{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:25:13.277139", "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": "2022-Dec-21_to_2022-Dec-31_84.5_44.5"}, "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": 2022120000992}, "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 21 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 31 2022"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 11}, "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": 74387.85446512754}, "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": 44.5}, "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": 84.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "84.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 84.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 90.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 44.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 46.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.35, 44.75], [83.25, 45.0], [83.47, 45.53], [83.82, 45.68], [83.97, 46.03], [84.5, 46.25], [84.75, 46.15], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [87.03, 46.53], [87.18, 46.18], [87.53, 46.03], [87.68, 45.68], [88.03, 45.53], [88.18, 45.18], [88.25, 45.15], [88.5, 45.25], [88.75, 45.15], [88.82, 45.18], [88.97, 45.53], [89.5, 45.75], [89.75, 45.65], [90.0, 45.75], [90.53, 45.53], [90.68, 45.18], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [86.97, 43.47], [86.82, 43.82], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Siberia", "E.Siberia", "E.C.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[90.0, 43.75], [89.47, 43.97], [89.25, 44.5], [89.47, 45.03], [90.0, 45.25], [90.25, 45.15], [90.5, 45.25], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75]]]]}, "2022-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[90.0, 43.75], [89.47, 43.97], [89.25, 44.5], [89.47, 45.03], [90.0, 45.25], [90.25, 45.15], [90.5, 45.25], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75]]]]}, "2022-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[88.97, 44.47], [88.75, 45.0], [88.97, 45.53], [89.5, 45.75], [89.75, 45.65], [90.0, 45.75], [90.53, 45.53], [90.68, 45.18], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75], [89.47, 43.97], [89.32, 44.32], [88.97, 44.47]]]]}, "2022-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[88.75, 45.0], [88.97, 45.53], [89.5, 45.75], [89.75, 45.65], [90.0, 45.75], [90.53, 45.53], [90.68, 45.18], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [88.97, 43.97], [88.75, 44.5], [88.85, 44.75], [88.75, 45.0]]]]}, "2022-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.85, 45.25], [83.75, 45.5], [83.97, 46.03], [84.5, 46.25], [84.75, 46.15], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [86.03, 46.53], [86.25, 46.0], [86.03, 45.47], [85.68, 45.32], [85.63, 45.2], [85.75, 45.15], [86.0, 45.25], [86.25, 45.15], [86.32, 45.18], [86.47, 45.53], [87.0, 45.75], [87.25, 45.65], [87.5, 45.75], [88.03, 45.53], [88.18, 45.18], [88.25, 45.15], [88.5, 45.25], [88.75, 45.15], [88.82, 45.18], [88.97, 45.53], [89.5, 45.75], [89.75, 45.65], [90.0, 45.75], [90.53, 45.53], [90.68, 45.18], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [86.97, 43.47], [86.82, 43.82], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.47, 45.03], [83.82, 45.18], [83.85, 45.25]]]]}, "2022-12-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.25, 45.0], [83.47, 45.53], [83.82, 45.68], [83.97, 46.03], [84.5, 46.25], [84.75, 46.15], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.53, 46.53], [86.68, 46.18], [87.03, 46.03], [87.18, 45.68], [87.25, 45.65], [87.5, 45.75], [88.03, 45.53], [88.18, 45.18], [88.25, 45.15], [88.5, 45.25], [88.75, 45.15], [89.0, 45.25], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.25, 45.15], [90.5, 45.25], [91.03, 45.03], [91.25, 44.5], [91.03, 43.97], [90.5, 43.75], [90.25, 43.85], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [86.97, 43.47], [86.82, 43.82], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.35, 44.75], [83.25, 45.0]]]]}, "2022-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.25, 45.0], [83.47, 45.53], [83.82, 45.68], [83.97, 46.03], [84.5, 46.25], [84.75, 46.15], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [87.03, 46.53], [87.18, 46.18], [87.53, 46.03], [87.68, 