{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 15:54:15.443012", "data_source": "ERA5", "website": "http://wexa.jamstec.go.jp", "Author": "Patrick Martineau"}, "event_id": {"name": "Event ID", "description": "A unique identifier based on: beginning_date, end_date, longitude, and latitude", "value": "2020-Jan-01_to_2020-Jan-03_323.0_67.5"}, "event_label": {"name": "Event label", "description": "Integer-valued grid identifier that uniquely labels each detected extreme event in space and time, consistent with the corresponding labels stored in the NetCDF dataset.", "value": 2020010000089}, "status": {"name": "Status", "description": "An ongoing event denotes an event that lasts up to the latest data available. These events are subject to change as newer data is added.", "value": false}, "start_date": {"name": "Start date", "description": "First date on which grid points are under the influence of an event", "value": "January 01 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 03 2020"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "figures_available": {"name": "Figures available", "description": "True if figures were pre-generated for this event", "value": true}, "detection_var": {"name": "Detection variable", "description": "Variable used for the detection scheme", "value": "t2m"}, "event_type": {"name": "Event type", "description": "Type of the event detected", "value": "Cold spell"}, "area": {"name": "Area", "description": "The area (in square meters) encompassing all grid points under the influence of an event during its lifetime.", "value": 100023.8404311431}, "countries_affected": {"name": "Countries affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the countries affected by an event during its lifetime.", "value": ["Greenland"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America"]}, "oceans_affected": {"name": "Ocean basins affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the ocean basins affected by an event during its lifetime.", "value": []}, "center_lat": {"name": "Center latitude", "description": "Latitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 67.5}, "center_lon": {"name": "Center longitude", "description": "Longitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 323.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "323.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 318.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 326.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 67.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 72.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-42.03, 69.53], [-41.5, 69.75], [-41.25, 69.65], [-41.18, 69.68], [-41.03, 70.03], [-40.68, 70.18], [-40.53, 70.53], [-40.0, 70.75], [-39.75, 70.65], [-39.68, 70.68], [-39.65, 70.75], [-39.75, 71.0], [-39.65, 71.25], [-39.75, 71.5], [-39.53, 72.03], [-39.0, 72.25], [-38.75, 72.15], [-38.68, 72.18], [-38.53, 72.53], [-38.0, 72.75], [-37.75, 72.65], [-37.5, 72.75], [-37.25, 72.65], [-37.0, 72.75], [-36.47, 72.53], [-36.32, 72.18], [-35.97, 72.03], [-35.75, 71.5], [-35.85, 71.25], [-35.82, 71.18], [-35.75, 71.15], [-35.5, 71.25], [-34.97, 71.03], [-34.82, 70.68], [-34.47, 70.53], [-34.32, 70.18], [-34.25, 70.15], [-34.0, 70.25], [-33.47, 70.03], [-33.25, 69.5], [-33.47, 68.97], [-33.82, 68.82], [-33.85, 68.75], [-33.75, 68.5], [-33.97, 67.97], [-34.5, 67.75], [-34.75, 67.85], [-34.82, 67.82], [-34.97, 67.47], [-35.32, 67.32], [-35.47, 66.97], [-36.0, 66.75], [-36.25, 66.85], [-36.5, 66.75], [-36.75, 66.85], [-37.0, 66.75], [-37.25, 66.85], [-37.5, 66.75], [-37.75, 66.85], [-37.82, 66.82], [-37.97, 66.47], [-38.5, 66.25], [-39.03, 66.47], [-39.25, 67.0], [-39.15, 67.25], [-39.18, 67.32], [-39.25, 67.35], [-39.5, 67.25], [-39.75, 67.35], [-40.0, 67.25], [-40.25, 67.35], [-40.5, 67.25], [-41.03, 67.47], [-41.18, 67.82], [-41.53, 67.97], [-41.68, 68.32], [-42.03, 68.47], [-42.25, 69.0], [-42.03, 69.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Greenland/Iceland"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-01-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-42.02999999999997, 68.47], [-42.25, 69.0], [-42.02999999999997, 69.53], [-41.5, 69.75], [-41.25, 69.65], [-41.18000000000001, 69.68], [-41.02999999999997, 70.03], [-40.68000000000001, 70.18], [-40.52999999999997, 70.53], [-40.0, 70.75], [-39.75, 70.65], [-39.68000000000001, 70.68], [-39.64999999999998, 70.75], [-39.75, 71.0], [-39.64999999999998, 71.25], [-39.75, 71.5], [-39.52999999999997, 72.03], [-39.0, 72.25], [-38.75, 72.15], [-38.68000000000001, 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67.47], [-41.18000000000001, 67.82], [-41.52999999999997, 67.97], [-41.68000000000001, 68.32], [-42.02999999999997, 68.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -15.461905114871257}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -10.936021160815748}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-40.82091084905545, -43.44265105352926, -40.464053852169314]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-46.34081470268168, -48.8070771756243, -45.99643258041854]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.97570094828748, -12.849216947079407, -9.983145587080362]}, "anom_evo_maxamp": {"name": "Evolution 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