String 2014-05
attribute NC_GLOBAL projects_1_acronym String N Isotopes Foraminifera
attribute NC_GLOBAL projects_1_description String NSF Award Abstract:
Nitrogen (N) and phosphorus are the two nutrients required in large quantity by phytoplankton in the ocean, and together they limit productivity throughout most of the tropical, subtropical, and temperate ocean. Both the cycling of N and its input/output budget have been argued to control the fertility of the ocean and the ocean's role in setting atmospheric CO2. The CaCO3 tests of foraminifera can represent a substantial fraction of marine sediments and have been used extensively in paleoceanography; they are an obvious target for isotopic analysis of microfossil-bound organic matter.
In recent years, researchers at Princeton have developed a protocol for the isotopic analysis of foraminiferal shell-bound N. The current protocol is at least 100 times more sensitive than typical on-line combustion, allowing for rapid progress with a N isotope archive that was previously not feasible to measure. Measurements on surface sediments and a downcore record from the Caribbean show the promise of foraminifera-bound del15N (fb-del15N) to provide both a robust N isotope archive for paleoceanography, and one with a unique potential of richness, given the existence of multiple foraminiferal species with different depth habitats and behaviors. Moreover, the finding from the Caribbean Sea record -- reduced N fixation in ice age Atlantic -- has changed the scientific conversation about the nature of the input/output budget of oceanic fixed N and its potential to change ocean fertility and atmospheric CO2. However, the controls on fb-del15N have not yet been adequately studied.
In this project, as a first major step in developing a foundation for the paleoceanographic application of fb-del15N, the same Princeton University team will study its genesis in the water column, transport to the seafloor, and early diagenesis. They will undertake this study in the Sargasso Sea south of Bermuda. This is one of the best studied regions of the ocean, in general and with respect to foraminifera, and a region that has been has been a focus of the N isotope research of the PI for the last decade and others previously. Moreover, its significant seasonality -- in physical oceanography, biogeochemistry, and foraminiferal species abundance -- will facilitate the effort to understand the controls on fb-del15N at a mechanistic level. The research team will participate in six Bermuda Atlantic Time-series Study (BATS) cruises over two years, collecting foraminifera and other N forms likely to provide insight into the controls on fb-del15N. From the nearby Oceanic Flux Program (OFP) moored sediment traps and from shallow sediments collected in the region, they will pick foraminifera shells and again make relevant ancillary measurements. This work will establish the relationship of foraminiferal biomass to shell-bound del15N for different species, and comparison of the foraminiferal isotope data with the upper ocean N pools will yield empirical isotopic relationships and work toward a mechanistic insight of fb-del15N (e.g., the importance of different N pools to the diets of different foraminifera; the role of algal symbionts). The sediment trap and surface sediment data will support the plankton tow data by integrating over longer time scales and will also address questions regarding late stage (e.g., gametogenic) calcification and the early diagenesis of fb-del15N and fb-N content.
Broader Impacts: This study will yield an improved understanding of the nutrient dynamics of foraminifera, a class of organisms whose shells are a central tool in micropaleontology and paleoclimatology. The project will also build on the principal investigator's involvement in the Bermuda Institute of Ocean Sciences as an asset for integrating ocean-related education and research at both the undergraduate and graduate levels.
attribute NC_GLOBAL projects_1_end_date String 2016-03
attribute NC_GLOBAL projects_1_geolocation String Sargasso Sea
attribute NC_GLOBAL projects_1_name String Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study
attribute NC_GLOBAL projects_1_project_nid String 743583
attribute NC_GLOBAL projects_1_start_date String 2011-04
attribute NC_GLOBAL projects_2_acronym String stable isotope instrumentation
attribute NC_GLOBAL projects_2_description String NSF Award Abstract:
Intellectual Merit:
The PIs are requesting funds to acquire a suite of instruments for stable isotope (N) research, including a denitrifier-based, natural abundance isotope system, a tracer isotope system, and general purpose natural abundance peripherals for an existing mass spectrometer. Specific instruments requested include a Thermo Electron MAT 253 stable isotope mass spectrometer, a Thermo DeltaVAdvantage stable isotope mass spectrometer with peripherals, an EA peripheral for combustion-based isotope analysis, and a GasBench II carbon dioxide preparation and purification system. The proposed instrumentation would enable research efforts examining natural stable isotope abundances that include ocean biogeochemistry and paleoceanography, terrestrial biogeochemistry, carbon isotopes in Precambrian Earth history. Stable isotope tracer research would include nitrification, nitrogen fixation, and carbon partitioning during biostimulation.
