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Dataset Title:  SAFe and GEOTRACES trace element references from R/V Knorr KN199-04, KN204-01
in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_3852)
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 identification";
    String long_name "Cruise Id";
    String units "text";
  sta {
    Byte _FillValue 127;
    Byte actual_range 7, 20;
    String bcodmo_name "sta";
    String description "station number";
    String long_name "Sta";
    String units "integer";
  element {
    String bcodmo_name "unknown";
    String description "chemical trace element measured";
    String long_name "Element";
    String units "text";
  unit {
    String bcodmo_name "unknown";
    String description "concentration units measured for each element";
    String long_name "Unit";
    String units "picomoles/kilogram or nanomoles/kilogram";
  blank {
    Float32 _FillValue NaN;
    Float32 actual_range 0.01, 1.57;
    String bcodmo_name "unknown";
    String description "concentration measured for each element in the blank";
    String long_name "Blank";
    String units "picomoles/kilogram or nanomoles/kilogram";
  lod {
    Float32 _FillValue NaN;
    Float32 actual_range 0.01, 1.19;
    String bcodmo_name "unknown";
    String description "limit of detection equivalent to 3 times the standard deviation of the blanks or samples at or near blank level.";
    String long_name "Lod";
    String units "picomoles/kilogram or nanomoles/kilogram";
  ref_SAFe_deep {
    Float32 _FillValue NaN;
    Float32 actual_range 0.35, 1002.11;
    String bcodmo_name "trace_metal_conc";
    String description "concentration measured for each element from water collected at 1000 meters at the SAFe site (Pacific O.)";
    String long_name "Ref SAFe Deep";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "picomoles/kilogram or nanomoles/kilogram";
  ref_SAFe_surf {
    Float32 _FillValue NaN;
    Float32 actual_range 0.07, 62.19;
    String bcodmo_name "trace_metal_conc";
    String description "concentration measured for each element from water collected at the surface at the SAFe site (Pacific O.)";
    String long_name "Ref SAFe Surf";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "picomoles/kilogram or nanomoles/kilogram";
  ref_GT_deep {
    Float32 _FillValue NaN;
    Float32 actual_range 0.19, 272.15;
    String bcodmo_name "trace_metal_conc";
    String description "concentration measured for each element from water collected at 2000 meters at the GEOTRACES site (Atlantic O.)";
    String long_name "Ref GT Deep";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "picomoles/kilogram or nanomoles/kilogram";
  ref_GT_surf {
    Float32 _FillValue NaN;
    Float32 actual_range 0.04, 129.88;
    String bcodmo_name "trace_metal_conc";
    String description "concentration measured for each element from water collected at the surface GEOTRACES site (Atlantic O.)";
    String long_name "Ref GT Surf";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "picomoles/kilogram or nanomoles/kilogram";
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"SAFe reference samples:  
 During the SAFe (Sampling and Analysis of Fe) program and the North Atlantic
and North Pacific GEOTRACES Intercalibration cruises, we (Geoffrey Smith and
Ken Bruland) collected large volumes of homogenized surface and deep seawater
to provide 0.5 L SAFe reference samples to researchers investigating the
marine chemistry of trace metals in both the U.S. and international trace
metal communities. Surface seawater was collected using the UCSC designed
\\\"GeoFish\\\" towed sampling system, filtered as described below and then
homogenized in two 500 L SAFe tanks. Water from 1000 m was collected with
multiple four-bottle casts using our Teflon coated, 30 L, GOFlo samplers
deployed on Kevlar hydroline (Bruland et al. 1979), filtered and then
homogenized in one of the SAFe tanks. Our GeoFish/SAFe tank system consists of
PFA Teflon tubing, an all PFA Teflon diaphragm pump, sequential filtration
through 0.45 \\u00b5m then 0.2 \\u00b5m pore size polycarbonate, track etched
(PCTE) pleated filter cartridges and two 500 L fluorinated low density
polyethylene tanks connected with all Teflon tubing, valves and fittings. All
filtrations, acidifications and bottling of the SAFe samples were performed
inside of Class-100 clean benches in a portable clean van. We successfully
collected and continue to provide to an international trace metal community
650 SAFe S reference samples of surface water, 650 SAFe D1 reference samples
of 1000 meter depth water, and 650 SAFe D2 reference samples of 1000 meter
depth water. These samples have been stored in rigorously acid cleaned LDPE
bottles for over four years and have proven stable for dissolved Fe and other
trace metals. These SAFe reference samples are now proving to be valuable for
a suite of GEOTRACES key and non-key trace metals.
