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Dataset Title:	[TA HDPE glass bottle comparison] - Total alkalinity determined through experiments comparing usage of high-density polyethylene (HDPE) and borosilicate glass bottles for collection and storage of water samples collected on the GEOTRACES GP17-OCE cruise (R/V Roger Revelle RR2214) (US GEOTRACES GP17-OCE and GP17-ANT: Inorganic Carbon Cycling in the South Pacific and Southern Oceans by Direct Measurement)
Institution:	BCO-DMO (Dataset ID: bcodmo_dataset_957644_v1)
Range:	longitude = -152.0003 to -75.09732°E, latitude = -67.00024 to -19.99984°N, time = 2022-12-04T00:38:00Z to 2023-01-24T03:21:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  GEOTRACES_sample {
    Int32 actual_range 15907, 18755;
    String long_name "Geotraces_sample";
    String units "unitless";
  }
  Event_number {
    String long_name "Event_number";
    String units "unitless";
  }
  Date {
    String long_name "Date";
    String units "unitless";
  }
  time_unitless {
    String long_name "Time";
    String units "unitless";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.67011428e+9, 1.67453046e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Iso_datetime_utc";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  Sample_ID {
    Int32 actual_range 10301, 380215;
    String long_name "Sample_id";
    String units "unitless";
  }
  Station {
    Float32 actual_range 1.0, 38.0;
    String long_name "Station";
    String units "unitless";
  }
  Cast {
    Int32 actual_range 1, 14;
    String long_name "Cast";
    String units "unitless";
  }
  Niskin {
    Int32 actual_range 1, 35;
    String long_name "Niskin";
    String units "unitless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -67.00024, -19.99984;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -152.0003, -75.09732;
    String axis "X";
    String ioos_category "Location";
    String long_name "Long";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Pressure {
    Float32 actual_range 2.0, 5737.2;
    String long_name "Pressure";
    String units "decibars (db)";
  }
  Practical_Salinity {
    Float32 actual_range 33.4223, 36.2073;
    String long_name "Practical_salinity";
    String units "PSU";
  }
  Total_Alkalinity_glass_bottle {
    Float32 actual_range 2234.85, 2450.15;
    String long_name "Total_alkalinity_glass_bottle";
    String units "micromoles per kilogram seawater (umol/kg_sw)";
  }
  Total_Alkalinity_Flag_glass_bottle {
    Int32 actual_range 2, 6;
    String long_name "Total_alkalinity_flag_glass_bottle";
    String units "unitless";
  }
  Total_Alkalinity_HDPE_bottle {
    Float32 actual_range 2097.87, 2414.91;
    String long_name "Total_alkalinity_hdpe_bottle";
    String units "micromoles per kilogram seawater (umol/kg_sw)";
  }
  Total_Alkalinity_Flag_HDPE_bottle {
    Int32 actual_range 2, 6;
    String long_name "Total_alkalinity_flag_hdpe_bottle";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_url "https://www.bco-dmo.org/";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.26008/1912/bco-dmo.957644.1";
    Float64 Easternmost_Easting -75.09732;
    Float64 geospatial_lat_max -19.99984;
    Float64 geospatial_lat_min -67.00024;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -75.09732;
    Float64 geospatial_lon_min -152.0003;
    String geospatial_lon_units "degrees_east";
    String history 
"2025-05-12T09:29:08Z (local files)
2025-05-12T09:29:08Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_957644_v1.das";
    String infoUrl "https://osprey.bco-dmo.org/dataset/957644";
    String institution "BCO-DMO";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    Float64 Northernmost_Northing -19.99984;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -67.00024;
    String summary "Total alkalinity plays an important role in buffering seawater and determining how much anthropogenic carbon dioxide the oceans can absorb and mitigate the rise in atmospheric concentrations. Total alkalinity varies with location, depth, and time making it an important variable needed to quantify and monitor ocean acidification, and potentially for ocean alkalinity enhancement interventions. Currently, best practices are to use expensive high quality borosilicate glass bottles for collecting and storing these samples. However, unlike other carbon system variables, total alkalinity is not affected by gas exchange meaning plastic bottles may be suitable for total alkalinity sample storage. Plastic bottles are lighter, cheaper, and less prone to breakage making them easier to handle and ship. Here, we test the suitability of high-density polyethylene (HDPE) for collection and long-term storage of total alkalinity samples. Duplicate samples were collected in standard borosilicate glass bottles and HDPE bottles on GEOTRACES GP17-OCE. The samples were analyzed in the laboratory over a year later and the storage methods were compared. It was determined that HDPE is not suitable for long-term storage of total alkalinity samples as there were large changes in total alkalinity over time and precision of duplicate samples was very poor. We hypothesize that HDPE plastic is slightly porous leading to leaching of alkalinity either into or out of the bottle over time impacting the value of the sample. Use of HDPE bottles for total alkalinity samples is not recommended for long term sample storage.";
    String time_coverage_end "2023-01-24T03:21:00Z";
    String time_coverage_start "2022-12-04T00:38:00Z";
    String title "[TA HDPE glass bottle comparison] - Total alkalinity determined through experiments comparing usage of high-density polyethylene (HDPE) and borosilicate glass bottles for collection and storage of water samples collected on the GEOTRACES GP17-OCE cruise (R/V Roger Revelle RR2214) (US GEOTRACES GP17-OCE and GP17-ANT: Inorganic Carbon Cycling in the South Pacific and Southern Oceans by Direct Measurement)";
    Float64 Westernmost_Easting -152.0003;
  }
}

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.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

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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