Heat hazard data for the National Climate Risk Assessment

Heat hazard regional change summaries for the National Climate Risk Assessment (NCRA). The heat hazards have been summarised for boundaries relating to the assessment of freshwater and terrestrial natural environments.

Australian Climate Service (ACS) heat hazard datasets (https://github.com/AusClimateService/hazards-heat)
1. TXx - the hottest day of the year
2. TXm - annual mean daily maximum temperature
3. HWF - heatwave frequency

Each hazard dataset includes an ensemble of climate models for four global warming levels (GWLs), 1.2, 1.5, 2.0 and 3.0 degrees Celsius, above a pre-industrial mean for 1850 to 1900.

Either the absolute change (difference to GWL1.2) or the relative change (difference to GWL1.2 divided by GWL1.2) was calculated for each of the higher GWLs compared to GWL1.2.

Regions of interest boundaries
1. Australia
2. NCRA regions
3. Aggregate Ecological Groups (AEGs)
4. Combined NCRA regions and AEGs
5. Level 2 drainage basins from the Australian Hydrological Geospatial Fabric (AHGF)
6. Spatially combined AHGF Level 2 drainage basins and hazard dataset grid cells which intersect with perennial drainage lines from the AHGF Network Streams
7. Spatially combined AHGF Level 2 drainage basins and hazard dataset grid cells which intersect with ephemeral drainage lines from AHGF Network Streams

For each hazard/GWL-change combination, a set of statistics (the mean, 10th percentile, 50th percentile, 90th percentile and standard deviation) was calculated for each climate model in the ensemble over the regions of interest areas. From these, the median of each statistic from all the models in the ensemble was calculated.

Collection data files
The outputs are tabular data in comma-separated value (csv) files with one file per hazard/GWL-change combination. The columns are ID and region name that link to the boundary datasets for visualising in GIS software, and the medians of the statistics. Rows are the individual region of interest polygons.