 GEOTRACES reference samples:  
 A variety of GEOTRACES reference samples are also available. We used the
SAFe tank system on the North Atlantic GEOTRACES Intercalibration cruise to
collect an additional set of North Atlantic GEOTRACES reference samples from
the surface and from a depth of 2000 meters. The surface reference sample (GS)
was collected with the GeoFish sampling system in the same manner as for SAFe
S samples, while the 2000 m deep reference sample (GD) was collected with 5
separate casts of the GEOTRACES rosette to rinse and fill a tank.
During the Pacific GEOTRACES Intercalibration cruise, we used the GeoFish/SAFe
tank system to collect additional Pacific surface water from the SAFe site to
be used as GEOTRACES surface Pacific (GSP) reference samples (~300 0.5 L
bottles). Additionally, we collected a surface tank from the highly productive
surface waters of the Santa Barbara Basin coastal site on the Pacific
Intercalibration cruise and aliquoted ~600 0.5 L samples of this water as a
SAFe/GEOTRACES coastal surface reference sample, \\\"SGC\\\".";
    String awards_0_award_nid "55135";
    String awards_0_award_number "OCE-0961579";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0961579";
    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 cdm_data_type "Other";
    String comment 
"version: 11 Jan 2012 
  PI: K. Bruland (UCSC) 
  Reference trace element concentrations from deep 
       and surface GEOTRACES NAZT cruises 
       NOTE: Co and Cu were UV-treated";
    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 "2013-01-11T16:27:08Z";
    String date_modified "2020-03-27T16:40:31Z";
    String defaultDataQuery "&time<now";
    String doi "10.26008/1912/bco-dmo.3852.1";
    String history 
"2020-12-03T10:15:38Z (local files)
2020-12-03T10:15:38Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_3852.das";
    String infoUrl "https://www.bco-dmo.org/dataset/3852";
    String institution "BCO-DMO";
    String instruments_0_acronym "GO-FLO Teflon TM";
    String instruments_0_dataset_instrument_description "Teflon coated,30 L, GOFlo samplers were deployed on Kevlar hydroline (Bruland et al. 1979),";
    String instruments_0_dataset_instrument_nid "6027";
    String instruments_0_description "GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
    String instruments_0_instrument_name "GO-FLO Teflon Trace Metal Bottle";
    String instruments_0_instrument_nid "533";
    String instruments_0_supplied_name "GO-FLO Teflon Trace Metal";
    String instruments_1_acronym "GeoFish";
    String instruments_1_dataset_instrument_nid "6044";
    String instruments_1_description "The GeoFish towed sampler is a custom designed near surface (";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/31/";
    String instruments_1_instrument_name "GeoFish Towed near-Surface Sampler";
    String instruments_1_instrument_nid "549";
    String instruments_1_supplied_name "GeoFish";
    String instruments_2_acronym "Mass Spec";
    String instruments_2_dataset_instrument_nid "6026";
    String instruments_2_description "General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.";
    String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
    String instruments_2_instrument_name "Mass Spectrometer";
    String instruments_2_instrument_nid "685";
    String instruments_2_supplied_name "Mass Spectrometer";
    String keywords "bco, bco-dmo, biological, blank, chemical, cruise, cruise_id, data, dataset, deep, dmo, element, erddap, lod, management, oceanography, office, preliminary, ref, ref_GT_deep, ref_GT_surf, ref_SAFe_deep, ref_SAFe_surf, safe, sta, surf, unit";
    String license "https://www.bco-dmo.org/dataset/3852/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/3852";
    String param_mapping "{'3852': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3852/parameters";
    String people_0_affiliation "University of California-Santa Cruz";
    String people_0_affiliation_acronym "UC Santa Cruz";
    String people_0_person_name "Kenneth W. Bruland";
    String people_0_person_nid "50662";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Woods Hole Oceanographic Institution";
    String people_1_affiliation_acronym "WHOI BCO-DMO";
    String people_1_person_name "Nancy Copley";
    String people_1_person_nid "50396";
    String people_1_role "BCO-DMO Data Manager";
    String people_1_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 "http://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)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "SAFe and GEOTRACES trace element references from R/V Knorr cruises KN199-04 & KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011.";
    String title "SAFe and GEOTRACES trace element references from R/V Knorr KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)";
    String version "1";
    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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