{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:21.382086", "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-25_to_2021-Dec-27_103.0_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": 2021120000965}, "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 25 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 27 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": 50271.917475530514}, "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": 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": 103.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "103.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 100.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 104.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.0}, "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": [[[[99.25, 41.0], [99.47, 41.53], [100.0, 41.75], [100.53, 41.53], [100.75, 41.0], [100.65, 40.75], [100.68, 40.68], [100.75, 40.65], [101.0, 40.75], [101.53, 40.53], [101.68, 40.18], [102.0, 40.04], [102.5, 40.25], [102.75, 40.15], [103.0, 40.25], [103.25, 40.15], [103.5, 40.25], [103.75, 40.15], [104.0, 40.25], [104.53, 40.03], [104.75, 39.5], [104.65, 39.25], [104.75, 39.0], [104.65, 38.75], [104.75, 38.5], [104.53, 37.97], [104.18, 37.82], [104.03, 37.47], [103.5, 37.25], [103.25, 37.35], [103.0, 37.25], [102.47, 37.47], [102.32, 37.82], [101.97, 37.97], [101.82, 38.32], [101.47, 38.47], [101.32, 38.82], [100.97, 38.97], [100.82, 39.32], [100.75, 39.35], [100.5, 39.25], [100.25, 39.35], [100.0, 39.25], [99.47, 39.47], [99.25, 40.0], [99.35, 40.25], [99.25, 40.5], [99.35, 40.75], [99.25, 41.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.C.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[99.25, 40.5], [99.35, 40.75], [99.25, 41.0], [99.47, 41.53], [100.0, 41.75], [100.53, 41.53], [100.75, 41.0], [100.65, 40.75], [100.68, 40.68], [100.75, 40.65], [101.0, 40.75], [101.53, 40.53], [101.68, 40.18], [102.0, 40.04], [102.5, 40.25], [102.75, 40.15], [103.0, 40.25], [103.25, 40.15], [103.5, 40.25], [103.75, 40.15], [104.0, 40.25], [104.53, 40.03], [104.75, 39.5], [104.65, 39.25], [104.75, 39.0], [104.65, 38.75], [104.75, 38.5], [104.53, 37.97], [104.18, 37.82], [104.03, 37.47], [103.5, 37.25], [103.25, 37.35], [103.0, 37.25], [102.47, 37.47], [102.32, 37.82], [101.97, 37.97], [101.82, 38.32], [101.47, 38.47], [101.32, 38.82], [100.97, 38.97], [100.82, 39.32], [100.75, 39.35], [100.5, 39.25], [100.25, 39.35], [100.0, 39.25], [99.47, 39.47], [99.25, 40.0], [99.35, 40.25], [99.25, 40.5]]]]}, "2021-12-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[99.25, 40.5], [99.35, 40.75], [99.25, 41.0], [99.47, 41.53], [100.0, 41.75], [100.53, 41.53], [100.75, 41.0], [100.65, 40.75], [100.68, 40.68], [100.75, 40.65], [101.0, 40.75], [101.53, 40.53], [101.68, 40.18], [102.0, 40.04], [102.5, 40.25], [102.75, 40.15], [103.0, 40.25], [103.25, 40.15], [103.5, 40.25], [103.75, 40.15], [104.0, 40.25], [104.53, 40.03], [104.75, 39.5], [104.65, 39.25], [104.75, 39.0], [104.65, 38.75], [104.75, 38.5], [104.53, 37.97], [104.18, 37.82], [104.03, 37.47], [103.5, 37.25], [103.25, 37.35], [103.0, 37.25], [102.47, 37.47], [102.32, 37.82], [101.97, 37.97], [101.82, 38.32], [101.47, 38.47], [101.32, 38.82], [100.97, 38.97], [100.82, 39.32], [100.75, 39.35], [100.5, 39.25], [100.25, 39.35], [100.0, 39.25], [99.47, 39.47], [99.25, 40.0], [99.35, 40.25], [99.25, 40.5]]]]}, "2021-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[99.25, 40.5], [99.35, 40.75], [99.25, 41.0], [99.47, 41.53], [100.0, 41.75], [100.53, 41.53], [100.75, 41.0], [100.65, 40.75], [100.68, 40.68], [100.75, 40.65], [101.0, 40.75], [101.53, 40.53], [101.68, 40.18], [102.0, 40.04], [102.5, 40.25], [102.75, 40.15], [103.0, 40.25], [103.25, 40.15], [103.5, 40.25], [103.75, 40.15], [104.0, 40.25], [104.53, 40.03], [104.75, 39.5], [104.65, 39.25], [104.75, 39.0], [104.65, 38.75], [104.75, 38.5], [104.53, 37.97], [104.18, 37.82], [104.03, 37.47], [103.5, 37.25], [103.25, 37.35], [103.0, 37.25], [102.47, 37.47], [102.32, 37.82], [101.97, 37.97], [101.82, 38.32], [101.47, 38.47], [101.32, 38.82], [100.97, 38.97], [100.82, 39.32], [100.75, 39.35], [100.5, 39.25], [100.25, 39.35], [100.0, 39.25], [99.47, 39.47], [99.25, 40.0], [99.35, 40.25], [99.25, 40.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.938697698222228}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.195509613118671}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-14.793653171095286, -16.0038256392304, -14.859226993101117]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.42596515125041, -18.26191970740942, -16.45153855625557]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.941353919205115, -7.973685264103575, -6.671489656047323]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.110063976156994, -8.938697698222228, -7.916157869001381]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7048903576799608, -1.8957556055787745, -1.5437343646868944]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.197585663370519, -2.174535521381322, -1.7768250386576936]}}