Institute for Atmospheric and Climate Science

Past climate variability from an upper-level perspective

Upcoming events

7 Events found:

  1. Mon 02. Mar. 2015 16:15 : ETH Zentrum, CAB G 11
    Dr. Anny Cazenave : Climate change and sea level rise
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  2. Mon 09. Mar. 2015 16:15 : ETH Zentrum, CAB G 11
    Prof. Thomas Koop : How ice crystals form (or not)
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  3. Wed 11. Mar. 2015 09:00 : ETH Zentrum, CHN L 17.1
    Dr. Dominik Renggli : From cyclone tracks to the costs of European winter storms: A probabilistic loss assessment model
    Special Event (Extraordinary Seminar) Abstract.pdf
    Details iCal
  4. Mon 16. Mar. 2015 16:15 : ETH Zentrum, CAB G 11
    Prof. Olivia Romppainen-Martius : High-impact weather in Switzerland - climatologies and processes
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  5. Tue 17. Mar. 2015 09:30 : ETH Zentrum, CHN L 17.1
    Prof. Ben Poulter : Toward an updated global wetland CH4 budget: progress, challenges and data needs
    Special Event (Extraordinary Seminar)
    Details iCal
  6. Mon 23. Mar. 2015 16:15 : ETH Zentrum, CAB G 11
    Prof. Joy Singarayer : Land use, climate change and climate engineering
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  7. Mon 30. Mar. 2015 16:15 : ETH Zentrum, CAB G 11
    Prof. Hayley Fowler : Understanding climate change impacts in the Karakoram Himalaya
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal



Das IAC bloggt auf dem ETH-Klimablog, der Informationsplattform der ETH Zürich zum Klimawandel. Mehr auf

The project aims at improving the current understanding of 20th century climate variability, which is a prerequisite for assessing and predicting current and future climate change. While climate variability during the second half of the 20th century has been studied extensively, relatively little is still known about the first half of the century, with its huge climatic variations such as the decade-long “Dust Bowl” droughts in the Midwest of the USA during the 1930s, the warming of the Arctic from 1920 to 1945, or the global climate anomalies in the 1940s. One reason for this is the lack of data above the Earth’s surface prior to 1948, inhibiting the understanding of large-scale dynamical processes. Upper-air data would allow addressing important dynamical features such as the position of the jet streams, the planetary wave structure, or the strength of the stratospheric polar vortex. Historical upper-air data, obtained with balloons and aircraft, can still be found today on paper in various meteorological archives. In the proposed project a large amount of these data, covering the 1925 to 1948 period, will be digitised and re-evaluated. The upper-air data will be used to construct upper-level meteorological fields back to the 1920s using statistical methods. In addition, historical total ozone data will be re-evaluated. With these novel data sets, combined with available climate model simulations, the key periods of early 20th century climate variability will be studied and the dynamical processes will be addressed in the upper-level fields. These analyses will provide new insights into the processes of large-scale climate coupling.


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