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This paper reports on differential absorption lidar (DIAL) measurements of tropospheric ozone in the Canadian Arctic during springtime. Measurements at Eureka Weather Station revealed that mountains have a significant effect on the vertical structure of ozone above Ellesmere Island. Ozone depletion events were observed when air that had spent significant time near to the frozen surface of the Arctic Ocean reached Eureka. This air arrived at Eureka by flowing over the surrounding mountains. Surface level ozone depletions were not observed during periods when the flow of air from over the sea ice was blocked by mountains. In the case of blocking there was an enhancement in the amount of ozone near the surface as air from the mid troposphere descended in the lee of the mountains. Three case studies will be shown in the presentation, while one is described in this paper. [ABSTRACT FROM AUTHOR]

The paper examines multi-site videoconferencing in Northern Ontario as a public sphere. The theory of the public highlights the political effect of multi-site videoconferencing and how the technology contributes to the well-being of the community. To analyze the political effects of videoconferencing, the paper describes a case of the community use of multi-site videoconferencing based on video analysis and semi-structured interviews. The case occurred in 2007 and connected a number of First Nation communities across Canada for simultaneous audio-visual exchange. K-Net Services in Ontario hosted the meeting to gauge the feasibility of public meetings through videoconferencing and to document an example of community uses of the technology. K-Net Services works to develop their videoconferencing infrastructure as a public space. Our findings suggest K-Net's activities have developed a media institution best understood as a counter-public sphere for their service region. The case meeting shows a potential new opportunity to further integrate videoconferencing into community development. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]