@inproceedings{KochDahleyFuttereretal., author = {Koch, Sandy and Dahley, Norman and Futterer, Birgit and Egbers, Christoph}, title = {Das GeoFlow-Experiment auf der ISS: Auswertung erster Experimentdaten}, series = {Lasermethoden in der Str{\"o}mungstechnik, 16. Fachtagung, 9. - 11. September 2008}, booktitle = {Lasermethoden in der Str{\"o}mungstechnik, 16. Fachtagung, 9. - 11. September 2008}, editor = {Ruck, B.}, publisher = {GALA}, address = {Karslruhe}, isbn = {978-3-9805613-4-1}, pages = {S. 44}, language = {de} } @incollection{KochDahleyFuttereretal., author = {Koch, Sandy and Dahley, Norman and Futterer, Birgit and Egbers, Christoph}, title = {Sph{\"a}rische Wollaston-Schlieren-Interferometrie: Raum-Zeit-Analyse von unter- und {\"u}berkritischer Konvektion im rotierenden Kugelspalt (GeoFlow-Experiment)}, language = {de} } @misc{FuttererEgbersKochetal., author = {Futterer, Birgit and Egbers, Christoph and Koch, Sandy and Dahley, Norman and Jehring, Lothar}, title = {First identication of sub-and supercritical convection patterns from GeoFlow, the geophysical flow simulation experiment integrated in Fluid Science Laboratory}, language = {en} } @misc{KochHarlanderEgbers, author = {Koch, Sandy and Harlander, Uwe and Egbers, Christoph}, title = {Wave-attractors and mean flow in a spherical shell due to time-modulated rotation}, language = {en} } @inproceedings{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Rabitti, A. and Maas, L. R. M. and Egbers, Christoph}, title = {Wellen und Wellenattrktoren in einer Kugelschale mit zeitlich modulierter Rotation}, language = {de} } @misc{FuttererKochEgbers, author = {Futterer, Birgit and Koch, Sandy and Egbers, Christoph}, title = {Traveling waves in low and intermediate rotating spherical shell convection}, language = {en} } @inproceedings{FuttererZaussingerKochetal., author = {Futterer, Birgit and Zaussinger, Florian and Koch, Sandy and Krebs, Andreas and Egbers, Christoph}, title = {Nonlinear effects and associated instabilities in iso-viscous and temperature-dependent viscous thermal convection in spherical shells, the geophysical flow simulation experiment integrated in Fluid Science Laboratory}, language = {en} } @inproceedings{FuttererDahleyKochetal., author = {Futterer, Birgit and Dahley, Norman and Koch, Sandy and Scurtu, Nicoleta and Egbers, Christoph and Chossat, P. and Hollerbach, Rainer and Beltrame, Philippe and Breuer, Doris and Feudel, F. and Mutabazi, Innocent and Tuckerman, L. S.}, title = {From isoviscous to temperature-dependent viscous flow within the fluid physics ISS COLUMBUS laboratory experiment GeoFlow}, language = {en} } @misc{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Laboratory experiments of inertial waves in containers rotating with time modulation}, language = {en} } @misc{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Laboratory experiment of inertial wave-interactions in a rotating spherical shell}, language = {en} } @misc{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Laboratory experiments and numerical simulations of inertial wave-interactions in a rotating spherical shell}, language = {en} } @misc{FuttererDahleyKochetal., author = {Futterer, Birgit and Dahley, Norman and Koch, Sandy and Scurtu, Nicoleta and Egbers, Christoph}, title = {From isoviscous convective experiment 'GeoFlow I' to temperature-dependent viscosity in 'GeoFlow II' Fluid physics experiments on-board ISS for the capture of convection phenomena in Earth's outer core and mantle}, language = {en} } @inproceedings{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Laboratory experiment and numerical simulations of inertial wave interactions in a rotating spherical shell}, language = {en} } @inproceedings{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Inertial waves in a rotating spherical shell: Comparison between numerical simulations and laboratory experiments}, series = {European Geosciences Union (EGU), 9th General Assembly, Vienna, Austria, 22-27 April}, booktitle = {European Geosciences Union (EGU), 9th General Assembly, Vienna, Austria, 22-27 April}, language = {en} } @inproceedings{KochHarlanderHollerbachetal., author = {Koch, Sandy