@misc{PreinGobietTruhetzetal., author = {Prein, Andreas and Gobiet, Andreas and Truhetz, Heimo and Keuler, Klaus and Goergen, Klaus and Teichmann, Claas and Fox Maule, C. and Meijgaard, Erik van}, title = {Precipitation in the EURO-CORDEX 0.11° and 0.44° simulations: high resolution, high benefits?}, series = {Climate Dynamics}, volume = {46}, journal = {Climate Dynamics}, number = {1}, issn = {0930-7575}, doi = {10.1007/s00382-015-2589-y}, pages = {383 -- 412}, abstract = {In the framework of the EURO-CORDEX initiative an ensemble of European-wide high-resolution regional climate simulations on a 0.11∘(∼12.5km) grid has been generated. This study investigates whether the fine-gridded regional climate models are found to add value to the simulated mean and extreme daily and sub-daily precipitation compared to their coarser-gridded 0.44∘(∼50km) counterparts. Therefore, pairs of fine- and coarse-gridded simulations of eight reanalysis-driven models are compared to fine-gridded observations in the Alps, Germany, Sweden, Norway, France, the Carpathians, and Spain. A clear result is that the 0.11∘ simulations are found to better reproduce mean and extreme precipitation for almost all regions and seasons, even on the scale of the coarser-gridded simulations (50 km). This is primarily caused by the improved representation of orography in the 0.11∘ simulations and therefore largest improvements can be found in regions with substantial orographic features. Improvements in reproducing precipitation in the summer season appear also due to the fact that in the fine-gridded simulations the larger scales of convection are captured by the resolved-scale dynamics . The 0.11∘ simulations reduce biases in large areas of the investigated regions, have an improved representation of spatial precipitation patterns, and precipitation distributions are improved for daily and in particular for 3 hourly precipitation sums in Switzerland. When the evaluation is conducted on the fine (12.5 km) grid, the added value of the 0.11∘ models becomes even more obvious.}, language = {en} } @misc{KnistGoergenKeuler, author = {Knist, Sebastian and Goergen, Klaus and Keuler, Klaus}, title = {Land-atmosphere coupling in EURO-CORDEX evaluation experiments}, series = {Journal of Geophysical Research Atmosperes}, volume = {122}, journal = {Journal of Geophysical Research Atmosperes}, number = {1}, issn = {2169-8996}, doi = {10.1002/2016JD025476}, pages = {79 -- 103}, abstract = {Interactions between the land surface and the atmosphere play a fundamental role in the weather and climate system. Here we present a comparison of summertime land-atmosphere coupling strength found in a subset of the ERA-Interim-driven European domain Coordinated Regional Climate Downscaling Experiment (EURO-CORDEX) model ensemble (1989 - 2008). Most of the regional climate models (RCMs) reproduce the overall soil moisture interannual variability, spatial patterns, and annual cycles of surface exchange fluxes for the different European climate zones suggested by the observational Global Land Evaporation Amsterdam Model (GLEAM) and FLUXNET data sets. However, some RCMs differ substantially from FLUXNET observations for some regions. The coupling strength is quantified by the correlation between the surface sensible and the latent heat flux, and by the correlation between the latent heat flux and 2 m temperature. The first correlation is compared to its estimate from the few available long-term European high-quality FLUXNET observations, and the latter to results from gridded GLEAM data. The RCM simulations agree with both observational datasets in the large-scale pattern characterized by strong coupling in southern Europe and weak coupling in northern Europe. However, in the transition zone from strong to weak coupling covering large parts of central Europe many of the RCMs tend to overestimate the coupling strength in comparison to both FLUXNET and GLEAM. The RCM ensemble spread is caused primarily by the different land surface models applied, and by the model-specific weather conditions resulting from different atmospheric parameterizations}, language = {en} } @misc{BeckerSchallerKeuler, author = {Becker, Andreas and Schaller, Eberhard and Keuler, Klaus}, title = {Continuous four-dimensional source attribution for the Berlin area during two days in July 1994. Part II: Sensitivy studies}, abstract = {The multiple nested three-dimensional (3D) mesoscale Eulerian grid point model MM5 is directly coupled with a Lagrangian particle trajectory model in order to perform a four-dimensional source attribution for the area of Berlin based on the horizontal distribution of the import probability density (IPD).