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  • 1
    Call number: AWI A5-24-95744
    Description / Table of Contents: The Arctic is the hot spot of the ongoing, global climate change. Over the last decades, near-surface temperatures in the Arctic have been rising almost four times faster than on global average. This amplified warming of the Arctic and the associated rapid changes of its environment are largely influenced by interactions between individual components of the Arctic climate system. On daily to weekly time scales, storms can have major impacts on the Arctic sea-ice cover and are thus an important part of these interactions within the Arctic climate. The sea-ice impacts of storms are related to high wind speeds, which enhance the drift and deformation of sea ice, as well as to changes in the surface energy budget in association with air mass advection, which impact the seasonal sea-ice growth and melt. The occurrence of storms in the Arctic is typically associated with the passage of transient cyclones. Even though the above described mechanisms how storms/cyclones impact the Arctic sea ice are in principal known, there is a lack of statistical quantification of these effects. In accordance with that, the overarching objective of this thesis is to statistically quantify cyclone impacts on sea-ice concentration (SIC) in the Atlantic Arctic Ocean over the last four decades. In order to further advance the understanding of the related mechanisms, an additional objective is to separate dynamic and thermodynamic cyclone impacts on sea ice and assess their relative importance. Finally, this thesis aims to quantify recent changes in cyclone impacts on SIC. These research objectives are tackled utilizing various data sets, including atmospheric and oceanic reanalysis data as well as a coupled model simulation and a cyclone tracking algorithm. Results from this thesis demonstrate that cyclones are significantly impacting SIC in the Atlantic Arctic Ocean from autumn to spring, while there are mostly no significant impacts in summer. The strength and the sign (SIC decreasing or SIC increasing) of the cyclone impacts strongly depends on the considered daily time scale and the region of the Atlantic Arctic Ocean. Specifically, an initial decrease in SIC (day -3 to day 0 relative to the cyclone) is found in the Greenland, Barents and Kara Seas, while SIC increases following cyclones (day 0 to day 5 relative to the cyclone) are mostly limited to the Barents and Kara Seas. For the cold season, this results in a pronounced regional difference between overall (day -3 to day 5 relative to the cyclone) SIC-decreasing cyclone impacts in the Greenland Sea and overall SIC-increasing cyclone impacts in the Barents and Kara Seas. A cyclone case study based on a coupled model simulation indicates that both dynamic and thermodynamic mechanisms contribute to cyclone impacts on sea ice in winter. A typical pattern consisting of an initial dominance of dynamic sea-ice changes followed by enhanced thermodynamic ice growth after the cyclone passage was found. This enhanced ice growth after the cyclone passage most likely also explains the (statistical) overall SIC-increasing effects of cyclones in the Barents and Kara Seas in the cold season. Significant changes in cyclone impacts on SIC over the last four decades have emerged throughout the year. These recent changes are strongly varying from region to region and month to month. The strongest trends in cyclone impacts on SIC are found in autumn in the Barents and Kara Seas. Here, the magnitude of destructive cyclone impacts on SIC has approximately doubled over the last four decades. The SIC-increasing effects following the cyclone passage have particularly weakened in the Barents Sea in autumn. As a consequence, previously existing overall SIC-increasing cyclone impacts in this region in autumn have recently disappeared. Generally, results from this thesis show that changes in the state of the sea-ice cover (decrease in mean sea-ice concentration and thickness) and near-surface air temperature are most important for changed cyclone impacts on SIC, while changes in cyclone properties (i.e. intensity) do not play a significant role.
