@misc{JacobKeulerGeorgievskietal., author = {Jacob, Daniela and Keuler, Klaus and Georgievski, Goran and Radtke, Kai}, title = {EURO-CORDEX: new high-resolution climate change projections for European impact research}, series = {Regional Environmental Change}, volume = {14}, journal = {Regional Environmental Change}, number = {2}, issn = {1436-378X}, doi = {10.1007/s10113-013-0499-2}, pages = {563 -- 578}, abstract = {A new high-resolution regional climate change ensemble has been established for Europe within the World Climate Research Program Coordinated Regional Downscaling Experiment (EURO-CORDEX) initiative. The first set of simulations with a horizontal resolution of 12.5 km was completed for the new emission scenarios RCP4.5 and RCP8.5 with more simulations expected to follow. The aim of this paper is to present this data set to the different communities active in regional climate modelling, impact assessment and adaptation. The EURO-CORDEX ensemble results have been compared to the SRES A1B simulation results achieved within the ENSEMBLES project. The large-scale patterns of changes in mean temperature and precipitation are similar in all three scenarios, but they differ in regional details, which can partly be related to the higher resolution in EURO-CORDEX. The results strengthen those obtained in ENSEMBLES, but need further investigations. The analysis of impact indices shows that for RCP8.5, there is a substantially larger change projected for temperature-based indices than for RCP4.5. The difference is less pronounced for precipitation-based indices. Two effects of the increased resolution can be regarded as an added value of regional climate simulations. Regional climate model simulations provide higher daily precipitation intensities, which are completely missing in the global climate model simulations, and they provide a significantly different climate change of daily precipitation intensities resulting in a smoother shift from weak to moderate and high intensities.}, language = {en} } @misc{JacobKeulerGeorgievskietal., author = {Jacob, Daniela and Keuler, Klaus and Georgievski, Goran and Radtke, Kai}, title = {Erratum to: EURO-CORDEX: new high-resolution climate change projections for European impact research}, series = {Regional Environmental Change}, volume = {14}, journal = {Regional Environmental Change}, number = {2}, issn = {1436-378X}, doi = {10.1007/s10113-014-0587-y}, pages = {579 -- 581}, language = {en} } @misc{GeorgievskiKeulerWilletal., author = {Georgievski, Goran and Keuler, Klaus and Will, Andreas and Radtke, Kai}, title = {Evaluation of Central European and Eastern Alpine seasonal climate simulated with CCLM: double nesting vs. direct forcing techniques}, series = {COSMO Newsletter}, journal = {COSMO Newsletter}, number = {11}, pages = {133 -- 142}, language = {en} } @inproceedings{RadtkeKeuler, author = {Radtke, Kai S. and Keuler, Klaus}, title = {Climate change in Europe simulated by the regional climate model COSMO-CLM}, series = {2nd International Lund RCM Workshop : 21st Century Challenges in Regional-scale Climate Modelling, Lund University, Sweden, 4-8 May 2008, workshop proceedings}, booktitle = {2nd International Lund RCM Workshop : 21st Century Challenges in Regional-scale Climate Modelling, Lund University, Sweden, 4-8 May 2008, workshop proceedings}, editor = {Rockel, Burkhardt and B{\"a}rring, Lars and Reckermann, Marcus}, publisher = {International BALTEX Secretariat}, address = {GKSS Forschungszentrum Geesthacht}, pages = {56 -- 57}, language = {en} } @inproceedings{KeulerRadtkeSchaller, author = {Keuler, Klaus and Radtke, Kai S. and Schaller, Eberhard}, title = {Effect of internal variability on regional climate change projections}, series = {2nd International Lund RCM Workshop : 21st Century Challenges in Regional-scale Climate Modelling, Lund University, Sweden, 4-8 May 2008, workshop proceedings}, booktitle = {2nd International Lund RCM Workshop : 21st Century Challenges in Regional-scale Climate Modelling, Lund University, Sweden, 4-8 May 2008, workshop proceedings}, editor = {Rockel, Burkhardt and B{\"a}rring, Lars and Reckermann, Marcus}, publisher = {International BALTEX Secretariat}, address = {GKSS Forschungszentrum Geesthacht}, pages = {132 -- 133}, language = {en} } @misc{KeulerRadtkeKotlarskietal., author = {Keuler, Klaus and Radtke, Kai and Kotlarski, Sven and L{\"u}thi, Daniel}, title = {Regional climate change over Europe in COSMO-CLM: Influence of emission scenario and driving global model}, series = {Meteorologische Zeitschrift}, volume = {25}, journal = {Meteorologische Zeitschrift}, number = {2}, issn = {0941-2948}, doi = {10.1127/metz/2016/0662}, pages = {121 -- 136}, abstract = {The variability of climate change over Europe is analyzed in a new ensemble of eight high-resolution scenario simulations with the dynamically nested regional climate model COSMO-CLM. The simulations are a contribution of the CLM-Community to EURO-CORDEX - the European branch of the