{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:11.898541", "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": "2021-Dec-17_to_2021-Dec-20_10.0_7.5"}, "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": 2021120000672}, "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": "December 17 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 20 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 61200.75842654509}, "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": ["Nigeria"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa"]}, "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": 7.5}, "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": 10.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "10.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 7.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 10.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 6.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 10.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[10.03, 5.97], [9.5, 5.75], [9.25, 5.85], [9.0, 5.75], [8.47, 5.97], [8.32, 6.32], [7.97, 6.47], [7.82, 6.82], [7.75, 6.85], [7.5, 6.75], [6.97, 6.97], [6.75, 7.5], [6.85, 7.75], [6.75, 8.0], [6.96, 8.5], [6.75, 9.0], [6.97, 9.53], [7.32, 9.68], [7.35, 9.75], [7.25, 10.0], [7.47, 10.53], [8.0, 10.75], [8.25, 10.65], [8.5, 10.75], [9.03, 10.53], [9.18, 10.18], [9.53, 10.03], [9.75, 9.5], [9.53, 8.97], [9.0, 8.75], [8.75, 8.85], [8.63, 8.8], [8.68, 8.68], [9.03, 8.53], [9.18, 8.18], [9.25, 8.15], [9.5, 8.25], [9.75, 8.15], [10.0, 8.25], [10.53, 8.03], [10.75, 7.5], [10.53, 6.97], [10.18, 6.82], [10.15, 6.75], [10.25, 6.5], [10.03, 5.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.5, 6.75], [6.97, 6.97], [6.75, 7.5], [6.97, 8.03], [7.5, 8.25], [7.75, 8.15], [7.82, 8.18], [7.97, 8.53], [8.5, 8.75], [9.03, 8.53], [9.18, 8.18], [9.25, 8.15], [9.5, 8.25], [9.75, 8.15], [10.0, 8.25], [10.53, 8.03], [10.75, 7.5], [10.53, 6.97], [10.18, 6.82], [10.03, 6.47], [9.68, 6.32], [9.53, 5.97], [9.0, 5.75], [8.47, 5.97], [8.32, 6.32], [7.97, 6.47], [7.82, 6.82], [7.75, 6.85], [7.5, 6.75]]]]}, "2021-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.75, 8.0], [6.96, 8.5], [6.75, 9.0], [6.97, 9.53], [7.32, 9.68], [7.35, 9.75], [7.25, 10.0], [7.47, 10.53], [8.0, 10.75], [8.25, 10.65], [8.5, 10.75], [9.03, 10.53], [9.18, 10.18], [9.53, 10.03], [9.75, 9.5], [9.53, 8.97], [9.0, 8.75], [8.75, 8.85], [8.63, 8.8], [8.68, 8.68], [9.03, 8.53], [9.18, 8.18], [9.25, 8.15], [9.5, 8.25], [9.75, 8.15], [10.0, 8.25], [10.53, 8.03], [10.75, 7.5], [10.53, 6.97], [10.18, 6.82], [10.15, 6.75], [10.25, 6.5], [10.03, 5.97], [9.5, 5.75], [9.25, 5.85], [9.0, 5.75], [8.47, 5.97], [8.32, 6.32], [7.97, 6.47], [7.82, 6.82], [7.75, 6.85], [7.5, 6.75], [6.97, 6.97], [6.75, 7.5], [6.85, 7.75], [6.75, 8.0]]]]}, "2021-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.75, 8.0], [6.96, 8.5], [6.75, 9.0], [6.97, 9.53], [7.32, 9.68], [7.35, 9.75], [7.25, 10.0], [7.47, 10.53], [8.0, 10.75], [8.25, 10.65], [8.5, 10.75], [9.03, 10.53], [9.18, 10.18], [9.53, 10.03], [9.75, 9.5], [9.53, 8.97], [9.0, 8.75], [8.75, 8.85], [8.63, 8.8], [8.68, 8.68], [9.03, 8.53], [9.18, 8.18], [9.25, 8.15], [9.5, 8.25], [9.75, 8.15], [10.0, 8.25], [10.53, 8.03], [10.75, 7.5], [10.53, 6.97], [10.18, 6.82], [10.15, 6.75], [10.25, 6.5], [10.03, 5.97], [9.5, 5.75], [9.25, 5.85], [9.0, 5.75], [8.47, 5.97], [8.32, 6.32], [7.97, 6.47], [7.82, 6.82], [7.75, 6.85], [7.5, 6.75], [6.97, 6.97], [6.75, 7.5], [6.85, 7.75], [6.75, 8.0]]]]}, "2021-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.5, 5.75], [8.97, 5.97], [8.75, 6.5], [8.97, 7.03], [9.5, 7.25], [10.03, 7.03], [10.25, 6.5], [10.03, 5.97], [9.5, 5.75]]], [[[6.97, 9.53], [7.32, 9.68], [7.35, 9.75], [7.25, 10.0], [7.47, 10.53], [8.0, 10.75], [8.25, 10.65], [8.5, 10.75], [9.03, 10.53], [9.18, 10.18], [9.53, 10.03], [9.75, 9.5], [9.53, 8.97], [9.0, 8.75], [8.75, 8.85], [8.63, 8.8], [8.75, 8.5], [8.53, 7.97], [8.18, 7.82], [8.03, 7.47], [7.5, 7.25], [6.97, 7.47], [6.75, 8.0], [6.96, 8.5], [6.75, 9.0], [6.97, 9.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.0853808949403287}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.925930884612066}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.860319449283622, 24.51577759169328, 24.3980623312666, 23.042938021339182]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.746339718955085, 16.31838455970899, 16.11285265563106, 16.681068073963672]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.8370974196262233, -1.9248863288962952, -2.0383992412237206, -1.7868966731594658]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.0129915431839436, -2.9022904690179985, -3.0853808949403287, -2.4436377809728924]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5409612222636055, -1.4957766264844388, -1.6082704038097042, -1.373204962911738]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8560363831954694, -1.8271437719648629, -1.8554293878639214, -1.5229920687433194]}}