    Type of Medium: Dissertations
    Pages: VIII, 131 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2024 , Contents 1 Introduction 1.1 The Arctic sea-ice cover 1.1.1 Sea ice in the coupled Arctic climate system 1.1.2 Recent changes of the Arctic sea ice 1.2 The atmosphere as driver of sea-ice variability 1.2.1 Large-scale circulation patterns 1.2.2 Role of cyclones 1.3 Thesis structure and research questions 2 Theory and methods 2.1 Synoptic cyclones 2.1.1 Related fundamentals of atmospheric dynamics 2.1.2 Cyclone activity in the Arctic 2.2 Cyclone tracking and cyclone occurrence mask 2.3 Dynamic and thermodynamic sea-ice variability related to cyclones 3 New insights into cyclone impacts on sea ice in the Atlantic sector of the Arctic Ocean in winter 3.1 Abstract 3.2 Introduction 3.3 Data and methods 3.3.1 Database and cyclone identification 3.3.2 Quantification of cyclone impacts on SIC 3.4 Cyclone impacts on SIC 3.4.1 Effects of different time scales and regions 3.4.2 Effects of SIC conditions and cyclone depth 3.4.3 Spatial variability of SIC response to cyclones 3.4.4 Relation to near-surface wind and surface energy budget 3.5 Signature of ’New Arctic’ conditions 3.6 Conclusions 3.7 Supplementary material 4 Impact of three intense winter cyclones on the sea ice cover in the Barents Sea: A case study with a coupled regional climate model 4.1 Abstract 4.2 Introduction 4.3 Data and methods 4.3.1 HIRHAM–NAOSIM simulation 4.3.2 Supplementary evaluation data 4.3.3 Dynamic and thermodynamic contributions to sea-ice changes 4.4 Results 4.4.1 Cyclone cases 4.4.2 Cyclone impacts on SEB 4.4.3 Cyclone impacts on sea-ice concentration (SIC) 4.4.4 Cyclone impacts on sea-ice thickness (SIT) 4.4.5 Context to other cyclone cases during the MOSAiC winter 4.5 Discussion and conclusions 4.6 Supplementary material 5 Cyclone impacts on sea ice concentration in the Atlantic Arctic Ocean: Annual cycle and recent changes 5.1 Abstract 5.2 Introduction 5.3 Data and methods 5.4 Changes in cyclones and traversed sea ice 5.5 Cyclone impacts on SIC 5.5.1 Annual cycle in the old Arctic 5.5.2 Changes in the new Arctic 5.5.3 Regional changes in autumn 5.6 Conclusions 5.7 Supplementary material 6 Conclusions and Outlook 6.1 What is the statistical impact of cyclone passages on sea-ice concentration (SIC) in the Atlantic Arctic Ocean? 6.2 What are the individual contributions of dynamic and thermodynamic processes to sea-ice changes related to cyclones? 6.3 Do the SIC impacts of cyclones change in a warming Arctic and what are the related mechanisms? 6.4 Ways forward Appendix: Cyclones modulate the control of the North Atlantic Oscillation on transports into the Barents Sea Bibliography
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Publication Date: 2023-07-21
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The use of novel battery technologies in short‐haul electric aircraft can support the aviation sector in achieving its goals for a sustainable development. However, the production of the batteries is often associated with adverse environmental and socio‐economic impacts, potentially leading to burden shifting. Therefore, this paper investigates alternative technologies for lithium–sulfur all‐solid‐state batteries (LiS‐ASSBs) in terms of their contribution to the sustainable development goals (SDGs). We propose a new approach that builds on life cycle sustainability assessment and links the relevant impact categories to the related SDGs. The approach is applied to analyze four LiS‐ASSB configurations with different solid electrolytes, designed for maximum specific energy using an electrochemical model. They are compared to a lithium–sulfur battery with a liquid electrolyte as a benchmark. The results of our cradle‐to‐gate analysis reveal that the new LiS‐ASSB technologies generally have a positive contribution to SDG achievement. However, the battery configuration with the best technical characteristics is not the most promising in terms of SDG achievement. Especially variations from the technically optimal cathode thickness can improve the SDG contribution. A sensitivity analysis shows that the results are rather robust against the weighting factors within the SDG quantification method.〈/p〉
    Description: Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ‐ EXC 2163/1‐ Sustainable and Energy Efficient Aviation
    Keywords: ddc:363.7 ; all‐solid‐state battery ; electric aircraft ; industrial ecology ; life cycle sustainability assessment ; prospective sustainability assessment ; sustainable development goals
    Language: English
    Type: doc-type:article
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  • 3
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    International journal of physical distribution and logistics management 35 (2005), S. 337-361 
    ISSN: 0960-0035
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Purpose - Owing to new legal requirements, essential changes in the field of treatment of electronic products in Germany are expected. However, consequences in terms of changes of organisation and material flows of the German treatment system are currently unknown. Thus, the objective of this contribution is to predict relevant changes occurring in this context. This lays the framework for a deduction of recommendations for political decision makers and actors of the treatment system. Design/methodology/approach - Within this contribution, a linear, activity-based model is presented, optimising the allocation of discarded products, disassembly activities and disassembly fractions to actors of the treatment system. Parameter and model modifications allow forecasting of future developments. In a case study, the model is then applied to Lower Saxony, a federal state of Germany. This allows a validation of the model as well as an evaluation of future scenarios. Findings - Based on this analysis, impacts of new legal and economic developments on the treatment of discarded electronic products are predicted. Conclusions and recommendations for political decision makers as well as for existing disassembly companies are drawn. Originality/value - The findings of this paper allow an estimation of the impacts of new legal regulations on the existing infrastructure for treatment of electrical devices in Germany. The applied methodology can be assigned to additional product categories and can be enhanced regarding the system boundary.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 20 (1998), S. 199-211 
    ISSN: 1436-6304
    Keywords: Lebenszykluskosten ; Demontage- und Recyclingplanung ; Fuzzy Lineare Optimierung ; Fallstudie: Elektronikschrott ; Life cycle costs ; Dismantling and recycling planning ; Fuzzy Linear Programming ; Case study: electronic scrap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Abstract Following the new German recycling and waste management act, producers are responsible for their products during the whole life-cycle. They have to take back and recycle their products at the end of their service life. Therefore, the resulting redistribution, dismantling and recycling costs have to be included into the life-cycle costs. Due to long service lifes of most industrial products, the available dismantling and recycling techniques and capacities in future, as well as the resulting costs, are difficult to determine. In this paper, a Fuzzy Linear Programming model for the minimization of dismantling and recycling costs at the end of the lifetime of industrial products is developed. With the help of the presented approach, companies will be enabled to estimate and integrate future recycling costs into the life-cycle costs and to influence them already in the development stage of their products.