international CORDEX initiative. The study documents the influence of two emission scenarios (RCP4.5 and RCP8.5) and four driving global climate models (MPI-ESM-LR, HadGEM2-ES, CNRM-CM5, EC-EARTH) on the climate change signal of seasonal near-surface air temperature, seasonal precipitation amount and daily precipitation intensity in eight different regions of Europe. Both temperature and precipitation changes show comparable spatial patterns across the ensemble. The warming magnitude, however, strongly depends on the emission scenario and the driving GCM. The analysis demonstrates that the influence of the driving GCM on the temperature change signal can be of comparable magnitude as the influence of the emission scenario. For seasonal precipitation changes the influence of the driving GCM is even more important. All ensemble members show a consistent increase in the frequency of days with intense precipitation while the total number of precipitation days decreases. A further aspect is the comparison between the climate change signals in the regional and the driving global simulations. A critical intensity class is used to quantify the transition from decreasing to increasing precipitation frequencies. The analysis reveals that the variability of frequency changes is smaller in the regional than in the global model ensemble, which can be interpreted as an improved robustness and a possible added value of the regional projections. It is also shown that the regional simulations tend to reduce the seasonal mean temperature change of the driving global simulation. In some seasons and regions the damping of the warming signal can amount to more than 2K. Overall, the analysis reveals a strong influence of comparable magnitude of the choice of the emission scenario and the driving global model on regional climate change signals, and stresses the necessity of a large regional model ensemble for a reliable and robust assessment of regional climate change.}, language = {en} } @techreport{HuebenerBuelowFookenetal., author = {H{\"u}bener, Heike and B{\"u}low, Katharina and Fooken, Cornelia and Fr{\"u}h, Barbara and Hoffmann, Peter and H{\"o}pp, Simona and Keuler, Klaus and Menz, Christoph and Mohr, Viktoria and Radtke, Kai and Woldt, Michael}, title = {ReKliEs-De Ergebnisbericht}, publisher = {Eigenverlag des Hessischen Landesamtes HLNUG}, address = {Wiesbaden}, pages = {56}, language = {de} } @techreport{HuebenerSpekatBuelowetal., author = {H{\"u}bener, Heike and Spekat, Arne and B{\"u}low, Katharina and Fr{\"u}h, Barbara and Keuler, Klaus and Menz, Christoph and Radtke, Kai and Ramthun, Hans}, title = {ReKliEs-De Nutzerhandbuch}, publisher = {World Data Center for Climate (WDCC) at DKRZ}, address = {Hamburg}, doi = {10.2312/WDCC/ReKliEsDe_Nutzerhandbuch}, pages = {II, 86, XIV}, language = {de} } @misc{ToelleBreilRadtkeetal., author = {T{\"o}lle, Merja H. and Breil, Marcus and Radtke, Kai and Panitz, Hans-J{\"u}rgen}, title = {Sensitivity of European temperature to albedo parameterization in the regional climate model COSMO CLM linked to extreme land use changes}, series = {Frontiers in Environmental Science}, volume = {6}, journal = {Frontiers in Environmental Science}, issn = {2296-665X}, doi = {10.3389/fenvs.2018.00123}, pages = {16}, language = {en} } @misc{DavinRechidBreiletal., author = {Davin, Edouard and Rechid, Diana and Breil, Marcus and Cardoso, Rita M. and Coppola, Erika and Hoffmann, Peter and Jach, Lisa L. and Katragkou, Eleni and Noblet-Ducoudr{\´e}, Nathalie de and Radtke, Kai and Raffa, Mario and Soares, Pedro and Sofiadis, Giannis and Strada, Susanna and Strandberg, Gustav and T{\"o}lle, Merja H. and Warrach-Sagi, Kirsten and Wulfmeyer, Volker}, title = {Biogeophysical impacts of deforestation in Europe First results from the LUCAS Regional Climate Mode intercomparison}, series = {Earth System Dynamics}, volume = {11}, journal = {Earth System Dynamics}, number = {1}, issn = {2190-4995}, doi = {10.5194/esd-11-183-2020}, pages = {183 -- 200}, abstract = {The Land Use and Climate Across Scales Flagship Pilot Study (LUCAS FPS) is a coordinated community effort to improve the integration of land use change (LUC) in regional climate models (RCMs) and to quantify the biogeophysical effects of LUC on local to regional climate in Europe. In the first phase of LUCAS, nine RCMs are used to explore the biogeophysical impacts of re-/afforestation over Europe: two idealized experiments representing respectively a non-forested and a maximally forested Europe are compared in order to quantify spatial and temporal variations in the regional climate sensitivity to forestation. We find some robust features in the simulated response to forestation. In particular, all models indicate a year-round decrease in surface albedo, which is most pronounced in winter and spring at high latitudes. This results in a winter warming effect, with values ranging from +0.2 to +1 K on average over Scandinavia depending on models. However, there are also a