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Title Sum-
Institution Dataset ID
     data   graph     files  public d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso
Sea at BATS and Hydro Station S
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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
attribute NC_GLOBAL acquisition_description String PON samples were collected from the upper 200 m of the water column using a
1-m2, 200-um-mesh plankton net aboard the R/V Atlantic Explorer during ten
cruises between July 2011 and November 2013. Approximately 10% of the tow
material was size-fractionated and freeze-dried for elemental and isotopic
analysis of PON. See methods section of Smart et al. (2018) for more details
of sample collection, isotope analysis, and data quality.

The d15N of tow-collected, size-fractionated PON was determined by elemental
analyzer-isotope ratio mass spectrometry (an Elementar Vario Isotope Cube
online to an Elementar Isoprime visION), referencing to atmospheric N2 using
USGS-40 and an in-house aminocaproic acid standard.
attribute NC_GLOBAL awards_0_award_nid String 55176
attribute NC_GLOBAL awards_0_award_number String OCE-0960802
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=0960802 (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 awards_1_award_nid String 544342
attribute NC_GLOBAL awards_1_award_number String OCE-1136345
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1136345 (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 David L. Garrison
attribute NC_GLOBAL awards_1_program_manager_nid String 50534
attribute NC_GLOBAL awards_2_award_nid String 558188
attribute NC_GLOBAL awards_2_award_number String OCE-1060947
attribute NC_GLOBAL awards_2_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=1060947 (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 Henrietta N Edmonds
attribute NC_GLOBAL awards_2_program_manager_nid String 51517
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Size-fractionated particulate organic nitrogen isotopes from Sargasso Sea plankton net tows
Data published in: Smart et al. (2018) - https://doi.org/10.1016j.gca.2018.05.023
PI: Daniel M. Sigman (Princeton)
Contact: Sandi Smart (Stellenbosch University & The Max Planck Institute for Chemistry)
Version date: 01 October 2018
-999 = missing data
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 2018-10-01T18:23:33Z
attribute NC_GLOBAL date_modified String 2020-01-10T18:56:24Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.746854.1
attribute NC_GLOBAL geospatial_vertical_max double 220.0
attribute NC_GLOBAL geospatial_vertical_min double 7.0
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/746854 (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_description String The d15N of tow-collected, size-fractionated PON was determined by elemental analyzer-isotope ratio mass spectrometry (an Elementar Vario Isotope Cube online to an Elementar Isoprime visION), referencing to atmospheric N2 using USGS-40 and an in-house aminocaproic acid standard.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 746870
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 Elementar Isoprime visION
attribute NC_GLOBAL instruments_1_acronym String Plankton Net
attribute NC_GLOBAL instruments_1_dataset_instrument_description String PON samples were collected from the upper 200 m of the water column using a 1-m2, 200-μm-mesh plankton net.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 746869
attribute NC_GLOBAL instruments_1_description String A Plankton Net is a generic term for a sampling net that is used to collect plankton. It is used only when detailed instrument documentation is not available.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/22/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Plankton Net
attribute NC_GLOBAL instruments_1_instrument_nid String 525
attribute NC_GLOBAL instruments_1_supplied_name String mesh plankton net
attribute NC_GLOBAL instruments_2_dataset_instrument_description String The d15N of tow-collected, size-fractionated PON was determined by elemental analyzer-isotope ratio mass spectrometry (an Elementar Vario Isotope Cube online to an Elementar Isoprime visION), referencing to atmospheric N2 using USGS-40 and an in-house aminocaproic acid standard.
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 746871
attribute NC_GLOBAL instruments_2_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_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB01/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String Elemental Analyzer
attribute NC_GLOBAL instruments_2_instrument_nid String 546339
attribute NC_GLOBAL instruments_2_supplied_name String Elementar Vario Isotope Cube
attribute NC_GLOBAL keywords String average, bco, bco-dmo, biological, chemical, cruise, d15, d15N_AVG, d15N_stdev, data, dataset, date, depth, deviation, dmo, erddap, fraction, management, measurements, num, num_measurements, oceanography, office, preliminary, size, size_fraction, standard, standard deviation, stdev
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/746854/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/746854 (external link)
attribute NC_GLOBAL param_mapping String {'746854': {'depth': 'master - depth'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/746854/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 N Isotopes Foraminifera
attribute NC_GLOBAL projects_0_acronym String N Isotopes Foraminifera
attribute NC_GLOBAL projects_0_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_0_end_date String 2016-03
attribute NC_GLOBAL projects_0_geolocation String Sargasso Sea
attribute NC_GLOBAL projects_0_name String Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study
attribute NC_GLOBAL projects_0_project_nid String 743583
attribute NC_GLOBAL projects_0_start_date String 2011-04
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 standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Net tow samples from 0-200 m at BATS (31\u00b040\u2019N, 64\u00b010\u2019W) and Hydro Station S (32\u00b010\u2019N, 64\u00b034\u2019W).
attribute NC_GLOBAL title String d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso Sea at BATS and Hydro Station S
attribute NC_GLOBAL version String 1
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 date   String  
attribute date bcodmo_name String date
attribute date description String Date of collection (month and 2-digit year)
attribute date long_name String Date
attribute date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute date 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 7.0, 220.0
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 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 size_fraction   String  
attribute size_fraction bcodmo_name String samp_fraction
attribute size_fraction description String Size fraction
attribute size_fraction long_name String Size Fraction
attribute size_fraction units String micrometers (um)
variable d15N_AVG   float  
attribute d15N_AVG _FillValue float NaN
attribute d15N_AVG actual_range float 1.43, 6.56
attribute d15N_AVG bcodmo_name String d15N
attribute d15N_AVG description String Average d15N (per mil vs. AIR). 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 d15N_AVG long_name String D15 N AVG
attribute d15N_AVG units String per mil
variable d15N_stdev   float  
attribute d15N_stdev _FillValue float NaN
attribute d15N_stdev actual_range float 0.0, 0.55
attribute d15N_stdev bcodmo_name String d15N
attribute d15N_stdev description String Standard deviation of d15N_AVG
attribute d15N_stdev long_name String D15 N Stdev
attribute d15N_stdev units String per mil
variable num_measurements   byte  
attribute num_measurements _FillValue byte 127
attribute num_measurements actual_range byte 2, 6
attribute num_measurements bcodmo_name String numb_obs
attribute num_measurements description String Number of measurements
attribute num_measurements long_name String Num Measurements
attribute num_measurements units String unitless

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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