Data Access Form

Dataset Title:	MSTraceGases
Institution:	University of Helsinki (Dataset ID: 618d5c26-a1f1-4754-a502-8bf27850f76b)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
time (Timestamp (ISO), UTC)	2024-05-04T00:00:00Z	2025-06-29T23:00:00Z

SA (Sulfuric Acid (SA), cm-3)	3955.353555	8257434.94851
MSA (cm-3)	2324.747834	9356413.615909
IA (Iodic Acid (IA), cm-3)	2401.212843	9452109.521523
station_id	"mstracegases"	"mstracegases"
latitude (degrees_north)	78.92	78.92

longitude (degrees_east)	11.9	11.9

Server-side Functions

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.7147808e+9, 1.751238e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Timestamp (ISO)";
    String source_name "Timestamp (ISO)";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  SA {
    Float64 _FillValue NaN;
    Float64 actual_range 3955.353555, 8257434.94851;
    String long_name "Sulfuric Acid (SA)";
    String standard_name "air_pressure_at_freezing_level";
    String units "cm-3";
  }
  MSA {
    Float64 _FillValue NaN;
    Float64 actual_range 2324.747834, 9356413.615909;
    String long_name "Methane Sulfonic Acid (MSA)";
    String units "cm-3";
  }
  IA {
    Float64 _FillValue NaN;
    Float64 actual_range 2401.212843, 9452109.521523;
    String long_name "Iodic Acid (IA)";
    String units "cm-3";
  }
  station_id {
    String actual_range 
"mstracegases
mstracegases";
    String cf_role "timeseries_id";
    String long_name "Id of the station in the TimeSeries";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 78.92, 78.92;
    String axis "Y";
    String ioos_category "Location";
    String long_name "latitude position of the station";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 11.9, 11.9;
    String axis "X";
    String ioos_category "Location";
    String long_name "longitude position of the station";
    String standard_name "longitude";
    String units "degrees_east";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id,latitude,longitude";
    String contributor_email "lauriane.quelever@helsinki.fi";
    String contributor_institution "University of Helsinki";
    String contributor_name "Lauriane L. J. Quéléver";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_email "lauriane.quelever@helsinki.fi";
    String creator_name "Lauriane Quéléver";
    String creator_type "institution";
    Float64 Easternmost_Easting 11.9;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 78.92;
    Float64 geospatial_lat_min 78.92;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 11.9;
    Float64 geospatial_lon_min 11.9;
    String geospatial_lon_units "degrees_east";
    String history 
"The published data are extracted from mass spectrometer raw data, further preprocessed ( averaged to 60 min , mass-calibrated ), normalized to the reagent ion multimers (Nitrates) and, scaled to the calibration coefficient (determined for Sulfuric Acid)
2026-02-14T00:28:26Z (local files)
2026-02-14T00:28:26Z https://data.iadc.cnr.it/erddap/tabledap/618d5c26-a1f1-4754-a502-8bf27850f76b.html";
    String infoUrl "https://www.helsinki.fi/en/inar";
    String institution "University of Helsinki";
    String keywords "Iodic Acid, Mass Spectrometer, Methane Sulfonic Acid, Ny-\\u00c5lesund, Sulfuric Acid, Svalbard, Trace Gases";
    String license "CC BY-NC: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator.";
    Float64 Northernmost_Northing 78.92;
    String publisher_name "Italian Arctic Data Center";
    String publisher_type "group";
    String publisher_url "https://iadc.cnr.it";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 78.92;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Concentration data for Sulfuric Acid (SA), Methane Sulfonic Acid (MSA) and Iodic Acid (IA) - in molecule per cubic centimeter (#.cm-3). Averaging time 60 min.";
    String time_coverage_end "2025-06-29T23:00:00Z";
    String time_coverage_start "2024-05-04T00:00:00Z";
    String title "MSTraceGases";
    Float64 Westernmost_Easting 11.9;
  }
}

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.