The near- through mid-infrared offers a unique and, as this thesis aims to show, essential view of extragalactic stellar populations both nearby, at intermediate redshifts and at very high redshift. In chapter 2, I demonstrate that rest-frame near-IR photometry obtained by the Spitzer Space Telescope provides more robust stellar mass estimates for a spectroscopic sample of ~100 galaxies in the redshift desert (0.5<z<2), and is crucial for modeling galaxies with young star-forming populations. From this analysis, a surprising result emerges in the data. Although the rest-frame light short of 2 micron improves stellar mass estimates, the models and observations disagree beyond 2 micron and emission from non-stellar sources becomes significant. At wavelengths from 1-30 micron, stellar and non-stellar emission contribute equally to a galaxy's global spectral energy distribution. This is unlike visible wavelengths where stellar emission dominates or the far-IR where dust emission provides the bulk of a galaxy's luminosity. Using the sample of high-z galaxies, in chapter 3, I quantify the statistical significance of the excess emission at 2-5 micron and find the emission to correlate with the OII luminosity, suggesting a link between the excess emission and star formation. The origin of the excess emission is not clear, although I explore a number of non-stellar candidates in this chapter. Nearby resolved observations provide a clearer picture of the excess by spatially resolving 68 nearby galaxies. By analyzing the pixel-by-pixel near-IR colours within each galaxy at ~1-5 micron, increasingly red near-IR colors are mapped to spatial regions in chapter 4. For regions with red NIR colors and high star formation rates, I find the broad near- through mid-IR spectrum is constant, varying only in amplitude as a function of the intensity of star formation, suggesting the infrared emission of a young, dusty stellar populations can be added to stellar population synthesis models as an additional component tied to the star formation rate. In closing the thesis, the focus is moved to the detection of stellar populations in the earliest star-forming galaxies. By z>6, all visible wavelength emission is redshifted into near-IR wavelengths. In chapter 5, I show how a tunable near-IR filter I have helped develop holds promise for finding bright Lyman alpha emitting galaxies at redshifts of 8<z<11.

The objective of this Ph.D. project is to investigate Arctic middle atmosphere chemistry using solar infrared absorption spectroscopy. These measurements were made at the Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Nunavut, which is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). This research is part of the CANDAC/PEARL Arctic Middle Atmosphere Chemistry theme and aims to improve our understanding of the processes controlling the stratospheric ozone budget using measurements of the concentrations of stratospheric constituents. The instrument, a Bruker IFS 125HR Fourier transform infrared (FTIR) spectrometer, has been specifically designed for high-resolution measurements over a broad spectral range and has been used to measure reactive species, source gases, reservoirs, and dynamical tracers at PEARL since August 2006. The first part of this research focuses on the optimization of ozone retrievals, for which 22 microwindows were studied and compared. The spectral region from 1000 to 1005 cm-1 was found to be the most sensitive in both the stratosphere and troposphere, giving the highest number of independent pieces of information and the smallest total error for retrievals at Eureka. iii Similar studies were performed in coordination with the Network for the Detection of Atmospheric Composition Change for nine other species, with the goal of improving and harmonizing the retrieval parameters among all Infrared Working Group sites. Previous satellite validation exercises have identified the highly variable polar conditions of the spring period to be a challenge. In this work, comparisons between the 125HR and ACE-FTS (Atmospheric Chemistry Experiment-Fourier transform spectrometer) from 2007 to 2010 have been used to develop strict criteria that allow the ground and satellite-based instruments to be confidently compared. After applying these criteria, the differences between the two instruments were generally small and in good agreement with previous ground-based FTIR/ACE-FTS comparisons. No clear bias was seen from year-to-year, and, in all cases, the difference between the measurements was within one standard deviation. The mean biases between the ACE-FTS and 125HR partial columns for 2007-2010 were -5.61 to 1.11%, -0.23 to 4.86%, -15.33 to -2.86%, -4.77 to 1.09%, and -0.34 to 5.23% for O3, HCl, ClONO2, HNO3, and HF, respectively. The 125HR measurements and three atmospheric models (CMAM-DAS, GEM-BACH, and SLIMCAT) were used to derive an NOy partial column data product for Eureka. This data product includes the five primary species NO, NO2, HNO3, N2O5, and ClONO2 and was used to study the seasonal and interannual variability of NOy from 2007 to 2010. The NOy 15-40 km partial column was found to be approximately constant through the sunlit part of