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Dataset Title:  SPI - Trace gas mixing ratios measured over the Southern Ocean in the austral
summer of 2016/2017, during the Antarctic Circumnavigation Expedition.
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Institution:  Paul Scherrer Institute, Villigen, Switzerland   (Dataset ID: SPI_10_5281_zenodo_2636778)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Variable ?   Optional
Constraint #1 ?
Optional
Constraint #2 ?
   Minimum ?
 
   Maximum ?
 
 time (UTC) ?          2016-12-17T00:00:00Z    2017-04-10T23:55:00Z
  < slider >
 latitude (degrees_north) ?          -74.00771    53.97401
  < slider >
 longitude (degrees_east) ?          -179.99343    179.99936
  < slider >
 o3_concentration (ppb) ?          -1.355    44.175
 ch4_concentration (ppm) ?          1.778    1.97
 co_concentration (ppb) ?          0.002    0.18
 co2_concentration (ppm) ?          395.592    419.977
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.4819328e+9, 1.4918685e+9;
    String axis "T";
    String description "time";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
    String x_spi_emodnet_visualise_variable "False";
  }
  latitude {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Lat";
    Float64 actual_range -74.00771, 53.97401;
    String attribute "Average latitude of the ship on which the measurements took place, during the five-minute time interval";
    String axis "Y";
    String description "Average latitude of the ship on which the measurements took place, during the five-minute time interval [decimal degrees North]";
    String ioos_category "Location";
    String long_name "Latitude";
    String spi_original_name "latitude [degN]";
    String standard_name "latitude";
    String units "degrees_north";
    String x_spi_emodnet_visualise_variable "False";
  }
  longitude {
    Int32 _ChunkSizes 512;
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.99343, 179.99936;
    String attribute "Average longitude of the ship on which the measurements took place, during the five-minute time interval";
    String axis "X";
    String description "Average longitude of the ship on which the measurements took place, during the five-minute time interval [decimal degrees East]";
    String ioos_category "Location";
    String long_name "Longitude";
    String spi_original_name "longitude [degE]";
    String standard_name "longitude";
    String units "degrees_east";
    String x_spi_emodnet_visualise_variable "False";
  }
  o3_concentration {
    Int32 _ChunkSizes 512;
    Float64 actual_range -1.355, 44.175;
    String description "Concentration of ozone (O3) measured in parts per billion during the five-minute interval [ppb]";
    String spi_original_name "O3 [ppb]";
    String units "ppb";
    String x_spi_emodnet_visualise_variable "True";
  }
  ch4_concentration {
    Int32 _ChunkSizes 512;
    Float64 actual_range 1.778, 1.97;
    String description "Concentration of methane (CH4) measured in parts per million during the five-minute interval [ppm]";
    String spi_original_name "CH4 [ppm]";
    String units "ppm";
    String x_spi_emodnet_visualise_variable "True";
  }
  co_concentration {
    Int32 _ChunkSizes 512;
    Float64 actual_range 0.002, 0.18;
    String description "Concentration of carbon monoxide (CO) measured in parts per billion during the five-minute interval [ppb]";
    String spi_original_name "CO [ppb]";
    String units "ppb";
    String x_spi_emodnet_visualise_variable "True";
  }
  co2_concentration {
    Int32 _ChunkSizes 512;
    Float64 actual_range 395.592, 419.977;
    String description "Concentration of carbon dioxide (CO2) measured in parts per million during the five-minute interval [ppm]";
    String spi_original_name "CO2 [ppm]";
    String units "ppm";
    String x_spi_emodnet_visualise_variable "True";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String citation "Schmale, J., Henning, S., Tummon, F., Hartmann, M., Baccarini, A., Welti, A., Lehtipalo, K., Tatzelt, C. and Gysel-Beer, M. (2020). Trace gas mixing ratios measured over the Southern Ocean in the austral summer of 2016/2017, during the Antarctic Circumnavigation Expedition. (Version 1.1) [Data set]. Zenodo. http://doi.org/10.5281/zenodo.4028749";
