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Title Sum-
Institution Dataset ID
     data   graph     files  public PNsink mass flux and d15N from floating sediment trap deployments collected on the R/V
Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project)
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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
attribute NC_GLOBAL acquisition_description String Sinking particulate nitrogen (PNsink) mass and d15N analysis:\u00a0Sinking
particulate material was collected using surface-tethered floating particle-
interceptor traps (PIT) equipped with 12 polycarbonate cylinders, deployed for
up to 70 hours. Floating sediment traps were deployed at 200 m at Stations 3
and 5 on the 2010 cruise; for all other stations, traps were deployed at 100
m. Sediment trap samples were collected into a brine solution and then
filtered and split into replicate samples. In most cases, two splits were
collected from each sediment trap, one of which was acidified to remove
inorganic carbon. In 2010 filtration removed the contribution of
\u201cswimmers\u201d from sediment trap material.\u00a0On the 2011 cruise,
\u201cswimmers\u201d were identified by dissecting microscopy and hand-picked
from sediment trap samples using sterilized micropipettors and forceps to
remove their isotopic contribution to the sinking flux. Mass and isotopic
fluxes were determined by dividing the mass of sinking particulate material
captured in each trap by the trap surface area and by the duration (hrs) of
trap deployment. Subsequently, the total mass flux was multiplied by the %N
determined by combustion analysis of trap samples at the UC Davis Stable
Isotope Facility to calculate PNsink mass fluxes; the d15N of trap samples was
determined at the same time. The limit of detection for combustion analysis is
1.5 \u00b5mols N and the precision of the d15N measurement is + 0.3\u2030. No
systematic difference was observed in the d15N of acidified vs. non-acidified
trap samples.


Soutar, A., Kling, S. A., Crill, P. A. & Duffrin, E. MONITORING MARINE-
ENVIRONMENT THROUGH SEDIMENTATION. Nature 266, 136-139, doi:10.1038/266136a0

Knauer, G. A., Martin, J. H. & Bruland, K. W. Fluxes of particulate carbon,
nitrogen, and phosphorus in the upper water column of the northeast Pacific.
Deep-Sea Research 26, 97-108, doi:10.1016/0198-0149(79)90089-X (1979).
attribute NC_GLOBAL awards_0_award_nid String 55039
attribute NC_GLOBAL awards_0_award_number String OCE-0850801
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850801 (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 55105
attribute NC_GLOBAL awards_1_award_number String OCE-0850905
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850905 (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 Donald L. Rice
attribute NC_GLOBAL awards_1_program_manager_nid String 51467
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String sediment trap PN flux
A. Knapp (FSU) et al
version: 2015-04-09
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 2015-04-10T15:19:18Z
attribute NC_GLOBAL date_modified String 2016-08-20T03:10:46Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/7227
attribute NC_GLOBAL Easternmost_Easting double -80.0
attribute NC_GLOBAL geospatial_lat_max double -15.0
attribute NC_GLOBAL geospatial_lat_min double -20.0
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -80.0
attribute NC_GLOBAL geospatial_lon_min double -100.0
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max double 200.0
attribute NC_GLOBAL geospatial_vertical_min double 100.0
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/555713 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Sed Trap - Float
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 555733
attribute NC_GLOBAL instruments_0_description String Floating sediment traps are specially designed sampling devices deployed to float in the water column (as opposed to being secured to a mooring at a fixed depth) for periods of time to collect particles from the water column that are falling toward the sea floor. In general a sediment trap has a container 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. The 'Sediment Trap -Floating' designation is used for a floating type of sediment trap about which no other design details are known.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/33/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Sediment Trap - Floating
attribute NC_GLOBAL instruments_0_instrument_nid String 523
attribute NC_GLOBAL instruments_0_supplied_name String Sed Trap - Float
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 555762
attribute NC_GLOBAL instruments_1_description String Instruments that generate enlarged images of samples using the phenomena of reflection and absorption of visible light. Includes conventional and inverted instruments. Also called a "light microscope".
