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Guglielmo Lacorata, Andrea Mazzino, and Umberto Rizza

spatiotemporal scales comparable to the characteristic spatiotemporal scales of an LES domain. Asymptotic eddy diffusion is indeed unaffected by the small-scale details of the dynamics. Turbulent-like motions of particles can be generated by either stochastic models of dispersion ( Thomson 1987 ) or kinematic models like, for example, a series of unsteady random Fourier modes ( Fung et al. 1992 ; Fung and Vassilicos 1998 ). Our aim here is to exploit the possibility of a fully deterministic nonlinear

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Fay Luxford and Tim Woollings

of the jet will have an enhanced positive tail, which is often interpreted as a signature of blocking anticyclones ( Nakamura and Wallace 1991 ). Similarly, the distribution at an equatorward grid point will have an enhanced negative tail, which is often attributed to cutoff low pressure systems. In this paper, however, we suggest that this pattern of skewness can arise as a simple kinematic consequence of the presence of jet streams. That skewness should be expected to naturally accompany jet

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P. H. Haynes, D. A. Poet, and E. F. Shuckburgh

separate and hence lead to complex patterns of particles or of an advected tracer. Many aspects of chaotic advection have been explored in so-called kinematic models in which the velocity field is imposed as a given function of space and time and the resulting transport and mixing properties of the flow are calculated (e.g., by following fluid particles). The flows considered are often taken to be time periodic, in which case the advection problem reduces to the repeated application of a map. An

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Cameron R. Homeyer, Thea N. Sandmæl, Corey K. Potvin, and Amanda M. Murphy

often the most utilized tool for identifying and evaluating differences between tornadic and nontornadic storms given their ability to sample detailed storm physics and kinematics in both the horizontal and vertical dimensions. However, lightning observations and geostationary satellite imagery have been increasingly used to discriminate between severe and nonsevere storms and, to a lesser extent, tornadic and nontornadic storms using patterns such as the lightning jump (rapid increases in total

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Johanna H. Rosman and Gregory P. Gerbi

interactions that occur between turbulence and surface waves. Surface waves affect turbulence in a kinematical sense as well as a dynamical sense. Turbulent eddies are advected in an unsteady way by wave orbital motion; therefore, assigning a physical interpretation to velocity and scalar fluctuation at a fixed location is complex ( Lumley and Terray 1983 ). Additionally, a conceptual problem arises when an Eulerian framework (fixed reference frame) is used for analyzing turbulence in the presence of waves

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W. Viezee, S. M. Serebreny, R. L. Mancuso, and W. E. Shenk

JUNE1972 VIEZEE, SEREBRENY, MANCUSO AND SHENK 731A Sample Computation of Kinematic Properties from Cloud Motion Vectors~ W. VXEZEE, S. M. SEREBRENY AND R. L. M^~C~JSO Stanford Research Institute, ~lienlo Park, Calif. ^~) W. E. S~IE~X Goddard Space Flight Center, Greenbdt, Md.(Manuscript received 30 NYvember 1971, in revised form 17 February 1972)ABSTRACT Distributions of relative vorticity and

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James T. Moore and Glenn E. Vanknowe

NOVEMBER 1992 MOORE AND VANKNOWE 2429The Effect of Jet-Streak Curvature on Kinematic Fields JAMES T. MOORESaint Louis University, Department of Earth and Atmospheric Sciences, St. Louis, MissouriGLENN E. VANKNOWE$taff Meteorology Office, Rome Laboratory, Griffiss Air Force Base, New York(Manuscript received I March 1991, in final form 4 February 1992) ABSTRACT A

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Ray Q. Lin and Norden E. Huang

848 JOURNAL OF PHYSICAL OCEANOGRAPHY Vo~.tnvm26The Goddard Coastal Wave Model. Part II: Kinematics RAY Q. LrN AND NORD-N E. HUA~OLaboratory for Ocean.?, NASA/Goddard Space Flight Center, Greenbelt, Maryland(Manuscript received 12 January 1994, in final form 9 May 1995)ABSTRACT A new coastal wave model is being developed to study air-sea interaction

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A. D. Kirwan Jr., G. McNally, and J. Coehlo

750 JOURNAL OF PHYSICAL OCEANOGRAPHYGulf Stresm Kinematics Inferred from a Satellite-Tracked Drifter A. D. Kmw~, Ja.Department of Oczanog~apl~y, Texas A ~ M Uni~y~ Co~g~ ~t~i~ 77843G. McN~g ~ J. Co~aws~pps I~n of O~a~grap~y, L~ ~o~, C~if. 920~(M~pt r~dv~ 27 Feb~ 1976, h re~s~ fo~ 16 Apffi 1976) A drifter was deployed in the Gulf Stream and tracked for 5 months by the Nimbus 6 satellite. From thisexperiment we have assessed the technical capability o- the

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Timothy J. Lang and Steven A. Rutledge

produce significant numbers of positive CGs and low-CG storms do not. One approach to addressing this question is to illuminate possible kinematic, microphysical, and environmental differences between low-CG and PPCG storms, as well as differences between these storms and more general convection. This study will focus on identifying these differences through radar and lightning observations of a variety of storms. By examining how lightning output changes as a function of radar-observed storm

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