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Climate Changes in Switzerland: Insight from the Last 300 Years

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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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