Regional Climate Group 1 Department of Earth Sciences.

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Presentation transcript:

Regional Climate Group 1 Department of Earth Sciences

Regional Climate Group 2 Department of Earth Sciences Alexander Walther Physical Geographer Ph.D. student climatology Acknowl. supervisors: Prof. Deliang Chen, Hans Linderholm

Regional Climate Group 3 Department of Earth Sciences Research topics  Climate extremes (Temperature and precipitation) in past/present/future  links to atmospheric circulation  the role played by anthropogenic forcings  Sweden and Europe

Regional Climate Group 4 Department of Earth Sciences Observations... - precipitation - temperatures - daily - hourly - point measurements with some spatial autocorrelation... and models - precipitation - temperatures daily, hourly, 10-min? - grid averages

Regional Climate Group 5 Department of Earth Sciences Diurnal variation in precipitation amount and frequency in Sweden Current work Precipitation data in a mountainous catchment in Honduras: quality assessment and spatiotemporal characteristics Westerberg et al. (accepted) Thermal Growing Season (GSL) Walther & Linderholm (2006), Linderholm et al. (2008), Song et al. (2009) Trend Atlas of EMULATE extremes Chen et al. (2006)

Regional Climate Group 6 Department of Earth Sciences Diurnal variation in precipitation amount and frequency in Sweden

Regional Climate Group 7 Department of Earth Sciences observationsmodel

Regional Climate Group 8 Department of Earth Sciences Spatial scale of extreme precipitation

Regional Climate Group 9 Department of Earth Sciences GCM44km22km min # of stations Prec mm mm mm mm mm Cases [%] where interpolated rainfall matches observed rainfall

Regional Climate Group 10 Department of Earth Sciences Twentieth-century trends in the thermal growing season in the Greater Baltic Area Start End Length GBA Average ( ) -6.3 days +1.1 days +7.4 days

Regional Climate Group 11 Department of Earth Sciences Trend atlas of the EMULATE indices (Chen et al., 2006)

Regional Climate Group 12 Department of Earth Sciences Tmin Tmax Tmin/Tmax indices. Fraction of positive, positive significant, negative, and negative significant trends for The areas showing the highest fractions for each index and season are colored percentiles cold warm cold warm cold

Regional Climate Group 13 Department of Earth Sciences Prec indices: Fraction of positive, positive significant, negative, and negative significant trends for The areas showing the highest fractions for each index and season are colored

Regional Climate Group 14 Department of Earth Sciences 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

Regional Climate Group 15 Department of Earth Sciences Research topics  Climate extremes (Temperature and precipitation) in past/present/future  links to atmospheric circulation  the role played by anthropogenic forcings  Sweden and Europe

Regional Climate Group 16 Department of Earth Sciences