@misc{KleinSeeligKurganskyetal., author = {Klein, Marten and Seelig, Torsten and Kurgansky, Michael V. and Ghasemi, Abouzar and Borcia, Ion-Dan and Will, Andreas and Schaller, Eberhard and Egbers, Christoph and Harlander, Uwe}, title = {Inertial wave excitation and focusing in a liquid bounded by a frustum and a cylinder}, series = {Journal of Fluid Mechanics}, journal = {Journal of Fluid Mechanics}, number = {vol. 751}, issn = {1750-6859}, doi = {10.1017/jfm.2014.304}, pages = {255 -- 297}, abstract = {The mechanism of localized inertial wave excitation and its efficiency is investigated for an annular cavity rotating with Ω0 . Meridional symmetry is broken by replacing the inner cylinder with a truncated cone (frustum). Waves are excited by individual longitudinal libration of the walls. The geometry is non-separable and exhibits wave focusing and wave attractors. We investigated laboratory and numerical results for the Ekman number E ≈ 10-6. inclination α = 5.71◦ and libration amplitudes ε 0.2 within the inertial wave band 0 < ω < 2Ω0 . Under the assumption that the inertial waves do not essentially affect the boundary-layer structure, we use classical boundary-layer analysis to study oscillating Ekman layers over a librating wall that is at an angle α = 0 to the axis of rotation. The Ekman layer erupts at frequency ω = f∗, where f∗ ≡ 2Ω0 sin α is the effective Coriolis parameter in a plane tangential to the wall. For the selected inclination this eruption occurs for the forcing frequency ω/Ω0 = 0.2. For the librating lids eruption occurs at ω/Ω0 = 2. The study reveals that the frequency dependence of the total kinetic energy Kω of the excited wave field is strongly connected to the square of the Ekman pumping velocity wE (ω) that, in the linear limit, becomes singular when the boundary layer erupts. This explains the frequency dependence of non-resonantly excited waves. By the localization of the forcing, the two configurations investigated, (i) frustum libration and (ii) lids together with outer cylinder in libration, can be clearly distinguished by their response spectra. Good agreement was found for the spatial structure of low-order wave attractors and periodic orbits (both characterized by a small number of reflections) in the frequency windows predicted by geometric ray tracing. For 'resonant' frequencies a significantly increased total bulk energy was found, while the energy in the boundary layer remained nearly constant. Inertial wave energy enters the bulk flow via corner beams, which are parallel to the characteristics of the underlying Poincar{\´e} problem. Numerical simulations revealed a mismatch between the wall-parallel mass fluxes near the corners. This leads to boundary-layer eruption and the generation of inertial waves in the corners.}, 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} } @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} } @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} } @misc{VautardGobietKeuler, author = {Vautard, Robert and Gobiet, Andreas and Keuler, Klaus}, title = {The simulation of European heat waves from an ensemble of regional climate models within the EURO-CORDEX project}, series = {Climate Dynamics}, volume = {41}, journal = {Climate Dynamics}, number = {9-10}, issn = {1432-0894}, doi = {10.1007/s00382-013-1714-z}, pages = {2555 -- 2575}, 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} } @misc{FruehFeldmannPanitzetal., author = {Fr{\"u}h, Barbara and Feldmann, Hendrik and Panitz, Hans-J{\"u}rgen and Sch{\"a}dler, Gerd and Jacob, Daniela and Lorenz, Peter and Keuler, Klaus}, title = {Determination of precipitation return values in complex terrain and their evaluation}, series = {Journal of Climate}, volume = {23}, journal = {Journal of Climate}, number = {9}, issn = {1520-0442}, doi = {10.1175/2009JCLI2685.1}, pages = {2257 -- 2274}, language = {en} } @incollection{Schaller, author = {Schaller, Eberhard}, title = {Simulation des gegenw{\"a}rtigen und zuk{\"u}nftigen Regionalklimas von Brandenburg}, series = {Globaler Wandel und regionale Entwicklung}, booktitle = {Globaler Wandel und regionale Entwicklung}, editor = {H{\"u}ttl, Reinhard F. and Emmermann, Rolf and Germer, Sonja and Naumann, Matthias and Bens, Oliver}, publisher = {Springer}, address = {Berlin [u.a.]}, doi = {10.1007/978-3-642-19478-8}, pages = {37 -- 142}, language = {de} } @misc{OPUS4-13853, title = {Tropospheric Chemistry}, editor = {Seiler, Wolfgang and Becker, Karl-Heinz and Schaller, Eberhard}, publisher = {Kluwer Academic Publishers}, address = {Dordrecht [u.a.]}, isbn = {1-4020-0694-2}, pages = {492}, language = {en} } @incollection{BeckerSchererMemmesheimeretal., author = {Becker, Andreas and Scherer, Bernhard and Memmesheimer, Michael and Geiß, Heiner}, title = {Studying the City Plume of Berlin on 20 July 1998 with Three Different Modelling Approaches}, series = {Tropospheric Chemistry}, booktitle = {Tropospheric Chemistry}, editor = {Seiler, Wolfgang and Becker, Karl-Heinz and Schaller, Eberhard}, publisher = {Kluwer Academic Publishers}, address = {Dordrecht [u.a.]}, isbn = {1-4020-0694-2}, pages = {41 -- 70}, language = {en} } @incollection{AnSchaller, author = {An, Ni and Schaller, Eberhard}, title = {Issues and Opportunities for Implementation of VSS in China}, series = {Voluntary Standard Systems}, booktitle = {Voluntary Standard Systems}, editor = {Schmitz-Hoffmann, Carsten and Schmidt, Michael and Hansmann, Berthold and Palekhov, Dmitry}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {978-3-642-35715-2}, doi = {10.1007/978-3-642-35716-9}, pages = {243 -- 251}, language = {en} } @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} }