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Dataset Title:	[TA HDPE bottle storage test] - Total alkalinity from an experiment testing the suitability of high-density polyethylene (HDPE) for collection and long- term storage of total alkalinity samples using laboratory-manipulated oligotrophic Atlantic surface water (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_957694_v1)
Information:	Summary \| License \| 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 {
  Bottle_ID {
    String long_name "Bottle_id";
    String units "unitless";
  }
  Soak_solution {
    String long_name "Soak_solution";
    String units "unitless";
  }
  Soak_Duration {
    Int32 actual_range 0, 2;
    String long_name "Soak_duration";
    String units "weeks";
  }
  Bottle_Number {
    Int32 actual_range 1, 23;
    String long_name "Bottle_number";
    String units "unitless";
  }
  Analysis_Date_Time_EST {
    String long_name "Analysis_date_time_est";
    String units "unitless";
  }
  Total_Alkalinity {
    Float32 actual_range 2213.75, 2358.58;
    String long_name "Total_alkalinity";
    String units "micromoles per kilogram seawater (umol/kg_sw)";
  }
  Analysis_Flag {
    Int32 actual_range 2, 5;
    String long_name "Analysis_flag";
    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 doi "10.26008/1912/bco-dmo.957694.1";
    String history 
"2025-05-12T09:29:08Z (local files)
2025-05-12T09:29:08Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_957694_v1.das";
    String infoUrl "https://osprey.bco-dmo.org/dataset/957694";
    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.";
    String sourceUrl "(local files)";
    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 through laboratory experiments where HDPE bottles were treated to different cleaning methods and then filled with surface seawater and stored for 15-17 months before analyzing for total alkalinity. 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 title "[TA HDPE bottle storage test] - Total alkalinity from an experiment testing the suitability of high-density polyethylene (HDPE) for collection and long-term storage of total alkalinity samples using laboratory-manipulated oligotrophic Atlantic surface water (US GEOTRACES GP17-OCE and GP17-ANT: Inorganic Carbon Cycling in the South Pacific and Southern Oceans by Direct Measurement)";
  }
}

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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