{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:14:16.318752", "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-Oct-15_to_2021-Oct-20_117.0_40.0"}, "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": 2021100000556}, "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": "October 15 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "October 20 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 68682.46935862416}, "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": 40.0}, "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": 117.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "117.0\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": 117.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.75, 38.85], [113.5, 38.75], [113.25, 38.85], [113.0, 38.75], [112.47, 38.97], [112.25, 39.5], [112.35, 39.75], [112.25, 40.0], [112.35, 40.25], [112.25, 40.5], [112.47, 41.03], [113.0, 41.25], [113.25, 41.15], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.63, 40.7], [116.75, 40.65], [117.0, 40.75]]]]}}, "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": {"2021-10-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.25, 40.0], [112.35, 40.25], [112.25, 40.5], [112.47, 41.03], [113.0, 41.25], [113.25, 41.15], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.53, 40.47], [116.18, 40.32], [116.03, 39.97], [115.68, 39.82], [115.53, 39.47], [115.0, 39.25], [114.75, 39.35], [114.5, 39.25], [114.25, 39.35], [114.0, 39.25], [113.75, 39.35], [113.68, 39.32], [113.53, 38.97], [113.0, 38.75], [112.47, 38.97], [112.25, 39.5], [112.35, 39.75], [112.25, 40.0]]]]}, "2021-10-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.25, 40.0], [112.35, 40.25], [112.25, 40.5], [112.47, 41.03], [113.0, 41.25], [113.25, 41.15], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.63, 40.7], [116.75, 40.65], [117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.5, 38.96], [113.0, 38.75], [112.47, 38.97], [112.25, 39.5], [112.35, 39.75], [112.25, 40.0]]]]}, "2021-10-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.25, 40.0], [112.35, 40.25], [112.25, 40.5], [112.47, 41.03], [113.0, 41.25], [113.25, 41.15], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.63, 40.7], [116.75, 40.65], [117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.5, 38.96], [113.0, 38.75], [112.47, 38.97], [112.25, 39.5], [112.35, 39.75], [112.25, 40.0]]]]}, "2021-10-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.75, 40.5], [112.97, 41.03], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.63, 40.7], [116.75, 40.65], [117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.75, 38.85], [113.5, 38.75], [112.97, 38.97], [112.75, 39.5], [112.96, 40.0], [112.75, 40.5]]]]}, "2021-10-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.75, 40.5], [112.97, 41.03], [113.5, 41.25], [113.75, 41.15], [113.82, 41.18], [113.97, 41.53], [114.5, 41.75], [114.75, 41.65], [115.0, 41.75], [115.25, 41.65], [115.5, 41.75], [115.75, 41.65], [116.0, 41.75], [116.53, 41.53], [116.75, 41.0], [116.63, 40.7], [116.75, 40.65], [117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.75, 38.85], [113.5, 38.75], [112.97, 38.97], [112.75, 39.5], [112.96, 40.0], [112.75, 40.5]]]]}, "2021-10-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[113.5, 38.75], [112.97, 38.97], [112.75, 39.5], [112.97, 40.03], [113.5, 40.25], [113.75, 40.15], [114.0, 40.25], [114.43, 40.07], [114.25, 40.5], [114.47, 41.03], [115.0, 41.25], [115.25, 41.15], [115.5, 41.25], [116.03, 41.03], [116.2, 40.63], [116.5, 40.75], [116.75, 40.65], [117.0, 40.75], [117.25, 40.65], [117.5, 40.75], [118.03, 40.53], [118.25, 40.0], [118.03, 39.47], [117.68, 39.32], [117.53, 38.97], [117.18, 38.82], [117.03, 38.47], [116.5, 38.25], [116.25, 38.35], [116.0, 38.25], [115.75, 38.35], [115.5, 38.25], [115.25, 38.35], [115.0, 38.25], [114.47, 38.47], [114.3, 38.88], [114.0, 38.75], [113.75, 38.85], [113.5, 38.75]], [[114.82, 39.68], [114.88, 39.8], [114.57, 39.93], [114.7, 39.63], [114.82, 39.68]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.07667589488409}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.4728517238088745}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [2.7945454732209214, 1.6013955760668068, 5.1283538267065865, 6.308444488216935, 3.671101792270008, 6.337756946149568]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-0.9701462054889021, -3.788255755615978, 0.8188881315600725, 0.4974857698211963, -1.9644141304462437, 1.7447469274833338]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.5873153095179156, -8.159167704823776, -4.569120560135638, -3.652176048707195, -6.05775775228247, -5.067163674619697]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.6705152860564, -9.07667589488409, -5.890201107672169, -4.521347481002692, -6.899237590820746, -5.784582912198516]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5667764383521958, -2.9972636968216455, -1.7084476242345275, -1.360869342940865, -2.267324099817388, -1.9647085697669346]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8718917367490713, -3.3561393183750186, -2.399223934826984, -1.5087755578976128, -2.722287892415345, -2.3033656524728094]}}