45.68], [88.03, 45.53], [88.18, 45.18], [88.25, 45.15], [88.5, 45.25], [88.75, 45.15], [89.0, 45.25], [89.53, 45.03], [89.75, 44.5], [89.53, 43.97], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [86.97, 43.47], [86.82, 43.82], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.35, 44.75], [83.25, 45.0]]]]}, "2022-12-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.25, 45.0], [83.47, 45.53], [84.0, 45.75], [84.25, 45.65], [84.32, 45.68], [84.47, 46.03], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [87.03, 46.53], [87.18, 46.18], [87.53, 46.03], [87.68, 45.68], [88.03, 45.53], [88.18, 45.18], [88.25, 45.15], [88.5, 45.25], [88.75, 45.15], [89.0, 45.25], [89.53, 45.03], [89.75, 44.5], [89.53, 43.97], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.0, 43.75], [87.75, 43.85], [87.5, 43.75], [87.25, 43.85], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.35, 44.75], [83.25, 45.0]]]]}, "2022-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.25, 45.0], [83.47, 45.53], [84.0, 45.75], [84.25, 45.65], [84.32, 45.68], [84.47, 46.03], [84.82, 46.18], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [87.03, 46.53], [87.18, 46.18], [87.53, 46.03], [87.68, 45.68], [88.03, 45.53], [88.18, 45.18], [88.5, 45.04], [89.0, 45.25], [89.53, 45.03], [89.75, 44.5], [89.53, 43.97], [89.0, 43.75], [88.5, 43.96], [88.0, 43.75], [87.75, 43.85], [87.5, 43.75], [87.25, 43.85], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.75, 43.85], [85.5, 43.75], [85.25, 43.85], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [84.25, 43.85], [84.0, 43.75], [83.47, 43.97], [83.25, 44.5], [83.35, 44.75], [83.25, 45.0]]]]}, "2022-12-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.75, 45.0], [83.97, 45.53], [84.5, 45.75], [84.75, 45.65], [84.88, 45.7], [84.75, 46.0], [84.97, 46.53], [85.5, 46.75], [85.75, 46.65], [86.0, 46.75], [86.53, 46.53], [86.75, 46.0], [86.63, 45.7], [87.03, 45.53], [87.18, 45.18], [87.53, 45.03], [87.75, 44.5], [87.53, 43.97], [87.0, 43.75], [86.47, 43.97], [86.32, 44.32], [86.25, 44.35], [86.0, 44.25], [85.7, 44.38], [85.53, 43.97], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [83.97, 43.97], [83.75, 44.5], [83.85, 44.75], [83.75, 45.0]]]]}, "2022-12-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.75, 45.0], [83.97, 45.53], [84.5, 45.75], [85.03, 45.53], [85.18, 45.18], [85.53, 45.03], [85.75, 44.5], [85.53, 43.97], [85.0, 43.75], [84.75, 43.85], [84.5, 43.75], [83.97, 43.97], [83.75, 44.5], [83.85, 44.75], [83.75, 45.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.67819227773478}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.409793460864735}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-16.495864511652996, -15.403955919706618, -15.880183455897225, -19.412724057100206, -21.035978435523617, -23.126927098105313, -24.13017878293354, -24.637130860216672, -24.288145785134503, -22.243119500394982, -21.044135942230213]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.623761482000702, -15.618308007523353, -16.126930943342302, -20.172397020699805, -25.314084338108046, -28.594931383571264, -28.54944642309465, -28.359555136245376, -27.16522115181826, -24.385247752611377, -21.947186485935703]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.686463300452033, -5.421746277534339, -6.221708088159929, -9.255531673116412, -7.742620922313164, -8.651270983470981, -8.95511298540222, -9.108645889242641, -8.686391347747726, -6.778479235329424, -6.69447646706961]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.930302898450918, -5.498515337180834, -6.889220361590901, -10.728258323530696, -9.91238485270253, -12.67819227773478, -11.819409690337864, -11.509132917878958, -10.584667988771685, -7.3448153249844665, -6.920938320850979]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.683608048618842, -1.3635945005539862, -1.5076812488563953, -2.2371761015099274, -1.7070130081882369, -1.861749175550466, -1.879355842875664, -1.8761620546874456, -1.7395981627724895, -1.3896363218062577, -1.417045388435011]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7745994536675112, -1.369248610682809, -1.5844355376672314, -2.520106792532189, -2.515932356393335, -2.4946325529790374, -2.2934296317523044, -2.180313283561207, -2.190848474776974, -1.5057670337768867, -1.5016703103371576]}}