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Dataset Title:  Particulate organic carbon (POC) and nitrogen (PON) along US GEOTRACES North
Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N.
Atlantic from 2010 (U.S. GEOTRACES NAT project)
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_3851)
Range: longitude = -24.4962 to -9.6604°E, latitude = 17.3581 to 38.3296°N, depth = 0.0 to 0.0m, time = 2010-10-18T10:11:00Z to (now?)
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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 "dimensionless";
  }
  station_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 1, 12;
    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 "dimensionless";
  }
  cast_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 1, 5;
    String bcodmo_name "cast";
    String description "Cast identifier numbered consecutively within a station.  Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
    String long_name "Cast GEOTRC";
    String units "dimensionless";
  }
  event_GEOTRC {
    Int16 _FillValue 32767;
    Int16 actual_range 2042, 2220;
    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";
  }
  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 "dimensionless";
  }
  sample_bottle_GEOTRC {
    Byte _FillValue 127;
    Byte actual_range 13, 13;
    String bcodmo_name "sample";
    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 nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
    String units "dimensionless";
  }
  sample_GEOTRC {
    Int16 _FillValue 32767;
    Int16 actual_range 5160, 6033;
    String bcodmo_name "station";
    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 'sample_no'; this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.
Unique sample identifier, where sample numbers from station 1 were collected with WHOI's GEOTRACES pump and samples for stations > 1 were collected with NASA's surface peristaltic pump. Samples with a GEOTRACES sample number also had pigment samples collected, missing sample numbers (nd) did not.";
    String long_name "Sample GEOTRC";
    String units "dimensionless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 17.3581, 38.3296;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "Latitude component of geographic position where samples were collected.";
    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 -24.4962, -9.6604;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "Longitude component of geographic position where samples were collected.";
    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";
  }
  time_gmt {
    Int16 _FillValue 32767;
    Int16 actual_range 1120, 1710;
    String bcodmo_name "time_gmt";
    String description "Time of sampling, reported in GMT. in the format hhmm";
    String long_name "Time Gmt";
    String units "unitless";
  }
  yrday_gmt {
    Int16 _FillValue 32767;
    Int16 actual_range 290, 306;
    String bcodmo_name "yrday_gmt";
    String description "Year day recorded in GMT time, where Jan 1 is day 1.";
    String long_name "Yrday Gmt";
    String units "unitless";
  }
  date_gmt {
    Int32 _FillValue 2147483647;
    Int32 actual_range 20101017, 20101102;
    String bcodmo_name "date_gmt";
    String description "Date, recorded in GMT time. in the format yyyymmdd";
    String long_name "Date Gmt";
    String units "unitless";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue NaN;
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String bcodmo_name "depth";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Sample depth in meters.";
    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";
  }
  POC {
    Float32 _FillValue NaN;
    Float32 actual_range 31.6, 91.3;
    String bcodmo_name "POC";
    String description "Particulate organic carbon";
    String long_name "Particulate Organic Carbon";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CORGCAP1/";
    String units "milligrams/m^3";
  }
  POC_sd {
    Float32 _FillValue NaN;
    Float32 actual_range 0.2, 18.5;
    String bcodmo_name "particulates_sd";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String description "Standard deviation of POC measurements.";
    String long_name "POC Sd";
    String units "milligrams/m^3";
  }
  PON {
    Float32 _FillValue NaN;
    Float32 actual_range 2.8, 11.8;
    String bcodmo_name "PON";
    String description "Particulate organic nitrogen.";
    String long_name "PON";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/MDMAP013/";
    String units "milligrams/m^3";
  }
  PON_sd {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 5.0;
    String bcodmo_name "particulates_sd";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String description "Standard deviation of PON measurements.";
    String long_name "PON Sd";
    String units "milligrams/m^3";
  }
  replicate {
    Byte _FillValue 127;
    Byte actual_range 2, 2;
    String bcodmo_name "replicate";
    String description "A number indicating how many replicate samples were averaged to produce the reported value.";
    String long_name "Replicate";
    String units "dimensionless";
  }
  depth_GEOTRC_CTD {
    Float32 _FillValue NaN;
    Float32 actual_range 5.0, 5.2;
    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";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.28739666e+9, NaN;
    String axis "T";
    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)
format: YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]";
    String ioos_category "Time";
    String long_name "BTL ISO Date Time UTC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    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 
"Sampling Excerpt from associated file: Determination of Carbon and Nitrogen
collected on Whatman glass fiber filters (GFF)
 
Water samples are filtered through 2.5 cm pre-combusted Whatman GFF filters
using an all-glass filtering funnel. Once enough material has been accumulated
on the filter the samples are stored in Nalgene 1.8 mL cryovials at -80\\u00b0C
until analysis. For shipping, samples are stored in liquid nitrogen dry-
shippers. Prior to analysis samples are thawed and dried overnight at
65\\u00b0C inside the uncapped cryovials. Dry samples in the uncapped vials are
transferred overnight to a desiccator saturated with HCl fumes to remove
particulate inorganic carbon present in the sample. The air in the desiccator
is kept saturated by leaving concentrated HCl in an open container in the
lower compartment of the desiccator. Acid\\u2013treated samples are transferred
back to a 65\\u00b0C oven overnight, after which can be stored capped in
cryovials for extended periods prior to analysis in elemental analyzer.
 
For analysis the samples are wrapped in tin foil discs (PE N241-1363) and
pelletized on a Parr Pellet press.
 
