1,721,084 research outputs found
Mathematical Problems in Climate Dynamics
No full text"Mathematical Problems in Climate Dynamics" is a set of 6 lectures given so far at Imperial College London in Spring 2014, http://www.imperial.ac.uk/mathematics/research/opportunities/nelder-visiting-fellowships/fellows/professor-michael-ghil/; at the University of Buenos Aires in Fall 2018, http://mathgeo.cima.fcen.uba.ar/course2018.php; and at École Centrale de Marseille (ECM), https://en.wikipedia.org/wiki/%C3%89cole_centrale_de_Marseille, in Spring 2021. The current version is the one presented at ECM.
This is Lecture III of the set:
III. Energy balance models, paleoclimate & “tipping points”The level of these lectures is graduate in the U.S. system, post-graduate and doctoral school in the EU system
Mathematical Problems in Climate Dynamics, VI
No full text"Mathematical Problems in Climate Dynamics" is a set of 6 lectures given so far at Imperial College London in Spring 2014, http://www.imperial.ac.uk/mathematics/research/opportunities/nelder-visiting-fellowships/fellows/professor-michael-ghil/ ; at the University of Buenos Aires (UBA) in Fall 2018, http://mathgeo.cima.fcen.uba.ar/course2018.php ; at the École Centrale de Marseille (ECM), https://en.wikipedia.org/wiki/%C3%89cole_centrale_de_Marseille , in Spring 2021; and at the University of Pisa (UniPi), https://www.unipi.it/ , and the Scuola Normale Superiore (SNS) there, https://www.sns.it/it , in July 2022. The current version is the one presented in Pisa.
This is Lecture VI and last of the set:
VI. The wind-driven ocean circulationThe level of these lectures is graduate in the U.S. system, post-graduate and doctoral school in the EU system
Mathematical Problems in Climate Dynamics, IV
No full text"Mathematical Problems in Climate Dynamics" is a set of 6 lectures given so far at Imperial College London in Spring 2014, http://www.imperial.ac.uk/mathematics/research/opportunities/nelder-visiting-fellowships/fellows/professor-michael-ghil/ ; at the University of Buenos Aires (UBA) in Fall 2018, http://mathgeo.cima.fcen.uba.ar/course2018.php ; at the École Centrale de Marseille (ECM), https://en.wikipedia.org/wiki/%C3%89cole_centrale_de_Marseille , in Spring 2021; and at the University of Pisa (UniPi), https://www.unipi.it/ , and the Scuola Normale Superiore (SNS) there, https://www.sns.it/it , in July 2022. The current version is the one presented in Pisa.
This is Lecture IV of the set:
IV. Nonlinear & stochastic models—Random dynamical systemsThe level of these lectures is graduate in the U.S. system, post-graduate and doctoral school in the EU system
Correction to “Orbital forcing, climatic interactions, and glaciation cycles” by Hervé Le Treut and Michael Ghil
No full textGeophysical flows as dynamical systems: the influence of Hide's experiments
No full textMichael Ghil, Peter L Read and Leonard A Smith recount the many and various ways that Raymond Hide has influenced their life and work in geophysical fluid dynamics, meteorology, climatology and planetary sciences, as well as in developing the study of dynamical systems in general
Zonal flow regime changes in a GCM and in a simple quasigeostrophic model: The role of stratospheric dynamics
Get PDFThe atmospheric general circulation is characterized by both single- and double-jet patterns. The double-jet structure of the zonal mean zonal wind is analyzed in Southern Hemisphere observations for the two calendar months of November and April. The observed features are studied further in an idealized quasi-geostrophic and a simplified general circulation model (GCM). Results suggest that capturing the bimodality of the zonal mean flow requires the parameterization of momentum and heat fluxes associated with baroclinic instability of the three-dimensional fields.
The role of eddy heat fluxes in generating the observed double-jet pattern is ascertained by using an analytical Eady model with stratospheric easterlies, in which a single wave disturbance interacts with the mean flow. In this model, the dual jets are generated by the zonal mean flow
correction. Sensitivity of the results to the tropospheric vertical wind shear (or, equivalently, the meridional temperature gradient in the basic state's troposphere) is also studied in the Eady model and compared to related experiments using the simplified GCM
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