and Harlander, Uwe and Hollerbach, Rainer and Egbers, Christoph}, title = {Inertial waves in a spherical shell induced by librations of the inner sphere: experimental and numerical results}, series = {European Geosciences Union (EGU), 10th General Assembly, Vienna, Austria, 07 - 12 April 2013}, booktitle = {European Geosciences Union (EGU), 10th General Assembly, Vienna, Austria, 07 - 12 April 2013}, language = {en} } @misc{KochHarlanderEgbersetal., author = {Koch, Sandy and Harlander, Uwe and Egbers, Christoph and Hollerbach, Rainer}, title = {Inertial waves in a spherical shell induced by librations of the inner sphere: experimental and numerical results}, series = {Fluid Dynamics Research}, volume = {45}, journal = {Fluid Dynamics Research}, number = {3}, issn = {0169-5983}, doi = {10.1088/0169-5983/45/3/035504}, pages = {035504}, language = {en} } @misc{PohleKochGaedekeetal., author = {Pohle, Ina and Koch, Hagen and G{\"a}deke, Anne and Hinz, Christoph and Gr{\"u}newald, Uwe}, title = {Does water management reduce the uncertainty of projected climate change impacts on river discharge?}, publisher = {AGU Fall Meeting}, address = {San Francisco}, language = {en} } @inproceedings{PohleGaedekeKochetal., author = {Pohle, Ina and G{\"a}deke, Anne and Koch, Hagen and Sch{\"u}mberg, Sabine and Hinz, Christoph}, title = {Can water resources management alleviate the uncertainty of projected climate change impacts on river discharge? - A comparative study in two hydrologically similar catchments with different level of management}, series = {International Soil and Water Assessment Tool Conference. SWAT 2017, June 28 - 30, Warsaw, Poland, Book of Abstracts}, booktitle = {International Soil and Water Assessment Tool Conference. SWAT 2017, June 28 - 30, Warsaw, Poland, Book of Abstracts}, pages = {10 -- 11}, abstract = {Climate change impact studies are associated with error propagation and amplification of uncertainties through model chains from global climate models down to impact (e.g. hydrological) models. The effect of water management, which reduces discharge variability, is often not considered in climate change impact studies. Here, we investigated how water resources management influences discharge variability and uncertainty propagation of climate change scenarios by combining the analyses of observed flow records and model-based climate change impact simulations. Two neighbouring catchments, the Schwarze Elster River (Germany) and the Spree River (Germany and Czech Republic) which are similar in climate, topography and land use, but different in terms of water resources management were chosen as study area. The intense water resources management in the Spree River catchment includes a high reservoir capacity, water use in terms of mining discharges and water withdrawals by power plants as well as water transfers. The analysis of historical flow records focusses on variability indices (Parde index, Richards-Baker-Flashiness Index, Interquartile Ratio and Baseflow Index). The climate change impact simulations were carried out using a model cascade of (i) the statistical regional model STAR (100 stochastically generated realizations each for 3 scenarios with different prescribed temperature trend), (ii) the hydrological models SWIM and EGMO, and (iii) the water resources management model WBalMo. The analysis of the observed discharges reveals that the annual discharge variability in the Spree catchment is dominated by mining activities rather than natural rainfall-runoff processes. Due to the high reservoir capacity in the Spree catchment its discharge is characterised by less seasonality and short-term variability compared to the Schwarze Elster. Simulations with climate change scenarios assuming increasing temperature and decreasing precipitation result in pronounced reductions of discharge in both catchments. The differences in potential natural discharges between the Schwarze Elster and the Spree catchments as projected by the hydrological models SWIM and EGMO are marginal. The uncertainties related to the climate projection are propagated through the hydrological models. In the Schwarze Elster catchment, the managed