the year, with greater variability during the spring. The mean partial column averaged for the spring period was (2.5±0.2)x1016 molec cm-2, while for the summer, it was (2.3±0.1)x1016 molec cm-2. The springtime evolution of NOy and its constituent nitrogen species, was also examined for all four years. The variability of the 5-NOy partial column was seen to be dominated by that of HNO3. iv The evolution of the individual nitrogen species was found to be consistent with the current understanding of the chemical and dynamical processes that occur in the polar stratosphere. Unusually low ozone columns were measured at Eureka from mid-February to late March 2011 and compared to the previous 14 years of measurements by the 125HR and its predecessor, Environment Canada’s Bomem DA8. The normalized O3/HF, HCl/HF, and HNO3/HF ratios, for which the effects of dynamics have been reduced, also showed record minima over this period. The SLIMCAT chemical transport model was used to quantify chemical ozone loss using the passive subtraction method. Chemical ozone depletion inside the vortex above Eureka was estimated to be 35%, which is the largest observed there in the past 15 years.

This research explores the changing nature of social organization associated with the growth and breakup of large nucleated hunter-gatherer winter settlements in the Mid-Fraser region of south-central British Columbia, ca. 2000-300 cal. B.P. It uses hierarchy and heterarchy as overarching conceptual frameworks for theorizing and evaluating structures of social and political organization. Regional radiocarbon data were used to examine issues of demography and to evaluate the role of scalar stress in producing social change in these burgeoning communities. In order to explore aspects of economic practice and wealth distribution over time artifacts, fauna, and features from sixteen different housepits from five different village sites near the present-day town of Lillooet, British Columbia were analyzed. Results suggest that the villages formed around 1800 cal. B.P. and attained peak population ca. 1200 cal. B.P. The onset of the Medieval Climatic Anomaly at that time altered resource conditions, resulting in greater reliance on mammalian rather than riverine resources. Increased pressure on these resources led to the incorporation of greater amounts of small bodied mammals after 1000 cal. B.P. Apparent declining numbers of houses within large villages after 1200 cal. B.P. suggest that village abandonment began at this time, with individual families likely settling in dispersed villages. The large villages were totally abandoned by 900-800 cal. B.P. Lack of evidence for wealth differentiation in these contexts suggest that social hierarchy based on control over access to resources never emerged in the large villages and that more egalitarian conditions prevailed. Heterarchical structures that allow for shifting balance of power between bands and individual families is argued to have characterized the shift between population aggregation and dispersal.

This dissertation aims to study the mid-level clouds using satellite observations. It consists of two major parts: characteristics (including cloud top/base heights, cloud top pressure and temperature, and cloud thickness) and thermodynamic phase of mid-level clouds. Each part devotes to a particular issue of significant importance for satellite-based remote sensing of mid-level clouds. The first part of this dissertation focuses on the impacts of three definitions of the mid-level clouds based on cloud top pressure, cloud top height, and cloud base height on mid-level cloud characteristics. The impacts of multi-layer clouds on satellite-based global statistics of clouds at different levels, particularly for mid- level clouds, are demonstrated. Mid-level clouds are found to occur more frequently than underlying upper-level clouds. Comparisons of cloud amounts between a merged CALIPSO, CloudSat, CERES, and MODIS (CCCM) dataset and International Satellite Cloud Climatology Project (ISCCP) climatology are made between July 2006 and December 2009. Midlevel cloud characteristics are shown to be sensitive to perturbations in midlevel boundary pressures and heights. The second part focuses on the thermodynamic phase of mid-level clouds. A new algorithm to detect cloud phase using Atmospheric Infrared Sounder (AIRS) high spectral measurements is introduced. The AIRS phase algorithm is based on the newly developed High-spectral-resolution cloudy-sky Radiative Transfer Model (HRTM). The AIRS phase algorithm is evaluated using the CALIPSO cloud phase products for single-layer, heterogeneous, and multi-layer scenes. The AIRS phase algorithm has excellent performance (>90%) in detecting ice clouds compared to the CALIPSO ice clouds. It is capable of detecting optically thin ice clouds in tropics and clouds in the mid-temperature range. Thermodynamic phase of mid-level clouds are investigated using the spatially collocated AIRS phase and CALIPSO phase products between December 2007 and November 2008. Overall, the statistics show that ice, liquid water, and mixed-phase of the mid-level clouds are approximately 20%, 40%, and 40%, globally.

