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Climate Changes in Switzerland: Insight from the Last 300 Years

Learn about Swiss climate trends since 1700 including temperature, precipitation, and wind storms, using reconstructions and instrumental data. Key findings reveal unprecedented summer temperatures and shifting weather patterns.

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Climate Changes in Switzerland: Insight from the Last 300 Years

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  1. CH2018 Climatic changes in Switzerland over the last 300 years Stefan Brönnimann, OCCR/Inst. Geography, University of Bern Swiss Geoscience Meeting 2018

  2. CH2018 – Swiss Climate since 1700 Outline • Reconstructions • Temperature • Precipitation • Wind storms

  3. Instrumental Data CH2018 – Swiss Climate since 1700 Reconstruction methods

  4. Proxies CH2018 – Swiss Climate since 1700 Reconstruction methods

  5. Regression, Data Assimilation CH2018 – Swiss Climate since 1700 Reconstruction methods • Trachsel: Regression models • Bayesian framework for 30-yr uncertainty • Franke: Data Assimilation • Ensemble of 30 to determine uncertainty • 20th Centurry Reanylsis (ensemble of 56) for storms

  6. Annual series CH2018 – Swiss Climate since 1700 Summer temperature

  7. Summer temperature 30-yr moving average Far outside the rangeof the last 300 years CH2018 – Swiss Climate since 1700

  8. Inconclusive CH2018 – Swiss Climate since 1700 Summer precipitation

  9. Multidecadalvariability CH2018 – Swiss Climate since 1700 Winter wind storms

  10. CH2018 – Swiss Climate since 1700 Flood events • Atmospheric causes

  11. CH2018 – Swiss Climate since 1700 Everbody knew it all along

  12. CH2018 – Swiss Climate since 1700 Everbody knew it all along

  13. CH2018 – Swiss Climate since 1700 Conclusions • Unprecedented summer mean temperature • No cold summers anymore • Decadal variability of wind storms and flood events

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