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Dataset Title:  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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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_555713)
Range: longitude = -100.0 to -80.0°E, latitude = -20.0 to -15.0°N, depth = 100.0 to 200.0m
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Data Access Form | Files
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Things You Can Do With Your Graphs

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  cruise_id {
    String bcodmo_name "cruise_id";
    String description "cruise_id";
    String long_name "Cruise Id";
    String units "unitless";
  date {
    String bcodmo_name "date_local";
    String description "sample collection date (local). Format: yyyy-mm-dd";
    String long_name "Date";
    String source_name "date";
    String time_precision "1970-01-01";
    String units "unitless";
  station {
    Byte _FillValue 127;
    Byte actual_range 1, 13;
    String bcodmo_name "sta";
    String description "station";
    String long_name "Station";
    String units "unitless";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range -20.0, -15.0;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "latitude; north is positive";
    String ioos_category "Location";
    String long_name "Latitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
    String standard_name "latitude";
    String units "degrees_north";
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -100.0, -80.0;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "longitude; east is positive";
    String ioos_category "Location";
    String long_name "Longitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
    String standard_name "longitude";
    String units "degrees_east";
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue NaN;
    Float64 actual_range 100.0, 200.0;
    String axis "Z";
    String bcodmo_name "depth";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Depth trap was deployed";
    String ioos_category "Location";
    String long_name "Depth";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
    String positive "down";
    String standard_name "depth";
    String units "m";
  traps_per_depth {
    Byte _FillValue 127;
    Byte actual_range 1, 2;
    String bcodmo_name "num_reps";
    String description "Number of traps deployed per depth (Total # sample splits)";
    String long_name "Traps Per Depth";
    String units "unit";
  duration {
    Byte _FillValue 127;
    Byte actual_range 35, 70;
    String bcodmo_name "duration";
    String description "Length of trap deployment";
    String long_name "Duration";
    String units "hours";
  PNsink_flux {
    Float32 _FillValue NaN;
    Float32 actual_range 0.027, 0.317;
    String bcodmo_name "PNsink";
    String description "Particulate Nitrogen sinking mass flux";
    String long_name "PNsink Flux";
    String units "milli mol N m-2 d-1";
  PNsink_flux_sd {
    Float32 _FillValue NaN;
    Float32 actual_range 0.02, 0.06;
    String bcodmo_name "standard deviation";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String description "Particulate Nitrogen sinking mass flux; 1 standard deviation";
    String long_name "PNsink Flux Sd";
    String units "milli mol N m-2 d-1";
  del15N_PNsink {
    Float32 _FillValue NaN;
    Float32 actual_range 7.9, 13.7;
    String bcodmo_name "delta 15N PN sink";
    String description "Particulate Nitrogen sinking flux d15N (per mil relative to N2 in air)";
    String long_name "Del15 N PNsink";
    String units "per mil";
  del15N_PNsink_sd {
    Float32 _FillValue NaN;
    Float32 actual_range 0.1, 2.3;
    String bcodmo_name "standard deviation";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String description "Particulate Nitrogen sinking flux d15N (per mil relative to N2 in air); 1 standard deviation";
    String long_name "Del15 N PNsink Sd";
    String units "per mil";
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
    String acquisition_description 
"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).";
    String awards_0_award_nid "55039";
    String awards_0_award_number "OCE-0850801";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850801";
    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 "55105";
    String awards_1_award_number "OCE-0850905";
    String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850905";
    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 "Donald L. Rice";
    String awards_1_program_manager_nid "51467";
    String cdm_data_type "Other";
    String comment 
"sediment trap PN flux 
   A. Knapp (FSU) et al 
   version: 2015-04-09";
    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 "2015-04-10T15:19:18Z";
    String date_modified "2016-08-20T03:10:46Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/7227";
    Float64 Easternmost_Easting -80.0;
    Float64 geospatial_lat_max -15.0;
    Float64 geospatial_lat_min -20.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -80.0;
