{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:17:52.741904", "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": "2020-Aug-18_to_2020-Aug-21_121.5_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": 2020080000643}, "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": "August 18 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 21 2020"}, "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": 203048.74665203787}, "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": ["Bohai 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": 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": 121.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "121.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 116.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 124.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[116.47, 39.53], [117.0, 39.75], [117.25, 39.646], [117.323, 39.677], [117.47, 40.03], [118.0, 40.25], [118.25, 40.146], [118.323, 40.177], [118.457, 40.5], [118.25, 41.0], [118.354, 41.25], [118.323, 41.323], [118.25, 41.354], [118.0, 41.25], [117.47, 41.47], [117.25, 42.0], [117.354, 42.25], [117.323, 42.323], [116.97, 42.47], [116.823, 42.823], [116.47, 42.97], [116.25, 43.5], [116.47, 44.03], [117.0, 44.25], [117.25, 44.146], [117.5, 44.25], [118.0, 44.043], [118.5, 44.25], [118.75, 44.146], [118.823, 44.177], [118.97, 44.53], [119.5, 44.75], [119.75, 44.646], [119.823, 44.677], [119.97, 45.03], [120.5, 45.25], [120.75, 45.146], [121.0, 45.25], [121.25, 45.146], [121.5, 45.25], [121.75, 45.146], [121.823, 45.177], [121.97, 45.53], [122.5, 45.75], [122.75, 45.646], [123.0, 45.75], [123.53, 45.53], [123.75, 45.0], [123.625, 44.698], [123.75, 44.646], [124.0, 44.75], [124.53, 44.53], [124.75, 44.0], [124.646, 43.75], [124.75, 43.5], [124.53, 42.97], [124.177, 42.823], [124.03, 42.47], [123.677, 42.323], [123.53, 41.97], [123.177, 41.823], [123.03, 41.47], [122.677, 41.323], [122.646, 41.25], [122.75, 41.0], [122.53, 40.47], [122.0, 40.25], [121.75, 40.354], [121.5, 40.25], [121.25, 40.354], [121.177, 40.323], [121.03, 39.97], [120.5, 39.75], [120.25, 39.854], [120.177, 39.823], [120.03, 39.47], [119.677, 39.323], [119.53, 38.97], [119.0, 38.75], [118.75, 38.854], [118.5, 38.75], [118.25, 38.854], [118.177, 38.823], [118.03, 38.47], [117.677, 38.323], [117.53, 37.97], [117.177, 37.823], [117.03, 37.47], [116.5, 37.25], [115.97, 37.47], [115.75, 38.0], [115.97, 38.53], [116.323, 38.677], [116.354, 38.75], [116.25, 39.0], [116.47, 39.53]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia", "E.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-08-18T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[116.82322330470336, 42.82322330470336], [116.46966991411009, 42.96966991411009], [116.25, 43.5], [116.46966991411009, 44.03033008588991], [117.0, 44.25], [117.25, 44.14644660940672], [117.5, 44.25], [118.0, 44.042893218813454], [118.5, 44.25], [118.75, 44.14644660940672], [119.0, 44.25], [119.53033008588991, 44.03033008588991], [119.75, 43.5], [119.64644660940672, 43.25], [119.75, 43.0], [119.64644660940672, 42.75], [119.75, 42.5], [119.53033008588991, 41.96966991411009], [119.17677669529664, 41.82322330470336], [119.03033008588991, 41.46966991411009], [118.5, 41.25], [118.25, 41.35355339059328], [118.0, 41.25], [117.46966991411009, 41.46966991411009], [117.25, 42.0], [117.35355339059328, 42.25], [117.32322330470336, 42.32322330470336], [116.96966991411009, 42.46966991411009], [116.82322330470336, 42.82322330470336]]]}, "2020-08-19T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[116.32322330470336, 38.67677669529664], [116.35355339059328, 38.75], [116.25, 39.0], [116.46966991411009, 39.53033008588991], [117.0, 39.75], [117.25, 39.64644660940672], [117.32322330470336, 39.67677669529664], [117.46966991411009, 40.03033008588991], [118.0, 40.25], [118.25, 40.14644660940672], [118.32322330470336, 40.17677669529664], [118.45710678118654, 40.5], [118.25, 41.0], [118.35355339059328, 41.25], [118.32322330470336, 41.32322330470336], [118.25, 41.35355339059328], [118.0, 41.25], [117.46966991411009, 41.46966991411009], [117.25, 42.0], [117.35355339059328, 42.25], [117.32322330470336, 42.32322330470336], [116.96966991411009, 42.46966991411009], [116.82322330470336, 42.82322330470336], [116.46966991411009, 42.96966991411009], [116.25, 43.5], [116.46966991411009, 44.03033008588991], [117.0, 44.25], [117.25, 