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  • 1
    Monograph available for loan
    Monograph available for loan
    Berlin [u.a.] : Springer
    Call number: AWI A6-12-0045
    Description / Table of Contents: Contents: - PART I FUNDAMENTAL LAWS. - 1 Preliminaries. - 2 Conservation laws for moving fluids. - PART II COMMON APPROXIMATIONS. - 3 Approximations derived from mode filtering. - 4 Approximations relating to density changes and geometric conditions. - 5 Geostrophic and quasi-geostrophic motions. - PART III OCEAN WAVES. - 6 Sound waves. - 7 Gravity waves. - 8 Long waves. - 9 Lagrangian theory of ocean waves. - 10 Forced waves. - PART IV OCEANIC TURBULENCE AND EDDIES. - 11 Small-scale turbulence. - 12 Geostrophic turbulence. - PART V ASPECTS OF OCEAN CIRCULATION THEORY. - 13 Forcing of the Ocean. - 14 The wind-driven circulation. - 15 The meridional overturning of the oceans. - 16 The circulation of the Southern Ocean. - PART VI APPENDIX. - A Mathematical basics. - B Models of the ocean circulation.
    Description / Table of Contents: Ocean Dynamics is a concise introduction to the fundamentals of fluid mechanics, non-equilibrium thermodynamics and the common approximations for geophysical fluid dynamics and presents a comprehensive approach to large-scale ocean circulation theory. Each of the five parts of the book - fundamental laws, common approximations, ocean waves, oceanic turbulence and eddies, and selected aspects of ocean circulation theory - starts with elementary considerations, blending then classical topics with more advanced developments of fluid mechanics and theoretical oceanography for the respective field.
    Type of Medium: Monograph available for loan
    Pages: xxiii, 704 S. : Ill., graph. Darst., Kt.
    Edition: 1. Aufl.
    ISBN: 9783642234491
    Branch Library: AWI Library
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  • 2
    Call number: 12/M 94.0346
    In: NATO ASI Series
    Type of Medium: Monograph available for loan
    Pages: XIII, 472 S.
    ISBN: 3540568557
    Series Statement: NATO ASI series : I, Global and environmental change 11
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
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    In:  (Doctoral thesis/PhD), Christian-Albrechts-Universität Kiel, Kiel, Germany, 55 pp
    Publication Date: 2018-03-02
    Type: Thesis , NonPeerReviewed
    Format: text
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  • 4
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    AGU / Wiley
    In:  Journal of Geophysical Research: Oceans, 108 (C3). p. 3092.
    Publication Date: 2019-04-04
    Description: A first step for improving the climatological state of high‐resolution general circulation models by means of data assimilation is presented. A method developed for the assimilation of statistical characteristics into chaotic ocean models is applied to assimilate SSH variability from TOPEX/POSEIDON and ERS1 in association with temperature and salinity from the World Ocean Atlas 1997 in order to estimate the underlying mean circulation. The method requires a parameterization of SSH variability which derives from the approach of Green and Stone. By estimating initial conditions for temperature and salinity, a mean state is achieved which, although not fully consistent with the altimetric and climatological data, is markedly improved on time scales of one year in comparison to the control run. The assimilation of SSH variability data introduces complementary information about the main frontal structures consistent with climatological observations. The state is however not an equilibrium state and returns back to the first guess quasi‐equilibrium state for longer integration periods.
    Type: Article , PeerReviewed
    Format: text
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  • 5
    Publication Date: 2012-01-27
    Type: Report , NonPeerReviewed
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  • 6
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    Taylor & Francis
    In:  Tellus A: Dynamic meteorology and oceanography, 54 . pp. 406-425.
    Publication Date: 2016-06-14
    Description: The study investigates perspectives of the parameter estimation problem with the adjoint method in eddy-resolving models. Sensitivity to initial conditions resulting from the chaotic nature of this type of model limits the direct application of the adjoint method by predictability. Prolonging the period of assimilation is accompanied by the appearance of an increasing number of secondary minima of the cost function that prevents the convergence of this method. In the framework of the Lorenz model it is shown that averaged quantities are suitable for describing invariant properties, and that secondary minima are for this type of data transformed into stochastic deviations. An adjoint method suitable for the assimilation of statistical characteristics of data and applicable on time scales beyond the predictability limit is presented. The approach assumes a greater predictability for averaged quantities. The adjoint to a prognostic model for statistical moments is employed for calculating cost function gradients that ignore the fine structure resulting from secondary minima. Coarse resolution versions of eddy-resolving models are used for this purpose. Identical twin experiments are performed with a quasigeostrophic model to evaluate the performance and limitations of this approach in improving models by estimating parameters. The wind stress curl is estimated from a simulated mean stream function. A very simple parameterization scheme for the assimilation of second-order moments is shown to permit the estimation of gradients that perform efficiently in minimizing cost functions.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    American Meteorological Society
    In:  Journal of Physical Oceanography, 37 . pp. 727-742.
    Publication Date: 2018-04-11
    Description: Output from an eddy-resolving model of the North Atlantic Ocean is used to estimate values for the thickness diffusivity κ appropriate to the Gent and McWilliams parameterization. The effect of different choices of rotational eddy fluxes on the estimated κ is discussed. Using the raw fluxes (no rotational flux removed), large negative values (exceeding −5000 m2 s−1) of κ are diagnosed locally, particularly in the Gulf Stream region and in the equatorial Atlantic. Removing a rotational flux based either on the suggestion of Marshall and Shutts or the more general theory of Medvedev and Greatbatch leads to a reduction of the negative values, but they are still present. The regions where κ 〈 0 correspond to regions where eddies are acting to increase, rather than decrease (as in baroclinic instability) the mean available potential energy. In the subtropical gyre, κ ranges between 500 and 2000 m2 s−1, rapidly decreasing to zero below the thermocline in all cases. Rotational fluxes and κ are also estimated using an optimization technique. In this case, |κ| can be reduced or increased by construction, but the regions where κ 〈 0 are still present and the optimized rotational fluxes also remain similar to a priori values given by the theoretical considerations. A previously neglected component (ν) of the bolus velocity is associated with the horizontal flux of buoyancy along, rather than across, the mean buoyancy contours. The ν component of the bolus velocity is interpreted as a streamfunction for eddy-induced advection, rather than diffusion, of mean isopycnal layer thickness, showing up when the lateral eddy fluxes cannot be described by isotropic diffusion only. All estimates show a similar large-scale pattern for ν, implying westward advection of isopycnal thickness over much of the subtropical gyre. Comparing ν with a mean streamfunction shows that it is about 10% of the mean in midlatitudes and even larger than the mean in the Tropics.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    In:  [Invited talk] In: UNSPECIFIED, 23.06, Reading, UK .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
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    DWD
    In:  Promet - Meteorologische Fortbildung, 29 (1-4). pp. 15-28.
    Publication Date: 2016-10-04
    Type: Article , NonPeerReviewed
    Format: text
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  • 10
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    Institut für Meereskunde Kiel
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 011 . Institut für Meereskunde Kiel, Kiel, Germany, pp. 1-100, 100 pp.
    Publication Date: 2016-10-06
    Type: Report , NonPeerReviewed
    Format: text
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