    Float64 geospatial_lon_min -100.0;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 200.0;
    Float64 geospatial_vertical_min 100.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2022-08-19T01:50:08Z (local files)
2022-08-19T01:50:08Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_555713.das";
    String infoUrl "https://www.bco-dmo.org/dataset/555713";
    String institution "BCO-DMO";
    String instruments_0_acronym "Sed Trap - Float";
    String instruments_0_dataset_instrument_nid "555733";
    String instruments_0_description "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.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/33/";
    String instruments_0_instrument_name "Sediment Trap - Floating";
    String instruments_0_instrument_nid "523";
    String instruments_0_supplied_name "Sed Trap - Float";
    String instruments_1_dataset_instrument_nid "555762";
    String instruments_1_description "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\".";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB05/";
    String instruments_1_instrument_name "Microscope-Optical";
    String instruments_1_instrument_nid "708";
    String instruments_1_supplied_name "dissecting microscope";
    String keywords "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";
    String license "https://www.bco-dmo.org/dataset/555713/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/555713";
    Float64 Northernmost_Northing -15.0;
    String param_mapping "{'555713': {'lat': 'master - latitude', 'depth': 'master - depth', 'lon': 'master - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/555713/parameters";
    String people_0_affiliation "University of Southern California";
    String people_0_affiliation_acronym "USC-WIES";
    String people_0_person_name "Douglas G. Capone";
    String people_0_person_nid "50669";
    String people_0_role "Lead Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "University of Southern California";
    String people_1_affiliation_acronym "USC-WIES";
    String people_1_person_name "William M. Berelson";
    String people_1_person_nid "50600";
    String people_1_role "Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "University of Miami Rosenstiel School of Marine and Atmospheric Science";
    String people_2_affiliation_acronym "UM-RSMAS";
    String people_2_person_name "Dennis Hansell";
    String people_2_person_nid "50539";
    String people_2_role "Principal Investigator";
    String people_2_role_type "originator";
    String people_3_affiliation "University of Southern California";
    String people_3_affiliation_acronym "USC";
    String people_3_person_name "Douglas Hammond";
    String people_3_person_nid "50733";
    String people_3_role "Co-Principal Investigator";
    String people_3_role_type "originator";
    String people_4_affiliation "University of Miami Rosenstiel School of Marine and Atmospheric Science";
    String people_4_affiliation_acronym "UM-RSMAS";
    String people_4_person_name "Angela N. Knapp";
    String people_4_person_nid "555499";
    String people_4_role "Co-Principal Investigator";
    String people_4_role_type "originator";
    String people_5_affiliation "University of Southern California";
    String people_5_affiliation_acronym "USC-WIES";
    String people_5_person_name "Maria Prokopenko";
    String people_5_person_nid "675316";
    String people_5_role "Scientist";
    String people_5_role_type "originator";
    String people_6_affiliation "Florida State University";
    String people_6_affiliation_acronym "FSU - EOAS";
    String people_6_person_name "Angela N. Knapp";
    String people_6_person_nid "555499";
    String people_6_role "Contact";
    String people_6_role_type "related";
    String people_7_affiliation "Woods Hole Oceanographic Institution";
    String people_7_affiliation_acronym "WHOI BCO-DMO";
    String people_7_person_name "Nancy Copley";
    String people_7_person_nid "50396";
    String people_7_role "BCO-DMO Data Manager";
    String people_7_role_type "related";
    String project "N2 fixation ETSP";
    String projects_0_acronym "N2 fixation ETSP";
    String projects_0_description 
"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.";
    String projects_0_end_date "2012-07";
    String projects_0_geolocation "Eastern Tropical South Pacific";
    String projects_0_name "Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific";
    String projects_0_project_nid "555496";
    String projects_0_start_date "2009-08";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -20.0;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "PNsink mass flux and d15N from floating sediment trap deployments";
    String title "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)";
    String version "1";
    Float64 Westernmost_Easting -100.0;
    String xml_source "osprey2erddap.update_xml() v1.3";


Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form
For example,
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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