Planning practitioners and academics continually search for ways to help revive ailing downtowns and to better understand the factors that influence the success or failures of downtown revitalization. Most of the literature dealing with such revitalization attempts focuses on either larger urban areas or small rural municipalities -- much of it is based on anecdotal evidence drawn from a very limited number of observations (Filion, et al. 2004; Gratz and Mintz, 1998; Leinberger, 2005; Robertson, 1995, 1999). For the most part, downtown revitalization strategies have focused on either physical or functional improvements. For the mid-size city (population between 50,000 to 500,000), the need for new remedies grounded in an understanding of their present day downtown challenges, is becoming increasingly evident. Recent studies have observed that those mid-size cities ranked as having successful or very successful downtowns all shared distinctive attributes such as high levels of pedestrian activity; a strong tourist or visitor appeal; a well-preserved historical district; attractive natural features such as waterfronts; and the presence of a university in the downtown (Bunting et al. 1999; Filion et al., 2004; Lederer and Seasons, 2005). This dissertation focuses one such factor – the presence of a university. It examines the university role(s) in downtown revitalization and collaborative partnerships between community and university. Collaborative planning theory was used to help conceptualize this research by providing further insights into the dynamics, nature, and roles of these “town-gown” partnerships. Community-university partnerships continue to grow and appear to be helping meet the challenges and complexity of downtown planning issues. However, little empirical research is available on the role of universities in downtown revitalization initiatives, especially in mid-size cities. Using a conceptual framework that included a literature review, field trips, a web-based questionnaire survey, and telephone interviews, information was collected about mid-size city downtowns, roles of universities, university and downtown revitalization, and community-university partnerships. Given the review of the available literature and the information provided by surveyed respondents, universities appear to be playing an important role in downtown revitalization primarily through economic development and human capital investment. The ability for partners to engage more freely in a mid-size city is apparent because they are more readily known and available to each other unlike their counterparts in larger urban centres. Strong leadership, relationship building, accessibility, and open lines of communication limit issues of mistrust and alienation amongst partners. Collaborative planning theory (Healey, 1997, 2003) helped illustrate the importance of mutual learning and relationship building to members who have or are involved with a community-university partnership. Although the roles of partners varied, the weight placed on such roles must be considered as of equal value. The planning process in building vision, capacity building, and negotiating outcomes can be led by community and facilitated by university partners – two very different roles yet weighted equally. The research also suggests that the use of collaborative planning for downtowns is appropriate in settings where collective action is necessary to help provide resources toward revitalizing ailing downtowns. Planners, therefore, must handle a number of roles: listening, educating, facilitating, mediating, advocating, communicating, and organizing. For the university, service learning also plays an important role in educating and developing community -- especially in downtown revitalization. It challenges universities to broaden their missions towards becoming “engaged” campuses supporting not only what is important to them within their own domain but outside as well (i.e. their host community). However, the degree of collaborative effort with universities (i.e. faculty, staff, and students) is dependent on an institution’s culture and its level of support for community engagement and outreach. This research provides new insights into the collaborative nature of the community and university partnership. The knowledge gained from this research provides further understanding of the implications for planning by informing planners and policy-makers about how these partnerships can facilitate downtown revitalization.

