The article examines changes in the Convective Heat (CH) and Fire Danger Index (FFDI) across Australia from 1990 to 2009, using various modeling techniques including GCMs, CCAM, and WRF. It focuses on mid-afternoon values when dangerous fire conditions are most prevalent.
Key Findings:
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Current CH Conditions: Historical CH data shows significant regional variations, with higher values (>6) in northwest and central Australia and lower values (<4) near the coast. The ERA-Interim reanalysis provides consistent representations compared to the models.
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Extreme CH Values: Certain inland regions exceed CH >6 for over 200 days annually. Differences in modeling show that GCM and WRF results tend to underestimate CH in some areas.
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Future Projections: Projections indicate an increase in days with CH greater than its historical 95th percentile, especially under high emission scenarios. Increases are notable in southern and western regions, while decreases are forecasted for some northeastern areas, which are less prone to extreme fire events.
- FFDI Analysis: FFDI similarly shows regional variations, higher inland, and aligns with previous findings. Future projections indicate an increase in days with FFDI >25, contributing to fire management challenges.
Conclusion:
The study underscores a trend towards increased fire danger across Australia, emphasizing the importance of regional modeling to predict fire risks effectively.
