Faculty and Staff

Shade plays an important role in designing pedestrian-friendly outdoor spaces in hot desert cities. This study investigates the impact of photovoltaic canopy shade and tree shade on thermal comfort through meteorological observations and field surveys at a pedestrian mall on Arizona State University's Tempe campus. During the course of 1 year, on selected clear calm days representative of each season, we conducted hourly meteorological transects from 7:00 a.m. to 6:00 p.m. and surveyed 1284 people about their thermal perception, comfort, and preferences. Shade lowered thermal sensation votes by approximately 1 point on a semantic differential 9-point scale, increasing thermal comfort in all seasons except winter. Shade type (tree or solar canopy) did not significantly impact perceived comfort, suggesting that artificial and natural shades are equally efficient in hot dry climates. Globe temperature explained 51 % of the variance in thermal sensation votes and was the only statistically significant meteorological predictor. Important non-meteorological factors included adaptation, thermal comfort vote, thermal preference, gender, season, and time of day. A regression of subjective thermal sensation on physiological equivalent temperature yielded a neutral temperature of 28.6 °C. The acceptable comfort range was 19.1 °C-38.1 °C with a preferred temperature of 20.8 °C. Respondents exposed to above neutral temperature felt more comfortable if they had been in air-conditioning 5 min prior to the survey, indicating a lagged response to outdoor conditions. Our study highlights the importance of active solar access management in hot urban areas to reduce thermal stress.

Background & Objective:
Over the past several decades, systematic reviews have become a major part of the biomedical research literature landscape. While systematic reviews were originally developed for medicine and its related fields, they are now published in other disciplines. Our initial goal was to broadly investigate and describe the non-health sciences subject areas and disciplines that are publishing systematic reviews. Specifically, our research questions were,“What disciplines outside of the health sciences are adopting systematic reviews as a research method?” and “What implications may this have for health sciences librarianship?” Based on our initial findings, we will propose avenues for future research.

Methods & Discussion:
We conducted a search in the Scopus database to serve as a representative sample of the research literature. We searched for the phrase “systematic review*” in the article title or abstract, and limited the results to review articles from journals. We filtered out articles published in health sciences disciplines using the Scopus subject categories, and examined the articles that remained. The resulting set of titles was screened by two independent reviewers in a stepwise fashion. First we read the titles, then the abstracts, then the full text of remaining articles to determine if each was a systematic review and addressed a topic outside of the health sciences. We reconciled any differences for citations on which there was not initial consensus between reviewers. Lastly, we examined each remaining article to categorize its subject area or discipline. Our initial search included a number of systematic reviews outside the health science disciplines, and will yield data that has implications for librarians in the health sciences and in disciplines outside the health sciences field.

Summer daytime cooling efficiency of various land cover is investigated for the urban core of Phoenix, Arizona, using the Local-Scale Urban Meteorological Parameterization Scheme (LUMPS). We examined the urban energy balance for 2 summer days in 2005 to analyze the daytime cooling-water use tradeoff and the timing of sensible heat reversal at night. The plausibility of the LUMPS model results was tested using remotely sensed surface temperatures from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery and reference evapotranspiration values from a meteorological station. Cooling efficiency was derived from sensible and latent heat flux differences. The time when the sensible heat flux turns negative (sensible heat flux transition) was calculated from LUMPS simulated hourly fluxes. Results indicate that the time when the sensible heat flux changes direction at night is strongly influenced by the heat storage capacity of different land cover types and by the amount of vegetation. Higher heat storage delayed the transition up to 3 h in the study area, while vegetation expedited the sensible heat reversal by 2 h. Cooling efficiency index results suggest that overall, the Phoenix urban core is slightly more efficient at cooling than the desert, but efficiencies do not increase much with wet fractions higher than 20%. Industrial sites with high impervious surface cover and low wet fraction have negative cooling efficiencies. Findings indicate that drier neighborhoods with heterogeneous land uses are the most efficient landscapes in balancing cooling and water use in Phoenix. However, further factors such as energy use and human vulnerability to extreme heat have to be considered in the cooling-water use tradeoff, especially under the uncertainties of future climate change.