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  • 1
    Monograph available for loan
    Monograph available for loan
    Workshop on the planetary boundary layer : 14-18 August 1978, Boulder, Colorado (1980)
    Boston, Mass. : American Meteorological Society
    Details Availability
    Call number: MOP 45485 / Mitte
    Type of Medium: Monograph available for loan
    Pages: iv, 322 Seiten , Illustrationen, Diagramme
    ISBN: 0933876513
    Language: English
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Workshop on Micrometeorology (1973)
    Boston, Mass. : American Meteorological Society
    Details Availability
    Call number: MOP 43855 / Mitte
    Type of Medium: Monograph available for loan
    Pages: XI, 392 Seiten , Illustrationen , 24 cm
    Series Statement: American Meteorological Society publications
    Language: English
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Lectures on air pollution modeling (1988)
    Boston : American Meteorological Society
    Details Availability
    Call number: PIK M 370-93-0266
    Type of Medium: Monograph available for loan
    Pages: 390 p.
    ISBN: 093387667x
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    Turbulence in the atmosphere (2010)
    Cambridge [u.a.] : Cambridge Univ. Press
    Details Availability
    Call number: AWI A17-10-0010 ; M 13.0054
    Description / Table of Contents: Contents: Part I. A Grammar of Turbulence: 1. Introduction; 2. Getting to know turbulence; 3. Equations for averaged variables; 4. Turbulent fluxes; 5. Conservation equations for covariances; 6. Large-eddy dynamics, the energy cascade, and large-eddy simulation; 7. Kolmogrov scaling, its extensions, and two-dimensional turbulence; Part II. Turbulence in the Atmospheric Boundary Layer: 8. The equations of atmospheric turbulence; 9. The atmospheric boundary layer; 10. The atmospheric surface layer; 11. The convective boundary layer; 12. The stable boundary layer; Part III. Statistical Representation of Turbulence: 13. Probability densities and distributions; 14. Isotropic tensors; 15. Covariances, autocorrelations, and spectra; 16. Statistics in turbulence analysis; Index.
    Description / Table of Contents: Introduces turbulence in the atmosphere and in engineering flows to advanced students, and provides a reference work for atmospheric researchers.
    Type of Medium: Monograph available for loan
    Pages: XII, 393 S.. : Ill., graph. Darst.
    Edition: 1st publ.
    ISBN: 9780521887694
    Classification:
    Meteorology and Climatology
    Location: Upper compact magazine
    Branch Library: AWI Library
    Branch Library: GFZ Library
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  • 5
    Electronic Resource
    Electronic Resource
    On the mean rate of energy transfer in turbulence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 14 (2002), S. 2426-2431 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We derive a physical-space expression for the mean rate of transfer of kinetic energy from wave numbers below k to those above. We show that in stationary, homogeneous turbulence our expression is equivalent to Kraichnan's Π(k). In inhomogeneous turbulence it differs slightly from the form commonly used in connection with large-eddy simulation. We attribute this difference to the use of an incorrect expression for the turbulent transport of kinetic energy in wave numbers below k. We suggest that our two-term, physical-space expression could be useful in modeling energy transfer in nonstationary, inhomogeneous flows. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1481745
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  • 6
    Electronic Resource
    Electronic Resource
    Transport asymmetry in skewed turbulence (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 155-162 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large-eddy simulations have shown that passive, conservative scalars emitted into the convective boundary layer (CBL) of the atmosphere have unusual diffusion properties. A species introduced through an area source at the layer top and having zero flux through the bottom (i.e., one undergoing "top-down'' diffusion) has a well-behaved eddy diffusivity, but one introduced at the bottom, with zero flux at the top ("bottom-up'' diffusion) has a much different diffusivity profile in the same turbulence field. It is suggested that the roots of this transport asymmetry lie in the interaction between skewness of the transporting turbulence and the gradient of the flux of the transported scalar. A kinematic model is used to show that this interaction can indeed induce transport asymmetry in small-time-scale, homogeneous turbulence. The present simulations with a Lagrangian particle model confirm that this asymmetry extends to large-time-scale, inhomogeneous turbulence. A heuristic model of convective turbulence suggests that its asymmetric transport is also described by the kinematic model but with the small-time-scale restriction removed. In all cases the transport asymmetry effects scale with the parameter SσwTL/h, where S, σw, and TL are the skewness, standard deviation, and Lagrangian integral time scale of the transporting turbulence, and h is the layer depth; a scalar flux gradient is required as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857874
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  • 7
    Electronic Resource
    Electronic Resource
    Scalar fluxes in the planetary boundary layer — Theory, modeling, and measurement (1990)
    Springer
