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  • 1
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Linear Rossby wave dispersion relationships suggest that Jupiter’s Great Red Spot (GRS) is a baroclinic structure embedded in a barotropic shearing zonal flow. Quasi-geostrophic (QG) two-layer simulations support the theory, as long as an infinitely deep zonal flow is assumed. However, once a finite depth of the lower layer is assumed, a self-interaction of the baroclinic eddy component produces a barotropic radiating field, so that the GRS-like eddy can no longer remain compact. Compactness is recovered by explicitly introducing a deep dynamics of the interior for the lower layer, instead of the shallow QG formulation. An implication of the result is a strong coupling of the GRS to a convectively active interior.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2013-08-31
    Description: The Joint Global Ocean Flux Study (JGOFS), currently being organized under the auspices of the Scientific Committee for Ocean Research (SCOR), is intended to be a decade long internationally coordinated program. The main goal of JGOFS is to determine and understand on a global scale the processes controlling the time-varying fluxes of carbon and associated biogenic elements in the ocean and to evaluate the related exchanges with the atmosphere, sea floor and continental boundaries. 'A long-term goal of JGOFS will be to establish strategies for observing, on long time scales, changes in ocean biogeochemical cycles in relation to climate change'. Participation from a large number of U.S. and foreign institutions is expected. JGOFS investigators have begun a set of time-series measurements and global surveys of a wide variety of biological, chemical and physical quantities, detailed process-oriented studies, satellite observations of ocean color and wind stress and modeling of the bio-geochemical processes. These experiments will generate data in amounts unprecedented in the biological and chemical communities; rapid and effortless exchange of these data will be important to the success of JGOFS.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Proceedings of the Ocean Climate Data Workshop; p 229-249
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  • 3
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The two-dimensional asymmetric merger of two like-signed uniform vorticity patches with different sizes (r i ) and vorticities (q i ) was examined with contour dynamics experiments. We determined the critical centroid distances for merger (d merger), which vortex survived the interaction and the processes involved in the merger. An explicit empirical critical merger distance was established asd merger/r 1 =a·(q 2/q 1)1/2·(r 2/r 1)+b (subscript 1 denotes the properties of the losing [destroyed] vortex and 2 the winning [not destroyed] vortex). The relationship seems applicable for wide range of parameters. The winning vortex was found to be determined primarily by vorticity rather than size. A small but strong enough vortex is absorbed into a larger and weaker vortex and becomes the high vorticity core of the merged vortex. A small and weak vortex is strained out to a thin filament. The vorticity ratio which determined when the first vortex was destroyed while the second survived, (q 2/q 1)win, was established empirically as a function of radius ratio,r 1/r 2. Forr 1/r 2∼1, (q 2/q 1)win is almost identical with the vorticity ratio (q 2/q 1)dmin which gives the minimum critical merger distance for the particular size ratior 1/r 2. For extremely large size ratio, (q 2/q 1)win〉(q 2/q 1)dmin Partial mergers were seen for a centroid distance which is close to and less than the critical merger distance.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 4 (1994), S. 355-367 
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solitary wave or isolated eddy models are often invoked to explain the longevity of strong nonlinear features in oceans and atmospheres. But when we look at the physics in detail, we find that models of isolated eddies often hinge either on an oversimplification of the dynamics or on constraints which are not appropriate for the observed eddies. In a more complete model, as this study demonstrates, rings (and probably other nonlinear geophysical eddies as well) will interact with their surroundings via Rossby wave radiation, primarily in the barotropic mode. Such wave generation leads to a slow decay of the eddy as energy leaks into the wave field.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2004-12-03
    Description: To show that robust vortices can exist in the solar nebula, a pseudospectral model has been developed to examine the evolution of the vortex in a Keplerian shear. Calculations show that a vortex can exist for 10(exp 4)yr at Jupiter's radius.
    Keywords: Astronomy
    Type: From Stardust to Planetesimals: Contributed Papers; 183-186; NASA-CP-3343
    Format: text
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  • 6
    Publication Date: 2017-01-04
    Description: The 1995 program in Geophysical Fluid Dynamics addressed "Rotating Convection," with particular emphasis on high-Rayleigh-number convection and on convection in the ocean.
    Description: Funding was provided by the National Science Foundation under Grant No. OCE-8901012.
    Keywords: Rotating convection ; Heat transport ; Geophysical fluid dynamics
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 7
    Publication Date: 2017-01-04
    Description: Author Posting. © Cambridge University Press, 2003. This article is posted here by permission of Cambridge University Press for personal use, not for redistribution. The definitive version was published in Journal of Fluid Mechanics 481 (2003): 329-353, doi:10.1017/S0022112003004051.
