{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:10.428368", "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-15_to_2021-Dec-18_129.0_48.0"}, "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": 2021120000599}, "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 15 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 18 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 58068.84759631406}, "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", "Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "Europe"]}, "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": 48.0}, "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": 129.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "129.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 128.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 131.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 46.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 49.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[127.25, 48.0], [127.47, 48.53], [127.82, 48.68], [127.97, 49.03], [128.5, 49.25], [128.75, 49.15], [129.0, 49.25], [129.25, 49.15], [129.32, 49.18], [129.35, 49.25], [129.25, 49.5], [129.47, 50.03], [130.0, 50.25], [130.53, 50.03], [130.68, 49.68], [131.03, 49.53], [131.25, 49.0], [131.15, 48.75], [131.18, 48.68], [131.25, 48.65], [131.5, 48.75], [132.03, 48.53], [132.25, 48.0], [132.03, 47.47], [131.5, 47.25], [131.25, 47.35], [131.18, 47.32], [131.03, 46.97], [130.68, 46.82], [130.53, 46.47], [130.18, 46.32], [130.03, 45.97], [129.5, 45.75], [129.25, 45.85], [129.0, 45.75], [128.47, 45.97], [128.32, 46.32], [127.97, 46.47], [127.82, 46.82], [127.47, 46.97], [127.25, 47.5], [127.35, 47.75], [127.25, 48.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia", "Russian-Far-East"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[127.97, 49.03], [128.5, 49.25], [128.75, 49.15], [129.0, 49.25], [129.25, 49.15], [129.32, 49.18], [129.35, 49.25], [129.25, 49.5], [129.47, 50.03], [130.0, 50.25], [130.53, 50.03], [130.75, 49.5], [130.65, 49.25], [130.68, 49.18], [131.03, 49.03], [131.25, 48.5], [131.15, 48.25], [131.25, 48.0], [131.03, 47.47], [130.5, 47.25], [130.25, 47.35], [130.18, 47.32], [130.03, 46.97], [129.5, 46.75], [128.97, 46.97], [128.82, 47.32], [128.75, 47.35], [128.5, 47.25], [128.25, 47.35], [128.0, 47.25], [127.47, 47.47], [127.25, 48.0], [127.47, 48.53], [127.82, 48.68], [127.97, 49.03]]]]}, "2021-12-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[127.25, 48.0], [127.47, 48.53], [127.82, 48.68], [127.97, 49.03], [128.5, 49.25], [128.75, 49.15], [129.0, 49.25], [129.25, 49.15], [129.32, 49.18], [129.35, 49.25], [129.25, 49.5], [129.47, 50.03], [130.0, 50.25], [130.53, 50.03], [130.68, 49.68], [131.03, 49.53], [131.25, 49.0], [131.15, 48.75], [131.18, 48.68], [131.25, 48.65], [131.5, 48.75], [132.03, 48.53], [132.25, 48.0], [132.03, 47.47], [131.5, 47.25], [131.25, 47.35], [131.18, 47.32], [131.03, 46.97], [130.68, 46.82], [130.53, 46.47], [130.18, 46.32], [130.03, 45.97], [129.5, 45.75], [129.25, 45.85], [129.0, 45.75], [128.47, 45.97], [128.32, 46.32], [127.97, 46.47], [127.82, 46.82], [127.47, 46.97], [127.25, 47.5], [127.35, 47.75], [127.25, 48.0]]]]}, "2021-12-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[127.25, 48.0], [127.47, 48.53], [127.82, 48.68], [127.97, 49.03], [128.5, 49.25], [128.75, 49.15], [129.0, 49.25], [129.25, 49.15], [129.32, 49.18], [129.35, 49.25], [129.25, 49.5], [129.47, 50.03], [130.0, 50.25], [130.53, 50.03], [130.68, 49.68], [131.03, 49.53], [131.25, 49.0], [131.15, 48.75], [131.18, 48.68], [131.25, 48.65], [131.5, 48.75], [132.03, 48.53], [132.25, 48.0], [132.03, 47.47], [131.5, 47.25], [131.25, 47.35], [131.18, 47.32], [131.03, 46.97], [130.68, 46.82], [130.53, 46.47], [130.18, 46.32], [130.03, 45.97], [129.5, 45.75], [129.25, 45.85], [129.0, 45.75], [128.47, 45.97], [128.32, 46.32], [127.97, 46.47], [127.82, 46.82], [127.47, 46.97], [127.25, 47.5], [127.35, 47.75], [127.25, 48.0]]]]}, "2021-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[127.47, 46.97], [127.25, 47.5], [127.47, 48.03], [127.82, 48.18], [127.97, 48.53], [128.5, 48.75], [128.75, 48.65], [129.0, 48.75], [129.5, 48.54], [129.88, 48.7], [129.75, 49.0], [129.97, 49.53], [130.5, 49.75], [131.03, 49.53], [131.25, 49.0], [131.13, 48.7], [131.25, 48.65], [131.5, 48.75], [132.03, 48.53], [132.25, 48.0], [132.03, 47.47], [131.5, 47.25], [131.25, 47.35], [131.18, 47.32], [131.03, 46.97], [130.68, 46.82], [130.53, 46.47], [130.18, 46.32], [130.03, 45.97], [129.5, 45.75], [129.25, 45.85], [129.0, 45.75], [128.47, 45.97], [128.32, 46.32], [127.97, 46.47], [127.82, 46.82], [127.47, 46.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.041404829206954}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.158166869245633}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-27.85809653999894, -29.916112211028548, -27.060416925361864, -25.9830566361384]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-30.02312192166292, -33.606165138488194, -29.77568741993798, -28.992021125137313]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.595876849529164, -10.15236152410249, -7.3157899296658995, -6.875070250733625]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.059649763145899, -14.041404829206954, -10.267142539150939, -8.544931085901936]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7113113463912002, -2.2881966571804293, -1.6644393656220917, -1.5714688959421237]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.023018292003645, -3.1382813391932993, -2.0852629131567544, -1.9717924444832755]}}