    Boundary layer meteorology 50 (1990), S. 49-75 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract I outline the general features of the vertical profile of the vertical flux of a conservative scalar in the planetary boundary layer, giving special emphasis to the convective case and emphasizing the importance of the Webb correction. After the influence of thermal stability on the structure of the turbulent eddies carrying this flux is reviewed, recent developments in parameterizing vertical transport in the convective boundary layer are discussed. I then survey three approaches to the numerical modeling of this transport — second-order closure, large-eddy simulation, and direct numerical simulation. Eddy-correlation, eddy-accumulation, and indirect techniques for measuring scalar fluxes are surveyed and contrasted. Finally, I discuss the physics of probe-induced flow distortion and its impact on scalar flux measurement, showing that it can be quite severe for trace species density fluxes measured from aircraft.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120518
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  • 8
    Electronic Resource
    Electronic Resource
    The Effects of Probe-Induced Flow Distortion on Velocity Covariances: Field Observations (1999)
    Springer
    Boundary layer meteorology 91 (1999), S. 483-493 
    Details
    ISSN: 1573-1472
    Keywords: Turbulence ; Flow distortion ; Sonic anemometers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We carried out measurements to test a simple theory of the effect of probe-induced flow distortion on turbulence measurements. We used two three-component sonic anemometers mounted 1.8m apart at a height of 6.7 m. Behind one was a horizontal circular cylinder of radius 0.15 m and length 1.2 m, chosen to model two-dimensional probe-induced flow distortion in the limit where the scale of the turbulence is very large compared to the scale of the probe. The second sonic anemometer measured the undistorted flow. The measured flow-distortion effects on the Reynolds shearing stress and the variances of streamwise and vertical velocity agree well with the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001868030313
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  • 9
    Electronic Resource
    Electronic Resource
    Parameterizing turbulent diffusion through the joint probability density (1992)
    Springer
    Boundary layer meteorology 60 (1992), S. 1-13 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The “convective mass flux” parameterization often used in meteorological modeling expresses the vertical flux of a transported scalar as proportional to the product of the difference in mean values of the scalar in updrafts and downdrafts and their characteristic velocity. The proportionality factor is a constant to be specified. We show that this proportionality factor also appears in the “relaxed eddy accumulation” technique of Businger and Oncley. That associates the surface-layer flux of a scalar with the product of the standard deviation of vertical velocity and the mean concentration difference between updrafts and downdrafts. We show that this constant (b) is determined uniquely by the joint probability density (jpd) of vertical velocity and the scalar. Using large-eddy simulation, we generate this jpd for a conservative scalar diffusing through a convective boundary layer. It has quite different forms in “top-down” and “bottom-up” diffusion geometries. The bottom-up jpd is fairly well represented by a jointly Gaussian form and implies b ~ 0.6, in good agreement with the surface-layer value reported by Businger and Oncley. The top-down jpd is strikingly non-Gaussian and gives b ~ 0.47. Updrafts carry the bulk of the scalar flux - 70% in the bottom-up case, 60% in the top-down case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00122059
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  • 10
    Electronic Resource
    Electronic Resource
    An evaluation of neutral and convective planetary boundary-layer parameterizations relative to large eddy simulations (1996)
    Springer
    Boundary layer meteorology 79 (1996), S. 131-175 
    Details
    ISSN: 1573-1472
    Keywords: closure ; large-eddy simulation ; comparison ; turbulent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper compares a number of one-dimensional closure models for the planetary boundary layer (PBL) that are currently in use in large-scale atmospheric models. Using the results of a large-eddy simulation (LES) model as the standard of comparison, the PBL models are evaluated over a range of stratifications from free convective to neutral and a range of surface shear stresses. Capping inversion strengths for the convective cases range from weakly to strongly capped. Six prototypical PBL models are evaluated in this study, which focuses on the accuracy of the boundary-layer fluxes of momentum, heat, and two passive scalars. One scalar mimics humidity and the other is a top-down scalar entrained into the boundary layer from above. A set of measures based on the layer-averaged differences of these fluxes from the LES solutions is developed. In addition to the methodological framework and suite of LES solutions, the main result of the evaluation is the recognition that all of the examined PBL parameterizations have difficulty reproducing the entrainment at the top of the PBL, as given by the LES, in most parameter regimes. Some of the PBL models are relatively accurate in their entrainment flux in a subset of parameter regimes. The sensitivity of the PBL models to vertical resolution is explored, and substantive differences are observed in the performance of the PBL models, relative to LES, at low resolution typical of large scale atmospheric models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120078
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