ERDDAP
Easier access to data
Easier access to data
| Dataset Title: | Analysis of Air Temperatures Related to Sea Ice Formation in the Estuary and Gulf of St. Lawrence | Analyse des températures de l'air liée à la formation de la glace de mer dans l'estuaire et le golfe du Saint-Laurent 
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| Institution: | Institut des sciences de la mer de Rimouski (Dataset ID: ismerFreezingDegreeDay) |
| Information: | Summary
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Attributes {
s {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 8.468064e+8, 1.7868384e+9;
String axis "T";
String coverage_content_type "coordinate";
String ioos_category "Time";
String long_name "Time";
String nerc_standard_name "Date";
String nerc_standard_name_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String standard_name "time";
String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0115/";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01";
String units "seconds since 1970-01-01T00:00:00Z";
}
air_temperature {
Float32 actual_range -22.27799, 20.31933;
String description "The provided air temperature value is an average of the temperature (computed at 2m above the surface by the HRDPS model - https://eccc-msc.github.io/open-data/msc-data/nwp_hrdps/readme_hrdps_en/) over the water surface included in the area defined by the coordinates: 46.6 to 52.2°N ; -71.3 to -55.8°E";
String ioos_category "Temperature";
String long_name "Mean air temperature at 2m";
String nerc_standard_name "air_temperature_2m_model";
String nerc_standard_name_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ATEMP2MM/";
String standard_name "air_temperature";
String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0023/";
String units "degrees_C";
String units_metadata "temperature: on_scale";
}
air_temperature_deficit {
Float32 actual_range -19.68356, 9.628974;
String air_temperature_threshold "-1.8";
String description "Average daily degrees below seawater freezing temperature.";
String ioos_category "Temperature";
String long_name "Air temperature deficit";
String units "degrees_C";
String units_metadata "temperature: difference";
}
freezing_degree_days {
Float32 actual_range -11.60802, 783.0048;
String air_temperature_threshold "-1.8";
String description "Sum of average daily degrees below seawater freezing temperature for 365 days from September 1st of each year.";
String ioos_category "Temperature";
String long_name "Freezing degree days (cumulative)";
String standard_name "integral_wrt_time_of_air_temperature_deficit";
String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/4GRPX3GS/";
String units "degrees_C";
String units_metadata "temperature: difference";
}
}
NC_GLOBAL {
String cdm_data_type "Other";
String comment
"Data from 2024-9-01 to 2025-01-22 are transiently not from the HRDPS model but from the Copernicus ERA5 model. HRDPS data will replace ERA5 data when historical HRDPS data become available.
Data prior to September 1, 2024 are temporarily calculated over a different period from November 1 to September 1 of each year. These data will soon be updated with the new period (i.e. September 1 to August 31)";
String contributor_institution "(a) Université du Québec à Rimouski, (b) Université du Québec à Rimouski, (c) Service Hydrographique et Océanographique de la Marine, (d) Fisheries and Oceans Canada, (e) St. Lawrence Global Observatory";
String contributor_name "(a) Dany Dumont, (b) Sébastien Dugas, (c) Eliott Bismuth, (d) Peter Galbraith, (e) Antoine Biehler";
String contributor_role "(a) Metadata Custodian, Author, (b) Coauthor, Contributor, (c) Coauthor, Contributor, (d) Contributor, (e) Metadata Custodian, Contributor, Editor";
String Conventions "COARDS, CF-1.12, ACDD-1.3, NCCSV-1.2";
String creator_email "dany_dumont@uqar.ca";
String creator_identifier "https://orcid.org/0000-0003-4107-1799";
String creator_name "Dany Dumont";
String creator_type "person";
String data_source_01 "Environment and Climate Change Canada - HRDPS model - https://eccc-msc.github.io/open-data/msc-data/nwp_hrdps/readme_hrdps_en/";
String data_source_02 "From 2024-09-01 to 2025-01-22 only Copernicus Climate Change Service, Climate Data Store, (2023) - ERA5 hourly data on single levels from 1940 to present - https://doi.org/10.24381/cds.adbb2d47";
String dataset_status "OnGoing";
