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Malte Niklaß

Bio: Malte Niklaß is an academic researcher from German Aerospace Center. The author has contributed to research in topics: Air traffic control & Global warming. The author has an hindex of 6, co-authored 24 publications receiving 168 citations. Previous affiliations of Malte Niklaß include Hamburg University of Technology.

Papers
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Journal ArticleDOI
TL;DR: The WeCare project (Utilizing Weather information for Climate efficient and eco-efficient future aviation) as mentioned in this paper aimed at finding solutions for reducing the climate impact of aviation based on an improved understanding of the atmospheric impact from aviation by making use of measurements and modeling approaches.

73 citations

Journal ArticleDOI
TL;DR: In this article, the authors present an interim mitigation strategy, which bridges this time period by rerouting affected flight trajectories optimally around the resulting climate restricted airspaces with regard to monetary costs for varying threshold values.

33 citations

Journal ArticleDOI
28 Apr 2020
TL;DR: A collaborative system of systems modeling approach for UAM is presented and a pool of low-fidelity physical analysis components is developed and integrated into the Remote Component Environment (RCE) workflow engine to quickly identify physical effects and cross-disciplinary influences of UAM.
Abstract: The current push in automation, communication, and electrical energy storage technologies has the potential to lift urban mobility into the sky. As several urban air mobility (UAM) concepts are conceivable, all relevant physical effects as well as mutual interrelations of the UAM system have to be addressed and evaluated at a sufficient level of fidelity before implementation. Therefore, a collaborative system of systems modeling approach for UAM is presented. To quickly identify physical effects and cross-disciplinary influences of UAM, a pool of low-fidelity physical analysis components is developed and integrated into the Remote Component Environment (RCE) workflow engine. This includes, i. a., the disciplines of demand forecast, trajectory, vertiport, and cost modeling as well as air traffic flow and capacity management. The definition and clarification of technical interfaces require intensive cooperation between specialists with different areas of expertise. To reduce this communication effort, the Common Parametric Aircraft Configuration Schema (CPACS) is adapted and used as central data exchange format. The UAM system module is initially applied for a 24-hour simulation of three generic networks in Hamburg City. After understanding the basic system-level behavior, higher level analysis components and feedback loops must be integrated in the UAM system module for evaluation and optimization of explicit operating concepts.

22 citations

Proceedings ArticleDOI
15 Jun 2016
TL;DR: In this paper, optimal control techniques are applied in order to determine 2D and 3D cost-optimized flight trajectories while mitigating their climate impact by minimizing emissions and time in highly climate sensitive regions.
Abstract: Climate optimized flight trajectories are considered to be a promising measure to mitigate non-CO2 emissions' environmental impact, which is highly sensitive to locus and time of emission. Within this study, optimal control techniques are applied in order to determine 2D (lateral) and 3D (lateral and vertical) cost-optimized flight trajectories while mitigating their climate impact by minimizing emissions and time in highly climate sensitive regions. Therefore, monetary and 4D-climate cost functions, describing the climate sensitivity in dependency of the emission location, altitude, time and weather situation, are integrated into the optimization algorithm. For both, 2D- and 3D-optimization, the cost-benefit potential (climate impact mitigation vs. rise in operating costs) is investigated for nine North Atlantic routes for eastbound and westbound directions in the presence of winds. The conducted study shows large potential for both measures as the reduction of climate sensitivities often predominates the additional emissions caused by headwinds, additional climb- and descent phases, and off-design altitudes. Flight trajectories optimized within the horizontal plane can reduce the average temperature response (ATR) by approximately 15% for a two percent increase in cash operating costs (COC). This mitigation potential is signifcantly improved by superposition of lateral and vertical optimization. 3D-optimized trajectories which are comparable in costs achieve a 20-35% higher ATR reduction than their 2D-optimized counterparts. Further, they reduce global warming more e�ciently (higher ATR reduction per unit cost increment) and to a higher extent. However, achieving maximum climate impact mitigation is linked with an disproportional rise of cash operating costs in both cases. Therefore, a careful consideration of the required climate impact savings as well as the accepted surcharges is necessary.

