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Dataset Title:	OCEAN:ICE - Trace gas measurements, basal glacial meltwater fractions, and water ages during RV POLARSTERN cruise PS124, Southern Weddell Sea
Institution:	PANGAEA (Dataset ID: Weddell_Sea_water_mass_age_meltwater_fractions)
Range:	longitude = -36.5863 to -25.7143°E, latitude = -77.1077 to -70.4177°N
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Event {
    String ioos_category "Unknown";
    String long_name "Event Label";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -77.1077, -70.4177;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -36.5863, -25.7143;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Elevation {
    Float64 _FillValue 32767.0;
    Float64 actual_range -4487.0, -324.0;
    String ioos_category "Unknown";
    String long_name "Elevation of event";
    String units "m";
  }
  Station {
    Int16 _FillValue 127;
    Int16 actual_range 5, 98;
    String ioos_category "Unknown";
    String long_name "Station Label";
  }
  Cast {
    Int16 _FillValue 127;
    Int16 actual_range 1, 5;
    String ioos_category "Unknown";
    String long_name "Cast Number";
  }
  Bottle {
    Int16 _FillValue 127;
    Int16 actual_range 1, 24;
    String ioos_category "Unknown";
    String long_name "Bottle Number";
  }
  Press {
    Float64 actual_range 10.16, 3195.11;
    String ioos_category "Pressure";
    String long_name "Water Pressure";
    String units "dbar";
  }
  Tpot {
    Float64 actual_range -2.0173, 0.8126;
    String ioos_category "Other";
    String long_name "Seat water potential temperature";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
  Sal {
    Float64 actual_range 33.6545, 34.714;
    String ioos_category "Salinity";
    String long_name "Salinity";
    Float64 missing_value NaN;
    String standard_name "sea_water_practical_salinity";
  }
  He {
    Float64 actual_range -9.0, 2.7737;
    String ioos_category "Other";
    String long_name "Helium";
    String units "nmol/kg";
  }
  QF_He {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Helium Quality Flag";
  }
  He_exc {
    Float64 actual_range -9.0, 54.6981;
    String ioos_category "Other";
    String long_name "Helium, excess above solubility equilibrium";
    String units "%";
  }
  QF_He_exc {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Helium excess Quality Flag";
  }
  He_d_3 {
    Float64 actual_range -9.0, 9.1584;
    String ioos_category "Other";
    String long_name "δ Helium-3";
    String units "%";
  }
  QF_He_d_3 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "δ Helium-3 Quality Flag";
  }
  Neon {
    Float64 actual_range -9.0, 11.456;
    String ioos_category "Other";
    String long_name "Neon";
    String units "nmol/kg";
  }
  QF_Ne {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Neon Quality Flag";
  }
  Ne_exc {
    Float64 actual_range -9.0, 42.1647;
    String ioos_category "Other";
    String long_name "Neon";
    String units "%";
  }
  QF_Ne_exc {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Neon excess Quality Flag";
  }
  d_HeNe {
    Float64 actual_range -9.0, 8.8161;
    String ioos_category "Other";
    String long_name "Deviation from equilibrium He/Ne ratio";
    String units "%";
  }
  QF_d_HeNe {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Deviation from equilibrium He/Ne ratio Quality Flag";
  }
  Glacial_w_He {
    Float64 actual_range -9.0, 4.0;
    String ioos_category "Other";
    String long_name "Glacial meltwater derivated from He";
    String units "%";
  }
  QF_Glacial_w_He {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Glacial meltwater from Helium Quality Flag";
  }
  Glacial_w_Ne {
    Float64 actual_range -9.0, 4.12;
    String ioos_category "Other";
    String long_name "Glacial meltwater derivated from Ne";
    String units "%";
  }
  QF_Glacial_w_Ne {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Glacial meltwater from Ne Quality Flag";
  }
  Glacial_w_NeHe {
    Float64 actual_range -9.0, 4.0;
    String ioos_category "Other";
    String long_name "Glacial meltwater derivated from smaller";
    String units "%";
  }
  QF_Glacial_w_NeHe {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Glacial meltwater from smaller Quality Flag";
  }
  CFC12 {
    Float64 actual_range -9.0, 2.8803;
    String ioos_category "Other";
    String long_name "Freon-12 (dichlorodifluoromethane)";
    String units "pmol/kg";
  }
  QF_CFC12 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Freon-12 (dichlorodifluoromethane) Quality Flag";
  }
  pCFC12 {
    Float64 actual_range -9.0, 422.4621;
    String ioos_category "Other";
    String long_name "Freon-12 (dichlorodifluoromethane)";
    String units "pptv";
  }
  QF_pCFC12 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Freon-12 (dichlorodifluoromethane) Quality Flag";
  }