    Description: In this article we investigate time-periodic shear flows in the context of the two-dimensional vorticity equation, which may be applied to describe certain large-scale atmospheric and oceanic flows. The linear stability analyses of both discrete and continuous profiles demonstrate that parametric instability can arise even in this simple model: the oscillations can stabilize (destabilize) an otherwise unstable (stable) shear flow, as in Mathieu's equation (Stoker 1950). Nonlinear simulations of the continuous oscillatory basic state support the predictions from linear theory and, in addition, illustrate the evolution of the instability process and thereby show the structure of the vortices that emerge. The discovery of parametric instability in this model suggests that this mechanism can occur in geophysical shear flows and provides an additional means through which turbulent mixing can be generated in large-scale flows.
    Description: F.P.’s and G.F.’s research was supported by grants from NSF, OPP- 9910052 and OCE-0137023. J.P.’s research is supported in part by a grant from NSF, OCE-9901654.
    Keywords: Time-periodic shear flows ; Parametric instability
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 349820 bytes
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  • 8
    Publication Date: 2017-01-07
    Description: The topic for the 30th Geophysical Fluid Dynamics Summer Program was "The Influence of Convection on Large- Scale Motions." The principal lecturer, Kerry Emanual, presented the essential elements of dry convection, the thermodynamics of moist air, and moist convection (both precipitating and not). Building upon this excellent summary of the fundamentals of atmospheric convection, he then discussed its role in the dynamics of squall lines, tropical cyclones, and the 40-day tropical wave. Moist convection has not been discussed in recent GFD seminars, and Kerry's lectures provided a superb introduction to the topic for both Fellows and Staff. Other meteorologists discussed recent theoretical and observational research on atmospheric convecting systems. Convectively-driven flows in the ocean were described by Peter Killworth; Ed Spiegel and Christian Elphick reviewed the theory of nonlinear convection. These views of convection in other systems lent valuable perspectives on the atmospheric problem.
    Description: Funding was provided by the Office of Naval Research under contract Number N00014-82-G-0079, and the National Science Foundation through grant Number DMS-85-04166.
    Keywords: Ocean circulation ; Mathematical models
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 9
    Publication Date: 2017-01-04
    Description: Author Posting. © American Meteorological Society, 2011. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 41 (2011): 889–910, doi:10.1175/2010JPO4496.1.
    Description: This paper examines interaction between a barotropic point vortex and a steplike topography with a bay-shaped shelf. The interaction is governed by two mechanisms: propagation of topographic Rossby waves and advection by the forcing vortex. Topographic waves are supported by the potential vorticity (PV) jump across the topography and propagate along the step only in one direction, having higher PV on the right. Near one side boundary of the bay, which is in the wave propagation direction and has a narrow shelf, waves are blocked by the boundary, inducing strong out-of-bay transport in the form of detached crests. The wave–boundary interaction as well as out-of-bay transport is strengthened as the minimum shelf width is decreased. The two control mechanisms are related differently in anticyclone- and cyclone-induced interactions. In anticyclone-induced interactions, the PV front deformations are moved in opposite directions by the point vortex and topographic waves; a topographic cyclone forms out of the balance between the two opposing mechanisms and is advected by the forcing vortex into the deep ocean. In cyclone-induced interactions, the PV front deformations are moved in the same direction by the two mechanisms; a topographic cyclone forms out of the wave–boundary interaction but is confined to the coast. Therefore, anticyclonic vortices are more capable of driving water off the topography. The anticyclone-induced transport is enhanced for smaller vortex–step distance or smaller topography when the vortex advection is relatively strong compared to the wave propagation mechanism.
    Description: Y. Zhang acknowledges the support of theMIT-WHOI Joint Programin Physical Oceanography, NSF OCE-9901654 and OCE-0451086. J. Pedlosky acknowledges the support of NSF OCE- 9901654 and OCE-0451086.
    Keywords: Transport ; Eddies ; Barotropic flow ; Topographic effects ; Vortices ; Currents ; Potential vorticity ; Rossby waves
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 10
    Publication Date: 2017-01-04
    Description: From the Preface: The 2014 Geophysical Fluid Dynamics Summer Study Program started on June 16th, with the topic of Climate Physics and Dynamics. The topic proved very timely and attracted an unprecedented number of applications from brilliant students. Professors Kerry Emanuel (MIT) and Geoff Vallis (Exeter) gave the principal lectures. They began with the simplest energy balance models and then included adjustment of the vertical profiles by convection (dry and moist). Kerry delved more deeply into convection and the processes found in "cloud-permitting" models, including island effects and the spontaneous formation of clusters surrounded by dry regions. Geoff discussed the larger-scale dynamics of the atmosphere and oceans, including the transports by eddies and the thermohaline circulation.
    Description: Funding was provided by the National Science Foundation Grant No. OCE-1332750
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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