Accessing BCO-DMO data
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| Dataset Title: | [GT10 - Nanomolar Nutrients - Surface] - PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_3470) |
| Information: | Summary
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.";
String long_name "Cruise Id";
String units "text";
}
GeoFish_id {
Int16 _FillValue 32767;
Int16 actual_range 1, 201;
String bcodmo_name "sample";
String description
"Identifying number of a GeoFish tow, numbered consecutively within a cruise. PI-supplied values were identical to those in the intermediate US GEOTRACES master file.
Originally submitted as 'Fish_ID', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Geo Fish Id";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "integer";
}
event_GEOTRC {
Int16 _FillValue 32767;
Int16 actual_range 2032, 2215;
String bcodmo_name "event";
String description "Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "Event GEOTRC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "dimensionless";
}
GeoTraces_ID {
Int16 _FillValue 32767;
Int16 actual_range 5157, 6000;
String bcodmo_name "dataset_id";
String description "Unique identifiers for ALL vertical profile samples (and surface fish samples when we arrive on station, or depart).";
String long_name "Geo Traces ID";
String units "integer";
}
sample_GEOTRC {
Int16 _FillValue 32767;
Int16 actual_range 5157, 6000;
String bcodmo_name "sample";
String description
"Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01.
Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "Sample GEOTRC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "dimensionless";
}
date {
Int32 _FillValue 2147483647;
Int32 actual_range 20101017, 20101125;
String bcodmo_name "date";
String description "date (GMT) in the format YYYYMMDD";
String long_name "Date";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String units "unitless";
}
time2 {
String bcodmo_name "time";
String description "time (GMT)";
String long_name "Time";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "HHMM";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 16.8546, 38.34679;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Station latitude (South is negative)";
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 -78.9949, -9.60547;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Station longitude (West is negative)";
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";
}
PO4 {
Float32 _FillValue NaN;
Float32 actual_range 0.5, 70.3;
String bcodmo_name "PO4";
String description "PO4: phosphate (reactive - or ortho-phosphate)";
String long_name "Mass Concentration Of Phosphate In Sea Water";
String units "nmol/L";
}
PO4_Flag {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 6, 6;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "PO4 Data Flag: Samples were measured in triplicate (flag=6); Samples out of linear calibration range for LWCC (flag=10)";
String long_name "PO4 Flag";
String units "integer";
}
NO3 {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 104.1;
String bcodmo_name "NO3";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "NO3: Nitrate = (Nitrate+nitrite) - nitrite";
String long_name "Mole Concentration Of Nitrate In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/NTRAIGGS/";
String units "nmol/L";
}
NO3_Flag {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 6, 6;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "NO3 Data Flag: Samples were measured in triplicate (flag=6); Samples out of linear calibration range for LWCC (flag=10)";
String long_name "NO3 Flag";
String units "integer";
}
NO2 {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 27.0;
String bcodmo_name "NO2";
Float64 colorBarMaximum 1.0;
Float64 colorBarMinimum 0.0;
String description "NO2: Nitrite";
String long_name "Mole Concentration Of Nitrite In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/NTRIAAZX/";
String units "nmol/L";
}
NO2_Flag {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 6, 6;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "NO2 Data Flag: Samples were measured in triplicate (flag=6); Samples out of linear calibration range for LWCC (flag=10)";
String long_name "NO2 Flag";
String units "integer";
}
Remarks {
String bcodmo_name "activity_and_comments";
String description "Remarks";
String long_name "Remarks";
String units "text";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.28733828e+9, 1.29070734e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date/Time (UTC) formatted to ISO8601. T indicates start of time string; Z indicates UTC. Calculated from the original date and time fields.";
String ioos_category "Time";
String long_name "ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DateTime_UTC";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00.00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Filtered (0.4 \\u00b5m) water samples from the Geotraces surface tow-fish and
water from the upper 200 m water column (GEOTRACES Carousel/GoFlo system) were
analyzed on an Astoria Pacific 300 series gas-segmented continuous flow
nutrient auto-analyzer modified with 200 cm liquid waveguide capillary cells
(LWCC; World Precision Instruments). Nitrate was reduced to nitrite using a
Cd-column, then determined spectrophotometrically following formation of a
highly colored dye, but slightly modified for use with a liquid core waveguide
(see references below). Nitrite is measured separately without the Cd column
and then subtracted from the combined nitrate+nitrite sample. The molybdenum
blue method modified for use with liquid core wave guide was used for
phosphate (references below).
Recovery for phosphate measurements for LWCC relative to the MAGIC method is
100 \\u00b1 15 % for concentrations below 100 nmol/L. The relative standard
deviation for nine measurements of 5 nmol/L phosphate was 1.6 %. The relative
standard deviation for nine measurements of 60 nM phosphate was 0.9 %. LWCC
detection limit (3 x \\u03c3 of blank) for phosphate was 0.5 nmol/L, 1.5 nmol/L
for nitrate and 0.6 nmol/L for nitrite.
Upper working limit for LWCC:
Phosphate 100 nmol/L
Nitrate 200 nmol/L
Nitrite 200 nmol/L";
String awards_0_award_nid "54753";
String awards_0_award_number "OCE-0926423";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0926423";
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 "54938";
String awards_1_award_number "OCE-0926092";
String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0926092";
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
"Version: 03 May 2011
20 Feb 2013: Added event_GEOTRC and sample_GEOTRC
PI: Cutter
Nutrients - Nanomolar concentrations of PO4, NO3, NO2 (surface)
Please note that data may not be final, pending intercalibration results and
further analysis. If you are interested in following changes to US GEOTRACES
NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES
<a href=\"https://www.bco-dmo.org/project/2066\" target=\"_blank\">project page</a>.";
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 "2011-05-03T17:42:38Z";
String date_modified "2020-04-10T19:49:02Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.3470.2";
Float64 Easternmost_Easting -9.60547;
Float64 geospatial_lat_max 38.34679;
Float64 geospatial_lat_min 16.8546;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -9.60547;
Float64 geospatial_lon_min -78.9949;
String geospatial_lon_units "degrees_east";
String history
"2024-12-22T09:22:00Z (local files)
2024-12-22T09:22:00Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3470.html";
String infoUrl "https://www.bco-dmo.org/dataset/3470";
String institution "BCO-DMO";
String instruments_0_acronym "GeoFish";
String instruments_0_dataset_instrument_nid "5737";
String instruments_0_description "The GeoFish towed sampler is a custom designed near surface (";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/31/";
String instruments_0_instrument_name "GeoFish Towed near-Surface Sampler";
String instruments_0_instrument_nid "549";
String instruments_0_supplied_name "GeoFish";
String keywords "bco, bco-dmo, biological, chemical, chemistry, concentration, cruise, cruise_id, data, dataset, date, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, Earth Science > Oceans > Ocean Chemistry > Phosphate, erddap, event, event_GEOTRC, fish, flag, geo, GeoFish_id, GeoTraces_ID, geotrc, iso, latitude, longitude, management, mass, mass_concentration_of_phosphate_in_sea_water, mole, mole_concentration_of_nitrate_in_sea_water, mole_concentration_of_nitrite_in_sea_water, n02, nitrate, nitrite, no2, NO2_Flag, no3, NO3_Flag, ocean, oceanography, oceans, office, phosphate, po4, PO4_Flag, preliminary, remarks, sample, sample_GEOTRC, science, sea, seawater, time, time2, traces, water";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/3470/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/3470";
Float64 Northernmost_Northing 38.34679;
String param_mapping "{'3470': {'lat': 'master - latitude', 'lon': 'master - longitude', 'ISO_DateTime_UTC': 'master - time'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3470/parameters";
String people_0_affiliation "Old Dominion University";
String people_0_affiliation_acronym "ODU";
String people_0_person_name "Gregory Cutter";
String people_0_person_nid "50679";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Old Dominion University";
String people_1_affiliation_acronym "ODU";
String people_1_person_name "Gregory Cutter";
String people_1_person_nid "50679";
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 "Stephen R. Gegg";
String people_2_person_nid "50910";
String people_2_role "BCO-DMO Data Manager";
String people_2_role_type "related";
String project "U.S. GEOTRACES NAT";
String projects_0_acronym "U.S. GEOTRACES NAT";
String projects_0_description
"Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office.
The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the \"origin\" of the global Meridional Overturning Circulation.
It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these \"exotic\" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the \"fulldepth TEI\" stations, and constitute approximately half of the stations to be ultimately occupied.
Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version]
Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.
The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2).
KN199-04 Cruise Report (PDF)
Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010. The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version]
The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3).
KN204-01A,B Cruise Report (PDF)
Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011. [click on the image to view a larger version]
Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials
ADCP data are available from the Currents ADCP group at the University of Hawaii at the links below:KN199-04 (leg 1 of 2010 cruise; Lisbon to Cape Verde)KN199-05 (leg 2 of 2010 cruise; Cape Verde to Charleston, NC)KN204-01A (part 1 of 2011 cruise; Woods Hole, MA to Bermuda)KN204-01B (part 2 of 2011 cruise; Bermuda to Cape Verde)";
String projects_0_end_date "2013-08";
String projects_0_geolocation "Subtropical western and eastern North Atlantic Ocean";
String projects_0_name "U.S. GEOTRACES North Atlantic Transect";
String projects_0_project_nid "2066";
String projects_0_project_website "https://www.geotraces.org/";
String projects_0_start_date "2010-10";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 16.8546;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "PO4_Flag,NO3_Flag,NO2_Flag";
String summary "PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010.";
String time_coverage_end "2010-11-25T17:49:00.00Z";
String time_coverage_start "2010-10-17T17:58:00.00Z";
String title "[GT10 - Nanomolar Nutrients - Surface] - PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)";
String version "2";
Float64 Westernmost_Easting -78.9949;
String xml_source "osprey2erddap.update_xml() v1.3";
}
}
Data Access Protocol (DAP) and its
selection constraints.
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
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
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.