discharges simulated by WBalMo are comparable to the potential natural discharges. In the Spree River however, the short-term variability is moderated by water resources management and managed discharge under climate change is less affected by amplification of uncertainties through model chains. The results of the study, which combines the analyses of observed flow records and model-based climate change impact simulations, imply that generally, effective water resources management reducing discharge variability hence also reduces uncertainty related to climate change impacts on river discharge. Catchments with a high storage ratio are thus less vulnerable to changing climate conditions. This underlines the role of water resources management in coping with climate change impacts. Yet, due to decreasing reservoir volumes in drought periods, reservoir management alone cannot compensate strong changes in climate conditions over long time periods.}, language = {en} } @inproceedings{PohleGaedekeKochetal., author = {Pohle, Ina and G{\"a}deke, Anne and Koch, Hagen and Sch{\"u}mberg, Sabine and Hinz, Christoph}, title = {Kann Wasserressourcenbewirtschaftung die Unsicherheiten projizierter Klimafolgen auf den Abfluss vermindern? - Ein Vergleich in zwei hydrologisch {\"a}hnlichen Einzugsgebieten mit unterschiedlichem Ausmaß des Bewirtschaftungseinflusses}, series = {M³ - Messen, Modellieren, Managen in Hydrologie und Wasserressourcenbewirtschaftung. Beitr{\"a}ge zum Tag der Hydrologie am 22./23. M{\"a}rz 2018 an der Technischen Universit{\"a}t Dresden}, booktitle = {M³ - Messen, Modellieren, Managen in Hydrologie und Wasserressourcenbewirtschaftung. Beitr{\"a}ge zum Tag der Hydrologie am 22./23. M{\"a}rz 2018 an der Technischen Universit{\"a}t Dresden}, editor = {Sch{\"u}tze, Niels and M{\"u}ller, Uwe and Schwarze, Robert and W{\"o}hling, Thomas and Grundmann, Jens}, publisher = {Technische Universit{\"a}t}, address = {Dresden}, pages = {S. 30}, abstract = {Studien zum Einfluss des zuk{\"u}nftigen Klimawandels auf das Abflussgeschehen fokussieren oft auf die Fortpflanzung von Unsicherheiten in Modellkaskaden, ber{\"u}cksichtigen meist jedoch die Wasserressourcenbewirtschaftung nur ungen{\"u}gend. Wir untersuchten den Einfluss der Wasserressourcenbewirtschaftung auf die Abflussvariabilit{\"a}t und die Fortpflanzung von Unsicherheiten von Klimaprojektionen auf Abflusssimulationen in den Einzugsgebieten von Spree (bis Pegel Große Tr{\"a}nke: 6200 km²) und Schwarzer Elster (5700 km²). Die Einzugsgebiete {\"a}hneln sich hinsichtlich Klima, Topographie, Boden und Landnutzung, jedoch ist das Spreeeinzugsgebiet st{\"a}rker durch den Braunkohletagebau und die damit verbundenen Bewirtschaftung gepr{\"a}gt und durch einen h{\"o}heren Speicherausbaugrad gekennzeichnet. Um zwischen Bewirtschaftungseinfl{\"u}ssen und meteorologischen Einfl{\"u}ssen zu separieren, wurden f{\"u}r den Zeitraum 1961-2005 beobachtete Abfl{\"u}sse mit durch das Modell SWIM rekonstruierten nat{\"u}rlichen (d.h. ohne Bewirtschaftungseinfluss) Abfl{\"u}ssen der Vergangenheit verglichen. M{\"o}gliche Einfl{\"u}sse des Klimawandels wurden f{\"u}r den Zeitraum 2018-2052 auf Grundlage von 3 Szenarien des statistischen Regionalmodells STAR (je 100 Realisierungen) mit SWIM (nat{\"u}rliche Abfl{\"u}sse) und dem Langfristbewirtschaftungsmodell WBalMo (bewirtschaftete Abfl{\"u}sse) modelliert. Die Analyse erfolgte mit Fokus auf Saisonalit{\"a}t, Oszillation, Verteilung und r{\"a}umliche Variabilit{\"a}t der Abfl{\"u}sse. Der Vergleich zwischen beobachteten und nat{\"u}rlichen Abfl{\"u}ssen der vergangenen Jahrzehnte zeigt, dass die zwischenj{\"a}hrliche Abflussvariabilit{\"a}t im Spreeeinzugsgebiet st{\"a}rker durch Grubenwassereinleitungen als durch nat{\"u}rliche hydrologische Prozesse bestimmt wurde. Zus{\"a}tzlich f{\"u}hrt der h{\"o}here Speicherausbaugrad dazu, dass die kurzzeitliche und saisonale Variabilit{\"a}t im Spreeeinzugsgebiet geringer als im Einzugsgebiet der Schwarzen Elster ist. Simulationen mit Klimaszenarien, welche steigende Jahresmitteltemperaturen und einen R{\"u}ckgang der Niederschlagsjahressummen enthalten, f{\"u}hren zu deutlichen Abflussr{\"u}ckg{\"a}ngen. Die