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB05/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Microscope-Optical
attribute NC_GLOBAL instruments_1_instrument_nid String 708
attribute NC_GLOBAL instruments_1_supplied_name String dissecting microscope
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, cruise, cruise_id, data, dataset, date, del15, del15N_PNsink, del15N_PNsink_sd, depth, dmo, duration, erddap, flux, latitude, longitude, management, oceanography, office, per, pnsink, PNsink_flux, PNsink_flux_sd, preliminary, station, time, traps, traps_per_depth
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/555713/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/555713 (external link)
attribute NC_GLOBAL Northernmost_Northing double -15.0
attribute NC_GLOBAL param_mapping String {'555713': {'lat': 'master - latitude', 'depth': 'master - depth', 'lon': 'master - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/555713/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of Southern California
attribute NC_GLOBAL people_0_affiliation_acronym String USC-WIES
attribute NC_GLOBAL people_0_person_name String Douglas G. Capone
attribute NC_GLOBAL people_0_person_nid String 50669
attribute NC_GLOBAL people_0_role String Lead Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String University of Southern California
attribute NC_GLOBAL people_1_affiliation_acronym String USC-WIES
attribute NC_GLOBAL people_1_person_name String William M. Berelson
attribute NC_GLOBAL people_1_person_nid String 50600
attribute NC_GLOBAL people_1_role String Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String University of Miami Rosenstiel School of Marine and Atmospheric Science
attribute NC_GLOBAL people_2_affiliation_acronym String UM-RSMAS
attribute NC_GLOBAL people_2_person_name String Dennis Hansell
attribute NC_GLOBAL people_2_person_nid String 50539
attribute NC_GLOBAL people_2_role String Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
attribute NC_GLOBAL people_3_affiliation String University of Southern California
attribute NC_GLOBAL people_3_affiliation_acronym String USC
attribute NC_GLOBAL people_3_person_name String Douglas Hammond
attribute NC_GLOBAL people_3_person_nid String 50733
attribute NC_GLOBAL people_3_role String Co-Principal Investigator
attribute NC_GLOBAL people_3_role_type String originator
attribute NC_GLOBAL people_4_affiliation String University of Miami Rosenstiel School of Marine and Atmospheric Science
attribute NC_GLOBAL people_4_affiliation_acronym String UM-RSMAS
attribute NC_GLOBAL people_4_person_name String Angela N. Knapp
attribute NC_GLOBAL people_4_person_nid String 555499
attribute NC_GLOBAL people_4_role String Co-Principal Investigator
attribute NC_GLOBAL people_4_role_type String originator
attribute NC_GLOBAL people_5_affiliation String University of Southern California
attribute NC_GLOBAL people_5_affiliation_acronym String USC-WIES
attribute NC_GLOBAL people_5_person_name String Maria Prokopenko
attribute NC_GLOBAL people_5_person_nid String 675316
attribute NC_GLOBAL people_5_role String Scientist
attribute NC_GLOBAL people_5_role_type String originator
attribute NC_GLOBAL people_6_affiliation String Florida State University
attribute NC_GLOBAL people_6_affiliation_acronym String FSU - EOAS
attribute NC_GLOBAL people_6_person_name String Angela N. Knapp
attribute NC_GLOBAL people_6_person_nid String 555499
attribute NC_GLOBAL people_6_role String Contact
attribute NC_GLOBAL people_6_role_type String related
attribute NC_GLOBAL people_7_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_7_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_7_person_name String Nancy Copley
attribute NC_GLOBAL people_7_person_nid String 50396
attribute NC_GLOBAL people_7_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_7_role_type String related
attribute NC_GLOBAL project String N2 fixation ETSP
attribute NC_GLOBAL projects_0_acronym String N2 fixation ETSP
attribute NC_GLOBAL projects_0_description String Description from NSF award abstract:
Several independent lines of geochemical and remote sensing evidence suggest that dinitrogen (N2) fixation may be associated with surface waters downstream of major oxygen minimum zones (OMZs) and in particular in the Eastern Tropical South Pacific (ETSP). However, little direct evidence supports these inferences. Besides substantiating these indirect assessments, documenting significant N2 fixation in the ETSP would provide insight into two longstanding controversies: Is the marine N budget balanced, as implied by modeling and paleoceanographic data, and if so, how are the processes that add and remove N spatially, and thus temporally coupled?
In this project researchers at the University of Southern California and the University of Miami will test the hypothesis that fixation occurs in the ETSP at areal rates that equal or exceed those previously documented in more well-studied regions such as the oligotrophic waters of the sub/tropical North Atlantic. If scaled to the surface area of ETSP waters, this could add an additional 10-50 Tg N per year of inputs to the global marine N budget. They will undertake two cruises in the ETSP during early and late summer in two consecutive years to assess the quantitative significance of N2 fixation as a source of new N to surface waters using complementary biological and geochemical tools. N2 fixation rates will be evaluated on two temporal/spatial scales: daily/local (bottle 15N2 incubations and floating sediment traps); and seasonal/regional (d15N budget using moored sediment traps and water column TDN d15N). These estimates provide detailed observations of potential N2 fixation during station occupation in two summer seasons, when rates are expected to be greatest, as well as prolonged observation over lower expected N2 fixation periods. A combination of these different estimates will aim to determine if N2 fixation in this region can help balance the marine N budget. If all goes as planned, this study will determine the quantitative importance of N2 fixation in the ETSP, and whether these previously undocumented rates can help resolve the marine N budget. Implications include the ability of the marine N cycle to maintain homeostasis, and thus the global C cycle on glacial/interglacial time scales.
