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  • 1
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Gordon and Research Science Publ.
    Associated volumes
    Call number: M 92.0777 ; M 93.0395
    In: Fluid mechanics of astrophysics and geophysics
    Type of Medium: Monograph available for loan
    Pages: VIII, 881 S.
    ISBN: 0677221207
    Series Statement: Fluid mechanics of astrophysics and geophysics
    Classification:
    Geodynamics
    Language: English
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Associated volumes
    Call number: O 6066
    In: Glacial-isostatic adjustment
    Type of Medium: Monograph available for loan
    Pages: S. 669-706
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Associated volumes
    Call number: O 6065
    In: Glacial-isostatic adjustment
    Type of Medium: Monograph available for loan
    Pages: S. 605-646
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 4
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    PANGAEA
    In:  Supplement to: Yang, Jun; Ding, Feng; Ramirez, Ramses M; Peltier, W R; Hu, Yongyun; Liu, Yonggang (2017): Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse. Nature Geoscience, 10(8), 556-560, https://doi.org/10.1038/ngeo2994
    Publication Date: 2023-01-13
    Description: Ongoing and future space missions aim to identify potentially habitable planets in our Solar System and beyond. Planetary habitability is determined not only by a planet's current stellar insolation and atmospheric properties, but also by the evolutionary history of its climate. It has been suggested that icy planets and moons become habitable after their initial ice shield melts as their host stars brighten. Here we show from global climate model simulations that a habitable state is not achieved in the climatic evolution of those icy planets and moons that possess an inactive carbonate-silicate cycle and low concentrations of greenhouse gases. Examples for such planetary bodies are the icy moons Europa and Enceladus, and certain icy exoplanets orbiting G and F stars. We find that the stellar fluxes that are required to overcome a planet's initial snowball state are so large that they lead to significant water loss and preclude a habitable planet. Specifically, they exceed the moist greenhouse limit, at which water vapour accumulates at high altitudes where it can readily escape, or the runaway greenhouse limit, at which the strength of the greenhouse increases until the oceans boil away. We suggest that some icy planetary bodies may transit directly to a moist or runaway greenhouse without passing through a habitable Earth-like state.
    Keywords: File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 420 data points
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 123 (1985), S. 99-140 
    ISSN: 1420-9136
    Keywords: Quasi-geostropic model ; Statospheric sudden warming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We describe a series of sensitivity experiments with a quasi-geostrophic model of the interaction of stationary planetary waves with the mean zonal flow in the stratosphere and mesosphere. The model is of the Matsuno type, which neglects wave-wave interaction and includes only a single zonal harmonic of the planetary wave spectrum in each simulation. We employed the model to investigate the source of the double-layer structure previously obtained by several authors for the stratospheric sudden warming with wavenumber one. Our results suggest that this characteristic of the model-produced warming is a property only of models without damping. When reasonable dissipation is included in the model, the double-layer structure disappears. This implies the importance of the drag parameterization in properly simulating warming events and, since the actual drag very probably is effected by breaking internal waves, it suggests that future analysis should include a specific representation of this effect. We also investigated the dependence of stratospheric warming on the structure of the zonal wind field. Our analyses show in particular that substantial reduction of the height of the polar night jet mitigates strongly against the occurrence of a sudden warming event.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 124 (1986), S. 1051-1085 
    ISSN: 1420-9136
    Keywords: Quasi-geostrophic model ; stratospheric major warming ; middle-atmospheric drag
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A detailed test of a simple nonlinear quasi-geostrophic model of stratospheric sudden warming has been performed. The model is of Matsuno's type, which includes only the interaction between a single planetary wave and the zonal mean flow. Given this limitation, the 1979 major stratospheric sudden warming has been employed to test the ability of the model to simulate an actual warming event. This event proved to be an especially appropriate testing ground for the model, since its main assumptions were reasonably well satisfied by the observational evidence. Results from the model simulations demonstrate (a) that such simple quasi-geostrophic dynamics are completely capable of providing a rather detailed simulation of the 1979 major warming event and (b) that the ability of the model to simulate successfully the observed evolution of the warming is extremely sensitive to the magnitude and form of the dissipation mechanism that is assumed to operate in the middle atmosphere.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 17 (1985), S. 561-608 
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 35 (2003), S. 135-167 
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The issue of the physical mechanism(s) that control the efficiency with which the density field in stably stratified fluid is mixed by turbulent processes has remained enigmatic. Similarly enigmatic has been an explanation of the numerical value of ~0.2, which is observed to characterize this efficiency experimentally. We review recent work on the turbulence transition in stratified parallel flows that demonstrates that this value is not only numerically predictable but also that it is expected to be a nonmonotonic function of the Richardson number that characterizes preturbulent stratification strength. This value of the mixing efficiency appears to be characteristic of the late-time behavior of the turbulent flow that develops after an initially laminar shear flow has undergone the transition to turbulence through an intermediate instability of Kelvin-Helmholtz type.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 114 (1993), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A formal inverse theory for mantle viscosity is here applied to a relaxation spectrum derived from the post-glacial uplift of Fennoscandia. the spectrum represents the set of eigenfrequencies (or inverse decay times) for the fundamental mode of viscous gravitational relaxation between the spherical harmonic degrees 14 to 45 and 65 to 80. Theoretical predictions of the eigenfrequencies are based upon the determination of the zeroes of the secular determinant function derived for a spherically symmetric, self-gravitating, visco-elastic planet. Differential kernels relating shifts in the eigenfrequencies to arbitrary perturbations in the radial viscosity profile (i.e. Fréchet kernels) are computed using the variational principle derived by Peltier (1976). the inversions are performed within the framework of non-linear Bayesian inference, and the problem has been parameterized in terms of the logarithm of viscosity.The inversions have yielded a set of robust constraints which all models for the radial viscosity profile below Fennoscandia must satisfy. the a posteriori estimates and variance reduction are found to be insensitive to the a priori variance ascribed to the model layers. the constraints have, furthermore, been summarized into a set of a posteriori estimates of the average model viscosity value in radial regions consistent with the resolving power of the data (which decreases from a radial length scale of approximately 120km at the base of the lithosphere to 1200km at 1000km depth; the data provide essentially no information regarding the mantle rheology below 1200km depth). For example, for Earth models with a lithospheric thickness (LT) of 100 km, the volumetric average logarithm of viscosity in regions in the depth ranges 1040-400 km, 670-210 km and 235-100 km is constrained to be, respectively, 21.03±0.09, 20.70±0.08 and 20.37±0.19. We have repeated the inversions for a number of assumed lithospheric thicknesses and have found that a relatively low-viscosity layer in the sublithospheric region (with respect to the underlying upper mantle) is required for LT ≤ 120km. In this respect we have quantified the previously described trade-off between a decrease in the viscosity of this region and a decrease in LT (Cathles 1975).In forward analyses of the glacial isostatic adjustment data set it is common to use Earth models with isoviscous upper and lower mantle regions. to investigate this ‘two-layer’ case we have also performed inversions which assume perfect correlation amongst the model layers in the upper and, separately, the lower mantle. Under this strict model space limitation, the inversions yield models with upper and lower mantle viscosities in the range 3.7 × 1020-4.5 × 1020 Pa s and 2.2 × 1021-1.9 × 1021 Pa s, respectively. (The ranges are obtained from a suite of inversions using lithospheric thickness from 70 km to 145 km.)The a posteriori constraints generated from the Bayesian inversions are used together with a statistic based on the computed misfit to the Fennoscandian relaxation spectrum, to rule out a number of previously published viscosity models.
    Type of Medium: Electronic Resource
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