{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:17:33.938001", "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": "2022-Feb-20_to_2022-Feb-23_143.0_38.5"}, "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": 2022020000860}, "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": "February 20 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 23 2022"}, "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": 80591.52626004837}, "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": ["Japan"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": ["Pacific Ocean"]}, "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": 38.5}, "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": 143.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "143.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 141.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 144.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 39.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[140.47, 38.53], [141.0, 38.75], [141.25, 38.65], [141.32, 38.68], [141.47, 39.03], [141.82, 39.18], [141.97, 39.53], [142.5, 39.75], [142.75, 39.65], [143.0, 39.75], [143.25, 39.65], [143.5, 39.75], [144.03, 39.53], [144.18, 39.18], [144.25, 39.15], [144.5, 39.25], [145.03, 39.03], [145.25, 38.5], [145.15, 38.25], [145.25, 38.0], [145.15, 37.75], [145.25, 37.5], [145.03, 36.97], [144.68, 36.82], [144.53, 36.47], [144.0, 36.25], [143.75, 36.35], [143.68, 36.32], [143.53, 35.97], [143.0, 35.75], [142.47, 35.97], [142.32, 36.32], [142.25, 36.35], [142.0, 36.25], [141.75, 36.35], [141.5, 36.25], [141.25, 36.35], [141.0, 36.25], [140.47, 36.47], [140.25, 37.0], [140.35, 37.25], [140.25, 37.5], [140.35, 37.75], [140.25, 38.0], [140.47, 38.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Asia", "N.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-02-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[142.47, 39.03], [143.0, 39.25], [143.53, 39.03], [143.75, 38.5], [143.53, 37.97], [143.0, 37.75], [142.47, 37.97], [142.25, 38.5], [142.47, 39.03]]]]}, "2022-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[140.25, 37.5], [140.35, 37.75], [140.25, 38.0], [140.47, 38.53], [141.0, 38.75], [141.25, 38.65], [141.32, 38.68], [141.47, 39.03], [141.82, 39.18], [141.97, 39.53], [142.5, 39.75], [142.75, 39.65], [143.0, 39.75], [143.25, 39.65], [143.5, 39.75], [144.03, 39.53], [144.18, 39.18], [144.25, 39.15], [144.5, 39.25], [145.03, 39.03], [145.25, 38.5], [145.15, 38.25], [145.25, 38.0], [145.15, 37.75], [145.25, 37.5], [145.03, 36.97], [144.68, 36.82], [144.53, 36.47], [144.0, 36.25], [143.75, 36.35], [143.68, 36.32], [143.53, 35.97], [143.0, 35.75], [142.47, 35.97], [142.32, 36.32], [142.25, 36.35], [142.0, 36.25], [141.75, 36.35], [141.5, 36.25], [141.25, 36.35], [141.0, 36.25], [140.47, 36.47], [140.25, 37.0], [140.35, 37.25], [140.25, 37.5]]]]}, "2022-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[140.25, 37.5], [140.35, 37.75], [140.25, 38.0], [140.47, 38.53], [141.0, 38.75], [141.25, 38.65], [141.32, 38.68], [141.47, 39.03], [141.82, 39.18], [141.97, 39.53], [142.5, 39.75], [142.75, 39.65], [143.0, 39.75], [143.25, 39.65], [143.5, 39.75], [144.03, 39.53], [144.18, 39.18], [144.25, 39.15], [144.5, 39.25], [145.03, 39.03], [145.25, 38.5], [145.15, 38.25], [145.25, 38.0], [145.15, 37.75], [145.25, 37.5], [145.03, 36.97], [144.68, 36.82], [144.53, 36.47], [144.0, 36.25], [143.75, 36.35], [143.68, 36.32], [143.53, 35.97], [143.0, 35.75], [142.47, 35.97], [142.32, 36.32], [142.25, 36.35], [142.0, 36.25], [141.75, 36.35], [141.5, 36.25], [141.25, 36.35], [141.0, 36.25], [140.47, 36.47], [140.25, 37.0], [140.35, 37.25], [140.25, 37.5]]]]}, "2022-02-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[140.25, 37.5], [140.35, 37.75], [140.25, 38.0], [140.47, 38.53], [141.0, 38.75], [141.25, 38.65], [141.32, 38.68], [141.47, 39.03], [141.82, 39.18], [141.97, 39.53], [142.5, 39.75], [142.75, 39.65], [143.0, 39.75], [143.25, 39.65], [143.5, 39.75], [144.03, 39.53], [144.18, 39.18], [144.25, 39.15], [144.5, 39.25], [145.03, 39.03], [145.25, 38.5], [145.15, 38.25], [145.25, 38.0], [145.15, 37.75], [145.25, 37.5], [145.03, 36.97], [144.68, 36.82], [144.53, 36.47], [144.0, 36.25], [143.75, 36.35], [143.68, 36.32], [143.53, 35.97], [143.0, 35.75], [142.47, 35.97], [142.32, 36.32], [142.25, 36.35], [142.0, 36.25], [141.75, 36.35], [141.5, 36.25], [141.25, 36.35], [141.0, 36.25], [140.47, 36.47], [140.25, 37.0], [140.35, 37.25], [140.25, 37.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.914060774882728}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.932472513745589}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [1.4897668074791, 1.3738954499237366, 1.3037158682290055, 2.0047989300040285]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.4897668074791, -0.7291929187745723, -0.4861870836300568, 0.586864835484846]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.9025812428646987, -3.9983873020456215, -4.20179389325296, -3.6284451723285165]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.9025812428646987, -4.69173364790538, -4.914060774882728, -4.434427858198546]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2653254453338907, -1.6730127373310006, -1.7029470174467123, -1.4688091503964076]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.2653254453338907, -2.0551123011601895, -2.0283937261540554, -1.7395624426082679]}}