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Title Sum-
Institution Dataset ID
     data   graph     files  public d15N of size-fractionated particulate organic nitrogen (PON) from sediment traps in the
Sargasso Sea
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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 Bulk sinking PON was collected by sediment traps moored at 500 m, 1500 m, and
3200 m water depth (Conte et al., 2001; Conte and Weber, 2014) between
November 2009 and November 2010, with each sample representing a two-week
collection. Isotope measurements were made on the <125 um size fraction. See
methods section of Smart et al. (2018) for more details of sample collection,
isotope analysis and data quality.

The d15N of sinking PON was analyzed on the <125 um size fraction of sediment
trap samples by mass spectrometry using either a Europa 20-20 or GV Isoprime
mass spectrometer.
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 Bulk particulate organic nitrogen isotopes from Sargasso Sea sediment traps
Data published in: Smart et al. (2018) - https://doi.org/10.1016/j.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 2018-10-02T17:34:42Z
attribute NC_GLOBAL date_modified String 2020-01-10T18:58:01Z
attribute NC_GLOBAL defaultDataQuery String &amp;time&lt;now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.747014.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/747014 (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 sinking PON was analyzed on the
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 747024
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 Europa 20-20 or GV Isoprime
attribute NC_GLOBAL instruments_1_acronym String Sediment Trap
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Bulk sinking PON was collected by sediment traps moored at 500 m, 1500 m, and 3200 m water depth.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 747023
attribute NC_GLOBAL instruments_1_description String Sediment traps are specially designed containers deployed in the water column for periods of time to collect particles from the water column falling toward the sea floor. In general a sediment trap has a jar at the bottom to collect the sample and a broad funnel-shaped opening at the top with baffles to keep out very large objects and help prevent the funnel from clogging. This designation is used when the specific type of sediment trap was not specified by the contributing investigator.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/33/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Sediment Trap
attribute NC_GLOBAL instruments_1_instrument_nid String 518
attribute NC_GLOBAL instruments_1_supplied_name String sediment traps
attribute NC_GLOBAL keywords String 1500m, 3200m, 500m, bco, bco-dmo, biological, bulk, bulk_d15N_1500m, bulk_d15N_3200m, bulk_d15N_500m, chemical, collection, d15, data, dataset, date, dmo, erddap, management, mid, oceanography, office, preliminary, time
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/747014/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/747014 (external link)
attribute NC_GLOBAL param_mapping String {'747014': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/747014/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 sediment traps n the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Sediment traps from 500 m, 1500 m, and 3200 m water depth (31\u00b050\u2019N, 64\u00b010\u2019W).
attribute NC_GLOBAL title String d15N of size-fractionated particulate organic nitrogen (PON) from sediment traps in the Sargasso Sea
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable mid_collection_date   String  
attribute mid_collection_date bcodmo_name String date
attribute mid_collection_date description String Collection date (yyyy-mm-dd)
attribute mid_collection_date long_name String Mid Collection Date
attribute mid_collection_date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute mid_collection_date source_name String mid_collection_date
attribute mid_collection_date time_precision String 1970-01-01
attribute mid_collection_date units String unitless
variable bulk_d15N_500m   float  
attribute bulk_d15N_500m _FillValue float NaN
attribute bulk_d15N_500m actual_range float -999.0, 4.66
attribute bulk_d15N_500m bcodmo_name String d15N
attribute bulk_d15N_500m description String Bulk d15N (per mil vs. AIR) of the
attribute bulk_d15N_500m long_name String Bulk D15 N 500m
attribute bulk_d15N_500m units String per mil
variable bulk_d15N_1500m   float  
attribute bulk_d15N_1500m _FillValue float NaN
attribute bulk_d15N_1500m actual_range float -999.0, 5.12
attribute bulk_d15N_1500m bcodmo_name String d15N
attribute bulk_d15N_1500m description String Bulk d15N (per mil vs. AIR) of the
attribute bulk_d15N_1500m long_name String Bulk D15 N 1500m
attribute bulk_d15N_1500m units String per mil
variable bulk_d15N_3200m   float  
attribute bulk_d15N_3200m _FillValue float NaN
attribute bulk_d15N_3200m actual_range float -0.22, 2.61
attribute bulk_d15N_3200m bcodmo_name String d15N
attribute bulk_d15N_3200m description String Bulk d15N (per mil vs. AIR) of the
attribute bulk_d15N_3200m long_name String Bulk D15 N 3200m
attribute bulk_d15N_3200m 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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