attribute NC_GLOBAL projects_0_end_date String 2012-07
attribute NC_GLOBAL projects_0_geolocation String Eastern Tropical South Pacific
attribute NC_GLOBAL projects_0_name String Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific
attribute NC_GLOBAL projects_0_project_nid String 555496
attribute NC_GLOBAL projects_0_start_date String 2009-08
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 -20.0
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String PNsink mass flux and d15N from floating sediment trap deployments
attribute NC_GLOBAL title String PNsink mass flux and d15N from floating sediment trap deployments collected on the R/V Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -100.0
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 cruise_id
attribute cruise_id long_name String Cruise Id
attribute cruise_id units String unitless
variable date   String  
attribute date bcodmo_name String date_local
attribute date description String sample collection date (local). Format: yyyy-mm-dd
attribute date long_name String Date
attribute date source_name String date
attribute date time_precision String 1970-01-01
attribute date units String unitless
variable station   byte  
attribute station _FillValue byte 127
attribute station actual_range byte 1, 13
attribute station bcodmo_name String sta
attribute station description String station
attribute station long_name String Station
attribute station units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double -20.0, -15.0
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; north is positive
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 -100.0, -80.0
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; east is positive
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 depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth _FillValue double NaN
attribute depth actual_range double 100.0, 200.0
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 trap was deployed
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 traps_per_depth   byte  
attribute traps_per_depth _FillValue byte 127
attribute traps_per_depth actual_range byte 1, 2
attribute traps_per_depth bcodmo_name String num_reps
attribute traps_per_depth description String Number of traps deployed per depth (Total # sample splits)
attribute traps_per_depth long_name String Traps Per Depth
attribute traps_per_depth units String unit
variable duration   byte  
attribute duration _FillValue byte 127
attribute duration actual_range byte 35, 70
attribute duration bcodmo_name String duration
attribute duration description String Length of trap deployment
attribute duration long_name String Duration
attribute duration units String hours
variable PNsink_flux   float  
attribute PNsink_flux _FillValue float NaN
attribute PNsink_flux actual_range float 0.027, 0.317
attribute PNsink_flux bcodmo_name String PNsink
attribute PNsink_flux description String Particulate Nitrogen sinking mass flux
attribute PNsink_flux long_name String PNsink Flux
attribute PNsink_flux units String milli mol N m-2 d-1
variable PNsink_flux_sd   float  
attribute PNsink_flux_sd _FillValue float NaN
attribute PNsink_flux_sd actual_range float 0.02, 0.06
attribute PNsink_flux_sd bcodmo_name String standard deviation
attribute PNsink_flux_sd colorBarMaximum double 50.0
attribute PNsink_flux_sd colorBarMinimum double 0.0
attribute PNsink_flux_sd description String Particulate Nitrogen sinking mass flux; 1 standard deviation
attribute PNsink_flux_sd long_name String PNsink Flux Sd
attribute PNsink_flux_sd units String milli mol N m-2 d-1
variable del15N_PNsink   float  
attribute del15N_PNsink _FillValue float NaN
attribute del15N_PNsink actual_range float 7.9, 13.7
attribute del15N_PNsink bcodmo_name String delta 15N PN sink
attribute del15N_PNsink description String Particulate Nitrogen sinking flux d15N (per mil relative to N2 in air)
attribute del15N_PNsink long_name String Del15 N PNsink
attribute del15N_PNsink units String per mil
variable del15N_PNsink_sd   float  
attribute del15N_PNsink_sd _FillValue float NaN
attribute del15N_PNsink_sd actual_range float 0.1, 2.3
attribute del15N_PNsink_sd bcodmo_name String standard deviation
attribute del15N_PNsink_sd colorBarMaximum double 50.0
attribute del15N_PNsink_sd colorBarMinimum double 0.0
attribute del15N_PNsink_sd description String Particulate Nitrogen sinking flux d15N (per mil relative to N2 in air); 1 standard deviation
attribute del15N_PNsink_sd long_name String Del15 N PNsink Sd
attribute del15N_PNsink_sd 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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