ALBERT

Note: Zugl.: Freiburg, Univ., Diss., 2004

Note: Hannover, Univ., Diss., 2004

Note: Zugl.: Bremen, Univ., Diss., 2004

Note: TABLE OF CONTENTS: ACKNOWLEDGEMENTS. - PREFACE. - INTRODUCTION. - SYMBOLS AND NOTATION. - PART I. FUNDAMENTAL PHYSICS AND MATERIALS TECHNOLOGY OF ICE. - 1.General Concepts. - 1. Introduction. - 2. Equations of Balance. - 3. Material Response. - (a) General constitutive relations, simple materials. - (b) The rule of material objectivity. - (c) Material symmetry. - (d) Constitutive response for isotropie bodies. - (e) Materials with bounded memory-some constitutive representations. - (f) Incompressibility. - (g) Some representations of isotropic functions. - 4. The Entropy Principle. - (a) The viscous heat-conducting compressible fluid. - (b) The viscous heat-conducting incompressible fluid. - (c) Pressure and extra stress as independent variables. - (d) Thermoelastic solid. - (e) Final remarks. - 5. Phase Changes. - (a) Phase changes for a viscous compressible heat-conducting fluid. - (b) Phase changes for a viscous incompressible heat-conducting fluid. - References. - 2. A Brief Summary of Constitutive Relations for Ice. - 1. Preliminary Remarks. - 2. The Mechanical Properties of Hexagonal Ice. - (a) The crystal structure of ordinary ice. - (b) The elastic behavior of hexagonal ice. - (c) The inelastic behavior of single-crystal ice. - 3. The Mechanical Properties of Polycrystalline Ice. - (a) The elastic behavior of polycrystalline ice. - (b) Linear viscoelastic properties of polycrystalline ice. - (α) General theory. - (β) Experimental results. - (c) Non-linear viscous deformation and creep. - (α) Results of creep tests. - (β) Generalization to a three-dimensional flow law. - (γ) Other flow laws. - 4. The Mechanical Properties of Sea Ice. - (a) The phase diagram of standard sea ice and its brine conten. - (b) Elastic properties. - (c) Other material properties. - References. - PART II. THE DEFORMATION OF AN ICE MASS UNDER ITS OWN WEIGHT. - 3. A Mathematical Ice-flow Model and its Application to Parallel-sided Ice Slabs. - 1. Motivation and Physical Description. - 2. The Basic Model - Its Field Equations and Boundary Conditions. - (a) The field equations. - (α) Cold ice region. - (β) Temperate ice region. - (b) Boundary conditions. - (α) At the free surface. - (β) Along the ice-water interface. - (γ) Along the bedrock surface. - (δ) Along the melting surface. - 3. The Response of a Parallel-sided Ice Slab to Steady Conditions. - (a) Dimensionless forms of the field equations. - (b) Parallel-sided ice slab, a first approximation to glacier and ice-shelf flow dynamics. - (α) Velocity and temperature fields x-independent. - (β) Extending and compressing flow. - (γ) Floating ice shelves 4. Concluding Remark. - References. - 4. Thermo-mechanical Response of Nearly Parallel-sided Ice Slabs Sliding over their Bed. - 1. Motivation. - 2. The Basic Boundary-value Problem and its Reduction to Linear Form. - 3. The Solution of the Boundary-value Problems. - (a) Zeroth-order problem. - (b) First-order problem. - (α) Harmonic perturbation from uniform flow for a zero accumulation rate. - (β) Analytic solution for a Newtonian fluid. - (γ) Numerical solution for non-linear rheology. - (δ) Effect of a steady accumulation rate. - (ε) A historical note on a previous approach. - (η) The first-order temperature problem. - (c) Numerical results for steady state. - (α) Transfer of bottom protuberances to the surface. - (β) Basal stresses. - (γ) Surface velocities. - (δ) Effect of a steady accumulation rate. - 4. Remarks on Response to a Time-dependent Accumulation Rate. - 5. Surface-wave Stability Analysis. - (a) The eigenvalue problem. - (b) Discussion of results. - 6. Final Remarks. - References. - 5. The Application of the Shallow-ice Approximation. - 1. Background and Previous Work. - 2. Derivation of the Basal Shear-stress Formula by Integrating the Momentum Equations over Ice Thickness. - (a) Derivation. - (b) The use of the basal shear-stress formula in applied glaciology. - 3. Solution of the Ice-flow Problem using the Shallow-ice Approximation. - (a) Governing equations. - (b) Shallow-ice approximation. - (c) Construction of the perturbation solution. - (d) Results. - (e) Temperature field. - 4. Theoretical Steady-state Profiles. - (a) Earlier theories and their limitations. - (b) Surface profiles determined by using the shallow-ice approximation. - 5. An Alternative Scaling - a Proper Analysis of Dynamics of Ice Sheets with Ice Divides. - (a) Finite-bed inclination. - (b) Small-bed inclination. - (c) Illustrations. - References. - 6. The Response of a Glacier or an Ice Sheet to Seasonal and Climatic Changes. - 1. Statement of the Problem. - 2. Development of the Kinematic Wave Theory. - (a) Full non-linear theory. - (b) Perturbation expansion-linear theory. - (c) An estimate for the coefficients C and D. - (d) Boundary and initial conditions. - 3. Theoretical Solutions for a Model Glacier. - (a) Solutions neglecting diffusion. - (b) Theoretical solutions for a diffusive model. - (α) Coefficient functions for the special model. - (β) Solution for a step function. - (γ) General solution for uniform accumulation rate. - (δ) The inverse problem - calculation of climate from variations of the snout. - 4. General Treatment for an Arbitrary Valley Glacier. - (a) Fourier analysis in time. - (α) Low-frequency response. - (β) High-frequency response. - (γ) Use of the results. - (b) Direct integration methods. - 5. Derivation of the Surface-wave Equation from First Principles Non-linear Theory. - (a) Surface waves in the shallow-ice approximation. - (α) Integration by the methods of characteristics. - (β) An illustrative example. - (γ) A remark on linearization. - (δ) Effects of diffusion. - (b) Remarks regarding time-dependent surface profiles in ice sheets. - (c) Long waves in an infinite ice slab - Is accounting for diffusion enough?. - (α) Basic equations. - (β) Construction of perturbation solutions. - (γ) Numerical results. - 6. Concluding Remarks. - References. - 7. Three-dimensional and Local Flow Effects in Glaciers and Ice Sheets. - 1. Introduction. - 2. Effect of Valley Sides on the Motion of a Glacier. - (a) Solutions in special cases. - (α) Exact solutions for the limiting cases. - (β) Solution for a slightly off-circular channel. - (γ) A note on very deep and wide channels. - (b) A useful result for symmetrical channels with no boundary slip. - (c) Numerical solution - discussion of results. - 3. Three-dimensional Flow Effects in Ice Sheets. - (a) Basic equations. - (b) Decoupling of the stress-velocity problem from the problem of surface profile. - (c) The equation describing the surface geometry. - (d) The margin conditions. - 4. Variational Principles. - (a) Fundamental variational theorem. - (b) Variational principle for velocities. - (c) Reciprocal variational theorem. - (d) Maximum and minimum principles. - (e) Adoption of the variational principles to ice problems. - 5. Discussion of Some Finite-element Solutions. - References. - Appendix: Detailed Calculations Pertaining to Higher-order Stresses in the Shallow-ice Approximation. - AUTHOR INDEX. - SUBJECT INDEX.

