@misc{WalterKeulerBlocketal., author = {Walter, Andreas and Keuler, Klaus and Block, Alexander and Knoche, Richard and Block, Alexander and Kotlarski, Sven and M{\"u}ller-Westermeier, Gerhard and Rechid, Diana and Ahrens, Wilfried}, title = {A high resolution reference data set of german wind velocity 1951-2001 and comparison with regional climate model results}, series = {Meteorologische Zeitschrift}, volume = {15}, journal = {Meteorologische Zeitschrift}, number = {6}, issn = {1610-1227}, doi = {10.1127/0941-2948/2006/0162}, pages = {585 -- 596}, language = {en} } @phdthesis{Block, author = {Block, Alexander}, title = {Unsicherheiten in Oberfl{\"a}chen- und Bodenparametern und ihre Auswirkungen auf die Ergebnisse regionaler Klimasimulationen}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-3636}, language = {de} } @misc{KotlarskiBlockBoehmetal., author = {Kotlarski, Sven and Block, Alexander and B{\"o}hm, Ursula and Jacob, Daniela and Keuler, Klaus and Knoche, Richard and Rechid, Diana and Walter, Artur}, title = {Regional Climate Model Simulations as Input for Hydrological Applications: Evaluation of Uncertainties}, series = {Advances in Geoscience}, journal = {Advances in Geoscience}, number = {5}, doi = {10.5194/adgeo-5-119-2005}, pages = {119 -- 125}, language = {en} } @techreport{WillKeulerBlock, author = {Will, Andreas and Keuler, Klaus and Block, Alexander}, title = {The Climate Local Model - Evaluation Results and Recent Developments}, number = {8}, publisher = {TerraFLOPS}, pages = {2 -- 3}, abstract = {A successful and overall evaluation of the CLM was a prerequisite for conduction of the consortial runs, which will be the data basis of the BMBF research program "Research for the climate protection and protection from climate impact". We present selected results showing the quality of the model and discuss open questions in regional climate modelling, which may be further addressed using the results of the consortial runs.}, language = {en} } @techreport{BoehmKueckenAhrensetal., author = {B{\"o}hm, Uwe and K{\"u}cken, Martin and Ahrens, Wilfried and Block, Alexander and Hauffe, Detlef and Keuler, Klaus and Rockel, Burkhardt and Will, Andreas}, title = {CLM - The Climate Version of LM: Brief Description and Long-Term Applications}, publisher = {COSMO Newsletter}, address = {Offenbach, Germany}, pages = {11}, language = {en} } @techreport{KeulerBlockAhrensetal., author = {Keuler, Klaus and Block, Alexander and Ahrens, Wilfried and Jacob, Daniela and Rechid, Diana and Kotova, Lola and Kotlarski, Sven and Heimann, Dietrich and Zemsch, Maria and Knoche, Richard and Dittmann, Ernst and Walter, Andreas and Berger, Franz and Sommer, Michael}, title = {QUIRCS: Quantification of uncertainties in regional climate and climate change simulations. German Climate Research Programme (2001-2006), Final Symposium 2005}, publisher = {DLR}, address = {Bonn}, pages = {9}, abstract = {The comparison of multi model runs of the reference period 1979-1993 with different observational data sets for several climate parameters enables the quantification of the model uncertainties in representing present-day climate conditions for Central Europe. The quantification is based on a number of objective distance measures which detect differences in the spatial and temporal structures of the data sets being compared. Additional climate change simulations of two 30-year periods (control and scenario simulation) are performed for the SRES B2 global change scenario. They indicate a severe warming for Germany with values of up to 4 K in summer which is much higher than the quantified uncertainty range of the regional models for this climate parameter. For precipitation in Germany, a weak reduction during the summer months is overcompensated by an increase in winter and fall. However, the simulated changes are smaller than the quantified uncertainty range for the regional models so that in particular a significant reduction of the annual precipitation in Germany cannot be stated on basis of the current simulations for the B2 scenario. Aim of the research in the context of DEKLIM A reliable assessment of possible future climate developments requires an improved understanding of climate and its variability as well as a detailed knowledge of the uncertainties of climate simulations which provide the requested information about the potential degree of future changes. The project QUIRCS focuses on the climate patterns of Central Europe and investigates the quality of currently used regional climate models and regionalization techniques by a model inter-comparison, a substantial model evaluation, additional sensitivity studies and an extensive analysis of climate data. The major scientific aims are • to quantify the uncertainties of regional climate simulations and of observed climate data, • to provide a regional climate change scenario for Europe with a particular focus on Germany, • to assess the reliability of the produced climate change signals with respect to the Collapse.}, language = {en} } @techreport{KeulerBlockAhrensetal., author = {Keuler, Klaus and Block, Alexander and Ahrens, Wilfried and Jacob, Daniela and Rechid, Diana and Kotova, Lola and Kotlarski, Sven and Heimann, Dietrich and Zemsch, Maria and Knoche, Richard and Dittmann, Ernst and Walter, Andreas and Berger, Franz and Sommer, Michael}, title = {Quantifizierung von Ungenauigkeiten regionaler Klima- und Klima{\"a}nderungssimulationen (QUIRCS). Zusammenfassung der wesentlichen Ergebnisse eines Projektes des deutschen Klimaforschungsprogramms DEKLIM}, pages = {153}, abstract = {Das Projekt QUIRCS ("Quantification of Uncertainties in Regional Climate and Climate-Change Simulations") ist eines von insgesamt37Verbundforschungsprojekten, die im Rahmen des Deutschen Klimaforschungsprogramms DEKLIM vom BMBF als Beitrag zum Teilbereich „Klima-forschung und Vorhersagbarkeit" gef{\"o}rdert worden sind [DEKLIM, 2005]. Unter der Koordination des Lehrstuhls Umweltmeteorologie der Brandenburgischen Technischen Universit{\"a}t (BTU) Cottbus waren 6 Institutionen mit insgesamt 13 Mitarbeitern {\"u}ber 4 Jahre an der Durchf{\"u}hrung des Projektes beteiligt. Der vorliegende Bericht gibt einen {\"U}berblick {\"u}ber die verschiedenen Aufgabenstellungen und fasst die wesentlichen Ergebnisse des Projektes zusammen.