Unterschiede der nat{\"u}rlichen Abfl{\"u}sse beider Einzugsgebiete sind gering, die Unsicherheiten der Klimaprojektionen werden durch die hydrologische Modellierung verst{\"a}rkt. Die nat{\"u}rlichen und bewirtschafteten Abfl{\"u}sse der Schwarzen Elster unter Klimawandel unterscheiden sich kaum. Im Spreeeinzugsgebiet zeigt sich eine deutliche Verringerung der Variabilit{\"a}t und Unsicherheiten unter Klimawandel von den nat{\"u}rlichen zu den bewirtschafteten Abfl{\"u}ssen. Die Analysen zeigen, dass effektive Wasserressourcenbewirtschaftung die Abflussvariabilit{\"a}t verringern kann und damit auch dazu beitragen kann, die sich aus Klimawandelprojektionen ergebenden Unsicherheiten zu vermindern. Einzugsgebiete mit einem hohen Ausbaugrad weisen weniger Vulnerabilit{\"a}t bez{\"u}glich klimatischer {\"A}nderungen auf. Dies unterstreicht die Bedeutung von Wasserresourcenbewirt-schaftungf{\"u}r die Anpassung an den Klimawandel.}, language = {de} } @misc{PohleGaedekeSchuembergetal., author = {Pohle, Ina and G{\"a}deke, Anne and Sch{\"u}mberg, Sabine and Hinz, Christoph and Koch, Hagen}, title = {Management Influences on Stream-Flow Variability in the Past and Under Potential Climate Change in a Central European Mining Region}, series = {Water Resource Management}, volume = {33}, journal = {Water Resource Management}, number = {15}, issn = {1573-1650}, doi = {10.1007/s11269-019-02432-3}, pages = {5191 -- 5206}, abstract = {Robust assessments of stream-flow volume and variability under current and potential future conditions are essential for sustainable water resources planning and management. Nonlinear and overlapping responses to climate, land use, and water resources management (WRM) make it difficult to link observed stream-flow variability to individual drivers and to project potential future changes in stream-flow volume and variability. Here, we investigate WRM influences on stream-flow variability for two rivers with similar natural catchment characteristics, the Schwarze Elster and the Spree. The Schwarze Elster is characterized by less intensive WRM compared to the Spree. Management influences on stream-flow variability in the past were analysed by comparing observed managed stream-flow with simulated natural flow (model SWIM). Simulation results of natural flow and managed stream-flow (model WBalMo) forced by different climate scenarios were investigated to assess management influences on potential future stream-flow. The Schwarze Elster shows little management influences on stream-flow both in the past and under future scenarios. WRM related to lignite mining activities rather than natural processes dominated seasonal and annual stream-flow variability of the Spree in the past, while reservoir management mainly impacted short-term variability. Long-term and short-term stream-flow variability of the Spree are expected to be further reduced in future by reservoir management and water transfers to ensure minimum flow requirements. Strong impacts ofWRM in reducing stream-flow variability in future scenarios underline the role of reservoir management as an effective and flexible adaptation option to uncertain climate change impacts on hydrology.}, language = {en} } @misc{FischerClausenSchwarzetal., author = {Fischer, Inga Anita and Clausen, Caterina J. and Schwarz, Daniel and Zaumseil, Peter and Capellini, Giovanni and Virgilio, Michele and Da Silva Figueira, Maria Cecilia and Birner, Stefan and Koelling, Sebastian and Koenraad, Paul M. and Huang, Michael R. S. and Koch, Christoph T. and Wendav, Torsten and Busch, Kurt and Schulze, J{\"o}rg}, title = {Composition analysis and transition energies of ultrathin Sn-rich GeSn quantum wells}, series = {Physical Review Materials}, volume = {4}, journal = {Physical Review Materials}, number = {2}, issn = {2475-9953}, doi = {10.1103/PhysRevMaterials.4.024601}, pages = {10}, language = {en} } @misc{SchlipfTetznerSpiritoetal., author = {Schlipf, Jon and Tetzner, Henriette and Spirito, Davide and Manganelli, Constanza Lucia and Capellini, Giovanni and Huang, Michael R. S. and Koch, Christoph T. and Clausen, Caterina J. and Elsayed, Ahmed and Schulze, J{\"o}rg and Fischer, Inga Anita}, title = {Raman shifts in MBE-grown SixGe1 - x - ySny alloys with large Si content}, series = {Journal of Raman Spectroscopy}, journal = {Journal of Raman Spectroscopy}, issn = {1097-4555}, doi = {10.1002/jrs.6098}, pages = {9}, language = {en} } @misc{BiermannSommerauerDieschetal., author = {Biermann, Niklas and Sommerauer, Laura and Diesch, Sophia and Koch, Christoph and Jung, Friedrich and Kehrer, Andreas and Prantl, Lukas and Taeger, Christian D.