String defaultGraphQuery "&time>=max(time)-1year&.bgColor=0xffffffff";
String DOI "A VERIFIER";
String geospatial_lat_max "52.2";
String geospatial_lat_min "45.1";
String geospatial_lat_units "degrees_north";
String geospatial_lon_max "-55.2";
String geospatial_lon_min "-71.3";
String geospatial_lon_units "degrees_east";
String grid_mapping_epsg_code "EPSG:4326";
String grid_mapping_epsg_code_url "https://epsg.io/4326";
String grid_mapping_geographic_crs_name "WGS 84";
String grid_mapping_inverse_flattening "298.2572236";
String grid_mapping_name "latitude_longitude";
String grid_mapping_prime_meridian_name "Greenwich";
String grid_mapping_semi_major_axis "6378137";
String history
"2026-08-18T00:42:46Z (local files)
2026-08-18T00:42:46Z http://erddap.cioos.ca/erddap/tabledap/ismerFreezingDegreeDay.html";
String infoUrl "https://ogsl.ca/cartesglacesstlaurent/";
String institution "Institut des sciences de la mer de Rimouski";
String keywords "air temperature, climate change, sea ice";
String keywords_fr "glace de mer, température de l'air, changement climatique";
String keywords_vocabulary "NASA Global Change Master Directory (GCMD) Science Keywords and homemade keywords";
String license "Creative Commons Attribution 4.0 International licence (CC-BY 4.0)";
String licenseUrl "https://creativecommons.org/licenses/by/4.0/";
String marine_region "Gulf of St. Lawrence";
String marine_region_identifier "http://marineregions.org/mrgid/4290";
String publisher_email "info@ogsl.ca";
String publisher_name "St. Lawrence Global Observatory";
String publisher_name_fr "Observatoire global du Saint-Laurent";
String publisherID "https://ror.org/03wfagk22";
String sourceUrl "(local files)";
String standard_name_nerc_vocabulary "The NERC Vocabulary Server (NVS)";
String standard_name_other_vocabulary
"dwc: Darwin Core List of Terms (v 2023-09)
dcmi: Dublin Core Metadata Initiative Metadata Terms (v 2020-01)";
String standard_name_vocabulary "CF Standard Name Table v86";
String summary "This dataset contains values calculated using existing data produced by Environment and Climate Change Canada (ECCC). Freezing degree-days (FDD) correspond to the negative difference between the average daily temperature and the freezing point of seawater (Tf = -1.8°C). For example, if for one day the average temperature is -21.8°C, it raises the annual FDD value by 20.0 FDD. When the daily averaged temperature is above Tf, the FDD value is negative. FDDs are summed starting on September 1st each year. When the cumulative number of FDDs (CFDD) becomes negative, it is reset to zero. The start of winter corresponds to the first time the CFDD is and remains above 0. In this data set, the daily temperature averaged over the entire marine domain of the Gulf of St. Lawrence is used. The data comes from surface temperature forecasts (T2m) from ECCC's High Resolution Deterministic Prediction System (HRDPS).";
String summary_fr "Ce jeu de données contient des valeurs calculées à partir de données existantes produites par Environnement et changement climatique Canada (ECCC). Un degré-jour de gel (DJG) correspond à la différence négative entre la température moyenne journalière et le point de congélation de l'eau de mer (Tf = -1.8°C). Si pour un jour la température moyenne est de -21.8°C, par exemple, il élève la valeur DJG annuelle de 20.0 DJG. Les jours où la température moyenne est supérieure Tf, la valeur de DJG diminue. Les DJG sont calculés à partir du 1er septembre. Lorsque le nombre cumulé de DJG (DJGC) devient négatif, il est remis à zéro. Le début de l’hiver correspond au moment où les DJG commencent à augmenter de manière persistante, donc au premier moment où DJGC est plus grand que 0. Dans ce jeu de données, on utilise la température journalière moyennée sur l'ensemble du domaine marin du golfe du Saint-Laurent. Les données sont issues des prévisions de température de surface (T2m) du système de prévision déterministe à haute résolution (HRDPS) d'ECCC.";
String time_coverage_end "2026-08-16";
String time_coverage_start "1996-11-01";
String title "Analysis of Air Temperatures Related to Sea Ice Formation in the Estuary and Gulf of St. Lawrence | Analyse des températures de l'air liée à la formation de la glace de mer dans l'estuaire et le golfe du Saint-Laurent";
}
}
Data Access Protocol (DAP) and its
selection constraints.
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.