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Dataset Title:  Particulate Thorium-234 from in situ pumps from R/V Knorr cruises KN199-04 and
KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S.
GEOTRACES NAT project)
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_3835)
Range: longitude = -69.808 to -9.663°E, latitude = 17.35 to 39.695°N, depth = 26.0 to 5485.0m, time = 2010-10-16T10:26:00.00Z to 2011-12-10T14:03:00.00Z
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Subset | Data Access Form | Files
 
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The Dataset Attribute Structure (.das) for this Dataset

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";
  }
  station_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 1, 24;
    String bcodmo_name "station";
    String description 
"GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'Station', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
    String long_name "Station GEOTRC";
    String units "unitless";
  }
  cruise_part {
    String bcodmo_name "cruise_part";
    String description 
"Part of cruise. For KN204-01:
A = 11/6/2011 to 11/18/2011 (Woods Hole to Bermuda)
B = 11/19/2011 to 12/11/2011 (Bermuda to Praia, Cabo Verde)";
    String long_name "Cruise Part";
    String units "text";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 17.35, 39.695;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "Latitude. Positive = North.";
    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 -69.808, -9.663;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "Longitude. Negative = West.";
    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";
  }
  event_GEOTRC {
    Int16 _FillValue 32767;
    Int16 actual_range 2009, 3282;
    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. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Event #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
    String long_name "Event GEOTRC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
    String units "unitless";
  }
  cast_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 2, 9;
    String bcodmo_name "cast";
    String description 
"Cast identifier, numbered consecutively within a station. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Cast', this parameter
name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
    String long_name "Cast GEOTRC";
    String units "unitless";
  }
  month_gmt {
    Byte _FillValue 127;
    Byte actual_range 10, 12;
    String bcodmo_name "month_gmt";
    String description "2-digit month of year (GMT). in the format mm (01 to 12)";
    String long_name "Month Gmt";
    String units "unitless";
  }
  day_gmt {
    String bcodmo_name "day_gmt";
    String description "2-digit day of month (GMT). in the format dd (01 to 31)";
    String long_name "Day Gmt";
    String units "unitless";
  }
  year {
    Int16 _FillValue 32767;
    Int16 actual_range 2010, 2011;
    String bcodmo_name "year";
    String description "4-digit year. in the format YYYY";
    String long_name "Year";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/";
    String units "unitless";
  }
  time_gmt {
    String bcodmo_name "time_gmt";
    String description "Time (GMT); 24-hour clock. in the format HHMM";
    String long_name "Time Gmt";
    String units "unitless";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.28722476e+9, 1.32352578e+9;
    String axis "T";
    String bcodmo_name "ISO_DateTime_UTC";
    String description "Cast date/time (UTC) formatted to ISO8601 standard. T indicates start of time string; Z indicates UTC. Calculated from 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";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue NaN;
    Float64 actual_range 26.0, 5485.0;
    String axis "Z";
    String bcodmo_name "depth";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Actual sample depth; provided in original data submission.";
    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";
  }
  depth_n {
    Int16 _FillValue 32767;
    Int16 actual_range 26, 5480;
    String bcodmo_name "depth_n";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Nominal sample depth.";
    String long_name "Depth";
    String standard_name "depth";
    String units "meters";
  }
  depth_GEOTRC_CTD {
    Float32 _FillValue NaN;
    Float32 actual_range 748.5, 4889.6;
    String bcodmo_name "depth";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Observation/sample depth in meters, calculated from CTD pressure. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
    String long_name "Depth";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
    String standard_name "depth";
    String units "meters";
  }
  sample_GEOTRC {
    Int16 _FillValue 32767;
    Int16 actual_range 5033, 8148;
    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. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Geotraces #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
    String long_name "Sample GEOTRC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
    String units "unitless";
  }
  sample_bottle_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 1, 8;
    String bcodmo_name "bot_Nis";
    String description "Unique identification numbers given to samples taken from bottles; ranges from 1 to 24; often used synonymously with bottle number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
    String long_name "Sample Bottle GEOTRC";
    String units "unitless";
  }
  bottle_GEOTRC {
    String bcodmo_name "bottle";
    String description "Alphanumeric characters identifying bottle type (e.g., NIS representing Niskin and GF representing GOFLO) and position on a CTD rosette. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
    String long_name "Bottle GEOTRC";
    String units "unitless";
  }
  pump {
    Byte _FillValue 127;
    Byte actual_range 1, 9;
    String bcodmo_name "unknown";
    String description "Pump number.";
    String long_name "Pump";
    String units "unitless";
  }
  Th234_p_1to51 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0154, 1.1519;
    String bcodmo_name "Th234 particulate activity";
    String description "Particulate Thorium-234 from QMA filters. Particle size of 1 to 51 um. Data were decay corrected back to mid-pump times.";
    String long_name "Th234 P 1to51";
    String units "dpm/Liter";
  }
  Th234_p_1to51_unc {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0018, 0.0432;
    String bcodmo_name "unknown";
    String description "Th234_p_1to51 uncertainty.";
    String long_name "Th234 P 1to51 Unc";
    String units "dpm/Liter";
  }
  Th234_p_gt51 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0013, 0.0881;
    String bcodmo_name "Th234 particulate activity";
    String description "Particulate Thorium-234 from mesh screens, filtered onto silver filters. Particle size greater than 51 um. Data were decay corrected back to mid-pump times.";
    String long_name "TH234 P GT51";
    String units "dpm/Liter";
  }
  Th234_p_gt51_unc {
    Float32 _FillValue NaN;
    Float32 actual_range 1.0e-4, 0.0013;
    String bcodmo_name "unknown";
    String description "Th234_p_gt51 uncertainty.";
    String long_name "Th234 P Gt51 Unc";
    String units "dpm/Liter";
  }
  q_flag {
    Byte _FillValue 127;
    Byte actual_range 1, 1;
    String bcodmo_name "q_flag";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description 
"Quality flag:
1 = Good
2 = Questionable
3 = Bad";
    String long_name "Q Flag";
    String units "unitless";
  }
  BTL_ISO_DateTime_UTC {
    String bcodmo_name "ISO_DateTime_UTC";
    String description 
"Date and time (UTC) variable recorded at the bottle sampling time in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description).
This standard is based on ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)";
    String long_name "BTL ISO Date Time UTC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
    String acquisition_description 
"Particulate material was collected using in situ McLane pumps (also see data
from Charette and Lam groups). All data were decay corrected back to the mid-
pump times.
 