21 citations

Proceedings ArticleDOI
25 Jun 2018
TL;DR: In this paper, the authors presented future potential markets worldwide for interurban air mobility up to 300 km, based on socio-economic factors, and provided a list of potential markets for UAM implementation.
Abstract: With respect to the growing urbanization and subsequently increasing traffic in urban areas this paper presents future potential markets worldwide for interurban air mobility up to 300 km. For this analysis a gravity model is developed to forecast interurban air passenger demand for 2042 between 4435 settlements worldwide based on socio-economic factors. The results of the study provide a list of potential markets for UAM implementation.

19 citations


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Journal ArticleDOI
TL;DR: Progress in understanding contrails since the last IPCC report is reviewed, the remaining uncertainty is assessed, and potential mitigating options and pathways forward are identified.
Abstract: Aircraft-produced contrail cirrus clouds contribute to anthropogenic climate change. Observational data sets and modelling approaches have become available that clarify formation pathways close to the source aircraft and lead to estimates of the global distribution of their microphysical and optical properties. While contrail cirrus enhance the impact of natural clouds on climate, uncertainties remain regarding their properties and lifecycle. Progress in representing aircraft emissions, contrail cirrus and natural cirrus in global climate models together with tighter constraints on the sensitivity of the climate system will help judge efficiencies of and trade-offs between mitigation options.

165 citations

01 Jan 2000
TL;DR: In this paper, a parametric study of the instantaneous radiative impact of contrails is presented using three different radiative transfer models for a series of model atmospheres and cloud parameters, including tropical, mid-latitude, and subarctic summer and winter atmospheres.
Abstract: A parametric study of the instantaneous radiative impact of contrails is presented using three different radiative transfer models for a series of model atmospheres and cloud parameters. Contrails are treated as geometrically and optically thin plane parallel homogeneous cirrus layers in a static atmosphere. The ice water content is varied as a function of ambient temperature. The model atmospheres include tropical, mid-latitude, and subarctic summer and winter atmospheres. Optically thin contrails cause a positive net forcing at top of the atmosphere. At the surface the radiative forcing is negative during daytime. The forcing increases with the optical depth and the amount of contrail cover. At the top of the atmosphere, a mean contrail cover of 0.1% with average optical depth of 0.2 to 0.5 causes about 0.01 to 0.03 Wm−2 daily mean instantaneous radiative forcing. Contrails cool the surface during the day and heat the surface during the night, and hence reduce the daily temperature amplitude. The net effect depends strongly on the daily variation of contrail cloud cover. The indirect radiative forcing due to particle changes in natural cirrus clouds may be of the same magnitude as the direct one due to additional cover.

163 citations

01 Jan 2016
TL;DR: The the art of the long view is universally compatible with any devices to read and is available in the book collection an online access to it is set as public so you can get it instantly.
Abstract: Thank you for downloading the art of the long view. Maybe you have knowledge that, people have look numerous times for their favorite readings like this the art of the long view, but end up in malicious downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they are facing with some harmful virus inside their computer. the art of the long view is available in our book collection an online access to it is set as public so you can get it instantly. Our books collection hosts in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the the art of the long view is universally compatible with any devices to read.

161 citations

Journal ArticleDOI
01 Dec 2017-Energy
TL;DR: In this article, the authors examined the necessity and the types of bio-fuels in the aviation sector, which can be used for both air and ground vehicle applications, by designing unique fuel systems for air vehicles.

153 citations

Journal ArticleDOI
TL;DR: In this paper, the authors quantified the potential for alternative jet fuel (AJF) to reduce aviation's CO2 emissions by assessing: the availability of AJF feedstock; AJF volumes that could be produced from that feedstock, and the lifecycle emissions of AJFs compared to petroleum-derived jet fuel; and the number of bio-refineries and capital investment required to achieve the calculated emission reductions.

132 citations