{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:55:10.059173", "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": "2023-Sep-06_to_2023-Sep-11_113.5_23.0"}, "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": 2023090000202}, "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": "September 06 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 11 2023"}, "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": 116819.6148212949}, "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", "Hong Kong"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "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": ["South China Sea"]}, "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": 23.0}, "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": 113.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "113.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 110.5}, "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": 21.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 24.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[109.97, 23.53], [110.32, 23.68], [110.47, 24.03], [111.0, 24.25], [111.25, 24.15], [111.5, 24.25], [112.0, 24.04], 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"description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-09-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[113.47, 24.53], [114.0, 24.75], [114.53, 24.53], [114.75, 24.0], [114.53, 23.47], [114.0, 23.25], [113.47, 23.47], [113.25, 24.0], [113.47, 24.53]]]]}, "2023-09-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.75, 23.0], [112.97, 23.53], [113.38, 23.7], [113.25, 24.0], [113.47, 24.53], [114.0, 24.75], [114.5, 24.54], [115.0, 24.75], [115.25, 24.65], [115.5, 24.75], [116.03, 24.53], [116.18, 24.18], [116.25, 24.15], [116.5, 24.25], [117.03, 24.03], [117.25, 23.5], [117.03, 22.97], [116.68, 22.82], [116.53, 22.47], [116.0, 22.25], [115.75, 22.35], [115.5, 22.25], [115.25, 22.35], [115.0, 22.25], [114.75, 22.35], [114.68, 22.32], [114.53, 21.97], [114.0, 21.75], [113.75, 21.85], [113.5, 21.75], [112.97, 21.97], [112.75, 22.5], [112.85, 22.75], [112.75, 23.0]]]]}, 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20.97], [109.75, 21.5], [109.85, 21.75], [109.75, 22.0]]]]}, "2023-09-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[110.5, 21.25], [109.97, 21.47], [109.75, 22.0], [109.97, 22.53], [110.5, 22.75], [110.75, 22.65], [110.82, 22.68], [110.85, 22.75], [110.75, 23.0], [110.85, 23.25], [110.75, 23.5], [110.97, 24.03], [111.5, 24.25], [112.0, 24.04], [112.5, 24.25], [113.03, 24.03], [113.18, 23.68], [113.25, 23.65], [113.5, 23.75], [114.03, 23.53], [114.25, 23.0], [114.15, 22.75], [114.18, 22.68], [114.53, 22.53], [114.75, 22.0], [114.53, 21.47], [114.0, 21.25], [113.47, 21.47], [113.32, 21.82], [113.25, 21.85], [113.18, 21.82], [113.03, 21.47], [112.5, 21.25], [112.25, 21.35], [112.0, 21.25], [111.75, 21.35], [111.5, 21.25], [111.25, 21.35], [111.0, 21.25], [110.75, 21.35], [110.5, 21.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.0031865220162786}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.070488204128502}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [23.984971676135103, 25.550527874143256, 25.205058846290513, 25.362394202755354, 25.262214771070603, 25.54067607734885]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.984971676135103, 23.928465150805323, 23.28143258314941, 23.81553423172346, 23.588933209362096, 24.216664856302316]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.850032607021717, -1.8592473011730952, -2.197133633075734, -2.0449365707069647, -2.1637236263090855, -1.874920942539963]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.850032607021717, 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