The objective of this Ph.D. project is to investigate Arctic middle atmosphere chemistry using solar infrared absorption spectroscopy. These measurements were made at the Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Nunavut, which is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). This research is part of the CANDAC/PEARL Arctic Middle Atmosphere Chemistry theme and aims to improve our understanding of the processes controlling the stratospheric ozone budget using measurements of the concentrations of stratospheric constituents. The instrument, a Bruker IFS 125HR Fourier transform infrared (FTIR) spectrometer, has been specifically designed for high-resolution measurements over a broad spectral range and has been used to measure reactive species, source gases, reservoirs, and dynamical tracers at PEARL since August 2006. The first part of this research focuses on the optimization of ozone retrievals, for which 22 microwindows were studied and compared. The spectral region from 1000 to 1005 cm-1 was found to be the most sensitive in both the stratosphere and troposphere, giving the highest number of independent pieces of information and the smallest total error for retrievals at Eureka. iii Similar studies were performed in coordination with the Network for the Detection of Atmospheric Composition Change for nine other species, with the goal of improving and harmonizing the retrieval parameters among all Infrared Working Group sites. Previous satellite validation exercises have identified the highly variable polar conditions of the spring period to be a challenge. In this work, comparisons between the 125HR and ACE-FTS (Atmospheric Chemistry Experiment-Fourier transform spectrometer) from 2007 to 2010 have been used to develop strict criteria that allow the ground and satellite-based instruments to be confidently compared. After applying these criteria, the differences between the two instruments were generally small and in good agreement with previous ground-based FTIR/ACE-FTS comparisons. No clear bias was seen from year-to-year, and, in all cases, the difference between the measurements was within one standard deviation. The mean biases between the ACE-FTS and 125HR partial columns for 2007-2010 were -5.61 to 1.11%, -0.23 to 4.86%, -15.33 to -2.86%, -4.77 to 1.09%, and -0.34 to 5.23% for O3, HCl, ClONO2, HNO3, and HF, respectively. The 125HR measurements and three atmospheric models (CMAM-DAS, GEM-BACH, and SLIMCAT) were used to derive an NOy partial column data product for Eureka. This data product includes the five primary species NO, NO2, HNO3, N2O5, and ClONO2 and was used to study the seasonal and interannual variability of NOy from 2007 to 2010. The NOy 15-40 km partial column was found to be approximately constant through the sunlit part of the year, with greater variability during the spring. The mean partial column averaged for the spring period was (2.5±0.2)x1016 molec cm-2, while for the summer, it was (2.3±0.1)x1016 molec cm-2. The springtime evolution of NOy and its constituent nitrogen species, was also examined for all four years. The variability of the 5-NOy partial column was seen to be dominated by that of HNO3. iv The evolution of the individual nitrogen species was found to be consistent with the current understanding of the chemical and dynamical processes that occur in the polar stratosphere. Unusually low ozone columns were measured at Eureka from mid-February to late March 2011 and compared to the previous 14 years of measurements by the 125HR and its predecessor, Environment Canada’s Bomem DA8. The normalized O3/HF, HCl/HF, and HNO3/HF ratios, for which the effects of dynamics have been reduced, also showed record minima over this period. The SLIMCAT chemical transport model was used to quantify chemical ozone loss using the passive subtraction method. Chemical ozone depletion inside the vortex above Eureka was estimated to be 35%, which is the largest observed there in the past 15 years.

