WATCH Technical Report Number 8: International Summer School on Hydrological Drought and Global Change Objectives, procedure of the selection of candidates and the programme of the International Summer School on Hydrological Drought and Global Change (Trieste, Italy, 22-27 June 2008) are summarized. The report has a comprehensive set of annexes (e.g. flyer, application form, list of lecturers, list of participants, detailed programme of summer school and handouts for parallel workshops, title of contributions from participants, questionnaire, certificate) which might be useful for following courses. The evaluation of the summer school, which is based upon an extended questionnaire (86% response), covers the major part of the report. The vast majority of the participants was very happy with the summer school. About 90% of the students classified it as good to excellent.
Henny A.J. van Lanen, Lena M. Tallaksen, Claudio Piani & Pandora Pieri, October 28, 2008
WATCH Technical Report Number 7: Analysis of existing climate model results over Europe DMI has studied a methodology for assessing the skill of an RCM in describing the full distribution of intensities of a variable such as precipitation, and the projected change in the distributions for the A2 climate scenario. The method used is based on that presented by Perkins et al. (2007), and calculates the overlap of two normalized precipitation intensity spectra. The skill of the PRUDENCE RCMs in
comparison to the ECA observational data set (Klein Tank et al., 2002) was calculated and it was shown that all of the models matched the observations by about 80—90%. Some models always perform in the higher range and some always in the lower.
Stefan Hagemann (MPI-M), Peter Berg (DMI), Jens H. Christensen (DMI), Jan Härter (MPI-M), September 11, 2008
WATCH Technical Report Number 4: Database with hydrometeorological variables for selected river basins: metadata catalogue Information is provided on available data for selected river basins in Europe (i.e. Glomma, Norway; Nitra, Slovakia; Upper-Elbe, Czech Republic; Upper-Guadiana, Spain; Thames, United Kingdom). The river basins differ in climate and physical basin structure. Information is given for the whole basin and for one or two sub-basins (focal areas). The river basins play a key role in the validation of large-scale models. Observed hydro-meteorological variables in the selected river basins, which are complemented with simulation results from detailed River Basin Hydrological Models, will be used to evaluate the ability of large-scale models to satisfactory represent hydrological processes that control the propagation of drought (from meteorological droughts to hydrological droughts) and the generation of large-scale floods.
Henny A.J. van Lanen, Lena M. Tallaksen, Miguel Candel, Jesus Carrera, Sue Crooks, Kolbjørn Engeland, Miriam Fendeková, Ingjerd Haddeland, Hege Hisdal, Stanislav Horacek, Jorge Jódar Bermúdez, Anne F. van Loon, Andrej Machlica, Vicente Navarro, Oldřich Novický & Christel Prudhomme, August 19, 2008
WATCH Technical Report Number 3: Uncertainty in water budgets of the 20th century due to representation of impact of CO2 enrichment There is an ongoing debate about the potential effects that increasing atmospheric CO2 concentration already had on the global water cycle and on river discharge in particular. To contribute to this debate, one applied the global vegetation and hydrology model LPJmL for quantifying the individual contribution of risen CO2 concentration relative to the contributions of changing precipitation, temperature, land use and irrigation to worldwide trends in river discharge (Q) over the past century. The results have been put together in a concise scientific paper, but a a brief summary of the study is provided in this report.
Dieter Gerten (PIK), Nicola Gedney (UK Met Office), August 18, 2008