Les évènements météorologiques extrêmes et le changement climatique

The document explains the science of extreme event attribution, detailing how researchers use climate models and historical data to determine if climate change made a specific event more likely or intense. It provides specific guidance on reporting various phenomena—heatwaves, floods, tropical cyclones, snowfall, droughts, and wildfires—highlighting where scientific confidence is high and where uncertainties remain.

• Extreme event attribution uses three primary methodological layers: simulating current and pre-industrial climates using models, analyzing historical meteorological observations to identify probability shifts, and simulating climate from a historical date (e.g., 1900) to the present to detect extreme trends.
• There is an extremely robust global link between climate change and heatwaves; every heatwave is now stronger and more likely to occur. A 1°C increase in global temperature increases heatwaves by more than 1°C.
• Extreme precipitation has become more frequent and intense in most global regions due to human-induced climate change, driven partly by the Clausius-Clapeyron relation where air that is 1°C warmer holds 7% more moisture.
• While the total number of tropical cyclones globally has not changed, climate change has increased the frequency of the most intense and destructive storms (Categories 3 to 5 on the Saffir-Simpson scale) and increased their associated precipitation and storm surges.
• The impact of climate change on droughts is regionally variable; it increases frequency and severity in the Mediterranean, Southern Africa, Central and East Asia, Southern Australia, and Western North America, but remains uncertain in other regions.
• Climate change has increased the probability of conditions conducive to wildfires across all continents, with high confidence in Southern Europe, Northern Eurasia, the United States, and Australia.
• Extreme cold events have decreased in probability and intensity worldwide, although the specific evolution of heavy snowfall remains unclear in most places, with potential intensity increases only in parts of North America, East and North Asia, and Greenland.

APA

Clarke, B., & Otto, F. (n.d.). Les évènements météorologiques extrêmes et le changement climatique. World Weather Attribution. https://www.worldweatherattribution.org/wp-content/uploads/FR_WWA-Les-evenements-meteorologiques-extremes-et-le-changement-climatique.pdf

Chicago

Clarke, Ben, and Friederike Otto. Les évènements météorologiques extrêmes et le changement climatique. World Weather Attribution, n.d. https://www.worldweatherattribution.org/wp-content/uploads/FR_WWA-Les-evenements-meteorologiques-extremes-et-le-changement-climatique.pdf.

Wikipedia

{{cite report |last1=Clarke |first1=Ben |last2=Otto |first2=Friederike |title=Les évènements météorologiques extrêmes et le changement climatique |publisher=World Weather Attribution |url=https://www.worldweatherattribution.org/wp-content/uploads/FR_WWA-Les-evenements-meteorologiques-extremes-et-le-changement-climatique.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{clarkendles, author = {Clarke, Ben and Otto, Friederike}, title = {{Les évènements météorologiques extrêmes et le changement climatique}}, institution = {World Weather Attribution}, url = {https://www.worldweatherattribution.org/wp-content/uploads/FR_WWA-Les-evenements-meteorologiques-extremes-et-le-changement-climatique.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }