{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:51:50.551015", "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-Mar-28_to_2023-Mar-30_171.0_-43.5"}, "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": 2023030000911}, "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": "March 28 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 30 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": 80029.67513800225}, "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": ["New Zealand"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Oceania"]}, "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": -43.5}, "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": 171.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "171.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 168.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 173.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -46.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -42.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[168.75, -44.85], [168.82, -44.82], [168.85, -44.75], [168.75, -44.5], [168.97, -43.97], [169.32, -43.82], [169.35, -43.75], [169.25, -43.5], [169.47, -42.97], [170.0, -42.75], [170.25, -42.85], [170.32, -42.82], [170.35, -42.75], [170.25, -42.5], [170.47, -41.97], [171.0, -41.75], [171.25, -41.85], [171.32, -41.82], [171.47, -41.47], [172.0, -41.25], [172.53, -41.47], [172.68, -41.82], [172.75, -41.85], [172.82, -41.82], [172.97, -41.47], [173.5, -41.25], [174.03, -41.47], [174.25, -42.0], [174.03, -42.53], [173.68, -42.68], [173.53, -43.03], [173.18, -43.18], [173.15, -43.25], [173.25, -43.5], [173.03, -44.03], [172.5, -44.25], [172.25, -44.15], [172.18, -44.18], [172.03, -44.53], [171.68, -44.68], [171.53, -45.03], [171.18, -45.18], [171.15, -45.25], [171.25, -45.5], [171.03, -46.03], [170.5, -46.25], [170.25, -46.15], [170.0, -46.25], [169.75, -46.15], [169.68, -46.18], [169.53, -46.53], [169.0, -46.75], [168.75, -46.65], [168.5, -46.75], [168.25, -46.65], [168.0, -46.75], [167.47, -46.53], [167.25, -46.0], [167.47, -45.47], [167.82, -45.32], [167.97, -44.97], [168.5, -44.75], [168.75, -44.85]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["New-Zealand"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-03-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[167.97, -44.97], [168.5, -44.75], [168.75, -44.85], [168.82, -44.82], [168.85, -44.75], [168.75, -44.5], [168.97, -43.97], [169.32, -43.82], [169.35, -43.75], [169.25, -43.5], [169.47, -42.97], [170.0, -42.75], [170.25, -42.85], [170.32, -42.82], [170.35, -42.75], [170.25, -42.5], [170.47, -41.97], [171.0, -41.75], [171.25, -41.85], [171.32, -41.82], [171.47, -41.47], [172.0, -41.25], [172.53, -41.47], [172.68, -41.82], [172.75, -41.85], [172.82, -41.82], [172.97, -41.47], [173.5, -41.25], [174.03, -41.47], [174.25, -42.0], [174.03, -42.53], [173.68, -42.68], [173.53, -43.03], [173.18, -43.18], [173.15, -43.25], [173.25, -43.5], [173.03, -44.03], 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-11.396265095939555}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.741350833611126}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [2.6685148820067184, 3.77017319959009, 6.416368958828343]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-3.065009827702738, -1.5567340680739221, 1.2883540001355982]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.490375014780154, -7.26239670677964, -4.471280779273594]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-11.396265095939555, -9.732146666689914, -6.688014472196926]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-3.1149871339384405, -2.6959137345207127, -1.6772225078067855]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.9634551100875135, -3.5058113588844773, -2.3242237592177823]}}