}, language = {de} } @inproceedings{KeulerBlock, author = {Keuler, Klaus and Block, Alexander}, title = {High resolution climate change simulation for Central Europe}, series = {Extended abstracts of a WMO/WCRP-sponsored Regional-Scale Climate Modelling Workshop, high-resolution climate modelling, assessment, added value and applications, Lund, Sweden, 29 March-2 April 2004}, booktitle = {Extended abstracts of a WMO/WCRP-sponsored Regional-Scale Climate Modelling Workshop, high-resolution climate modelling, assessment, added value and applications, Lund, Sweden, 29 March-2 April 2004}, editor = {B{\"a}rring, Lars and Laprise, Rene}, publisher = {Lund University}, address = {Lund, Sweden}, pages = {106 -- 107}, language = {en} } @inproceedings{KeulerBlockSchaller, author = {Keuler, Klaus and Block, Alexander and Schaller, Eberhard}, title = {Assessment of quality and uncertainty in regional climate simulations}, series = {Extended abstracts of a WMO/WCRP-sponsored Regional-Scale Climate Modelling Workshop, high-resolution climate modelling, assessment, added value and applications, Lund, Sweden, 29 March-2 April 2004}, booktitle = {Extended abstracts of a WMO/WCRP-sponsored Regional-Scale Climate Modelling Workshop, high-resolution climate modelling, assessment, added value and applications, Lund, Sweden, 29 March-2 April 2004}, editor = {B{\"a}rring, Lars and Laprise, Rene}, publisher = {Lund University}, address = {Lund, Sweden}, pages = {68 -- 69}, language = {en} } @misc{BoehmKueckenHauffeetal., author = {B{\"o}hm, Uwe and K{\"u}cken, Martin and Hauffe, Detlef and Gerstengarbe, F.-W. and Werner, P. C. and Flechsig, Michael and Keuler, Klaus and Block, Alexander and Ahrens, Wilfried and Nocke, Th.}, title = {Reliability of regional climate model simulations of extremes and of long-term climate}, series = {Natural Hazards and Earth System Sciences}, volume = {4}, journal = {Natural Hazards and Earth System Sciences}, number = {3}, doi = {10.5194/nhess-4-417-2004}, pages = {417 -- 431}, abstract = {We present two case studies that demonstrate how a common evaluation methodology can be used to assess the reliability of regional climate model simulations from different fields of research. In Case I, we focused on the agricultural yield loss risk for maize in Northeastern Brazil during a drought linked to an El-Ni{\~n}o event. In Case II, the present-day regional climatic conditions in Europe for a 10-year period are simulated. To comprehensively evaluate the model results for both kinds of investigations, we developed a general methodology. On its basis, we elaborated and implemented modules to assess the quality of model results using both advanced visualization techniques and statistical algorithms. Besides univariate approaches for individual near-surface parameters, we used multivariate statistics to investigate multiple near-surface parameters of interest together. For the latter case, we defined generalized quality measures to quantify the model's accuracy. Furthermore, we elaborated a diagnosis tool applicable for atmospheric variables to assess the model's accuracy in representing the physical processes above the surface under various aspects. By means of this evaluation approach, it could be demonstrated in Case Study I that the accuracy of the applied regional climate model resides at the same level as that we found for another regional model and a global model. Excessive precipitation during the rainy season in coastal regions could be identified as a major contribution leading to this result. In Case Study II, we also identified the accuracy of the investigated mean characteristics for near-surface temperature and precipitation to be comparable to another regional model. In this case, an artificial modulation of the used initial and boundary data during preprocessing could be identified as the major source of error in the simulation. Altogether, the achieved results for the presented investigations indicate the potential of our methodology to be applied as a common test bed to different fields of research in regional climate modeling.}, language = {en} } @misc{BlockKeulerSchaller, author = {Block, Alexander and Keuler, Klaus and Schaller, Eberhard}, title = {Impacts of anthropogenic heat on regional climate patterns}, series = {Geophysical Research Letters}, volume = {31}, journal = {Geophysical Research Letters}, number = {12}, doi = {10.1029/2004GL019852}, pages = {4}, abstract = {[1] Four different simulations of a winter period in Central Europe are carried out to investigate the principle effect of anthropogenic heat release from the highly industrialized and populated Ruhrarea region (Germany) on regional climate conditions. The results reveal a permanent warming due to anthropogenic heat emissions over affected areas ranging from 0.15 K over land area with an additional 2 W m-2 anthropogenic heat flux up to 0.5 K over the Ruhrarea with additional 20 W m-2 anthropogenic heat flux. The temperature effects induced by anthropogenic heat not only depend on the amount of added heat but also on orographical factors. No significant variations are found for precipitation.}, language = {en} } @misc{BoehmKueckenAhrensetal., author = {B{\"o}hm, Uwe and K{\"u}cken, Martin and Ahrens, Wilfried and Block, Alexander and Hauffe, Detlef and Keuler, Klaus and Rockel, Burkhardt and Will, Andreas}, title = {The Climate Version of LM: Brief Description and Long-Term Applications}, series = {COSMO Newsletter}, journal = {COSMO Newsletter}, number = {6}, pages = {225 -- 235}, language = {en} }