}, language = {en} } @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{PreinGobietSuklitschetal., author = {Prein, Andreas and Gobiet, Andreas and Suklitsch, Martin and Truhetz, Heimo and Awan, N. K. and Keuler, Klaus and Georgievski, Goran}, title = {Added value of convection permitting seasonal simulations}, series = {Climate Dynamics}, volume = {41}, journal = {Climate Dynamics}, doi = {10.1007/s00382-013-1744-6}, pages = {2655 -- 2677}, language = {en} } @misc{KotlarskiKeulerBossingChristensenetal., author = {Kotlarski, Sven and Keuler, Klaus and B{\o}ssing Christensen, Ole and Colette, Augustin and D{\´e}qu{\´e}, Michel}, title = {Regional climate modeling on European scales: A joint standard evaluation of the EURO-CORDEX RCM ensemble}, series = {Geoscientific Model Development}, journal = {Geoscientific Model Development}, number = {7}, doi = {10.5194/gmd-7-1297-2014}, pages = {1297 -- 1333}, language = {en} } @misc{PanitzDosioBuechneretal., author = {Panitz, Hans-J{\"u}rgen and Dosio, Alessandro and B{\"u}chner, Mathias and L{\"u}thi, Daniel and Keuler, Klaus}, title = {COSMO-CLM (CCLM) climate simulations over CORDEX Africa domain: Analysis of the ERA-Interim driven simulations at 0.44◦ and 0.22◦ resolution}, series = {Climate Dynamics}, volume = {42}, journal = {Climate Dynamics}, number = {11-12}, issn = {1432-0894}, doi = {10.1007/s00382-013-1834-5}, pages = {3015 -- 3038}, language = {en} } @misc{BoehmKeulerOesterleetal., author = {B{\"o}hm, Uwe and Keuler, Klaus and {\"O}sterle, Hermann and K{\"u}cken, Martin and Hauffe, Detlef}, title = {Quality of a climate reconstruction for the CADSES regions}, series = {Meteorologische Zeitschrift}, volume = {17}, journal = {Meteorologische Zeitschrift}, number = {4}, issn = {1610-1227}, doi = {10.1127/0941-2948/2008/0318}, pages = {477 -- 485}, abstract = {We used the regional climate model CCLM 4 to reconstruct the climate over the CADSES regions for the period 1961-2000. This most recent model version is currently still in a test phase. The simulation quality for this part of the entire simulation area is exemplarily analyzed by using a small but representative subset of model variables. Mean sea level pressure is chosen as an indicator for the behavior of the near-surface dynamics. Furthermore, the two regional variables 2 m temperature and precipitation are evaluated, which are of relevance for hydrological applications. For additional analyses to identify sources of uncertainty, we used soil moisture and cloudiness. Altogether, the accuracy of the simulation results can be judged as being in good agreement with the results of similar simulations by other regional climate models over Europe. Area-averaged monthly mean 2 m temperatures during winter show a cold bias of about -2 K. The simulated mean sea level pressure is with a bias of about 2 hPa slightly too high compared to the used reference data set. Although cloud cover evaluation hints at insufficiencies in the corresponding parameterization, further analyses are required to unambiguously identify the causes for this cold bias. During summer, higher 2 m temperatures linked to reduced precipitation are identified in nearly identical regions over southern and southeastern Europe. Further analyses of soil moisture evolution and cloud cover give evidence for a source of uncertainty in the surface hydrological scheme. Altogether, the detected differences do not exceed the typical ranges of uncertainty in comparable regional climate simulations over Europe. For input in hydrological applications, however, the uncertainties produced by the CCLM simulation described here have to be reduced in the medium term.}, language = {en} } @misc{FeldmannFruehSchaedleretal., author = {Feldmann, Hendrik and Fr{\"u}h, Barbara and Sch{\"a}dler, Gerd and Panitz, Hans-J{\"u}rgen and Keuler, Klaus and Jacob, Daniela and Lorenz, Peter}, title = {Evaluation of the precipitation for south-western Germany from high resolution simulations with regional climate models}, series = {Meteorologische Zeitschrift}, volume = {17}, journal = {Meteorologische Zeitschrift}, number = {4}, issn = {1610-1227}, doi = {10.1127/0941-2948/2008/0295}, pages = {455 -- 465}, language = {en} } @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} }