Accessing BCO-DMO data
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BCO-DMO ERDDAP
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| Dataset Title: | [GT10 - As AP Surface Transects] - Surface arsenic, antimony speciation, and alkaline phosphatase activity along with 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_3520) |
| Range: | longitude = -79.8822 to -16.0467°E, latitude = 16.921 to 35.16°N |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Data Access Form
| Files
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Zoom: ![[The graph you specified. Please be patient.]](https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3520.png?longitude,latitude,date&.draw=markers&.marker=5%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff)
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "cruise id";
String long_name "Cruise Id";
String units "text";
}
transect_station {
String bcodmo_name "transect_station";
String description "station identifier within transect";
String long_name "Transect Station";
String units "text";
}
date {
Int32 _FillValue 2147483647;
Int32 actual_range 20101020, 20101126;
String bcodmo_name "date";
String description "Date 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";
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 16.921, 35.16;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "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 -79.8822, -16.0467;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "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";
}
AsIII {
Float32 _FillValue NaN;
Float32 actual_range 0.08, 7.6;
String bcodmo_name "unknown";
String description "Arsenite (HAsO32-)";
String long_name "As III";
String units "nmol/L";
}
TAs {
Float32 _FillValue NaN;
Float32 actual_range 3.2, 35.5;
String bcodmo_name "unknown";
String description "Total inorganic arsenic (AsIII+V)";
String long_name "TAs";
String units "nmol/L";
}
As {
Float32 _FillValue NaN;
Float32 actual_range 1.94, 35.2;
String bcodmo_name "arsenic";
String description "As(V)";
String long_name "As";
String units "nanomoles/liter";
}
MMAs {
Float32 _FillValue NaN;
Float32 actual_range 0.01, 0.46;
String bcodmo_name "unknown";
String description "Monomethyl arsenic";
String long_name "MMAs";
String units "nmol/L";
}
DMAs {
Float32 _FillValue NaN;
Float32 actual_range 0.03, 4.71;
String bcodmo_name "unknown";
String description "Dimethyl arsenic";
String long_name "DMAs";
String units "nmol/L";
}
AP_Turnover_Time {
Float32 _FillValue NaN;
Float32 actual_range 0.29, 6.15;
String bcodmo_name "unknown";
String description "Alkaline phosphatase turnover time";
String long_name "AP Turnover Time";
String units "hours";
}
AP_Turnover_Rate {
Float32 _FillValue NaN;
Float32 actual_range 0.0022, 0.1376;
String bcodmo_name "unknown";
String description "Alkaline phosphatase turnover rate";
String long_name "AP Turnover Rate";
String units "h-1";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
String acquisition_description
"Filtered (0.4 \\u00b5m) water samples from the Geotraces surface tow-fish taken
at discrete times into 500 mL Teflon FEP bottles, refrigerated, and analyzed
within 24 hours of collection. Arsenic and antimony speciation determined
using selective hydride generation, liquid nitrogen-cooled trapping, and then
revolatilization and determination with gas chromatography/photoionization
detection (Cutter et al., 1991; Cutter and Cutter, 2006). Calibration
performed daily via the standard additions method, with a minimum of 4
additions of AsIII, AsV, MMAs, or DMAs depending on the analyses. The slope
from the linear fit to these data was then applied to all samples for that
day. Detection limits were 25 pmol/L for As(III) and As(III+V), and 50 pmol/L
for MMAs and DMAs. Precision was better than 8% (relative standard deviation)
for all As species. Alkaline phosphatase enzyme activity was measured using
the fluorescence method of Ammerman (1993).";
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: 3 January 2013
PI: Cutter
KN199-04/05 Surface transects
for arsenic speciation, antimony speciation, and alkaline phosphatase activity
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 "2011-08-08T17:18:28Z";
String date_modified "2020-04-10T19:16:20Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.3520.2";
Float64 Easternmost_Easting -16.0467;
Float64 geospatial_lat_max 35.16;
Float64 geospatial_lat_min 16.921;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -16.0467;
Float64 geospatial_lon_min -79.8822;
String geospatial_lon_units "degrees_east";
String history
"2024-11-08T06:04:04Z (local files)
2024-11-08T06:04:04Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_3520.das";
String infoUrl "https://www.bco-dmo.org/dataset/3520";
String institution "BCO-DMO";
String instruments_0_acronym "GeoFish";
String instruments_0_dataset_instrument_description
"Surface seawater samples were collected from ~2-5 meters depth outside of ship's influence using the UCSC designed \"GeoFish\" towed sampling system.
