Increasing large scale windstorm damage in Western, Central and Northern European forests, 1951-2010

Area of Science:

• Climatology
• Forestry Science
• Environmental Science

Background:

• Large-scale windstorms cause significant primary damage (PD) to European forests.
• Forest management and climate change are key factors influencing forest health and storm impacts.
• The North Atlantic Oscillation (NAO) is a major climate driver in the region.

Purpose of the Study:

• To analyze changes in European forest storm intensity using historical data.
• To identify potential shifts in storm behavior and their correlation with climate patterns.
• To assess the influence of climate change on North Atlantic storm impacts on forests.

Main Methods:

• Utilized a database of 276 primary damage (PD) reports from 1951-2010.
• Integrated total growing stock (TGS) statistics for European forests.
• Employed daily North Atlantic Oscillation (NAO) index data and statistical change-point analysis.

Main Results:

• A statistically significant change-point in storm intensity was identified in 1990 for Western, Central, and Northern Europe.
• The average intensity of destructive storms (PD/TGS > 0.08%) increased more than threefold after 1990.
• Seven catastrophic storms (PD/TGS > 0.2%) all occurred post-1990; seasonal storm impacts shifted from autumn to winter.

Conclusions:

• The year 1990 marks a significant shift in European storm intensity, indicating a potential real change in statistical behavior.
• Increased storm destructiveness and a shift towards winter storms suggest a growing impact of climate change on North Atlantic weather systems affecting Europe.
• These findings highlight the need for adaptive forest management strategies in response to evolving climate change impacts.