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  • 1
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    Inverse problems in atmospheric constituent transport (2002)
    Cambridge ; New York : Cambridge University Press
    Details
    Keywords: Atmospheric diffusion, Mathematical models. ; Dynamic meteorology, Mathematical models. ; Inverse problems (Differential equations)
    Notes: Principles -- Atmospheric transport and transport models -- Estimation -- Time series estimation -- Observations of atmospheric composition -- The sources and sinks -- Problem formulation -- Ill-conditioning -- Analysis of model error -- Green's functions and synthesis inversion -- Time-stepping inversions -- Non-linear inversion techniques -- Experimental design -- Recent Applications -- Global carbon dioxide -- Global methane -- Halocarbons and other global-scale studies -- Regional inversions -- Constraining atmospheric transport
    Pages: xv, 392 p.
    ISBN: 0-511-06457-8
    URL: http://www.netLibrary.com/urlapi.asp?action=summary&v=1&bookid=120229
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    E-Book (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Global distribution and southern hemispheric trends of atmospheric CCl 3 F (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 692-695 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Cumulative CC13F emissions including 1979 are 2.1% higher than used in a previous study5, based on a revised estimate of global releases up to 1980 6, incorporating previously unaccounted for CC13F losses at production sites (1.5% increase in total emissions over the period 1935-79), enhanced ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302692a0
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  • 3
    Electronic Resource
    Electronic Resource
    A lattice statistics model for the age distribution of air bubbles in polar ice (1985)
    [s.l.] : Nature Publishing Group
    Nature 315 (1985), S. 654-655 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to represent the relation between atmospheric concentrations and bubble concentrations, a negative time variable z (in years) is introduced. The variable z increases with depth and has its origin at the present (that is, the time at which the ice core was extracted). The atmospheric ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/315654a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in oceanic and terrestrial carbon uptake since 1982 (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 326-330 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We employ a simplified version of the global carbon and 13C budgets developed by Tans et al.4, to explore changes in d(δ13C)/ d/, where t is time. The budget relies on the fact7 that the product of total carbon and its isotopic ratio (Cxδ13C) is a conservative quantity in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373326a0
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  • 5
    Electronic Resource
    Electronic Resource
    Greenhouse budgets (1991)
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 468-468 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sirâáá¤Hammond et al. suggest1 that for political purposes the relative importance of greenhouse gas emissions from various countries should be based on the observed rate of increase of atmospheric concentraÂá-tion rather than on calculated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/349468a0
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  • 6
    Electronic Resource
    Electronic Resource
    The effective age of bubbles in polar ice (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 777-790 
    Details
    ISSN: 1420-9136
    Keywords: Firn closure ; atmospheric composition ; bubble trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A mathematical description of the trapping of air bubbles in polar ice is analysed in order to assist in the interpretation of measurements of anthropogenic constituents which have recently increased on time scales comparable to the firn closure time. The effective age of a layer of ice is defined in terms of the time at which the atmospheric concentration of a constitutent was equal to the mean concentration for bubbles found in that layer. Under the assumption of uniform snow deposition at a particular site, the effective age is found to be the same for all constituents that vary linearly throughout the trapping period for a layer. Using a trapping distribution based on theoretical and observational studies, the corrections for non-linearity are found to be small for typical anthropogenic constituents. This property makes it possible to use smoothly increasing tracers such as the chlorofluorcarbons to determine the effective age empirically, even though, it is an extremely poorly-conditioned problem to determine the entire trapping time distribution function by inversion of tracer concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878407
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  • 7
    Electronic Resource
    Electronic Resource
    Green's functions and response functions in geochemical modelling (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 328-343 
    Details
    ISSN: 1420-9136
    Keywords: Greens function ; Geochemical modelling ; Atmospheric chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The use of Green's functions and response functions in modelling atmospheric and oceanic tracers is discussed. It is shown that low-resolution Green's function representations can describe tracer distributions more accurately than low-resolution models. The Green's function formalism is also used to discuss the problem of determining surface CO2 sources from observations of surface CO2 concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877027
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  • 8
    Electronic Resource
    Electronic Resource
    Interannual variation of atmospheric CO2 concentration (1986)
    Springer
    Journal of atmospheric chemistry 4 (1986), S. 125-155 
    Details
    ISSN: 1573-0662
    Keywords: Carbon dioxide ; interannual variations ; Southern Oscillation ; El Nino
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A method is described for the analysis of the interannual variability of background atmospheric carbon dioxide concentration. The analysis is carried out on the data from 6 observatories for which records of 〉8 years were available. A global-scale interannual variation of CO2 concentration in the troposphere with a characteristic time-scale of 2–3 years has been confirmed throughout the period of the records. These variations are estimated to be associated with carbon cycle imbalances of 2–3 Gt or annual net exchanges between the atmosphere and another carbon reservoir(s) at a rate of about 1.2 Gt of carbon per year. Lag correlations and amplitude comparisons between the records suggests a low latitude southern hemisphere origin to this phenomenon. The interannual variations of CO2 increase are found to be correlated with those observed in data for Pacific sea surface temperatures and Pacific witd stress, the Southern Oscillation Index and the Quasi-Biennial Oscillation. However multiple regression studies found that once the Southern Oscillation index is used as an explanatory variable for CO2 variations, the inclusion of additional geophysical variables does not give any significant improvement in the regression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053775
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  • 9
    Electronic Resource
    Electronic Resource
    Triangular lattice Potts models (1982)
    Springer
    Journal of statistical physics 28 (1982), S. 351-373 
    Details
    ISSN: 1572-9613
    Keywords: Potts model ; triangular lattice ; Peierls argument ; low temperature series ; phase diagram ; relations with other lattice models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we study the 3-state Potts model on the triangular lattice which has two- and three-site interactions. Using a Peierls argument we obtain a rigorous bound on the transition temperature, thereby disproving a conjecture on the location of its critical point. Low-temperature series are generated and analyzed for three particular choices of the coupling constants; a phase diagram is then drawn on the basis of these considerations. Our analysis indicates that the antiferromagnetic transition and the transition along the coexistence line are of first order, implying the existence of a multicritical point in the ferromagnetic region. Relation of the triangularq-state Potts model with other lattice-statistical problems is also discussed. In particular, an Ashkin-Teller model and the hard-hexagon lattice gas solved by Baxter emerge as special cases in appropriate limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012610
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  • 10
    Electronic Resource
    Electronic Resource
    Series expansions from corner transfer matrices: The square lattice Ising model (1979)
    Springer
    Journal of statistical physics 21 (1979), S. 103-123 
    Details
    ISSN: 1572-9613
    Keywords: Lattice models ; series expansions ; corner transfer matrices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The corner transfer matrix formalism is used to obtain low-temperature series expansions for the square lattice Ising model in a field. This algebraic technique appears to be far more efficient than conventional methods based on combinatorial enumeration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008694
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