All surface samples were filtered and then homogenized in one or two of the 500 L SAFe tanks
GeoFish/SAFe tank system consists of PFA TeflonTM tubing, an all PFA TeflonTM diaphragm pump, sequential filtration through 0.45 µm then 0.2 µm pore size polycarbonate, track etched (PCTE) pleated filter cartridges and two 500 L fluorinated low density polyethylene tanks connected with all TeflonTM tubing, valves and fittings. All filtrations, acidifications and bottling of the SAFe and GEOTRACES samples were performed inside of Class-100 clean benches in a portable clean van.";
String instruments_0_dataset_instrument_nid "5724";
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 "UCSC designed \"GeoFish\" towed sampling system";
String instruments_1_acronym "TUV";
String instruments_1_dataset_instrument_nid "6017";
String instruments_1_description "A towed undulating vehicle is a generic class of instruments. See the data set specific information for a detailed description. These are often prototype instrument packages designed to make very specific measurements.";
String instruments_1_instrument_name "towed undulating vehicle";
String instruments_1_instrument_nid "604";
String instruments_1_supplied_name "towed undulating vehicle";
String instruments_2_acronym "Gas Chromatograph";
String instruments_2_dataset_instrument_description "(tbd)";
String instruments_2_dataset_instrument_nid "5725";
String instruments_2_description "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)";
String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB02/";
String instruments_2_instrument_name "Gas Chromatograph";
String instruments_2_instrument_nid "661";
String instruments_2_supplied_name "Gas Chromatograph";
String keywords "AP_Turnover_Rate, AP_Turnover_Time, AsIII, bco, bco-dmo, biological, chemical, cruise, cruise_id, data, dataset, date, dmas, dmo, erddap, iii, latitude, longitude, management, mmas, oceanography, office, preliminary, rate, station, tas, time, time2, transect, transect_station, turnover";
String license "https://www.bco-dmo.org/dataset/3520/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/3520";
Float64 Northernmost_Northing 35.16;
String param_mapping "{'3520': {'lat': 'master - latitude', 'lon': 'master - longitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3520/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 "Oliver Wurl";
String people_1_person_nid "51337";
String people_1_role "Contact";
String people_1_role_type "related";
String people_2_affiliation "Leibniz Institute for Baltic Sea Research Warnemunde Germany";
String people_2_person_name "Oliver Wurl";
String people_2_person_nid "51337";
String people_2_role "Contact";
String people_2_role_type "related";
String people_3_affiliation "Woods Hole Oceanographic Institution";
String people_3_affiliation_acronym "WHOI BCO-DMO";
String people_3_person_name "Stephen R. Gegg";
String people_3_person_nid "50910";
String people_3_role "BCO-DMO Data Manager";
String people_3_role_type "related";
String people_4_affiliation "Woods Hole Oceanographic Institution";
String people_4_affiliation_acronym "WHOI BCO-DMO";
String people_4_person_name "Theresa McKee";
String people_4_person_nid "51103";
String people_4_role "BCO-DMO Data Manager";
String people_4_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 16.921;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Data for the concentrations of the dissolved (<0.4 \\u00b5m) arsenic species: total inorganic As (III+V), arsenite (AsIII), arsenate (AsV), monomethyl As, and dimethyl As; and the activity of the enzyme alkaline phosphatase (unfiltered) on the surface transect.";
String title "[GT10 - As AP Surface Transects] - Surface arsenic, antimony speciation, and alkaline phosphatase activity along with 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 -79.8822;
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.