{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:20.637513", "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-23_to_2021-Dec-25_115.5_42.0"}, "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": 2021120000888}, "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 23 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 25 2021"}, "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": 54510.89860195595}, "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": 42.0}, "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": 115.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "115.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 115.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 120.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 42.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[115.32, 43.18], [115.35, 43.25], [115.25, 43.5], [115.47, 44.03], [116.0, 44.25], [116.25, 44.15], [116.5, 44.25], [116.75, 44.15], [117.0, 44.25], [117.25, 44.15], [117.5, 44.25], [118.03, 44.03], [118.18, 43.68], [118.25, 43.65], [118.5, 43.75], [118.75, 43.65], [119.0, 43.75], [119.53, 43.53], [119.68, 43.18], [120.03, 43.03], [120.18, 42.68], [120.53, 42.53], [120.75, 42.0], [120.53, 41.47], [120.0, 41.25], [119.75, 41.35], [119.5, 41.25], [119.25, 41.35], [119.0, 41.25], [118.75, 41.35], [118.5, 41.25], [117.97, 41.47], [117.82, 41.82], [117.5, 41.96], [117.0, 41.75], [116.75, 41.85], [116.5, 41.75], [116.25, 41.85], [116.18, 41.82], [116.03, 41.47], [115.5, 41.25], [114.97, 41.47], [114.75, 42.0], [114.85, 42.25], [114.75, 42.5], [114.97, 43.03], [115.32, 43.18]]]]}}, "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": {"2021-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[114.75, 42.5], [114.97, 43.03], [115.32, 43.18], [115.35, 43.25], [115.25, 43.5], [115.47, 44.03], [116.0, 44.25], [116.25, 44.15], [116.5, 44.25], [116.75, 44.15], [117.0, 44.25], [117.25, 44.15], [117.5, 44.25], [118.03, 44.03], [118.18, 43.68], [118.25, 43.65], [118.5, 43.75], [118.75, 43.65], [119.0, 43.75], [119.53, 43.53], [119.68, 43.18], [120.03, 43.03], [120.18, 42.68], [120.53, 42.53], [120.75, 42.0], [120.53, 41.47], [120.0, 41.25], [119.75, 41.35], [119.5, 41.25], [119.25, 41.35], [119.0, 41.25], [118.75, 41.35], [118.5, 41.25], [117.97, 41.47], [117.82, 41.82], [117.5, 41.96], [117.0, 41.75], [116.75, 41.85], [116.5, 41.75], [116.25, 41.85], [116.18, 41.82], [116.03, 41.47], [115.5, 41.25], [114.97, 41.47], [114.75, 42.0], [114.85, 42.25], [114.75, 42.5]]]]}, "2021-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[114.75, 42.5], [114.97, 43.03], [115.32, 43.18], [115.35, 43.25], [115.25, 43.5], [115.47, 44.03], [116.0, 44.25], [116.25, 44.15], [116.5, 44.25], [116.75, 44.15], [117.0, 44.25], [117.25, 44.15], [117.5, 44.25], [118.03, 44.03], [118.18, 43.68], [118.25, 43.65], [118.5, 43.75], [118.75, 43.65], [119.0, 43.75], [119.53, 43.53], [119.68, 43.18], [120.03, 43.03], [120.18, 42.68], [120.53, 42.53], [120.75, 42.0], [120.53, 41.47], [120.0, 41.25], [119.75, 41.35], [119.5, 41.25], [119.25, 41.35], [119.0, 41.25], [118.75, 41.35], [118.5, 41.25], [117.97, 41.47], [117.82, 41.82], [117.5, 41.96], [117.0, 41.75], [116.75, 41.85], [116.5, 41.75], [116.25, 41.85], [116.18, 41.82], [116.03, 41.47], [115.5, 41.25], [114.97, 41.47], [114.75, 42.0], [114.85, 42.25], [114.75, 42.5]]]]}, "2021-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[114.75, 42.5], [114.97, 43.03], [115.32, 43.18], [115.35, 43.25], [115.25, 43.5], [115.47, 44.03], [116.0, 44.25], [116.25, 44.15], [116.5, 44.25], [116.75, 44.15], [117.0, 44.25], [117.25, 44.15], [117.5, 44.25], [118.03, 44.03], [118.18, 43.68], [118.25, 43.65], [118.5, 43.75], [118.75, 43.65], [119.0, 43.75], [119.53, 43.53], [119.68, 43.18], [120.03, 43.03], [120.18, 42.68], [120.53, 42.53], [120.75, 42.0], [120.53, 41.47], [120.0, 41.25], [119.75, 41.35], [119.5, 41.25], [119.25, 41.35], [119.0, 41.25], [118.75, 41.35], [118.5, 41.25], [117.97, 41.47], [117.82, 41.82], [117.5, 41.96], [117.0, 41.75], [116.75, 41.85], [116.5, 41.75], [116.25, 41.85], [116.18, 41.82], [116.03, 41.47], [115.5, 41.25], [114.97, 41.47], [114.75, 42.0], [114.85, 42.25], [114.75, 42.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -13.885739384332737}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.041081701789452}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-20.781527064938217, -24.23454964765324, -22.139970819329477]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-25.79109451133047, -28.72427634661406, -26.97981925005118]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.68071728775758, -10.921963240405754, -8.520564577205018]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.12552097338721, -13.885739384332737, -11.414142067751413]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6757448246476925, -2.3788986348425762, -1.8520968212516733]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.123817646870479, -2.9559973478561212, -2.4079445449794]}}