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Motions on planetary spatial scales in the atmosphere are governed by the planetary geostrophic equations. However, little attention has been paid to the interaction between the baroclinic and barotropic flows within the planetary geostrophic scaling. This is the focus of the present study, which utilizes planetary geostrophic equations for a Boussinesq fluid supplemented by a novel evolution equation for the barotropic flow. The latter is affected by meridional momentum flux due to baroclinic flow and drag by the surface wind. The barotropic wind, on the other hand, affects the baroclinic flow through buoyancy advection. Via a relaxation towards a prescribed buoyancy profile the model produces realistic major features of the zonally symmetric wind and temperature fields. We show that there is considerable cancellation between the barotropic and the baroclinic surface zonal mean zonal winds. Linear and nonlinear model responses to steady diabatic zonally asymmetric forcing are investigated, and the arising stationary waves are interpreted in terms of analytical solutions. We also study the problem of baroclinic instability on the sphere within the present model.
This special issue explores how finance deploys time, structures the future, and interacts with actors and institutions that sometimes function according to very different temporal regimes. Finance capitalism’s logic of recurrence, repetitive cycles, and successive ruptures has long been with us, but the essays in this special issue are particularly interested in how recent decades of intensified financialization have restructured temporal experience. They interrogate the production and dissemination of agency in an age of acceleration, risk, and uncertainty, asking how the temporality inscribed in financial transactions emerges from and simultaneously shapes individual and social practice. Topics covered range from the logic of finance and foundational concepts of financial theory to the intersection between objective structures and social practice, the role of literature, and finally questions of social insecurity, political action, and the possibility of resistance within a context of competing temporalities. In this introduction, the editors delineate some fundamental concepts and questions for our financial times.
The outset of Joyce’s A Portrait of the Artist as a Young Man presents a stage of life and language that is commonly evoked and, at the same time, systematically avoided in autobiographies as well as theoretical approaches to language: infancy. This textual strategy refers back to Augustine’s Confessiones, one of the most canonical autobiographies, reading it as a mainstay for an unconventional hypothesis: Rather that understanding infancy as an early stage of, or even before, language, Joyce expounds that the condition called infancy – the openness for receiving language while being unable to master it – accompanies all speech, be it childlike or eloquent. The article analyses Joyce’s text as one instance of a general paradox of autobiographical writing: initial aphasia. Setting out with birth or infancy, autobiographical texts precede articulate discourse. In Joyce, this paradox appears as starting point for a poetical – rather than theoretical – thinking about language, and language acquisition.