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Investigating Climate Extremes: Precipitation and Temperature Trends in Sweden and Europe

This research focuses on climate extremes, particularly temperature and precipitation, analyzing historical and future patterns in Sweden and Europe. Key topics include the connections between atmospheric circulation and climate extremes, the impacts of anthropogenic forces, and diurnal variations in precipitation. Current work involves quality assessment and spatiotemporal characteristics of precipitation data in a mountainous catchment in Honduras. Findings will enhance understanding of precipitation patterns and inform climate adaptation strategies.

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Investigating Climate Extremes: Precipitation and Temperature Trends in Sweden and Europe

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  1. Alexander Walther Physical GeographerPh.D. student climatology Acknowl. supervisors: Prof. Deliang Chen, Hans Linderholm

  2. Research topics • Climate extremes (Temperature and precipitation) in past/present/future • links to atmospheric circulation • the role played by anthropogenic forcings • Sweden and Europe

  3. Observations ... • precipitation • temperatures • daily • hourly • point measurements with some spatial autocorrelation ... and models • precipitation • temperatures • ... • daily, hourly, 10-min? • grid averages

  4. Diurnal variation in precipitation amount and frequency in Sweden • Current work • Precipitation data in a mountainous catchment in Honduras: quality assessment and spatiotemporal characteristicsWesterberg et al. (accepted) • Thermal Growing Season (GSL)Walther & Linderholm (2006), Linderholm et al. (2008), Song et al. (2009) • Trend Atlas of EMULATE extremesChen et al. (2006) • http://rcg.gvc.gu.se/data

  5. Diurnal variation in precipitation amount and frequency in Sweden

  6. observations model

  7. Spatial scale of extreme precipitation

  8. Cases [%] where interpolated rainfall matches observed rainfall

  9. Twentieth-century trends in the thermal growing season in the Greater Baltic Area GBA Average (1951-2000) -6.3 days +1.1 days +7.4 days Start End Length

  10. Trend atlas of the EMULATE indices (Chen et al., 2006) http://rcg.gvc.gu.se

  11. - - - - + + + + Tmin Tmax Tmin/Tmax indices. Fraction of positive, positive significant, negative, and negative significant trends for 1901-2000. The areas showing the highest fractions for each index and season are colored. percentiles cold warm cold warm cold

  12. - - - - + + + + Prec indices: Fraction of positive, positive significant, negative, and negative significant trends for 1901-2000. The areas showing the highest fractions for each index and season are colored.

  13. Ongoing and planned • atmospheric circulation mechanisms behind extreme precipitation events • When does it rain and why • How will precipitation patterns (extremes, diurnal cycle) evolve in the future • Do anthropogenic forcing plays a role

  14. Research topics • Climate extremes (Temperature and precipitation) in past/present/future • links to atmospheric circulation • the role played by anthropogenic forcings • Sweden and Europe

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