Tracer concentration profiles measured in central London as part of the REPARTEE campaign

There have been relatively few tracer experiments carried out that have looked at vertical plume spread in urban areas. In this paper we present results from two tracer (cyclic perfluorocarbon) experiments carried out in 2006 and 2007 in central London centred on the BT Tower as part of the REPARTEE (Regent’s Park and Tower Environmental Experiment) campaign. The height of the tower gives a unique opportunity to study vertical dispersion profiles and transport times in central London. Vertical gradients are contrasted with the relevant Pasquill stability classes. Estimation of lateral advection and vertical mixing times are made and compared with previous measurements. Data are then compared with a simple operational dispersion model and contrasted with data taken in central London as part of the DAPPLE campaign. This correlates dosage with non-dimensionalised distance from source. Such analyses illustrate the feasibility of the use of these empirical correlations over these prescribed distances in central London.

Phase separation in thin films of end-grafted block copolymers

An atomic force microscopy investigation was carried out on various thick (30–120 nm) polymethyl methacrylate-bpolystyrene and poly(2-(dimethyl amino)ethyl methacrylate)-b-polystyrene films prepared via a grafting-from method. The structure of the films was examined with both topographic and phase imaging. Several different morphologies were observed including a perforated lamellar phase with irregular perforations. In addition, complementary small-angle X-ray scattering and reflectometry results measurements on a non-grafted polymer are presented.

Vernacular poetry and the spiritual Franciscans of the Languedoc: the poems of Raimon de Cornet

This chapter, in a book devoted to examining the importance of heresy in the construction of cultural identities in Europe, examines the evidence from recent historical studies of the Spiritual Franciscans for the further contextualisation, and better understanding, of the autobiographical allusions and ideological remarks of the 14th-c. troubadour Raimon de Cornet

Étant Ballet

Solo Exhibition, MacKenzie Art Gallery, Regina, Canada, The project engages with current issues around art production and food provision, catastrophe and agriculture, through the medium of a performance installation. Drawing on some of the characteristics of post dramatic theatre, the project aims to develop a new visual narratology for a contemporary art performance. A large scale video installation and construction features both as an installation site and performance set, explores the relationship between performance and food provision, looking at how changes to the organic world, the world of vibrant and edible matter might affect the way we make art. Developed and produced in collaboration with Canadian company Curtain Razors and funded by grants from Canada Council for the Arts, Saskatchewan Arts Board, the project was first commissioned by Curtain Razors and the MacKenzie Art Gallery where it was shown as a major solo exhibition as part of a series of other international programming (including artists such Guy Ben-Ner and Ron Mueck). The project was then included in the 4th Moscow Biennial as part of the landmark ‘Independent’ exhibition at the Art Arsenal in 2011. The project is planned to tour to varies other international venues throughout 2012/13. The exhibition has been reviewed by Gregory Beatty in Prairie Dog, Regina, by at the The Leader Post, The CBC French Canadian Television. Canadian writer curator Timothy Long artist and curator Elwood Jimmy have produced critical essays of the work, which will feature in a major new book, edited by Susanne Clausen, which is expected to be published in 2012. (OnCurating Publications).

A mechanism for the effect of tropospheric jet structure on the annular mode-like response to stratospheric forcing

For many climate forcings the dominant response of the extratropical circulation is a latitudinal shift of the tropospheric mid-latitude jets. The magnitude of this response appears to depend on climatological jet latitude in general circulation models (GCMs): lower latitude jets exhibit a larger shift. The reason for this latitude dependence is investigated for a particular forcing, heating of the equatorial stratosphere, which shifts the jet poleward. Spin-up ensembles with a simplified GCM are used to examine the evolution of the response for five different jet structures. These differ in the latitude of the eddy-driven jet, but have similar sub-tropical zonal winds. It is found that lower latitude jets exhibit a larger response due to stronger tropospheric eddy-mean flow feedbacks. A dominant feedback responsible for enhancing the poleward shift is an enhanced equatorward refraction of the eddies, resulting in an increased momentum flux, poleward of the low latitude critical line. The sensitivity of feedback strength to jet structure is associated with differences in the coherence of this behaviour across the spectrum of eddy phase speeds. In the configurations used, the higher latitude jets have a wider range of critical latitude locations. This reduces the coherence of the momentum flux anomalies associated with different phase speeds, with low phase speeds opposing the effect of high phase speeds. This suggests that, for a given sub-tropical zonal wind strength, the latitude of the eddy driven jet affects the feedback through its influence on the width of the region of westerly winds and the range of critical latitudes on the equatorward flank of the jet.