    Notes: Zusammenfassung Mit der Verabschiedung des Kreislaufwirtschafts- und Abfallgesetzes (KrW-/AbfG) hat der Gesetzgeber die Produktverantwortung über den gesamten Lebenszyklus dem Hersteller übertragen. Dieser ist zukünftig verpflichtet, die von ihm hergestellten Produkte am Ende ihrer Lebensdauer zurückzunehmen und einem qualitativ hochwertigen Recycling zuzuführen. Zur frühzeitigen Ermittlung der entscheidungsrelevanten Lebenszykluskosten sind somit die Kosten zur Demontage und Verwertung der demontierten Baugruppen und Bauteile bereits in der Phase der Produktentwicklung abzuschätzen. Die in dieser Phase vorliegende Planungsunsicherheit hinsichtlich der zukünftigen technischen und wirtschaftlichen Rahmenbedingungen kann mit Hilfe der Fuzzy Set Theorie berücksichtigt werden. Im vorliegenden Beitrag erfolgt daher die Modellierung der zukünftig zu internalisierenden Demontage- und Recyclingkosten mit Hilfe der Fuzzy Linearen Optimierung. Unternehmen werden damit in die Lage versetzt, zukünftige Recyclingkosten ihrer sich in der Entwicklung befindlichen Produkte bereits frühzeitig abschätzen und gezielt beeinflussen zu können.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 20 (1998), S. 199-211 
    ISSN: 1436-6304
    Keywords: Schlüsselwörter: Lebenszykluskosten – Demontage- und Recyclingplanung – Fuzzy Lineare Optimierung – Fallstudie: Elektronikschrott ; Key words: Life cycle costs – Dismantling and recycling planning – Fuzzy Linear Programming – Case study: electronic scrap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Abstract. Following the new German recycling and waste management act, producers are responsible for their products during the whole life-cycle. They have to take back and recycle their products at the end of their service life. Therefore, the resulting redistribution, dismantling and recycling costs have to be included into the life-cycle costs. Due to long service lifes of most industrial products, the available dismantling and recycling techniques and capacities in future, as well as the resulting costs, are difficult to determine. In this paper, a Fuzzy Linear Programming model for the minimization of dismantling and recycling costs at the end of the lifetime of industrial products is developed. With the help of the presented approach, companies will be enabled to estimate and integrate future recycling costs into the life-cycle costs and to influence them already in the development stage of their products.
    Notes: Zusammenfassung. Mit der Verabschiedung des Kreislaufwirtschafts- und Abfallgesetzes (KrW-/AbfG) hat der Gesetzgeber die Produktverantwortung über den gesamten Lebenszyklus dem Hersteller übertragen. Dieser ist zukünftig verpflichtet, die von ihm hergestellten Produkte am Ende ihrer Lebensdauer zurückzunehmen und einem qualitativ hochwertigen Recycling zuzuführen. Zur frühzeitigen Ermittlung der entscheidungsrelevanten Lebenszykluskosten sind somit die Kosten zur Demontage und Verwertung der demontierten Baugruppen und Bauteile bereits in der Phase der Produktentwicklung abzuschätzen. Die in dieser Phase vorliegende Planungsunsicherheit hinsichtlich der zukünftigen technischen und wirtschaftlichen Rahmenbedingungen kann mit Hilfe der Fuzzy Set Theorie berücksichtigt werden. Im vorliegenden Beitrag erfolgt daher die Modellierung der zukünftig zu internalisierenden Demontage- und Recyclingkosten mit Hilfe der Fuzzy Linearen Optimierung. Unternehmen werden damit in die Lage versetzt, zukünftige Recyclingkosten ihrer sich in der Entwicklung befindlichen Produkte bereits frühzeitig abschätzen und gezielt beeinflussen zu können.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1634-1638 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 1999-06-01
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 8
    Publication Date: 2005-06-01
    Print ISSN: 2191-4761
    Electronic ISSN: 2191-477X
    Topics: Economics
    Published by Springer
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  • 9
    Publication Date: 2016-12-19
    Print ISSN: 0894-8755
    Electronic ISSN: 1520-0442
    Topics: Geography , Geosciences , Physics
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  • 10
    Publication Date: 2016-11-07
    Print ISSN: 0027-0644
    Electronic ISSN: 1520-0493
    Topics: Geography , Geosciences , Physics
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