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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Artificial satellites in earth sciences. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (509 pages)
    Edition: 1st ed.
    ISBN: 9780080516585
    Series Statement: Issn Series ; v.Volume 69
    DDC: 551.46/0028
    Language: English
    Note: Cover -- Contents -- Contributors -- Preface -- Chapter 1. Satellite Altimetry -- 1. Introduction -- 2. Radar Measurement Principles -- 3. Range Estimation -- 4. Precision Orbit Determination -- 5. Geophysical Effects on the Sea Surface Topography -- 6. Significant Wave Height Estimation -- 7. Wind-Speed Estimation -- 8. TOPEX/POSEIDON Mission Design and Performance -- 9. Outlook for Future Altimeter Missions -- Acknowledgments -- References -- Chapter 2. Large-Scale Ocean Circulation -- 1. Introduction -- 2. The Ocean General Circulation -- 3. The Temporal Variability -- 4. Conclusions -- Acknowledgments -- References -- Chapter 3. Ocean Currents and Eddies -- 1. Introduction -- 2. Altimeter Data Processing for Mesoscale Studies -- 3. Ocean Currents -- 4. Mesoscale Eddies -- 5. Conclusions -- Acknowledgments -- References -- Chapter 4. Tropical Ocean Variability -- 1. Introduction -- 2. Tropical Pacific -- 3. Indian Ocean -- 4. Tropical Atlantic -- 5. Conclusion -- Acknowledgments -- References -- Chapter 5. Data Assimilation by Models -- 1. Introduction -- 2. Examples and Merits of Data Assimilation -- 3. Data Assimilation as an Inverse Problem -- 4. Assimilation Methodologies -- 5. Practical Issues of Assimilation -- 6. Summary and Outlook -- Acknowledgments -- References -- Chapter 6. Ocean Tides -- 1. Introduction -- 2. Mathematical Representation of Ocean Tides -- 3. Status Before High-Precision Satellite Altimetry -- 4. Methodologies for Extracting Ocean Tides from Altimetry -- 5. The Semi-Diurnal and Diurnal Tides over the Deep Ocean -- 6. The Long Period Ocean Tides -- 7. Internal Tides -- 8. The Tides over Shallow Waters -- 9. Tidal Energetics and Satellite Altimetry -- 10. Applications -- 11. Conclusions -- Acknowledgments -- References -- Chapter 7. Ocean Surface Waves -- 1. Introduction -- 2. Wave Modeling and Altimetry. , 3. Wave Climate Studies with Altimeter Data -- 4. Conclusions -- 5. Glossary -- Acknowledgments -- References -- Chapter 8. Sea Level Change -- 1. Introduction -- 2. The Tide Gauge Record and its Limitations -- 3. Satellite Altimeter Measurements of Sea-Level Change -- 4. Calibration of Satellite Altimeter Measurements Using Tide Gauge Data -- 5. Detecting Changes in the Rate of Sea-Level Rise -- 6. Global Mean Changes in Sea Level, Sea-Surface Temperature, and Precipitable Water -- 7. Spatial Variations of Sea-Level Change and Sea-Surface Temperature -- 8. Linking Together Different Satellite Altimeter Missions -- 9. Conclusions -- Acknowledgments -- References -- Chapter 9. Ice Sheet Dynamics and Mass Balance -- 1. Introduction -- 2. Radar Altimeter Measurement of Ice Sheet Surface Elevations -- 3. Greenland and Antarctica Ice Sheet Topography -- 4. Ice Surface Slopes and Driving Stresses -- 5. Measurement of Ice Margins -- 6. Surface Elevation Changes and Mass Balance -- Acknowledgments -- References -- Chapter 10. Applications to Geodesy -- 1. Introduction -- 2. Mean Sea Surface Mapping -- 3. Gravity Recovery -- 4. New Frontiers -- 5. Concluding Remarks -- Acknowledgments -- References -- Chapter 11. Applications to Marine Geophysics -- 1. Introduction -- 2. Filtering the Long-Wavelength Geoid Signal -- 3. Geoid Anomalies and Isostatic Compensation -- 4. Mechanical Behavior of Oceanic Plates: Flexure under Seamount Loading -- 5. Thermal Evolution of the Oceanic Lithosphere -- 6. Oceanic Hotspot Swells -- 7. Short and Medium Wavelength Lineations in the Marine Geoid -- 8. Mapping the Seafloor Tectonic Fabric -- 9. Conclusions -- Acknowledgments -- References -- Chapter 12. Bathymetric Estimation -- 1. Introduction -- 2. Gravity Anomaly and Sea Surface Slopes -- 3. Limitations of Radar Alitmetry for Gravity Field Recovery -- 4. Forward Models. , 5. Inverse Approaches -- 6. Data Availability and Case Study: Bathymetric Estimation -- 7. Prospects for the Future -- 8. Appendix: Interaction of the Radar Pulse with the Rough Ocean Surface -- References -- Index -- Color Plate Section.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 21 (1979), S. 127-154 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The past evolution of the rotation of Venus has been studied by a numerical integration method using the hypothesis that only solar tidal torques and core-mantle coupling have been active since formation. It is found quite conceivable that Venus had originally a rotation similar to the other planets and has evolved in 4.5×109 years from a rapid and direct rotation (12-hour spin period and nearly zero obliquity) to the present slow retrograde one. While the solid tidal torque may be quite efficient in despinning the planet, a thermally driven atmospheric tidal torque has the capability to drive the obliquity from ∼0° towards 180° and to stabilize the spin axis in the latter position. The effect of a liquid core is discussed and it is shown that core-mantle friction hastens the latter part of the evolution and makes even stronger the state of equilibrium at 180°. The model assumes a nearly stable balance between solid and atmospheric tides at the current rotation rate interpreting the present 243 day spin period as being very close to the limiting value. A large family of solutions allowing for the evolution, in a few billions years, of a rapid prograde rotation to the present state have been found. Noticeably different histories of evolution are observed when the initial conditions and the values of the physical parameters are slightly modified, but generally the principal trend is maintained. The proposed evolutionary explanation of the current rotation of Venus has led us to place constraints on the solid bodyQ and on the magnitude of the atmospheric tidal torque. While the constraints seem rather severe in the absence of core-mantle friction (aQ≃15 at the annual frequency is required, and a dominant diurnal thermal response in the atmosphere is needed), for a large range of values of the core's viscosity, the liquid core effect allows us to relax somewhat these constraints: a solid bodyQ of the order ∼40 can then be allowed. ThisQ value implies that a semi-diurnal ground pressure oscillation of ≃2 mb is needed in the atmosphere in order for a stable balance to occur between the solid and atmospheric tides at the current rotation rate. No model of atmospheric tides on Venus has been attempted in this study, however the value of 2 mb agrees well with that predicted by the model given in Dobrovolskis (1978).
    Type of Medium: Electronic Resource
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