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Changes in regional heatwave characteristics as a function of increasing global temperature.
S E Perkins-Kirkpatrick1,2, P B Gibson3,4
1Climate Change Research Centre, UNSW Australia, NSW, 2052, Australia. Sarah.kirkpatrick@unsw.edu.au.
Scientific Reports
|September 27, 2017
Summary
Global warming intensifies heatwaves. Expect more frequent, longer, and hotter heatwaves, especially in tropical regions, even with moderate warming. Limiting warming to 2°C is crucial to avoid severe impacts.
Area of Science:
- Climate Science
- Extreme Weather Events
- Global Warming Impacts
Background:
- The Paris Agreement aims to limit global warming to 1.5-2°C.
- Regional heatwave characteristics are projected to change with increasing global temperatures.
- Understanding these changes is vital for climate adaptation strategies.
Purpose of the Study:
- To investigate projected changes in regional heatwave intensity, frequency, and duration relative to global warming thresholds.
- To quantify the increase in heatwave days, intensity, and duration per degree Celsius of global warming.
- To analyze the influence of climate models and internal variability on heatwave projections.
Main Methods:
- Analysis of two climate model ensembles.
- Projection of heatwave characteristics (days, intensity, duration) against global warming levels.
- Assessment of changes in heatwave return intervals.
Main Results:
- 4-34 additional heatwave days per season are projected per °C of global warming.
- Heatwave intensity increases by 0.5-1.5°C, with higher increases in the Mediterranean and Central Asia.
- Intense heatwave return intervals decrease by 2-3 fold between 1.5°C and 2.5°C warming.
- Heatwave duration increases by 2-10 days/°C, particularly at lower latitudes.
- Climate model differences and internal variability influence regional heatwave change rates.
Conclusions:
- Global warming significantly exacerbates regional heatwave characteristics.
- Exceeding 2°C warming poses severe risks of disastrous heatwave consequences.
- Urgent global action is needed to mitigate climate change and its extreme weather impacts.
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