Note: Contents Introduction 1. Isotope hydrology: a historical perspective / P.K. Aggarwal, K. Froehlich, R. Gonfiantini, J.R. Gat ISOTOPIC AND NUCLEAR METHODOLOGIES 2. Isotopic tracers for obtaining hydrologic parameters / H. Moser, W. Rauert 3. Hydrologic process studies using radionuclides produced by cosmic rays / D.Lal 4. Stable oxygen and hydrogen isotopes / L.L. Gourcy, M. Groening, P.K. Aggarwal 5. Tritium in the hydrologic cycle / R.L. Michel 6. Assessing sources and transformations of sulphate and nitrate in the hydrosphere using isotope techniques / B. Mayer 7. Rare gases / H.H. Loosli, R. Purtschert 8. U and Th series nuclides in natural waters / A. Kaufman 9. Optical isotope ratio measurements in hydrology / E.R.Th. Kerstel, H.A.J. Meijer HYDROLOGIC PROCESSES AND SYSTEMS 10. Some classical concepts of isotope hydrology / J.R. Gat 11. Istotopes in lake studies: a historical perspective / K.Froehlich, R. Gonfiantini, K. Rozanski 12. A review of isotope applications in catchment hydrology / T. Vitvar, P.K. Aggarwal, J.J. McDonnell 13. Contribution of isotopic and nuclear tracers to study of groundwaters / W.M. Edmunds 14. Dating of young groundwater / LN. Plummer 15. Dating of old groundwater - history, potential, limits and future / M.A. Geyh 16. Geotermal systems / Y.K. Kharaka, R.H. Mariner 17. Saline waters / J. Horita HYDROLOGIC PROCESSES AND SYSTEMS 18. Isotopes in atmospheric moisture / K. Rozanski 19. How much climatic information do water isotopes contain? / G. Hoffmann, M. Cuntz, J. Jouzel, M. Werner 20. Stable isotopes through the holocene as recorded in low-latitude, high-altitude ice cores / L.G. Thompson, M.E. Davis 21. Groundwater as an archive of climatic and environmental change / W.M. Edmunds 22. Isotopic palaeolimnology / F. Gasse Appendices A. List of seminal papers on isotope hydrology (the isotopes of hydrogen and oxygen) B. List of papers presented at the 1st IAEA Symposium on Isotope Hydrology (Tokyo, 1963) C. Excerpts from report of 1st IAEA Panel on the Application of Isotope Techniques in Hydrology