44.14644660940672], [117.5, 44.25], [118.0, 44.042893218813454], [118.5, 44.25], [118.75, 44.14644660940672], [118.82322330470336, 44.17677669529664], [118.96966991411009, 44.53033008588991], [119.5, 44.75], [119.75, 44.64644660940672], [119.82322330470336, 44.67677669529664], [119.96966991411009, 45.03033008588991], [120.5, 45.25], [120.75, 45.14644660940672], [121.0, 45.25], [121.25, 45.14644660940672], [121.5, 45.25], [121.75, 45.14644660940672], [121.82322330470336, 45.17677669529664], [121.96966991411009, 45.53033008588991], [122.5, 45.75], [122.75, 45.64644660940672], [123.0, 45.75], [123.53033008588991, 45.53033008588991], [123.75, 45.0], [123.625, 44.69822330470336], [123.75, 44.64644660940672], [124.0, 44.75], [124.53033008588991, 44.53033008588991], [124.75, 44.0], [124.64644660940672, 43.75], [124.75, 43.5], [124.53033008588991, 42.96966991411009], [124.17677669529664, 42.82322330470336], [124.03033008588991, 42.46966991411009], [123.67677669529664, 42.32322330470336], [123.53033008588991, 41.96966991411009], [123.17677669529664, 41.82322330470336], [123.03033008588991, 41.46966991411009], [122.67677669529664, 41.32322330470336], [122.64644660940672, 41.25], [122.75, 41.0], [122.53033008588991, 40.46966991411009], [122.0, 40.25], [121.75, 40.35355339059328], [121.5, 40.25], [121.25, 40.35355339059328], [121.17677669529664, 40.32322330470336], [121.03033008588991, 39.96966991411009], [120.5, 39.75], [120.25, 39.85355339059328], [120.17677669529664, 39.82322330470336], [120.03033008588991, 39.46966991411009], [119.67677669529664, 39.32322330470336], [119.53033008588991, 38.96966991411009], [119.0, 38.75], [118.75, 38.85355339059328], [118.5, 38.75], [118.25, 38.85355339059328], [118.17677669529664, 38.82322330470336], [118.03033008588991, 38.46966991411009], [117.67677669529664, 38.32322330470336], [117.53033008588991, 37.96966991411009], [117.17677669529664, 37.82322330470336], [117.03033008588991, 37.46966991411009], [116.5, 37.25], [115.96966991411009, 37.46966991411009], [115.75, 38.0], [115.96966991411009, 38.53033008588991], [116.32322330470336, 38.67677669529664]]]}, "2020-08-20T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[116.32322330470336, 38.67677669529664], [116.35355339059328, 38.75], [116.25, 39.0], [116.46966991411009, 39.53033008588991], [117.0, 39.75], [117.25, 39.64644660940672], [117.32322330470336, 39.67677669529664], [117.46966991411009, 40.03033008588991], [118.0, 40.25], [118.25, 40.14644660940672], [118.32322330470336, 40.17677669529664], [118.45710678118654, 40.5], [118.25, 41.0], [118.35355339059328, 41.25], [118.32322330470336, 41.32322330470336], [118.25, 41.35355339059328], [118.0, 41.25], [117.46966991411009, 41.46966991411009], [117.25, 42.0], [117.35355339059328, 42.25], [117.32322330470336, 42.32322330470336], [116.96966991411009, 42.46966991411009], [116.82322330470336, 42.82322330470336], [116.46966991411009, 42.96966991411009], [116.25, 43.5], [116.46966991411009, 44.03033008588991], [117.0, 44.25], [117.25, 44.14644660940672], [117.5, 44.25], [118.0, 44.042893218813454], [118.5, 44.25], [118.75, 44.14644660940672], [118.82322330470336, 44.17677669529664], [118.96966991411009, 44.53033008588991], [119.5, 44.75], [119.75, 44.64644660940672], [119.82322330470336, 44.67677669529664], [119.96966991411009, 45.03033008588991], [120.5, 45.25], [120.75, 45.14644660940672], [121.0, 45.25], [121.25, 45.14644660940672], [121.5, 45.25], [121.75, 45.14644660940672], [121.82322330470336, 45.17677669529664], [121.96966991411009, 45.53033008588991], [122.5, 45.75], [122.75, 45.64644660940672], [123.0, 45.75], [123.53033008588991, 45.53033008588991], [123.75, 45.0], [123.625, 44.69822330470336], [123.75, 44.64644660940672], [124.0, 44.75], [124.53033008588991, 44.53033008588991], [124.75, 44.0], [124.64644660940672, 43.75], [124.75, 43.5], [124.53033008588991, 42.96966991411009], [124.17677669529664, 42.82322330470336], [124.03033008588991, 42.46966991411009], [123.67677669529664, 42.32322330470336], [123.53033008588991, 41.96966991411009], [123.17677669529664, 41.82322330470336], [123.03033008588991, 41.46966991411009], [122.67677669529664, 41.32322330470336], [122.64644660940672, 41.25], [122.75, 41.0], [122.53033008588991, 40.46966991411009], [122.0, 40.25], [121.75, 40.35355339059328], [121.5, 40.25], [121.25, 40.35355339059328], [121.17677669529664, 40.32322330470336], [121.03033008588991, 39.96966991411009], [120.5, 