number of strongly diverging responses. For instance, there is no agreement on the sign of temperature changes in summer with some RCMs predicting a widespread cooling from forestation (well below -2 K in most regions), a widespread warming (around +2 K or above in most regions) or a mixed response. A large part of the inter-model spread is attributed to the representation of land processes. In particular, differences in the partitioning of sensible and latent heat are identified as a key source of uncertainty in summer. Atmospheric processes, such as changes in incoming radiation due to cloud cover feedbacks, also influence the simulated response in most seasons. In conclusion, the multi-model approach we use here has the potential to deliver more robust and reliable information to stakeholders involved in land use planning, as compared to results based on single models. However, given the contradictory responses identified, our results also show that there are still fundamental uncertainties that need to be tackled to better anticipate the possible intended or unintended consequences of LUC on regional climates.}, language = {en} } @techreport{HollwegBoehmFastetal., author = {Hollweg, Heinz-Dieter and B{\"o}hm, Uwe and Fast, Irina and Hennemuth, Barbara and Keuler, Klaus and Keup-Thiel, Elke and Lautenschlager, Michael and Legutke, Stephanie and Radtke, Kai and Rockel, Burkhardt and Schubert, Martina and Will, Andreas and Woldt, Michael and Wunram, Claudia}, title = {Ensemble Simulations over Europe with the Regional Climate Model CLM forced with IPCC AR4 Global Scenarios}, publisher = {Max-Planck-Institut f{\"u}r Meteorologie}, address = {Hamburg}, doi = {10.2312/WDCC/MaD_TeReport_No03}, pages = {152}, abstract = {Regional climate projections have been performed for Europe with the climate version CLM (version 3.1) of the 'Lokal-Modell' (LM) of the German Meteorological Service. CLM has been forced with output of the ECHAM5/MPIOM global climate model of the Max Planck Institute for Meteorology, which contributed to the fourth climate assessment report (AR4) of the International Panel on Climate Change (IPCC). The results of the global model for the IPCC A1B and B1 scenarios as well as the reconstruction of the last four decades of the 20th century (20C3M) for the AR4 are dynamically scaled down to the CLM grid cell size of about 18×18 km2. Climatological parameters including all model variables and additional quantities characterising the climate are available from the World Data Centre for Climate database run by the German climate service group Model and Data. They can be accessed by the general public at no costs with the help of M and D. In particular, the 'Service Group Adaptation' (SGA) has been established at M and D to assist adaptation projects funded by the German Federal Ministry of Education and Research (BMBF) giving advice on the interpretation of the CLM model results.}, language = {en} } @misc{GerlingDrechslerKeuleretal., author = {Gerling, Charlotte and Drechsler, Martin and Keuler, Klaus and Leins, Johannes A. and Radtke, Kai and Schulz, Bj{\"o}rn and Sturm, Astrid and W{\"a}tzold, Frank}, title = {Modelling the cost-effective spatio-temporal allocation of conservation measures in agricultural landscapes facing}, publisher = {ZBW-Leibnitz Information Centre for Economics}, address = {Kiel ; Hamburg}, pages = {22}, abstract = {Beitr{\"a}ge zur Jahrestagung des Vereins f{\"u}r Socialpolitik 2021: Climate Economics}, language = {en} } @misc{GerlingDrechslerKeuleretal., author = {Gerling, Charlotte and Drechsler, Martin and Keuler, Klaus and Leins, Johannes A. and Radtke, Kai and Schulz, Bj{\"o}rn and Sturm, Astrid and W{\"a}tzold, Frank}, title = {Cost-effective conservation in the face of climate change: combining ecological-economic modelling and climate science for the cost-effective spatio-temporal allocation of conservation measures in agricultural landscapes}, series = {MPRA paper}, journal = {MPRA paper}, pages = {21}, language = {en} } @misc{GerlingDrechslerKeuleretal., author = {Gerling, Charlotte and Drechsler, Martin and Keuler, Klaus and Leins, Johannes A. and Radtke, Kai and Schulz, Bj{\"o}rn and Sturm, Astrid and W{\"a}tzold, Frank}, title = {Climate-ecological-economic modelling for the cost-effective spatiotemporal allocation of conservation measures in cultural landscapes facing climate change}, series = {Q Open}, volume = {2}, journal = {Q Open}, number = {1}, issn = {2633-9048}, doi = {10.1093/qopen/qoac004}, pages = {1 -- 20}, language = {en} } @misc{GerlingSturmWaetzoldetal., author = {Gerling, Charlotte and Sturm, Astrid and W{\"a}tzold, Frank and Keuler, Klaus and Radtke, Kai and Drechsler, Martin and Leins, Johannes A.}, title = {{\"O}konomie der Klimaanpassung zum Schutz der biologischen Vielfalt ; Postervorstellung : BfN Statuskonferenz "Biodiversit{\"a}t und Klimawandel - Synergien erforschen" in Berlin, 7.12.2023}, doi = {10.13140/RG.2.2.16540.97923}, pages = {2}, language = {de} }