ERDDAP > info > ismerFreezingDegreeDay

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	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		M	background			Institut des scie...	ismerFreezingDegreeDay

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	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)
attribute	NC_GLOBAL	contributor_institution	String	(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
attribute	NC_GLOBAL	contributor_name	String	(a) Dany Dumont, (b) Sébastien Dugas, (c) Eliott Bismuth, (d) Peter Galbraith, (e) Antoine Biehler
attribute	NC_GLOBAL	contributor_role	String	(a) Metadata Custodian, Author, (b) Coauthor, Contributor, (c) Coauthor, Contributor, (d) Contributor, (e) Metadata Custodian, Contributor, Editor
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.12, ACDD-1.3, NCCSV-1.2
attribute	NC_GLOBAL	creator_email	String	dany_dumont at uqar.ca
attribute	NC_GLOBAL	creator_identifier	String	https://orcid.org/0000-0003-4107-1799
attribute	NC_GLOBAL	creator_name	String	Dany Dumont
attribute	NC_GLOBAL	creator_type	String	person
attribute	NC_GLOBAL	data_source_01	String	Environment and Climate Change Canada - HRDPS model - https://eccc-msc.github.io/open-data/msc-data/nwp_hrdps/readme_hrdps_en/
attribute	NC_GLOBAL	data_source_02	String	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
attribute	NC_GLOBAL	dataset_status	String	OnGoing
attribute	NC_GLOBAL	defaultGraphQuery	String	&time>=max(time)-1year&.bgColor=0xffffffff
attribute	NC_GLOBAL	DOI	String	A VERIFIER
attribute	NC_GLOBAL	geospatial_lat_max	String	52.2
attribute	NC_GLOBAL	geospatial_lat_min	String	45.1
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	String	-55.2
attribute	NC_GLOBAL	geospatial_lon_min	String	-71.3
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	grid_mapping_epsg_code	String	EPSG:4326
attribute	NC_GLOBAL	grid_mapping_epsg_code_url	String	https://epsg.io/4326
attribute	NC_GLOBAL	grid_mapping_geographic_crs_name	String	WGS 84
attribute	NC_GLOBAL	grid_mapping_inverse_flattening	String	298.2572236
attribute	NC_GLOBAL	grid_mapping_name	String	latitude_longitude
attribute	NC_GLOBAL	grid_mapping_prime_meridian_name	String	Greenwich
attribute	NC_GLOBAL	grid_mapping_semi_major_axis	String	6378137
attribute	NC_GLOBAL	infoUrl	String	https://ogsl.ca/cartesglacesstlaurent/
attribute	NC_GLOBAL	institution	String	Institut des sciences de la mer de Rimouski
attribute	NC_GLOBAL	keywords	String	air temperature, climate change, sea ice
attribute	NC_GLOBAL	keywords_fr	String	glace de mer, température de l'air, changement climatique
attribute	NC_GLOBAL	keywords_vocabulary	String	NASA Global Change Master Directory (GCMD) Science Keywords and homemade keywords
attribute	NC_GLOBAL	license	String	Creative Commons Attribution 4.0 International licence (CC-BY 4.0)
attribute	NC_GLOBAL	licenseUrl	String	https://creativecommons.org/licenses/by/4.0/
attribute	NC_GLOBAL	marine_region	String	Gulf of St. Lawrence
attribute	NC_GLOBAL	marine_region_identifier	String	http://marineregions.org/mrgid/4290
attribute	NC_GLOBAL	publisher_email	String	info at ogsl.ca
attribute	NC_GLOBAL	publisher_name	String	St. Lawrence Global Observatory
attribute	NC_GLOBAL	publisher_name_fr	String	Observatoire global du Saint-Laurent
attribute	NC_GLOBAL	publisherID	String	https://ror.org/03wfagk22
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	standard_name_nerc_vocabulary	String	The NERC Vocabulary Server (NVS)
attribute	NC_GLOBAL	standard_name_other_vocabulary	String	dwc: Darwin Core List of Terms (v 2023-09) dcmi: Dublin Core Metadata Initiative Metadata Terms (v 2020-01)
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v86
attribute	NC_GLOBAL	summary	String	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).
attribute	NC_GLOBAL	summary_fr	String	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.
attribute	NC_GLOBAL	time_coverage_end	String	2026-08-16
attribute	NC_GLOBAL	time_coverage_start	String	1996-11-01
attribute	NC_GLOBAL	title	String	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
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	8.468064E8, 1.7868384E9
attribute	time	axis	String	T
attribute	time	coverage_content_type	String	coordinate
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Time
attribute	time	nerc_standard_name	String	Date
attribute	time	nerc_standard_name_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/
attribute	time	standard_name	String	time
attribute	time	standard_name_identifier	String	https://vocab.nerc.ac.uk/collection/P07/current/CFSN0115/
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	time_precision	String	1970-01-01
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	air_temperature		float
attribute	air_temperature	actual_range	float	-22.27799, 20.31933
attribute	air_temperature	description	String	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
attribute	air_temperature	ioos_category	String	Temperature
attribute	air_temperature	long_name	String	Mean air temperature at 2m
attribute	air_temperature	nerc_standard_name	String	air_temperature_2m_model
attribute	air_temperature	nerc_standard_name_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ATEMP2MM/
attribute	air_temperature	standard_name	String	air_temperature
attribute	air_temperature	standard_name_identifier	String	https://vocab.nerc.ac.uk/collection/P07/current/CFSN0023/
attribute	air_temperature	units	String	degrees_C
attribute	air_temperature	units_metadata	String	temperature: on_scale
variable	air_temperature_deficit		float
attribute	air_temperature_deficit	actual_range	float	-19.68356, 9.628974
attribute	air_temperature_deficit	air_temperature_threshold	String	-1.8
attribute	air_temperature_deficit	description	String	Average daily degrees below seawater freezing temperature.
attribute	air_temperature_deficit	ioos_category	String	Temperature
attribute	air_temperature_deficit	long_name	String	Air temperature deficit
attribute	air_temperature_deficit	units	String	degrees_C
attribute	air_temperature_deficit	units_metadata	String	temperature: difference
variable	freezing_degree_days		float
attribute	freezing_degree_days	actual_range	float	-11.60802, 783.0048
attribute	freezing_degree_days	air_temperature_threshold	String	-1.8
attribute	freezing_degree_days	description	String	Sum of average daily degrees below seawater freezing temperature for 365 days from September 1st of each year.
attribute	freezing_degree_days	ioos_category	String	Temperature
attribute	freezing_degree_days	long_name	String	Freezing degree days (cumulative)
attribute	freezing_degree_days	standard_name	String	integral_wrt_time_of_air_temperature_deficit
attribute	freezing_degree_days	standard_name_identifier	String	https://vocab.nerc.ac.uk/collection/P07/current/4GRPX3GS/
attribute	freezing_degree_days	units	String	degrees_C
attribute	freezing_degree_days	units_metadata	String	temperature: difference

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.