{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:03:30.567383", "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": "2025-Feb-21_to_2025-Feb-23_114.5_39.5"}, "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": 2025020000482}, "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 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 23 2025"}, "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": 66414.44020117883}, "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": ["China"]}, "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": []}, "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": 39.5}, "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": 114.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "114.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 113.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 116.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[112.47, 42.03], [113.0, 42.25], [113.25, 42.15], [113.5, 42.25], [114.03, 42.03], [114.18, 41.68], [114.25, 41.65], [114.5, 41.75], [115.03, 41.53], [115.18, 41.18], [115.25, 41.15], [115.5, 41.25], [115.75, 41.15], [116.0, 41.25], [116.53, 41.03], [116.75, 40.5], [116.65, 40.25], [116.68, 40.18], [117.03, 40.03], [117.25, 39.5], [117.15, 39.25], [117.25, 39.0], [117.15, 38.75], [117.25, 38.5], [117.03, 37.97], [116.5, 37.75], [116.25, 37.85], [116.0, 37.75], [115.75, 37.85], [115.5, 37.75], [115.25, 37.85], [115.0, 37.75], [114.47, 37.97], [114.25, 38.5], [114.35, 38.75], [114.32, 38.82], [113.97, 38.97], [113.82, 39.32], [113.75, 39.35], [113.5, 39.25], [112.97, 39.47], [112.75, 40.0], [112.96, 40.5], [112.82, 40.82], [112.47, 40.97], [112.25, 41.5], [112.47, 42.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.C.Asia", "E.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.47, 40.97], [112.25, 41.5], [112.47, 42.03], [113.0, 42.25], [113.25, 42.15], [113.5, 42.25], [114.03, 42.03], [114.18, 41.68], [114.25, 41.65], [114.5, 41.75], [115.03, 41.53], [115.18, 41.18], [115.25, 41.15], [115.5, 41.25], [115.75, 41.15], [116.0, 41.25], [116.53, 41.03], [116.75, 40.5], [116.65, 40.25], [116.68, 40.18], [117.03, 40.03], [117.25, 39.5], [117.15, 39.25], [117.25, 39.0], [117.15, 38.75], [117.25, 38.5], [117.03, 37.97], [116.5, 37.75], [116.25, 37.85], [116.0, 37.75], [115.75, 37.85], [115.5, 37.75], [115.25, 37.85], [115.0, 37.75], [114.47, 37.97], [114.25, 38.5], [114.35, 38.75], [114.32, 38.82], [113.97, 38.97], [113.82, 39.32], [113.75, 39.35], [113.5, 39.25], [112.97, 39.47], [112.75, 40.0], [112.96, 40.5], [112.82, 40.82], [112.47, 40.97]]]]}, "2025-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.47, 40.97], [112.25, 41.5], [112.47, 42.03], [113.0, 42.25], [113.25, 42.15], [113.5, 42.25], [114.03, 42.03], [114.18, 41.68], [114.25, 41.65], [114.5, 41.75], [115.03, 41.53], [115.18, 41.18], [115.25, 41.15], [115.5, 41.25], [115.75, 41.15], [116.0, 41.25], [116.53, 41.03], [116.75, 40.5], [116.65, 40.25], [116.68, 40.18], [117.03, 40.03], [117.25, 39.5], [117.15, 39.25], [117.25, 39.0], [117.15, 38.75], [117.25, 38.5], [117.03, 37.97], [116.5, 37.75], [116.25, 37.85], [116.0, 37.75], [115.75, 37.85], [115.5, 37.75], [115.25, 37.85], [115.0, 37.75], [114.47, 37.97], [114.25, 38.5], [114.35, 38.75], [114.32, 38.82], [113.97, 38.97], [113.82, 39.32], [113.75, 39.35], [113.5, 39.25], [112.97, 39.47], [112.75, 40.0], [112.96, 40.5], [112.82, 40.82], [112.47, 40.97]]]]}, "2025-02-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.47, 40.97], [112.25, 41.5], [112.47, 42.03], [113.0, 42.25], [113.25, 42.15], [113.5, 42.25], [114.03, 42.03], [114.18, 41.68], [114.25, 41.65], [114.5, 41.75], [115.03, 41.53], [115.18, 41.18], [115.25, 41.15], [115.5, 41.25], [115.75, 41.15], [116.0, 41.25], [116.53, 41.03], [116.75, 40.5], [116.65, 40.25], [116.68, 40.18], [117.03, 40.03], [117.25, 39.5], [117.15, 39.25], [117.25, 39.0], [117.15, 38.75], [117.25, 38.5], [117.03, 37.97], [116.5, 37.75], [116.25, 37.85], [116.0, 37.75], [115.75, 37.85], [115.5, 37.75], [115.25, 37.85], [115.0, 37.75], [114.47, 37.97], [114.25, 38.5], [114.35, 38.75], [114.32, 38.82], [113.97, 38.97], [113.82, 39.32], [113.75, 39.35], [113.5, 39.25], [112.97, 39.47], [112.75, 40.0], [112.96, 40.5], [112.82, 40.82], [112.47, 40.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.551503132935181}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.848508601900711}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-7.581009519667816, -7.677664343515971, -6.977618122100807]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.591907882690407, -16.730045064290323, -13.81778500874833]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.725968952011617, -6.1172807328087675, -5.70227612088175]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.011492519917454, -9.551503132935181, -7.776218195240801]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4649079184461808, -1.5824124779828774, -1.5682882876852224]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.661807100466803, -1.8877223701865826, -2.0268026328588826]}}