    String contributors "[{'title': 'Julia Schmale', 'path': 'https://orcid.org/0000-0002-1048-7962', 'email': 'julia.schmale@epfl.ch', 'role': 'author', 'organisation': 'Paul Scherrer Institute, Villigen, Switzerland', 'x_spi_additional_organisation': 'EPFL, Lausanne, Switzerland'}, {'title': 'Silvia Henning', 'path': 'https://orcid.org/0000-0001-9267-7825', 'role': 'author', 'organisation': 'Leibniz Institute for Tropospheric Research, Leipzig, Germany'}, {'title': 'Fiona Tummon', 'path': 'https://orcid.org/0000-0001-9700-1701', 'role': 'author', 'organisation': 'Eidgenössische Technische Hochschule Zürich; MeteoSwiss, Payerne, Switzerland'}, {'title': 'Markus Hartmann', 'path': 'https://orcid.org/0000-0001-9700-1701', 'role': 'author', 'organisation': 'Leibniz Institute for Tropospheric Research, Leipzig, Germany'}, {'title': 'Andrea Baccarini', 'path': 'https://orcid.org/0000-0003-4614-247X', 'role': 'author', 'organisation': 'Paul Scherrer Institute, Villigen, Switzerland'}, {'title': 'Katrianne Lehtipalo', 'path': 'https://orcid.org/0000-0002-1660-2706', 'role': 'author', 'organisation': 'University of Helsinki, Finland'}, {'title': 'Christian Tatzelt', 'path': 'https://orcid.org/0000-0001-7795-5372', 'role': 'author', 'organisation': 'Leibniz Institute for Tropospheric Research, Leipzig, Germany'}, {'title': 'Martin Gysel-Beer', 'path': 'https://orcid.org/0000-0002-7453-1264', 'role': 'author', 'organisation': 'Paul Scherrer Institute, Villigen, Switzerland'}, {'title': 'Jen Thomas', 'path': 'https://orcid.org/0000-0002-5986-7026', 'role': 'publisher', 'organisation': 'Swiss Polar Institute, Switzerland'}]";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "Julia Schmale";
    String creator_type "institution";
    String creator_url "https://orcid.org/0000-0002-1048-7962";
    String DOI "https://doi.org/10.5281/zenodo.4028749";
    Float64 Easternmost_Easting 179.99936;
    Float64 geospatial_lat_max 53.97401;
    Float64 geospatial_lat_min -74.00771;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99936;
    Float64 geospatial_lon_min -179.99343;
    String geospatial_lon_units "degrees_east";
    String history 
"2020-10-31T16:28:27Z (local files)
2020-10-31T16:28:27Z https://erddap.emodnet-physics.eu/erddap/tabledap/SPI_10_5281_zenodo_2636778.html";
    String infoUrl "https://doi.org/10.5281/zenodo.4028749";
    String institution "Paul Scherrer Institute, Villigen, Switzerland";
    String keywords "ACE, ACE-SPACE, Antarctic Circumnavigation Expedition, Antarctica, carbon dioxide, carbon monoxide, CO, CO2, CO4, methane, O3, ozone, Southern Ocean, trace gas";
    String license "CC-BY-4.0";
    Float64 Northernmost_Northing 53.97401;
    String platform_code "UBXH3_ace_2636778";
    String platform_name "R/V Akademik Tryoshnikov";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -74.00771;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "The authors would highly appreciate to be contacted if the data is used for any purpose. We measured mixing ratios of CO, CO2 and CH4 with a PICARRO G2401 Gas Analyzer. Ozone (O3) mixing ratios were measured with a 2B Technology ozone monitor, model 205. We report five-minute averaged data cleaned from exhaust gas influence. Temporal coverage is from December 20, 2016 to April 10, 2017. The trace gas concentrations represent a large number of atmospheric processes that happen on different time scales. CO for example, has basically no sources other than combustion and can hence be used as tracer for air mass transport from regions with combustion activities (e.g., South Africa). CO has a lifetime of a few weeks. CO2 and CH4 are longer-lived trace gases which disperse globally. The data set shows that concentrations in the Northern Hemisphere are higher than in the Southern Hemisphere. Both trace gases are emitted by anthropogenic activities as well as natural sources. Over the cruise track, areas of the Southern Ocean were passed where these trace gases either outgas or are absorbed. Ozone is a secondary trace gas, meaning that it is formed in the atmosphere. Its concentrations are relatively low. All trace gases data have been cleaned from exhaust gas influence.";
    String time_coverage_end "2017-04-10T23:55:00Z";
    String time_coverage_start "2016-12-17T00:00:00Z";
    String title "SPI - Trace gas mixing ratios measured over the Southern Ocean in the austral summer of 2016/2017, during the Antarctic Circumnavigation Expedition.";
    String type "ferrybox/ship";
    Float64 Westernmost_Easting -179.99343;
  }
}

 

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.

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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