The near- through mid-infrared offers a unique and, as this thesis aims to show, essential view of extragalactic stellar populations both nearby, at intermediate redshifts and at very high redshift. In chapter 2, I demonstrate that rest-frame near-IR photometry obtained by the Spitzer Space Telescope provides more robust stellar mass estimates for a spectroscopic sample of ~100 galaxies in the redshift desert (0.5<z<2), and is crucial for modeling galaxies with young star-forming populations. From this analysis, a surprising result emerges in the data. Although the rest-frame light short of 2 micron improves stellar mass estimates, the models and observations disagree beyond 2 micron and emission from non-stellar sources becomes significant. At wavelengths from 1-30 micron, stellar and non-stellar emission contribute equally to a galaxy's global spectral energy distribution. This is unlike visible wavelengths where stellar emission dominates or the far-IR where dust emission provides the bulk of a galaxy's luminosity. Using the sample of high-z galaxies, in chapter 3, I quantify the statistical significance of the excess emission at 2-5 micron and find the emission to correlate with the OII luminosity, suggesting a link between the excess emission and star formation. The origin of the excess emission is not clear, although I explore a number of non-stellar candidates in this chapter. Nearby resolved observations provide a clearer picture of the excess by spatially resolving 68 nearby galaxies. By analyzing the pixel-by-pixel near-IR colours within each galaxy at ~1-5 micron, increasingly red near-IR colors are mapped to spatial regions in chapter 4. For regions with red NIR colors and high star formation rates, I find the broad near- through mid-IR spectrum is constant, varying only in amplitude as a function of the intensity of star formation, suggesting the infrared emission of a young, dusty stellar populations can be added to stellar population synthesis models as an additional component tied to the star formation rate. In closing the thesis, the focus is moved to the detection of stellar populations in the earliest star-forming galaxies. By z>6, all visible wavelength emission is redshifted into near-IR wavelengths. In chapter 5, I show how a tunable near-IR filter I have helped develop holds promise for finding bright Lyman alpha emitting galaxies at redshifts of 8<z<11.

Approximately one out of every seven Canadians over the age of 15 years (3.4 million people) has some level of disability. The increasing prevalence of disability in our aging society is commonly accepted as fact with both disability and the severity of disability gradually increasing with age (Statistics Canada, 2001). Recognizing that persons with disabilities often face "barriers" to full participation in society, some provinces have enacted human rights or accessibility planning legislation to remove these barriers. This study examines the process of accessibility planning for persons with disabilities within Canadian municipalities with a population of between 50,000 –500,000, otherwise referred to as mid-size cities (MSC). The underlying assumption of this research is that mid-size Canadian municipalities are carrying out some form of accessibility planning using planning instruments [or other tools] to remove barriers and improve accessibility for persons with disabilities. The purpose of this study is to determine: first, what planning instruments are being used in the design of open space and built environments in MSCs to remove physical barriers, and what other tools are available to attain greater accessibility for persons with disabilities living in mid-size urban settings. Secondly, to consider who is involved in the implementation and use of planning instruments and other tools, and to determine what are their respective roles. Third, to discover the conditions under which planning instruments and other tools are being applied, to learn what financial or other resources are being allocated and how are they being allocated in the short and long term. This study concludes that planning instruments are being used to improve accessibility for persons with disabilities in mid-size Canadian municipalities. Planning tools are not the only way to remove barriers to persons with disabilities. Furthermore, the effectiveness of those tools is clearly contingent upon available human and financial resources. Nevertheless, the study finds that municipal planners and others are using these essential planning tools in a variety of ways to remove physical barriers to accessibility. Inherent in all efforts to remove barriers is the active involvement of persons with disabilities. Thus, involving persons with disabilities in the development and application of planning instruments and other tools has the potential to build the foundation of successful accessibility planning efforts in Canadian mid-size communities. These conclusions have implications for research in the area of accessibility planning and recommendations for Canadian planning practice.

