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  • 1
    Electronic Resource
    Electronic Resource
    Ice cover variability in the Caspian and Aral seas from active and passive microwave satellite data (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 22 (2003), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: The paper discusses time and space variations of ice extent in the Caspian and Aral seas during the last decade (1992-2002). It uses synergy of data from active (radar altimeter) and passive (radiometer) microwave nadir-looking instruments onboard the TOPEX/Poseidon satellite. The proposed approach is substantiated and validated using both in situ and satellite imagery data for the Caspian Sea. The results indicate significant spatial and temporal variability of ice conditions, with a significant decrease of both the duration of ice season and ice extent during the last four winters (1998-2002). The TOPEX/Poseidon-derived time series of sea ice extent are very valuable in view of the fragmentary and mostly unpublished data on ice conditions on the Caspian and Aral seas since the mid-1980s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.2003.tb00094.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Global change Sea level and volcanoes (2005)
    [s.l.] : Nature Publishing Group
    Nature 438 (2005), S. 35-36 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Global warming is producing a rise in sea level. Observations from tide gauges and satellite altimetry indicate that sea level has been rising by 1.8 millimetres per year since 1950 (ref. 1) and about 3 millimetres per year during the 1990s (ref. 2). The two causes are a thermal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/438035a
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Mantle Compressibility and Ocean Warping On Dynamical Models of the Geoid (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The influence of mantle compressibility and warping of the ocean surface on dynamical models of the geoid has been investigated. Topography and geoid kernels show that compressibility modifies the mantle-flow pattern and hence the geoid, whereas the deflection of the oceanic surface amplifies the geoid signal without affecting the global flow. the combined influence of these two effects is significant and depends on the viscosity profile in the mantle. Comparisons with incompressible dynamical geoids show that including the effects of compressibility and ocean warping improves the fit to the observed geoid. Thus these effects must not be neglected in dynamical computations of the geoid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03954.x
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  • 4
    Electronic Resource
    Electronic Resource
    Possible dynamical evolution of the rotation of Venus since formation (1979)
    Springer
    Earth, moon and planets 21 (1979), S. 127-154 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00897084
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  • 5
    Electronic Resource
    Electronic Resource
    Locally layered convection inferred from dynamic models of the Earth's mantle (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 777-780 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On a thousand-kilometre scale, the dominant effect in the Earth's surface topography is the deepening with age of the sea floor, due to lithospheric cooling. This plate cooling component is superimposed on the surface deformation caused by the convective flow, and should appear ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375777a0
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  • 6
    Electronic Resource
    Electronic Resource
    Evolution of the inclination of Phobos (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 430-431 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A substantial secular acceleration of Phobos has been observed6,7, presumably caused by tidal dissipation in the interior of Mars. However, this mechanism seems unable to account for a drastic orbital evolution over the age of the Solar System, particularly for Deimos3,8. On the other hand, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284430a0
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  • 7
    Electronic Resource
    Electronic Resource
    Two distinct trends for cooling of the oceanic lithosphere (1984)
    [s.l.] : Nature Publishing Group
    Nature 310 (1984), S. 401-403 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Cooling of the lithosph¨re causes the geoid height to decrease uniformly with increasing plate age, symmetrically away from the ridge crest11"13. This geoid slope is, in turn, responsible for the observed geoid offset across fracture zones because of the resulting abrupt change in plate age on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/310401a0
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous elastic thickness of the oceanic lithosphere in the south–central Pacific (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 236-238 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Volcanic chains and isolated seamounts supported by elastic flexure of lithospheric plates produce large positive geoid anomalies up to 10-m amplitude and 100-500-km wavelength. These anomlies result from two opposite effects: (1) a positive geoid anomaly due to the topography and (2) a negative ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328236a0
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  • 9
    Electronic Resource
    Electronic Resource
    Global coupling of Earth surface topography with hotspots, geoid and mantle heterogeneities (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 54-57 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently, seismic tomography has revealed long-wavelength velocity anomalies in the mantle6'10, which have been interpreted in terms of geoid anomalies on the basis of dynamical circulation models7'11. Although it is known on theoretical grounds that the dynamical surface topography is the dominant ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340054a0
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  • 10
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    Altimetry for the future: Building on 25 years of progress (2021)
    In:  EPIC3Advances in Space Research, ISSN: 02731177
    Details
    Publication Date: 2021-04-14
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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