39.75], [120.25, 39.85355339059328], [120.17677669529664, 39.82322330470336], [120.03033008588991, 39.46966991411009], [119.67677669529664, 39.32322330470336], [119.53033008588991, 38.96966991411009], [119.0, 38.75], [118.75, 38.85355339059328], [118.5, 38.75], [118.25, 38.85355339059328], [118.17677669529664, 38.82322330470336], [118.03033008588991, 38.46966991411009], [117.67677669529664, 38.32322330470336], [117.53033008588991, 37.96966991411009], [117.17677669529664, 37.82322330470336], [117.03033008588991, 37.46966991411009], [116.5, 37.25], [115.96966991411009, 37.46966991411009], [115.75, 38.0], [115.96966991411009, 38.53033008588991], [116.32322330470336, 38.67677669529664]]]}, "2020-08-21T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[116.32322330470336, 38.67677669529664], [116.35355339059328, 38.75], [116.25, 39.0], [116.46966991411009, 39.53033008588991], [117.0, 39.75], [117.25, 39.64644660940672], [117.32322330470336, 39.67677669529664], [117.46966991411009, 40.03033008588991], [118.0, 40.25], [118.25, 40.14644660940672], [118.32322330470336, 40.17677669529664], [118.45710678118654, 40.5], [118.25, 41.0], [118.35355339059328, 41.25], [118.25, 41.5], [118.35355339059328, 41.75], [118.25, 42.0], [118.35355339059328, 42.25], [118.25, 42.5], [118.35355339059328, 42.75], [118.32322330470336, 42.82322330470336], [117.96966991411009, 42.96966991411009], [117.75, 43.5], [117.96966991411009, 44.03033008588991], [118.5, 44.25], [118.75, 44.14644660940672], [118.82322330470336, 44.17677669529664], [118.96966991411009, 44.53033008588991], [119.5, 44.75], [119.75, 44.64644660940672], [119.82322330470336, 44.67677669529664], [119.96966991411009, 45.03033008588991], [120.5, 45.25], [120.75, 45.14644660940672], [121.0, 45.25], [121.25, 45.14644660940672], [121.5, 45.25], [121.75, 45.14644660940672], [121.82322330470336, 45.17677669529664], [121.96966991411009, 45.53033008588991], [122.5, 45.75], [122.75, 45.64644660940672], [123.0, 45.75], [123.53033008588991, 45.53033008588991], [123.75, 45.0], [123.625, 44.69822330470336], [123.75, 44.64644660940672], [124.0, 44.75], [124.53033008588991, 44.53033008588991], [124.75, 44.0], [124.64644660940672, 43.75], [124.75, 43.5], [124.53033008588991, 42.96966991411009], [124.17677669529664, 42.82322330470336], [124.03033008588991, 42.46966991411009], [123.67677669529664, 42.32322330470336], [123.53033008588991, 41.96966991411009], [123.17677669529664, 41.82322330470336], [123.03033008588991, 41.46966991411009], [122.67677669529664, 41.32322330470336], [122.64644660940672, 41.25], [122.75, 41.0], [122.53033008588991, 40.46966991411009], [122.0, 40.25], [121.75, 40.35355339059328], [121.5, 40.25], [121.25, 40.35355339059328], [121.17677669529664, 40.32322330470336], [121.03033008588991, 39.96966991411009], [120.5, 39.75], [120.25, 39.85355339059328], [120.17677669529664, 39.82322330470336], [120.03033008588991, 39.46966991411009], [119.67677669529664, 39.32322330470336], [119.53033008588991, 38.96966991411009], [119.0, 38.75], [118.75, 38.85355339059328], [118.5, 38.75], [118.25, 38.85355339059328], [118.17677669529664, 38.82322330470336], [118.03033008588991, 38.46966991411009], [117.67677669529664, 38.32322330470336], [117.53033008588991, 37.96966991411009], [117.17677669529664, 37.82322330470336], [117.03033008588991, 37.46966991411009], [116.5, 37.25], [115.96966991411009, 37.46966991411009], [115.75, 38.0], [115.96966991411009, 38.53033008588991], [116.32322330470336, 38.67677669529664]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.29673136424725}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.309872966415417}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.37507200768141, 17.674396282306702, 17.421768252059337, 18.896422127639426]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [12.721546149047072, 12.22696407979521, 11.939458743608157, 16.39425908668369]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.7313124573963967, -4.564722153579185, -4.748017228632694, -3.6329338366946002]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.225376490580288, -5.804559177898398, -6.29673136424725, -5.33384816552126]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.420071188176398, -1.9683858903293494, -2.105179226297584, -1.648244365036594]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5823879630902222, -2.669317575800353, -2.582145120606424, -2.2562126990878846]}}