Note: Zugl.:Bremen, Univ., Diss., 2004

Note: Zugl.: Freiburg, Univ., Diss., 2004

Note: Contents: Preface. - Acknowledgements. - List of Abbreviations. - 1 The evolution of knowledge about the Arctic and its climate. - 1.1 Historical exploration. - 1.2 The beginning of systematic observations. - 1.3 The modern era. - 2 Physical characteristics and basic climatic features. - 2.1 The Arctic ocean. - 2.2 The Arctic lands. - 2.3 Basic climatic elements. - 3 The basic atmospheric heat budget. - 3.1 The Arctic and the global heat budget. - 3.2 The basic Arctic heat budget. - 3.3 Further analysis of Fwall. - 4 The atmospheric circulation. - 4.1 Historical perspective. - 4.2 The stratospheric circulation. - 4.3 The Arctic tropopause. - 4.4 The mid-tropospheric circulation. - 4.5 Surface and near-surface circulation. - 4.6 Polar Lows. - 5 The surface energy budget. - 5.1 The energy balance equations. - 5.2 The downward solar radiation flux. - 5.3 Surface albedo. - 5.4 Longwave radiation fluxes. - 5.5 Distribution of net radiation. - 5.6 Cloud radiative forcing. - 5.7 Radiation fluxes from surface observations: examples from SHEBA. - 5.8 Partitioning of net radiation. - 5.9 Skin temperature, SAT and vertical structure. - 5.10 Radiation-climate feedbacks. - 6 Precipitation, net precipitation and river discharge. - 6.1 Precipitation. - 6.2 Evapo-transpiration and net precipitation. - 6.3 Mean annual cycles for the major terrestrial drainages. - 6.4 River discharge and runoff. - 7 Arctic ocean-sea ice-climate interactions. - 7.1 Sea ice formation, growth and melt. - 7.2 Mean circulation, ice zones and concentration. - 7.3 Sea ice motion. - 7.4 Examples of large-scale ocean-sea ice-climate interactions. - 7.5 The Fram Strait outflow and the thermohaline circulation. - 8 Climate regimes of the Arctic. - 8.1 The Greenland Ice Sheet. - 8.2 Polar desert. - 8.3 Maritime Arctic. - 8.4 Central Arctic Ocean. - 8.5 Mountains and uplands. - 8.6 Urban modifications of local climate. - 9 Modeling the Arctic climate system. - 9.1 General model types. - 9.2 Single-column models. - 9.3 Land surface models. - 9.4 Sea ice and ice-ocean models. - 9.5 Global climate models. - 9.6 Regional climate models. - 9.7 Numerical weather prediction models. - 9.8 Ecosystem models. - 9.9 Summary of model errors. - 10 Arctic paleoclimates. - 10.1 The distant past. - 10.2 Paleoclimate records for the Quaternary. - 10.3 Features of the Quaternary. - 10.4 Rapid climate shifts. - 10.5 Regional aspects of the LGM. - 10.6 Deglaciation. - 10.7 The Holocene. - 11 Recent climate variability, trends and the future. - 11.1 Setting the stage. - 11.2 Summary of observed variability and change. - 11.3 The NAO and AO. - 11.4 The NAO/AO framework: merits and shortcomings. - 11.5 Related multiyear climate variability. - 11.6 The future. - References. - List of selected websites. - Index.

Note: Zugl.: Berlin, Freie Univ., Diss., 2005