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     data   graph     files  public 15N2-based N2 fixation rates from the Eastern Tropical South Pacific collected on the R/V
Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project)
   ?     I   M   background (external link) RSS BCO-DMO bcodmo_dataset_555666

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 Water column sample collection:\u00a0Samples were collected on the R/V
Atlantis in January through February 2010, and the R/V Melville in March
through April 2011 on a zonal transect along 20\u00ba S between 80\u00ba W and
100\u00ba W, with exact station locations and sample depths, nutrient
concentrations and isotopic compositions reported below. Water column samples
were collected by Niskin bottles deployed on a rosette equipped with
conductivity-temperature-depth (CTD) sensors. All samples were collected into
acid-washed, sample-rinsed HDPE bottles, and samples from the upper 400 m
passed a 0.2 \u00b5m filter before collection. All samples were stored at
-20\u00ba C until analysis on land.

15N2 fixation rate measurements: Short-term N2 fixation rate measurements
incubated with 15N2 gas from Sigma Aldrich (lot #s SZ1670V and MBBB0968V) were
carried out in acid-washed, sample-rinsed light transparent 4 L polycarbonate
bottles amended with 1.5 mL of 99% 15N2\u00a0 and 1.5 mL of 0.5M NaH13CO3.
Incubations were performed under simulated in situ conditions of temperature
and light and run for staggered periods (e.g. 0, 12, 24 and 48 hrs).
Incubations were terminated by filtration of the 4 L sample onto a
precombusted 25 mm Whatman GF/F, which was then analyzed by mass spectrometry
at the University of Southern California for d15N and d13C. During ESTP 1,
periodic time zero incubations were measured, with samples filtered within 5
to 10 minutes of injection of 15N2. Zero time enrichments were typically near
natural abundance levels with the greatest observed enrichment in 8
experiments at 23\u2030, essentially at natural abundance level for our tracer
experiments. We assumed natural abundance (0.3663 atom %) for calculations.
Limits of detection are about 10-14 \u00b5g for N and 6-10 \u00b5g for C.
Reproducibility as the standard deviation for isotopic analysis is about
\u00b10.3\u2030 for d15N and \u00b10.2\u2030 for d13C, and about \u00b10.1-0.2
\u00b5g for mass determinations.
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 Dr 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 Dr 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 nitrogen fixation rates
A. Knapp (FSU) et al
version: 2016-02-29
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.pl v1.0
attribute NC_GLOBAL date_created String 2015-04-10T14:28:52Z
attribute NC_GLOBAL date_modified String 2019-04-08T18:38:32Z
attribute NC_GLOBAL defaultDataQuery String &time
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 180.0
attribute NC_GLOBAL geospatial_vertical_min double 150.0
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/555666 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String CTD
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 555688
attribute NC_GLOBAL instruments_0_description String The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/130/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String CTD profiler
attribute NC_GLOBAL instruments_0_instrument_nid String 417
attribute NC_GLOBAL instruments_0_supplied_name String CTD
attribute NC_GLOBAL instruments_1_acronym String Gas Chromatograph
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 555772
attribute NC_GLOBAL instruments_1_description String Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB02/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Gas Chromatograph
attribute NC_GLOBAL instruments_1_instrument_nid String 661
attribute NC_GLOBAL instruments_1_supplied_name String Gas Chromatograph
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, cruise, cruise_id, data, dataset, date, depth, deviation, dmo, erddap, identifier, latitude, longitude, management, nfix, Nfix_stdev, Nfix_umol_N_m2_d, oceanography, office, preliminary, standard, standard deviation, station, statistics, stdev, time, umol
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/555666 (external link)
attribute NC_GLOBAL Northernmost_Northing double -15.0
attribute NC_GLOBAL param_mapping String {'555666': {'lat': 'master - latitude', 'depth': 'master - depth', 'lon': 'master - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/555666/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 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 Miami Rosenstiel School of Marine and Atmospheric Science
attribute NC_GLOBAL people_3_affiliation_acronym String UM-RSMAS
attribute NC_GLOBAL people_3_person_name String Dr Angela Knapp
attribute NC_GLOBAL people_3_person_nid String 555499
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 Florida State University
attribute NC_GLOBAL people_4_affiliation_acronym String FSU - EOAS
attribute NC_GLOBAL people_4_person_name String Dr Angela Knapp
attribute NC_GLOBAL people_4_person_nid String 555499
attribute NC_GLOBAL people_4_role String Contact
attribute NC_GLOBAL people_4_role_type String related
attribute NC_GLOBAL people_5_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_5_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_5_person_name String Nancy Copley
attribute NC_GLOBAL people_5_person_nid String 50396
attribute NC_GLOBAL people_5_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_5_role_type String related
attribute NC_GLOBAL project String Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific
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 Nancy Copley
attribute NC_GLOBAL publisher_role String BCO-DMO Data Manager(s)
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 v29
attribute NC_GLOBAL summary String 15N2 incubation-based N2 fixation rates, nitrate plus nitrite concentration and d15N, sediment trap PN mass flux and isotopic composition from the Eastern Tropical South Pacific, 2010 and 2011.
attribute NC_GLOBAL title String 15N2-based N2 fixation rates from the Eastern Tropical South Pacific 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() v1.0-alpha
variable cruise_id   String  
attribute cruise_id description String cruise_id
attribute cruise_id ioos_category String Identifier
attribute cruise_id long_name String Cruise Id
attribute cruise_id units String unitless
variable date   String  
attribute date description String sample collection date (local). Format:�yyyy-mm-dd
attribute date ioos_category String Time
attribute date long_name String Date
attribute date source_name String date
attribute date units String unitless
variable station   byte  
attribute station _FillValue byte 127
attribute station actual_range byte 1, 13
attribute station description String station
attribute station ioos_category String Identifier
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 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 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 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 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 150.0, 180.0
attribute depth axis String Z
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 positive String down
attribute depth standard_name String depth
attribute depth units String m
variable Nfix_umol_N_m2_d   byte  
attribute Nfix_umol_N_m2_d _FillValue byte 127
attribute Nfix_umol_N_m2_d actual_range byte 23, 98
attribute Nfix_umol_N_m2_d description String 24 hr 15N2 fixation rate
attribute Nfix_umol_N_m2_d ioos_category String Statistics
attribute Nfix_umol_N_m2_d long_name String Nfix Umol N M2 D
attribute Nfix_umol_N_m2_d units String umol N m-2 d-1
variable Nfix_stdev   short  
attribute Nfix_stdev _FillValue short 32767
attribute Nfix_stdev actual_range short 9, 129
attribute Nfix_stdev description String 24 hr 15N2 fixation rate standard deviation
attribute Nfix_stdev ioos_category String Unknown
attribute Nfix_stdev long_name String Nfix Stdev
attribute Nfix_stdev units String umol N m-2 d-1

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.


 
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