1-51 um Th-234  
 On KN199-4, the mesh screens were cut in half and the material from one half
was rinsed onto a silver filter and dried down. On KN 204-01a and KN 204-01b,
the whole mesh screen was rinsed onto a silver filter and dried down. The mean
volume pumped through the whole Supor mesh screens was 475 L.
 
>51 um Th-234  
 Whole QMAs, located below a mesh screen in the filter head housing, were
oven-dried upon recovery. A 25 mm subsample was taken from this whole filter
for beta counting for Th-234. The mean effective volume for the 25 mm QMA
subsample was 47 L.";
    String awards_0_award_nid "55131";
    String awards_0_award_number "OCE-0925158";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=0925158&HistoricalAwards=false";
    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 
"Particulate Th-234 from in situ pumps:  
  large size fraction (> 51 um) and small size fraction (1-51 um) 
 PI: Ken Buesseler (WHOI) 
 Version: 31 Dec 2012 
  
 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 "2013-01-03T20:02:28Z";
    String date_modified "2020-03-30T19:20:19Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.26008/1912/bco-dmo.3835.1";
    Float64 Easternmost_Easting -9.663;
    Float64 geospatial_lat_max 39.695;
    Float64 geospatial_lat_min 17.35;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -9.663;
    Float64 geospatial_lon_min -69.808;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 5485.0;
    Float64 geospatial_vertical_min 26.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2022-08-20T05:51:43Z (local files)
2022-08-20T05:51:43Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_3835.das";
    String infoUrl "https://www.bco-dmo.org/dataset/3835";
    String institution "BCO-DMO";
    String instruments_0_acronym "McLane Pump";
    String instruments_0_dataset_instrument_description "Particulate material was collected using in situ McLane pumps.";
    String instruments_0_dataset_instrument_nid "5979";
    String instruments_0_description "McLane pumps sample large volumes of seawater at depth. They are attached to a wire and lowered to different depths in the ocean. As the water is pumped through the filter, particles suspended in the ocean are collected on the filters. The pumps are then retrieved and the contents of the filters are analyzed in a lab.";
    String instruments_0_instrument_name "McLane Pump";
    String instruments_0_instrument_nid "627";
    String instruments_0_supplied_name "McLane Pump";
    String keywords "1to51, bco, bco-dmo, biological, bottle, bottle_GEOTRC, btl, BTL_ISO_DateTime_UTC, cast, cast_GEOTRC, chemical, cruise, cruise_id, cruise_part, data, dataset, date, day, day_gmt, depth, depth_GEOTRC_CTD, depth_n, dmo, erddap, event, event_GEOTRC, flag, geotrc, gt51, iso, latitude, longitude, management, month, month_gmt, oceanography, office, part, preliminary, pump, q_flag, sample, sample_bottle_GEOTRC, sample_GEOTRC, station, station_GEOTRC, th234, Th234_p_1to51, Th234_p_1to51_unc, Th234_p_gt51, Th234_p_gt51_unc, time, time_gmt, unc, year";
    String license "https://www.bco-dmo.org/dataset/3835/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/3835";
    Float64 Northernmost_Northing 39.695;
    String param_mapping "{'3835': {'lat': 'flag - latitude', 'depth': 'flag - depth', 'lon': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3835/parameters";
    String people_0_affiliation "Woods Hole Oceanographic Institution";
    String people_0_affiliation_acronym "WHOI";
    String people_0_person_name "Kenneth O. Buesseler";
    String people_0_person_nid "50522";
    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";
    String people_1_person_name "Stephanie Owens";
    String people_1_person_nid "51616";
    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 "Shannon Rauch";
    String people_2_person_nid "51498";
    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 "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)";
    Float64 Southernmost_Northing 17.35;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "q_flag";
    String summary "Particulate Th-234 from in situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from the 2010 and 2011 U.S. GEOTRACES cruises.";
    String time_coverage_end "2011-12-10T14:03:00.00Z";
    String time_coverage_start "2010-10-16T10:26:00.00Z";
    String title "Particulate Thorium-234 from in situ pumps from R/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)";
    String version "1";
    Float64 Westernmost_Easting -69.808;
    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
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.


 
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