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  • 1
    Publication Date: 2023-08-29
    Description: Detailed knowledge about the thermal properties of rocks containing gas hydrate is required in order to quantify processes involving the formation and decomposition of gas hydrate in nature. This work investigates the influence of methane hydrate on the transport of heat in hydrate-bearing rocks. Both the thermal conductivity of gashydrate bearing sediments and the thermal effects of phase transitions are analyzed. In the framework of the Mallik 2002 program three wells penetrating a continental gas hydrate occurrence under permafrost were successfully equipped with permanent fiberoptic distributed temperature sensing cables. Temperature data were collected over a period of 21 months after completion of the wells. The analysis of the disturbed well temperatures after drilling revealed a strong effect of phase transitions on temperature changes. For the first time, the effects of induced temperature changes within a gas hydrate deposit were monitored in-situ. The resulting temperature gradient anomalies could be successfully utilized to determine the base of the gas hydrate occurrences and the permafrost layer at about 1103-1104±3.5 m and 599-604±3.5 m below ground level respectively. At the end of the 21-month observation period, the well temperature returned close to equilibrium with the formation temperature. At the base of the gas hydrate occurrences a temperature of 12.3 ◦C was measured, which is about 0.7 K below the stability temperature predicted by thermodynamic calculations considering a pressure gradient of 10.12 kPa m〈sup〉−1〈/sup〉 and a sea-water salinity of 35 ppt. Under the stated conditions, the base of the stability zone of methane hydrate at Mallik would lie at about 1140 m below ground level. Thermal conductivity profiles were calculated from the geothermal data as well as from a petrophysical model derived from the available logging data and application of mixing-law models. The results indicate, that variations of thermal conductivity are mainly lithologically controlled with a minor influence from hydrate saturation. The results of the geometric mean model showed the best agreement to the thermal conductivity profiles derived from geothermal data. Average thermal conductivity values of the hydrate-bearing intervals range between 2.35 W m〈sup〉−1〈/sup〉 K〈sup〉−1〈/sup〉 and 2.77 W m〈sup〉−1〈/sup〉 K〈sup〉−1〈/sup〉 . A simplified numerical model of conductive heat flow was set up in order to assess the temperature effect of phase transitions within the gas hydrate bearing strata. Within the model the mobilization of latent heat during the phase transition was considered (enthalpy method), taking into account the stability conditions for methane hydrate at Mallik (pressure, temperature, pore fluid and gas phase composition) as well as effects of hydrate decomposition on the thermal rock properties. The modelling results indicate, that the regeneration of hydrate after the recovery of stability conditions is inhibited.
    Description: thesis
    Keywords: ddc:551 ; gas hydrate
    Language: English
    Type: doc-type:book , publishedVersion
    Format: application/pdf
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  • 2
    Call number: AWI G3-23-94993
    Type of Medium: Monograph available for loan
    Pages: 24 Seiten , Illustrationen
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
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    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    In:  IUGG Annual Report
    Publication Date: 2023-03-02
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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  • 4
    Journal available for loan
    Journal available for loan
    Tübingen : Mohr Siebeck ; 1.1884 - 48.1931; N.F. 1.1932/33 - 10.1943/44(1945),3; 11.1948/49(1949) -
    Call number: ZS 22.95039
    Type of Medium: Journal available for loan
    Pages: Online-Ressource
    ISSN: 1614-0974 , 0015-2218 , 0015-2218
    Language: German , English
    Note: N.F. entfällt ab 57.2000. - Volltext auch als Teil einer Datenbank verfügbar , Ersch. ab 2000 in engl. Sprache mit dt. Hauptsacht.
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  • 5
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    Wuppertal : Wuppertal Institute for Climate, Environment and Energy | Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
    Publication Date: 2022-11-10
    Description: Objective of this study is to support the development of a Thematic Strategy for Sustainable Use and Management of Resources through the provision of background information, in particular "an estimate of materials and waste streams in the Community, including imports and exports" (Article 8 a 6th EAP) using the method of material flow accounting. It further presents first ideas on how the resource use pattern of the EU can be assessed with regards to priority setting for possible policy measures. By referring to the concept of Industrial Metabolism, resources are defined in a broad sense, embracing the source and sink function of the natural environment, i.e. the provision of raw materials and land, and the absorption of residual materials (waste and emissions). Environmental impacts are associated not only with the extraction, harvesting and catching of raw materials but also with the subsequent production, use and disposal of products and goods. It is the total of environmental impacts associated with the entire life cycle of raw materials which has to be considered. Three generic "management rules" for the sustainable use and management of renewable and non-renewable natural resources are presented and discussed which have been formulated by several political institutions based on scientific literature: 1. The use of renewable resources should not exceed their renewal and/or regeneration rates. 2. The use of non-renewable resources should not exceed the rate at which substitutes are developed (should be limited to levels at which they can either be replaced by physically or functionally equivalent renewable resources or at which consumption can be offset by increasing the productivity of renewable or non-renewable resources). 3. Outputs of substances to the environment (pollution) should not exceed the assimilative capacity of environmental media ("absorption capacities").