Broader Impacts:
The PIs state that the proposed instrumentation would expand the research capabilities of the institution and specifically the Departments of Geosciences and Ecology and Evolutionary Biology. The improvements to the denitrifier method will also serve to expand the capabilities of the ocean research community at large. Additionally, the proposed instrumentation will enable method development and provide training for undergraduate students at the institution and those participating in a collaborative effort with the University of Cape Town.
attribute NC_GLOBAL projects_2_end_date String 2012-08
attribute NC_GLOBAL projects_2_name String MRI: Acquisition of Stable Isotope Instrumentation for the Biogeosciences at Princeton University
attribute NC_GLOBAL projects_2_project_nid String 788982
attribute NC_GLOBAL projects_2_start_date String 2009-09
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 -56.0768
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String Compilation of surface measurements of bulk suspended particulate organic nitrogen (PON) collected from the Southern Ocean south of Africa (spanning 0-42\u00b0E). Date, time, latitude, and longitude are the averages of the start and end values of each underway collection.
attribute NC_GLOBAL time_coverage_start String 2012-07-20T18:54:00Z
attribute NC_GLOBAL title String Bulk suspended PON d15N from several cruises conducted in the Southern Ocean south of Africa from 2012-2019
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double 3.0E-4
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable cruise   String  
attribute cruise bcodmo_name String cruise_id
attribute cruise description String Cruise identifier
attribute cruise long_name String Cruise
attribute cruise units String unitless
variable leg   byte  
attribute leg _FillValue byte 127
attribute leg actual_range byte 1, 3
attribute leg bcodmo_name String leg
attribute leg description String Cruise leg
attribute leg long_name String Leg
attribute leg units String unitless
variable ship   String  
attribute ship bcodmo_name String ship
attribute ship description String Ship name
attribute ship long_name String Ship
attribute ship units String unitless
variable date   String  
attribute date bcodmo_name String date
attribute date description String Date; format: yyyy-mm-dd
attribute date long_name String Date
attribute date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute date source_name String date
attribute date time_precision String 1970-01-01
attribute date units String unitless
variable time2   String  
attribute time2 bcodmo_name String time
attribute time2 description String Time; format: HH:MM
attribute time2 long_name String Time
attribute time2 nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/ (external link)
attribute time2 units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double -56.0768, -34.4835
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; positive values = 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 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 3.0E-4, 41.9621
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; positive values = 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 standard_name String longitude
attribute longitude units String degrees_east
variable PONconc_avg   float  
attribute PONconc_avg _FillValue float NaN
attribute PONconc_avg actual_range float 0.19, 1.81
attribute PONconc_avg bcodmo_name String PON
attribute PONconc_avg description String Mean PON concentration. PON is the bulk (> 0.3 µm) particulate organic nitrogen in surface waters filtered from the ship's underway intake) concentration.
attribute PONconc_avg long_name String PONconc Avg
attribute PONconc_avg nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/MDMAP013/ (external link)
attribute PONconc_avg units String micrometers (µm)
variable PONconc_sd   float  
attribute PONconc_sd _FillValue float NaN
attribute PONconc_sd actual_range float 0.0, 1.22
attribute PONconc_sd bcodmo_name String PON
attribute PONconc_sd colorBarMaximum double 50.0
attribute PONconc_sd colorBarMinimum double 0.0
attribute PONconc_sd description String Standard deviation of PONconc_avg
attribute PONconc_sd long_name String PONconc Sd
attribute PONconc_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/MDMAP013/ (external link)
attribute PONconc_sd units String micrometers (µm)
variable PONconc_n   byte  
attribute PONconc_n _FillValue byte 127
attribute PONconc_n actual_range byte 2, 4
attribute PONconc_n bcodmo_name String num_reps
attribute PONconc_n description String Number of replicate measurements of PON
attribute PONconc_n long_name String PONconc N
attribute PONconc_n units String unitless
variable PONd15N_avg   float  
attribute PONd15N_avg _FillValue float NaN
attribute PONd15N_avg actual_range float -4.81, 7.7
attribute PONd15N_avg bcodmo_name String d15N
attribute PONd15N_avg description String Mean PON d15N. d15N is the nitrogen isotopic composition of a sample expressed in delta notation (d15N in units of per mil, ‰) relative to atmospheric N2, where d15N = {[(15N/14N)sample/(15N/14N)atmN2] – 1} × 1000.
attribute PONd15N_avg long_name String PONd15 N Avg
attribute PONd15N_avg units String per mil vs AIR
variable PONd15N_sd   float  
attribute PONd15N_sd _FillValue float NaN
attribute PONd15N_sd actual_range float 0.0, 0.84
attribute PONd15N_sd bcodmo_name String d15N
attribute PONd15N_sd colorBarMaximum double 50.0
attribute PONd15N_sd colorBarMinimum double 0.0
attribute PONd15N_sd description String Standard deviation of PONd15N_avg
attribute PONd15N_sd long_name String PONd15 N Sd
attribute PONd15N_sd units String per mil vs AIR
variable PONd15N_n   byte  
attribute PONd15N_n _FillValue byte 127
attribute PONd15N_n actual_range byte 2, 4
attribute PONd15N_n bcodmo_name String num_reps
attribute PONd15N_n description String Number of replicate measurements of PONd15N
attribute PONd15N_n long_name String PONd15 N N
attribute PONd15N_n units String unitless
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.34281044E9, NaN
attribute time axis String T
attribute time bcodmo_name String date
attribute time description String Date and time formatted to the ISO 8601 standard; format: yyyy-mm-ddTHH:MM
attribute time ioos_category String Time
attribute time long_name String ISO Date Time UTC
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (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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