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Dataset Title:	[XRD data and results for OAE North Atlantic experiments] - X-ray diffraction (XRD) raw data and Rietveld refinement results for precipitates from shipboard ocean alkalinity enhancement (OAE) experiments in the North Atlantic on R/V Atlantic Explorer cruise AE2320 in September 2023 (OCE-PRF: Towards Quantifying Calcium Carbonate Sediment Dissolution During Marine Diagenesis)
Institution:	BCO-DMO (Dataset ID: bcodmo_dataset_963717_v1)
Information:	Summary \| License \| Metadata \| Background \| Data Access Form \| Files

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Experiment_name {
    String long_name "Experiment_name";
    String units "unitless";
  }
  Alkalinity_addition {
    Int32 actual_range 500, 2000;
    String long_name "Alkalinity_addition";
    String units "micromoles per kilogram (umol/kg)";
  }
  Sample {
    String long_name "Sample";
    String units "unitless";
  }
  Exp_start_day {
    String long_name "Exp_start_day";
    String units "unitless";
  }
  Exp_start_time {
    String long_name "Exp_start_time";
    String units "unitless";
  }
  Filtration_start_day {
    String long_name "Filtration_start_day";
    String units "unitless";
  }
  Filtration_time {
    String long_name "Filtration_time";
    String units "unitless";
  }
  Filtration_end_day {
    String long_name "Filtration_end_day";
    String units "unitless";
  }
  Filtration_end_time {
    String long_name "Filtration_end_time";
    String units "unitless";
  }
  Duration_till_filtration_started {
    Float32 actual_range 0.25, 122.92;
    String long_name "Duration_till_filtration_started";
    String units "hours";
  }
  Duration_till_filtration_ended {
    Float32 actual_range 0.92, 125.5;
    String long_name "Duration_till_filtration_ended";
    String units "hours";
  }
  Experiment_mean_duration {
    Float32 actual_range 0.58, 124.21;
    String long_name "Experiment_mean_duration";
    String units "hours";
  }
  Filtration_duration {
    Float32 actual_range 0.23, 2.58;
    String long_name "Filtration_duration";
    String units "hours";
  }
  Aragonite {
    Float32 actual_range 35.5, 97.27;
    String long_name "Aragonite";
    String units "percent";
  }
  Calcite {
    Float32 actual_range 0.08, 1.9;
    String long_name "Calcite";
    String units "percent";
  }
  Halite {
    Float32 actual_range 2.25, 62.6;
    String long_name "Halite";
    String units "percent";
  }
  Total {
    Float32 actual_range 99.9, 100.0;
    String long_name "Total";
    String units "percent";
  }
  Aragonite_and_calcite_total {
    Float32 actual_range 37.4, 97.75;
    String long_name "Aragonite_and_calcite_total";
    String units "percent";
  }
  Normalized_aragonite {
    Float32 actual_range 94.92, 99.92;
    String long_name "Normalized_aragonite";
    String units "percent";
  }
  Normalized_calcite {
    Float32 actual_range 0.08, 2.0;
    String long_name "Normalized_calcite";
    String units "percent";
  }
  Aragonite_crystallite_size_L {
    Int32 actual_range 61, 126;
    String long_name "Aragonite_crystallite_size_l";
    String units "nanometers (nm)";
  }
  Crystallite_size_error {
    Int32 actual_range 1, 4;
    String long_name "Crystallite_size_error";
    String units "nanometers (nm)";
  }
  aragonite_strain_L {
    Float32 actual_range 0.019, 0.099;
    String long_name "Aragonite_strain_l";
    String units "percent";
  }
  strain_error {
    Float32 actual_range 1.0e-4, 0.0089;
    String long_name "Strain_error";
    String units "percent";
  }
  Aragonite_unit_cell_a {
    Float32 actual_range 4.96265, 4.96603;
    String long_name "Aragonite_unit_cell_a";
    String units "angstroms";
  }
  Aragonite_unit_cell_b {
    Float32 actual_range 7.96702, 7.97512;
    String long_name "Aragonite_unit_cell_b";
    String units "angstroms";
  }
  Aragonite_unit_cell_c {
    Float32 actual_range 5.75017, 5.75333;
    String long_name "Aragonite_unit_cell_c";
    String units "angstroms";
  }
 }
  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.963717.1";
    String history 
"2025-07-03T16:54:03Z (local files)
2025-07-03T16:54:03Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_963717_v1.das";
    String infoUrl "https://osprey.bco-dmo.org/dataset/963717";
    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 "To explore mineral formation due to alkalinity addition, we present results from shipboard experiments in which an aqueous solution of NaOH was added to unfiltered seawater collected from the surface ocean in the Sargasso Sea. Alkalinity addition ranged from 500 to 2000 micromoles per kilogram (µmol/kg) and the carbonate chemistry was monitored through time by measuring total alkalinity (TA) and dissolved inorganic carbon (DIC), which were used to calculate Ω. The amount of precipitate and its minerology were determined throughout the experiments. Mineral precipitation took place in all experiments over a timescale of hours to days. The dominant mineralogy of precipitate is aragonite with trace amounts of calcite and brucite. Aragonite crystallite size increases and its micro-strain decreases with time, consistent with Ostwald ripening. This dataset contains raw XRD data as well as XRD results (mineral abundances, crystallite size, strain, and unit cell parameters) determined via Rietveld refinement. The seawater for the experiments was collected near the Bermuda Atlantic Time Series (31.6667 N, 64.1667 W), which is also the same location where the experiments were conducted and filtered to obtain the precipitates, which were analyzed with XRD.";
    String title "[XRD data and results for OAE North Atlantic experiments] - X-ray diffraction (XRD) raw data and Rietveld refinement results for precipitates from shipboard ocean alkalinity enhancement (OAE) experiments in the North Atlantic on R/V Atlantic Explorer cruise AE2320 in September 2023 (OCE-PRF:  Towards Quantifying Calcium Carbonate Sediment Dissolution During Marine Diagenesis)";
  }
}

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)

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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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