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: report , doc-type:report
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  • 6
    Call number: MR 22.94956
    Type of Medium: Monograph available for loan
    Pages: XIX, 402 Seiten , Illustrationen, graphische Darstellungen, Karten
    ISBN: 952-10-0868-7
    Series Statement: Lithos 80.2005,1/4
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 7
    Monograph available for loan
    Monograph available for loan
    St. John's : Geological Association of Canada
    Associated volumes
    Call number: MR 22.94913
    In: Short course notes / Geological Association of Canada, 17
    Type of Medium: Monograph available for loan
    Pages: x, 352 Seiten , Illustrationen, graphische Darstellungen, Karten
    ISBN: 1-897095-08-2
    Series Statement: Short course notes / Geological Association of Canada 17
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 8
    Monograph available for loan
    Monograph available for loan
    New Dehli : New Age International Publishers
    Call number: AWI Bio-22-94883
    Type of Medium: Monograph available for loan
    Pages: XI, 349 Seiten , Illustrationen
    Edition: Reprint 2005
    ISBN: 0470213590 , 085226240X , 81-224-1343-9
    Language: English
    Note: Contents Foreword, by Professor Dr. Martin Bopp Preface Acknowledgements 1. EXPERIMENTS ON SPORES AND GEMMAE Spore Germination in Liverwort - Jungermanniales, Marchantiales, Anthocerotales, Sphaerocarpales; Types of Spore Germination in Mosses - Sphagnales, Andreaeales, Tetraphidales, Bryales Factors Affecting Spore Germination - Light, Temperature, Sugars, Minerals, Growth Regulators, Hydrogen-ion concentration (pH), OtheT Factors Mechanism of Spore Germination Experiments on Gemmae - light, Temperature, Humidity and other Physical Factors, Growth Regulators, Nitrogenous Substances, Hydrogen-ion concentration (pH), Other Chemical Factors References 2. PROTONEMAL DIFFERENTIATION AND BUD FORMATION IN MOSSES Protonemal Differentiation Bud Formation Factors Affecting Bud Formation - Light, Temperature, Auxins, Cytokinins, Gibberellins, Adenosine 3', 5'-cyclic monophosphate, Adenine and Amino Acids, Minerals and Chelates Vitamins, Abscisic Acid, Sugars, pH, Influence of Other Organisms References. 3. REGENERATION Potentialities of Various Organs for Regeneration - Regeneration from Leaves, Regeneration from Setae Morphology of Régénérants Factors Affecting Regeneration - Light. Radiation, pH, Season, Humidity. Wounding, Temperature, Size of the Fragment Reserve Food Material. Location in the Plant, Age, Correlative Inhibition. Polarity and Apical Dominance Changes Occurring in Regenerating Cells References 4. REPRODUCTIVE BIOLOGY Factors Affecting Gametangial Induction - Light Duration, Light Level, Light Quality. Temperature, Temperature-Photoperiod Interaction. Humidity. Hydration. Carbohydrates. Nitrogenous Substances, Growth Regulators, Chelating Agents, pH and Other Factors References 5. ALTERNATIVE PATHWAYS IN LIFE CYCLE Apogamy - Occurrence of Apogamy in Diplophase and Haplophase, Spore Production in Apogamous Sporophytes, Differentiation of Apogamous Sporophytes from Callus, Factors Controlling Differentiation of Apogamous Sporophytes: Exogenous Factors, Endogenous Factors, Differentiation of Sporophyte and Gametophyte, Role of Calyptra in Sporogon Development Apospory Callus Formation and its Differentiation - Formation of Callus. Differentiation in Callus Controls in Differentiation Alternation of Generations References 6. PHOTOMORPHOGENESIS Spore Germination - Liverworts, Mosses Growth - Liverworts, Mosses Vegetative Propagation - Liverworts, Mosses Metabolism - Liverworts. Mosses; Senescence Bud Induction in Mosses Tropic Responses - Liverworts, Mosses References. 