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Dataset Title:  d15N of size-fractionated particulate organic nitrogen (PON) from sediment
traps in the Sargasso Sea
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_747014)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
Variable ?   Optional
Constraint #1 ?
Constraint #2 ?
   Minimum ?
   Maximum ?
 mid_collection_date (unitless) ?          "2009-11-30"    "2010-11-16"
 bulk_d15N_500m (per mil) ?          -999.0    4.66
 bulk_d15N_1500m (per mil) ?          -999.0    5.12
 bulk_d15N_3200m (per mil) ?          -0.22    2.61
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  mid_collection_date {
    String bcodmo_name "date";
    String description "Collection date (yyyy-mm-dd)";
    String long_name "Mid Collection Date";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String source_name "mid_collection_date";
    String time_precision "1970-01-01";
    String units "unitless";
  bulk_d15N_500m {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 4.66;
    String bcodmo_name "d15N";
    String description "Bulk d15N (per mil vs. AIR) of the";
    String long_name "Bulk D15 N 500m";
    String units "per mil";
  bulk_d15N_1500m {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 5.12;
    String bcodmo_name "d15N";
    String description "Bulk d15N (per mil vs. AIR) of the";
    String long_name "Bulk D15 N 1500m";
    String units "per mil";
  bulk_d15N_3200m {
    Float32 _FillValue NaN;
    Float32 actual_range -0.22, 2.61;
    String bcodmo_name "d15N";
    String description "Bulk d15N (per mil vs. AIR) of the";
    String long_name "Bulk D15 N 3200m";
    String units "per mil";
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"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.";
    String awards_0_award_nid "55176";
    String awards_0_award_number "OCE-0960802";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=0960802";
    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 "Donald L. Rice";
    String awards_0_program_manager_nid "51467";
    String awards_1_award_nid "544342";
    String awards_1_award_number "OCE-1136345";
    String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1136345";
    String awards_1_funder_name "NSF Division of Ocean Sciences";
    String awards_1_funding_acronym "NSF OCE";
    String awards_1_funding_source_nid "355";
    String awards_1_program_manager "David L. Garrison";
    String awards_1_program_manager_nid "50534";
    String awards_2_award_nid "558188";
    String awards_2_award_number "OCE-1060947";
    String awards_2_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1060947";
    String awards_2_funder_name "NSF Division of Ocean Sciences";
    String awards_2_funding_acronym "NSF OCE";
    String awards_2_funding_source_nid "355";
    String awards_2_program_manager "Henrietta N Edmonds";
    String awards_2_program_manager_nid "51517";
    String cdm_data_type "Other";
    String comment 
"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";
    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 "2018-10-02T17:34:42Z";
    String date_modified "2020-01-10T18:58:01Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.1575/1912/bco-dmo.747014.1";
    String history 
"2024-05-24T00:39:58Z (local files)
2024-05-24T00:39:58Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_747014.html";
    String infoUrl "https://www.bco-dmo.org/dataset/747014";
    String institution "BCO-DMO";
    String instruments_0_acronym "IR Mass Spec";
    String instruments_0_dataset_instrument_description "The d15N of sinking PON was analyzed on the";
    String instruments_0_dataset_instrument_nid "747024";
    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 "Europa 20-20 or GV Isoprime";
    String instruments_1_acronym "Sediment Trap";
    String instruments_1_dataset_instrument_description "Bulk sinking PON was collected by sediment traps moored at 500 m, 1500 m, and 3200 m water depth.";
    String instruments_1_dataset_instrument_nid "747023";
    String instruments_1_description "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.";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/33/";
    String instruments_1_instrument_name "Sediment Trap";
    String instruments_1_instrument_nid "518";
    String instruments_1_supplied_name "sediment traps";
    String keywords "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";
    String license "https://www.bco-dmo.org/dataset/747014/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/747014";
    String param_mapping "{'747014': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/747014/parameters";
    String people_0_affiliation "Princeton University";
    String people_0_person_name "Daniel M. Sigman";
    String people_0_person_nid "51417";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Stellenbosch University";
    String people_1_person_name "Sandi M. Smart";
    String people_1_person_nid "557790";
    String people_1_role "Contact";
    String people_1_role_type "related";
    String people_2_affiliation "Woods Hole Oceanographic Institution";
    String people_2_affiliation_acronym "WHOI BCO-DMO";
    String people_2_person_name "Shannon Rauch";
    String people_2_person_nid "51498";
    String people_2_role "BCO-DMO Data Manager";
    String people_2_role_type "related";
    String project "N Isotopes Foraminifera";
    String projects_0_acronym "N Isotopes Foraminifera";
    String projects_0_description 
"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.";
    String projects_0_end_date "2016-03";
    String projects_0_geolocation "Sargasso Sea";
    String projects_0_name "Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study";
    String projects_0_project_nid "743583";
    String projects_0_start_date "2011-04";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "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).";
    String title "d15N of size-fractionated particulate organic nitrogen (PON) from sediment traps in the Sargasso Sea";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.3";


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