The samples are analyzed in the Perkin Elmer CHNS/O Analyzer 2400 Series II.
The manufacturer\\u2019s data management software for the elemental analyzer is
set up so that the analysis report includes the zero read (ZR), and the carbon
and nitrogen signals (CS, NS) from the instrument for each analyzed sample.
 
For complete analysis and processing details, see the Supplemental Document:
Determination of Carbon and Nitrogen collected on Whatman glass fiber filters
(GFF)\\u00a0(POC_Pkn_Elmer_2400.pdf).";
    String awards_0_award_nid "55148";
    String awards_0_award_number "NNX09AN94G";
    String awards_0_funder_name "National Aeronautics & Space Administration";
    String awards_0_funding_acronym "NASA";
    String awards_0_funding_source_nid "353";
    String cdm_data_type "Other";
    String comment 
"Particulate Organic Carbon and Nitrogen data from the GT10 cruise KN199-04 
 PIs:  Joaquin Chaves and Charles McClain (both NASA) 
 Version: 20130109 
 Samples from station 1 were collected with WHOI's GEOTRACES pump. 
 Samples from station numbers > 1 were collected with NASA's  
 	surface peristaltic pump.";
    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 dataset_current_state "Final and no updates";
    String date_created "2013-01-10T17:24:48Z";
    String date_modified "2020-05-01T17:23:53Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.26008/1912/bco-dmo.3851.1";
    Float64 Easternmost_Easting -9.6604;
    Float64 geospatial_lat_max 38.3296;
    Float64 geospatial_lat_min 17.3581;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -9.6604;
    Float64 geospatial_lon_min -24.4962;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2022-09-25T09:16:02Z (local files)
2022-09-25T09:16:02Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_3851.das";
    String infoUrl "https://www.bco-dmo.org/dataset/3851";
    String institution "BCO-DMO";
    String instruments_0_acronym "Pump surface";
    String instruments_0_dataset_instrument_description "NASA's surface peristaltic pump was used to collect some samples.";
    String instruments_0_dataset_instrument_nid "6023";
    String instruments_0_description "A source of uncontaminated near-surface seawater pumped onto the deck of the research vessel that can be sampled and analyzed. This pumped seawater supply is from an over-the-side pumping system, and is therefore different from the vessel underway seawater system.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/31/";
    String instruments_0_instrument_name "Pump surface";
    String instruments_0_instrument_nid "619";
    String instruments_0_supplied_name "Pump surface";
    String instruments_1_acronym "CHN_EA";
    String instruments_1_dataset_instrument_description 
"Perkin Elmer CHNS/O Analyzer 2400 Series II:
The PE 2400 is a commercially available elemental analyzer that uses a combustion method to convert the sample elements to simple gases (CO2, H2O, and N2). The sample is first oxidized in a pure oxygen environment. Elements such as halogens and sulfur are removed by scrubbing reagents in the combustion zone. The resulting gases are homogenized and controlled to exact conditions of pressure, temperature, and volume. The homogenized gases are allowed to de-pressurize trough a column where they are separated in a stepwise, steady-state manner and measured as a function of their thermal conductivities.";
    String instruments_1_dataset_instrument_nid "6024";
    String instruments_1_description "A CHN Elemental Analyzer is used for the determination of carbon, hydrogen, and  nitrogen content in organic and other types of materials, including  solids, liquids, volatile, and viscous samples.";
    String instruments_1_instrument_name "CHN Elemental Analyzer";
    String instruments_1_instrument_nid "625";
    String instruments_1_supplied_name "CHN Elemental Analyzer";
    String keywords "bco, bco-dmo, biological, bottle, bottle_GEOTRC, btl, BTL_ISO_DateTime_UTC, carbon, cast, cast_GEOTRC, chemical, cruise, cruise_id, data, dataset, date, date_gmt, depth, depth_GEOTRC_CTD, dmo, erddap, event, event_GEOTRC, geotrc, iso, latitude, longitude, management, oceanography, office, organic, particulate, poc, POC_sd, pon, PON_sd, preliminary, replicate, sample, sample_bottle_GEOTRC, sample_GEOTRC, station, station_GEOTRC, time, time_gmt, yrday, yrday_gmt";
    String license "https://www.bco-dmo.org/dataset/3851/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/3851";
    Float64 Northernmost_Northing 38.3296;
    String param_mapping "{'3851': {'lat': 'flag - latitude', 'depth': 'flag - depth', 'BTL_ISO_DateTime_UTC': 'flag - time', 'lon': 'flag - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3851/parameters";
    String people_0_affiliation "National Aeronautics and Space Administration";
    String people_0_affiliation_acronym "NASA";
    String people_0_person_name "Joaquin Chaves";
    String people_0_person_nid "51637";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "National Aeronautics and Space Administration";
    String people_1_affiliation_acronym "NASA";
    String people_1_person_name "Charles McClain";
    String people_1_person_nid "50549";
    String people_1_role "Co-Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "Woods Hole Oceanographic Institution";
    String people_2_affiliation_acronym "WHOI BCO-DMO";
    String people_2_person_name "Danie Kinkade";
    String people_2_person_nid "51549";
    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 17.3581;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "cruise_id,depth,replicate";
    String summary "Particulate organic carbon (POC) and nitrogen (PON) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic from 2010.";
    String time_coverage_start "2010-10-18T10:11:00Z";
    String title "Particulate organic carbon (POC) and nitrogen (PON) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic from 2010 (U.S. GEOTRACES NAT project)";
    String version "1";
    Float64 Westernmost_Easting -24.4962;
    String xml_source "osprey2erddap.update_xml() v1.5";
  }
}

 

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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