7. ULTRASTRUCTURAL STUDIES Spore Protonema Stem Leaf Gametangia - Antheridium Gametogenesis - Spermatogenesis, Oogenesis Sporogenesis - Spore Sac or Tapetum. Fluctuation in Plastid Number, Structural Changes in Plastids, Cytoplasm, and Other Organelles. Meiosis. Spore Wall Formation Sporophyte-Ganietophyte Junction Seta Histoenzymological Studies - Localization of Enzymes in the Haustorial Foot References 8. CHEMICAL CONSTITUENTS OF BRYOPHYTES Antibiotics Growth Substances - Specified Growth Substances, Non-specified Growth Substances Lipids - Alkanes, Fatty Acids, Cuticular Components Terpenoids - Monoterpenoids, Sesquiterpenoids, Ditetpenoids, Triterpenoids and Sterols Flavonoids - Flavones, Isoflavones, Flavonols, Dihydrofiavonoids and Biflavonyls, Aurones and Chalcones, Acylated Flavonoids, Anthocyanins and Proanthocyanidins, Sphagnorubins Lignins; Other Constitutents - Carotenoids, Carbohydrates, Organic Acids, Dihydrostilbenes, Enzymes, Amino Acids and Quinones, Inorganic Compounds, Miscellaneous, Antitumour Activities, Allergenic Activities References 9. BRYOPHYTES AS INDICATORS OF POLLUTION Heavy Metals - Lead, Cadmium, Zinc, Mercury, Arsenates, Chromium, Nickel. Vanadium Stability Pattern of Metal Ions Metal Tolerance - Copper Mosses, Peat Mosses Gaseous Pollutants - Sulphur dioxide. Fluorides, Ozone Radionuclides (Radio Isotopes) - Cesium. Strontium, Uranium; Radiations References. 10. PROTOPLAST CULTURE Isolation of Protoplasts - Mechanical Method, Enzymatic Method, Source Material for Protoplasts, Factors Affecting Protoplast Isolation: Culture of Protoplasts—Liquid Culture Agar Plating of Protoplasts: Regeneration of Protoplasts - Factors Affecting Regeneration Protoplast Fusion and Somatic Hybrids Induction and Isolation of Mutants References. 11. CONDUCTION IN BRYOPHYTES External Conduction - Gametophyte. Sporophyte, Significance of External Conduction Internal Conduction - Cells Involved in Conduction, Anatomy of the Horizontal Axis, Midribs and Leaf Traces. Conducting Strand in Seta and Capsule, Development and Structure of Mature Conducting Tissues. The Interphase, Internal Conduction of Water, Conduction of Organic Compounds; Evolutionary Trends in the Conducting Strands References. 12. WATER RELATIONS Absorption and Conduction of Water - Endohydric.' Ectohydric, Myxohydric Water Holding Capacity and Growth Rate Desiccation and Rehydration Mechanism of Damage Growth-Forms References SUBJECT INDEX PLANT INDEX AUTHOR INDEX
    Location: AWI Reading room
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  • 9
    Publication Date: 2022-02-18
    Description: The first Meeting of the Parties to the Kyoto Protocol (MOP 1) took place from 28 November to 10 December 2005 in Montreal, in conjunction with the eleventh meeting of the Conference of the Parties to the Framework Convention on Climate Change (COP 11). This meeting signifies a successful start into a new era of international climate policy: The Kyoto Protocol, which in the past had been sometimes declared as being dead, has become operational. The challenges of the meeting were framed along the "Three Is", Implementation, Improvement and Innovation. The first challenge (Implementation) entailed in particular the adoption of the Marrakesh Accords, the agreements reached at COP 7 in Marrakesh that set out the detailed rules for making the Kyoto Protocol operational. The second challenge (Improvement) referred to improving the work of the Framework Convention and the Kyoto Protocol in the near future. The third and most important challenge (Innovation) referred to the further evolution of the regime. This article by Bettina Wittneben, Wolfgang Sterk, Hermann E. Ott und Bernd Brouns provides an account of the main developments in Montreal along the lines of the "Three Is". The paper concludes with an assessment and outlook on international climate policy.
    Keywords: ddc:320
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: article , doc-type:article
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  • 10
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    Wuppertal : Wuppertal Institute for Climate, Environment and Energy | Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
    Publication Date: 2022-02-18
    Description: In this brochure, WISIONS focuses on the significance of innovative strategies in the field of sustainable transport. WISIONS presents a number of projects from around the globe that have been successfully implemented, with the intention of further promoting the particular approaches used by these projects. Using a key number of internationally accepted criteria, the main consideration for selection of the projects was energy and resource efficiency, but social aspects such as the inclusion of local population were also of relevance. The assessment of the projects also included the consideration of regional factors acknowledging different needs and potentials.
    Keywords: ddc:380
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: report , doc-type:report
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