Planning practitioners and academics continually search for ways to help revive ailing downtowns and to better understand the factors that influence the success or failures of downtown revitalization. Most of the literature dealing with such revitalization attempts focuses on either larger urban areas or small rural municipalities -- much of it is based on anecdotal evidence drawn from a very limited number of observations (Filion, et al. 2004; Gratz and Mintz, 1998; Leinberger, 2005; Robertson, 1995, 1999). For the most part, downtown revitalization strategies have focused on either physical or functional improvements. For the mid-size city (population between 50,000 to 500,000), the need for new remedies grounded in an understanding of their present day downtown challenges, is becoming increasingly evident. Recent studies have observed that those mid-size cities ranked as having successful or very successful downtowns all shared distinctive attributes such as high levels of pedestrian activity; a strong tourist or visitor appeal; a well-preserved historical district; attractive natural features such as waterfronts; and the presence of a university in the downtown (Bunting et al. 1999; Filion et al., 2004; Lederer and Seasons, 2005). This dissertation focuses one such factor – the presence of a university. It examines the university role(s) in downtown revitalization and collaborative partnerships between community and university. Collaborative planning theory was used to help conceptualize this research by providing further insights into the dynamics, nature, and roles of these “town-gown” partnerships. Community-university partnerships continue to grow and appear to be helping meet the challenges and complexity of downtown planning issues. However, little empirical research is available on the role of universities in downtown revitalization initiatives, especially in mid-size cities. Using a conceptual framework that included a literature review, field trips, a web-based questionnaire survey, and telephone interviews, information was collected about mid-size city downtowns, roles of universities, university and downtown revitalization, and community-university partnerships. Given the review of the available literature and the information provided by surveyed respondents, universities appear to be playing an important role in downtown revitalization primarily through economic development and human capital investment. The ability for partners to engage more freely in a mid-size city is apparent because they are more readily known and available to each other unlike their counterparts in larger urban centres. Strong leadership, relationship building, accessibility, and open lines of communication limit issues of mistrust and alienation amongst partners. Collaborative planning theory (Healey, 1997, 2003) helped illustrate the importance of mutual learning and relationship building to members who have or are involved with a community-university partnership. Although the roles of partners varied, the weight placed on such roles must be considered as of equal value. The planning process in building vision, capacity building, and negotiating outcomes can be led by community and facilitated by university partners – two very different roles yet weighted equally. The research also suggests that the use of collaborative planning for downtowns is appropriate in settings where collective action is necessary to help provide resources toward revitalizing ailing downtowns. Planners, therefore, must handle a number of roles: listening, educating, facilitating, mediating, advocating, communicating, and organizing. For the university, service learning also plays an important role in educating and developing community -- especially in downtown revitalization. It challenges universities to broaden their missions towards becoming “engaged” campuses supporting not only what is important to them within their own domain but outside as well (i.e. their host community). However, the degree of collaborative effort with universities (i.e. faculty, staff, and students) is dependent on an institution’s culture and its level of support for community engagement and outreach. This research provides new insights into the collaborative nature of the community and university partnership. The knowledge gained from this research provides further understanding of the implications for planning by informing planners and policy-makers about how these partnerships can facilitate downtown revitalization.

The purpose of this research is to understand if and how downtown university campuses contribute to mid-size city downtown revitalization, how this contribution is measured, and the implications for planning practice and planning theory. To address this research question, a mixed methods approach was used which included a literature review, the use of two case studies, a survey administered to downtown businesses, a web-based survey administered to students, faculty and staff and interviews conducted with municipal planners. The two case studies were: Wilfrid Laurier University’s Faculty of Social Work (WLU FSW) in downtown Kitchener, Ontario and the University of Waterloo’s School of Architecture (UW SA) in downtown Cambridge, Ontario. The findings of this research indicate that downtown university campuses do contribute to downtown revitalization in mid-size cities. The WLU FSW and UW SA campuses are not, however, a panacea for their respective downtowns, nor are they significant contributors to downtown retailing or a major catalyst. Rather, the WLU FSW and UW SA campuses act as stabilizing influences on the downtown, bringing confidence to and about the downtown for residents, potential downtown visitors and potential downtown investors. They are examples of revitalization strategies that contribute to the improved reputation of the downtown and city. They are strategies that build on existing downtown strengths (e.g. adaptive re-use of heritage buildings, the complementing of existing businesses and services) and they are part of a larger community vision for these downtowns. The WLU Faculty of Social Work campus and the UW School of Architecture campus are both examples of effective and successful university-community partnerships. Recommendations based on the findings of this research are provided for municipalities, planning practitioners and academics. This research contributes to the limited but expanding literature on mid-size cities, mid-size city downtown revitalization and university-community partnerships. Recommendations for further research are also provided.