}, title = {The influence of pulsed electromagnetic field therapy (PEMFT) on cutaneous blood flow in healthy volunteers}, series = {Clinical Hemorheology and Microcirculation}, volume = {76}, journal = {Clinical Hemorheology and Microcirculation}, number = {4}, doi = {10.3233/CH-209224}, pages = {495 -- 501}, abstract = {BACKGROUND: The biophysical interaction induced by low energy pulsed electromagnetic field therapy (PEMFT) on the capillary microcirculation is not well understood. Several studies indicate a significant effect of PEMFT in patients with chronic medical conditions. OBJECTIVE: The aim of this study was to evaluate the influence of PEMFT on skin microcirculation in healthy volunteers. METHODS: 15 healthy participants were included. Nine PEMF treatments were applied over three weeks in an 48-hour interval. The PEMFT system (BEMER) was placed beneath one of the participants' leg with the contralateral side serving as a control. A forty-minute application period was preceded by a 10-minute resting phase. Measuring was done using two Laser Doppler probes (LEA) placed on each anterior lateral thigh. RESULTS: All outcome parameters including flow, mixed venous oxygen saturation and relative venous hemoglobin showed a significant increase during the experiment when compared to the baseline values of the resting phase in both groups (p < 0.01). Comparing both groups, the measurement values during the experiment did not differ (p > 0.05) except for higher flow values in the control group (P = 0.03). Over time, baseline values of both groups showed no significant difference (p > 0.05). CONCLUSION: We found a significant increase of all measurement parameters during the study compared to the baseline values with no difference between the PEMF and control group.}, language = {en} } @misc{DoebbelingHildebrandtMierschKhannaetal., author = {D{\"o}bbeling-Hildebrandt, Niklas and Miersch, Klaas and Khanna, Tarun M. and Bachelet, Marion and Bruns, Stephan B. and Callaghan, Max and Edenhofer, Ottmar and Flachsland, Christian and Forster, Piers M. and Kalkuhl, Matthias and Koch, Nicolas and Lamb, William F. and Ohlendorf, Nils and Steckel, Jan Christoph and Minx, Jan C.}, title = {Systematic review and meta-analysis of ex-post evaluations on the effectiveness of carbon pricing}, series = {Nature communications}, volume = {15}, journal = {Nature communications}, number = {1}, publisher = {Nature Publishing Group UK}, address = {London}, issn = {2041-1723}, doi = {10.1038/s41467-024-48512-w}, pages = {1 -- 12}, abstract = {Today, more than 70 carbon pricing schemes have been implemented around the globe, but their contributions to emissions reductions remains a subject of heated debate in science and policy. Here we assess the effectiveness of carbon pricing in reducing emissions using a rigorous, machine-learning assisted systematic review and meta-analysis. Based on 483 effect sizes extracted from 80 causal ex-post evaluations across 21 carbon pricing schemes, we find that introducing a carbon price has yielded immediate and substantial emission reductions for at least 17 of these policies, despite the low level of prices in most instances. Statistically significant emissions reductions range between -5\% to -21\% across the schemes (-4\% to -15\% after correcting for publication bias). Our study highlights critical evidence gaps with regard to dozens of unevaluated carbon pricing schemes and the price elasticity of emissions reductions. More rigorous synthesis of carbon pricing and other climate policies is required across a range of outcomes to advance our understanding of "what works" and accelerate learning on climate solutions in science and policy.}, language = {en} }