  SF6 {
    Float64 actual_range -16.6612, 93.9931;
    String ioos_category "Other";
    String long_name "Sulfur hexafluoride, SF6";
    String units "fmol/kg";
  }
  QF_SF6 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Sulfur hexafluoride, SF6, Quality Flag";
  }
  pSF6 {
    Float64 actual_range -9.0, 226.1439;
    String ioos_category "Other";
    String long_name "Sulfur hexafluoride, SF6";
    String units "pptv";
  }
  QF_pSF6 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Sulfur hexafluoride, SF6, Quality Flag";
  }
  Age_SF6 {
    Float64 actual_range -9.0, 43.6;
    String ioos_category "Other";
    String long_name "SF6 Age";
  }
  QF_Age_SF6 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "SF6 Age Quality Flag";
  }
  Age_CFC12_SF6 {
    Float64 actual_range -9.0, 35.6;
    String ioos_category "Other";
    String long_name "CFC-12/SF6 Age";
  }
  QF_Age_CFC12_SF6 {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "CFC-12/SF6 Age Quality Flag";
  }
  TTD_mean_age {
    Float64 actual_range -9.0, 288.0;
    String ioos_category "Other";
    String long_name "Transient time distribution mean age";
  }
  QF_TTD_mean_age {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 2, 9;
    String ioos_category "Unknown";
    String long_name "Transient time distribution mean age Quality Flag";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String citation "Janout, M., Huhn, O., Sültenfuß, J., Bulsiewicz, K., & Hinse, Y. (2024). Record of water mass age and meltwater fractions, Weddell Sea (D1.12). Zenodo. https://doi.org/10.5281/zenodo.12581210";
    String contributors_name "Huhn Oliver, Sültenfuß Jürgen, Bulsiewicz Klaus, Hinse Yannick";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_name "Oliver Huhn";
    String creator_type "Person";
    String creator_url "https://www.awi.de/";
    String data_creation "03-06-2024";
    String data_doi "https://zenodo.org/records/11096232";
    Float64 Easternmost_Easting -25.7143;
    Float64 geospatial_lat_max -70.4177;
    Float64 geospatial_lat_min -77.1077;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -25.7143;
    Float64 geospatial_lon_min -36.5863;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-11-06T09:23:32Z (local files)
2024-11-06T09:23:32Z https://er1.s4oceanice.eu/tabledap/Weddell_Sea_water_mass_age_meltwater_fractions.das";
    String infoUrl "https://issues.pangaea.de/browse/PDI-38252";
    String institution "PANGAEA";
    String keywords "data, local, source";
    String keywords_vocabulary "GCMD Earth Science Keywords";
    String license "CC-BY4.0";
    String metadata_url "https://zenodo.org/records/11096232";
    String naming_authority "OCEAN:ICE";
    Float64 Northernmost_Northing -70.4177;
    String references "https://zenodo.org/records/11096232";
    String source "CTD/water bottle";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -77.1077;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "This datset presents trace gas measurements and derived variables such as basal glacial meltwater (GMW) fractions and water mass ages from the RV POLARSTERN expedition PS124 in the southern Weddell Sea in austral summer 2021. The trace gases comprise the lighter noble gases, i.e., total helium (He) and the excess above solubility equilibrium ΔHe, the 3He/4He ratio reported as δ3He, total neon (Ne) and the excess ΔNe, and the deviation from the equilibrium He/Ne ratio Δ(He/Ne), as well as the transient anthropogenic trace gases chlorofluorocarbon (CFC-12) and sulphur hexafluoride (SF6) concentrations. From these noble gases (He and Ne) we derived glacial meltwater fractions. From the transient tracers we computed SF6-concentration ages, CFC-12/SF6 ratio ages and TTD (Transit Time Distribution) mean ages.";
    String title "OCEAN:ICE - Trace gas measurements, basal glacial meltwater fractions, and water ages during RV POLARSTERN cruise PS124, Southern Weddell Sea";
    String variables "Station number, Cast number, Bottle Number, Pressure, Potential temperature, Salinity, Latitude, Longitude, Helium total, He, Flag He, Helium excess above solubility equilibrium, Flag He excess, Helium isotope ration 3He/4He, Flag δ3He, Neon total, Ne, Flag Ne, Neon excess above solubility equilibrium, ΔNe [%], Flag Ne, deviation from equilibrium He/Ne ratio,  Flag Δ(He/Ne), Glacial meltwater derived from He [%], Flag He, Glacial meltwater derived from Ne, Flag Ne, Glacial meltwater derived from He or Ne, whichever is smaller, Flag He / Ne, CFC-12, Flag CFC-12, pCFC-12, Flag CFC-12, SF6, Flag SF6, pSF6, Flag SF6, SF6 concentration age, Flag SF6, CFC-12/SF6 ratio age, Flag CFC-12 / SF6, CFC-12 and SF6 based TTD mean age, Flag CFC-12 / SF6";
    Float64 Westernmost_Easting -36.5863;
  }
}

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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