1,721,009 research outputs found
Coupled interannual Rossby waves in a quasigeostrophic ocean–atmosphere model
No full textRossby wave propagation is investigated in the framework of an idealized middle-latitude quasigeostrophic
coupled ocean–atmosphere model. The Rossby waves are observed to propagate faster than both
the classical linear theory (unperturbed solution) and the phase speed estimates when the effect of the zonal
mean flow is added (perturbed solution). Moreover, using statistical eigentechniques, a clear coupled
Rossby wave mode is identified between a baroclinic oceanic Rossby wave and an equivalent barotropic
atmospheric wave. The spatial phase relationship of the coupled wave is similar to the one predicted by
Goodman and Marshall, suggesting a positive ocean–atmosphere feedback. It is argued that oceanic Rossby
waves can be efficiently coupled to the overlying atmosphere and that the atmospheric coupling is capable
of adding an extra speedup to the wave; in fact, when the ocean is simply forced, the Rossby wave
propagation speed approaches the perturbed solution
What is a Minor Philosophy? A Conversation on Thinking from the Periphery in a Global World
No full textThe effects on oceanic planetary waves of coupling with an atmospheric energy balance model
No full textThis paper shows the existence of a growing planetary-wave-like ocean mode, with a decadal period and growth rate, which appears when a stratified, diffusive ocean is coupled to a simple atmosphere via an energy balance model (EBM). Such modes are not found when simpler surface ocean conditions are applied. The mode is low order in the vertical and, because of its slow growth, is likely to be observed in Earth System Models using an EBM in place of a fuller set of atmospheric dynamics. There is no apparent physical energy source for such a mode, and therefore it should not be expected to arise in such a model. The mode is analysed through a hierarchy of simple models, which differ only through their surface boundary condition
Oceanic planetary waves in the coupled ocean-atmosphere system
Full text linkThe propagation of planetary, or Rossby, waves is studied under the effects of different atmospheric couplings. First, analytical matchings are formulated in which a Rossby wave is coupled to different thermodynamical atmospheres, from a simple heat flux condition to the inclusion of an atmospheric energy balance model. The effects on the vertical structure and phase speed of the first modes are negligible. However, it is shown that for the latter case an unstable mode appears. This growing mode, of decadal period and growth rate, has no physical source of energy and therefore is a result of the oversimplified atmosphere employed. In fact, adding physics to the atmospheric model results in a gradual disappearance of the instability. The possibility of observing similar unphysical modes in climate studies, where oversimplified models are adopted, is raised.Next, a quasi-geostrophic coupled model is used in order to analyse the oceanic Rossby wave characteristics under the influence of a full atmosphere. The idealised eddy-resolving model consists of an ocean basin underneath a channel atmosphere, and different configurations for the oceanic component are used. The Rossby waves are observed to propagate faster than both the classical linear theory (unperturbed solution) and the phase speed estimates when the effect of the zonal mean flow is added (perturbed solution). Moreover, using statistical eigentechniques, a coupled Rossby wave is identified, bearing the characteristics of the coupled mode proposed by Goodman and Marshall (1999). It is argued that the atmospheric coupling is capable of adding an extra speed up to the wave; in fact, when the waves are simply forced, their propagation speed approaches the perturbed solution. The waves are observed to break into faster waves, as suggested by LaCasce and Pedlosky (2004), although their resistance to dissipation and instabilities processes is enhanced
by the atmospheric coupling, which provides extra energy to the initial wave during its propagation. The development of a coupled Rossby wave is found to be possible in a basin of the dimensions of both the Pacific and the Atlantic ocean, and its characteristics and strength vary little when the tridimensional accuracy of the ocean is increased
Introduction - Teaching European Studies: Educational challenges
Full text linkThe increasing importance of the european union as a central player in both domestic and international politics since the late 1980s has given a strong boost to an academic research agenda moving beyond nation-oriented approaches (keeler 2005). This development found promptly its way into university curricula, be it in economics, law, history, political science, cultural studies, ir and other programmes. These traditional disciplines saw the raise of new courses, specialised tracks and even entire master’s programmes focusing on the impact of the eu on their respective discipline. In addition, the multifaceted character of the european integration process also led to the creation of new multi- and interdisciplinary bachelor’s, master’s and even phd programmes specifically focusing on the eu. These programmes were mostly labelled european studies or european union studies. While the term european studies could be considered to be broader in scope and reflecting an interest in the european continent in more general terms, in practice both terms are being used interchangeably. In the framework of this study, we have chosen for the most commonly used term of european studies. If the author however specifically wanted to emphasise that a programme was exclusively focusing on the eu, we have allowed for the term eu studies.keywordseuropean studyblended learningcivic educationeducational challengeeuropean integration processthese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves
Suspension of photovoltaic panels over water canals ("Canalvoltaico"): technical feasibility, economic and environmental benefits of a Canal-Top solar plant installation in Emilia-omagna, Italy
No full textSolar energy has become an increasingly important part of the global energy mix. In Italy, the photovoltaic power installed has grown by 40% since 2015 and this raises the problem of land use and occupation. A viable alternative, already experienced in India, is placing solar panels on the top of water canals (Canal-Top, in Italian “Canalvoltaico”). It is a relatively new and innovative approach to solar energy installation that offers several advantages, including the potential to generate renewable energy without occupying additional land, reduce water evaporation from canals, and improve water quality by reducing algae growth. The article explores various canal-top solar projects over the world, then a viable application in the Italian region “Emilia- Romagna” is discussed, evaluating specialized designs, installation and maintenance costs, water evaporation reduction and the potential for conflicts with other water uses. Investment opportunities and risks are also discussed. © 2023, AIDI - Italian Association of Industrial Operations Professors. All rights reserved
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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