{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:56:39.681994", "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-Dec-27_to_2023-Dec-29_292.5_-59.5"}, "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": 2023120000513}, "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 27 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 29 2023"}, "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": 63547.39293855311}, "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": ["Antarctica"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Antarctica"]}, "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": ["Atlantic Ocean", "Southern Ocean"]}, "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": -59.5}, "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": 292.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "292.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 291.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 298.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -62.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -59.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-69.03, -60.47], [-68.5, -60.25], [-68.25, -60.35], [-68.12, -60.3], [-68.25, -60.0], [-68.15, -59.75], [-68.25, -59.5], [-68.03, -58.97], [-67.5, -58.75], [-67.25, -58.85], [-67.0, -58.75], [-66.75, -58.85], [-66.5, -58.75], [-65.97, -58.97], [-65.82, -59.32], [-65.5, -59.46], [-65.0, -59.25], [-64.75, -59.35], [-64.5, -59.25], [-64.25, -59.35], [-64.0, -59.25], [-63.75, -59.35], [-63.5, -59.25], [-63.25, -59.35], [-63.18, -59.32], [-63.03, -58.97], [-62.5, -58.75], [-62.25, -58.85], [-62.0, -58.75], [-61.47, -58.97], [-61.25, -59.5], [-61.47, -60.03], [-62.0, -60.25], [-62.25, -60.15], [-62.32, -60.18], [-62.47, -60.53], [-62.82, -60.68], [-62.97, -61.03], [-63.32, -61.18], [-63.47, -61.53], [-64.0, -61.75], [-64.25, -61.65], [-64.32, -61.68], [-64.47, -62.03], [-65.0, -62.25], [-65.25, -62.15], [-65.32, -62.18], [-65.47, -62.53], [-66.0, -62.75], [-66.25, -62.65], [-66.5, -62.75], [-66.75, -62.65], [-67.0, -62.75], [-67.25, -62.65], [-67.5, -62.75], [-67.75, -62.65], [-68.0, -62.75], [-68.53, -62.53], [-68.75, -62.0], [-68.62, -61.7], [-69.03, -61.53], [-69.25, -61.0], [-69.03, -60.47]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Antarctica", "Southern-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-69.02999999999997, -61.53], [-69.25, -61.0], [-69.02999999999997, -60.47], [-68.5, -60.25], [-68.25, -60.35], [-68.12, -60.3], [-68.25, -60.0], [-68.14999999999998, -59.75], [-68.25, -59.5], [-68.02999999999997, -58.97], [-67.5, -58.75], [-67.25, -58.85], [-67.0, -58.75], [-66.75, -58.85], [-66.5, -58.75], [-65.97000000000003, -58.97], [-65.82, -59.32], [-65.5, -59.46], [-65.0, -59.25], [-64.75, -59.35], [-64.5, -59.25], [-64.25, -59.35], [-64.0, -59.25], [-63.75, -59.35], [-63.5, -59.25], [-63.25, -59.35], [-63.18000000000001, -59.32], [-63.02999999999997, -58.97], [-62.5, -58.75], [-62.25, -58.85], [-62.0, -58.75], [-61.47000000000003, -58.97], [-61.25, -59.5], [-61.47000000000003, -60.03], [-62.0, -60.25], [-62.25, -60.15], [-62.31999999999999, -60.18], [-62.47000000000003, -60.53], [-62.81999999999999, -60.68], [-62.97000000000003, -61.03], [-63.31999999999999, -61.18], [-63.47000000000003, -61.53], [-64.0, -61.75], [-64.25, -61.65], [-64.32, -61.68], [-64.47000000000003, -62.03], [-65.0, -62.25], [-65.25, -62.15], [-65.32, -62.18], [-65.47000000000003, -62.53], [-66.0, -62.75], [-66.25, -62.65], [-66.5, -62.75], [-66.75, -62.65], [-67.0, -62.75], [-67.25, -62.65], [-67.5, -62.75], [-67.75, -62.65], [-68.0, -62.75], [-68.52999999999997, -62.53], [-68.75, -62.0], [-68.62, -61.7], [-69.02999999999997, -61.53]]]]}, "2023-12-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-69.02999999999997, -61.53], [-69.25, -61.0], [-69.02999999999997, -60.47], [-68.5, -60.25], [-68.25, -60.35], [-68.12, -60.3], [-68.25, -60.0], [-68.14999999999998, -59.75], [-68.25, -59.5], [-68.02999999999997, -58.97], [-67.5, 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[-68.0, -62.75], [-68.52999999999997, -62.53], [-68.75, -62.0], [-68.62, -61.7], [-69.02999999999997, -61.53]]]]}, "2023-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-69.02999999999997, -61.53], [-69.25, -61.0], [-69.02999999999997, -60.47], [-68.5, -60.25], [-68.25, -60.35], [-68.12, -60.3], [-68.25, -60.0], [-68.14999999999998, -59.75], [-68.25, -59.5], [-68.02999999999997, -58.97], [-67.5, -58.75], [-67.25, -58.85], [-67.0, -58.75], [-66.75, -58.85], [-66.5, -58.75], [-65.97000000000003, -58.97], [-65.82, -59.32], [-65.5, -59.46], [-65.0, -59.25], [-64.75, -59.35], [-64.5, -59.25], [-64.25, -59.35], [-64.0, -59.25], [-63.75, -59.35], [-63.5, -59.25], [-63.25, -59.35], [-63.18000000000001, -59.32], [-63.02999999999997, -58.97], [-62.5, -58.75], [-62.25, -58.85], [-62.0, -58.75], [-61.47000000000003, -58.97], [-61.25, -59.5], [-61.47000000000003, -60.03], [-62.0, -60.25], [-62.25, -60.15], [-62.31999999999999, -60.18], [-62.47000000000003, -60.53], [-62.81999999999999, -60.68], [-62.97000000000003, -61.03], [-63.31999999999999, -61.18], [-63.47000000000003, -61.53], [-64.0, -61.75], [-64.25, -61.65], [-64.32, -61.68], [-64.47000000000003, -62.03], [-65.0, -62.25], [-65.25, -62.15], [-65.32, -62.18], [-65.47000000000003, -62.53], [-66.0, -62.75], [-66.25, -62.65], [-66.5, -62.75], [-66.75, -62.65], [-67.0, -62.75], [-67.25, -62.65], [-67.5, -62.75], [-67.75, -62.65], [-68.0, -62.75], [-68.52999999999997, -62.53], [-68.75, -62.0], [-68.62, -61.7], [-69.02999999999997, -61.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.429707756915036}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.6121280188371092}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [0.7340253578328202, 0.7259451269354145, 0.8164765581049664]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [0.16585623353705614, 0.3182973952182806, 0.13617619017492189]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.61486640136624, -1.6458330691181349, -1.5756845860269528]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.093087390719461, -2.429707756915036, -1.909018978683946]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3451719100326898, -1.3705309382341948, -1.3651750130779519]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.542613254251089, -1.8049968739399092, -1.4875409020457149]}}