The plenary session of the AAAS conference in Vancouver moderated by Frank Sesno, was held before a packed ballroom of more than 1400 participants and webcast live, was billed as a way for scientists to explore new ways of getting their messages out to the public. If science isn’t enough to convince people that warming is a real "planetary emergency," the panelists asked, what can researchers try next?
The modernization of isolated villages brings about a change in human information flow patterns that not only destroys the social fabric of the community, but also the economy and the landscape, according to Sander van der Leeuw, a Senior Sustainability Scientist at Arizona State University’s Global Institute of Sustainability.
Van der Leeuw, an archaeologist and anthropologist specializing in the long-term impacts of human activity on the landscape, studied the consequences of the construction of roads after World War II in Epirus, a region dotted with rural villages that is shared by Greece and Albania. He looked at how information flow patterns were changed by the building of roads and how the mindset of the people in the villages was transformed as a consequence, leading to major transformations in the economy and the social life of the population.
“The roads brought the villages into the modern word, which is essentially a globalization process,” said van der Leeuw, who presented an anthropologist’s view on how globalization works at the local scale during a session at the annual meeting of the American Association for the Advancement of Science on Feb. 19.
Phoenix, the sixth largest U.S. city, is vulnerable to water shortages even without climate change because of heavy outdoor water use and fragmented governance, according to research conducted at the Decision Center for a Desert City (DCDC) at Arizona State University.
“Scientists, decision-makers and the general public have different perceptions of Phoenix’s water problems,” said Patricia Gober, a geographer and Senior Sustainability Scientist at ASU’s Global Institute of Sustainability.
“Scientists see a demand problem, decision-makers see a supply problem; and residents see someone else’s problem,” said Gober, a founding director of DCDC. Gober presented findings from simulation modeling and the principles of decision-making during a session on water security on Feb. 17 at the annual meeting of the American Association for the Advancement of Science.
Whether it’s building an oil pipeline, drilling for fuel in the ocean or “fracking” to flush natural gas out of the Earth, we’re often asked to believe the process is safe, when companies want to do something that could have big benefits. But that process also could be potentially disastrous for the environment.
Now, an economics professor at ASU’s W. P. Carey School of Business has a way for these companies to show the public that the risks will be managed – by requiring them to post the estimated costs of a spill or major environmental side effect ahead of time through the creation of refundable environmental bonds.
“If the risks are manageable, as proponents suggest, then raising the money for the bonds should not be a challenge,” explains V. Kerry Smith, an environmental economist, who is a member of the National Academy of Sciences. “In each case, the requirement for an environmental bond shifts the responsibility for who assumes the risk of any catastrophic event of large-scale development to those arguing the risks are small. When enough others agree, we should have a robust market for those willing to assume the resulting environmental risks.”
Yes, you heard correctly. Sun devils across the university are voluntarily giving up their meat-laden entrees each and every Monday in favor of meals that feature local, organic plant based meals. Why you might ask? The reasons for people vary greatly, but the most popular reasons we hear around the office include; health, animal welfare and global impact. Strike up a conversation today with a nearby foodie and maybe discover your own personal reason(s) for ditching meat one day out of the week.
A solution to the global financial crisis may be in the hands of economists – notably those like Carlo Jaeger of the Potsdam Institute for Climate Impact Research (PIK) – who are embracing a bold economic model designed around green growth.
Jaeger, who has a joint appointment at the University of Potsdam and chairs the European Climate Forum, is at Arizona State University this winter as the Julie Wrigley Visiting Senior Scholar at the School of Sustainability. He has been interacting with ASU sustainability scientists, faculty members and students to discuss research on how a green growth strategy to address the global financial crisis can bring about transformational changes.
Graduate students from the Decision Center for a Desert City's Community of Graduate Research Scholars will present their research at the AAAS Annual Meeting in Vancouver on February 19. They will be accompanied by DCDC Co-PI Margaret Nelson and DCDC Associate Director, Dave White. The American Association for the Advancement of Science (AAAS), is an international non-profit organization dedicated to advancing science around the world by serving as an educator, leader, spokesperson and professional association.
Lauren will be speaking for a few minutes on ASU's Decision Theater and the ability of tools like it to engage people in thinking about climate change and future uncertainty. She will also speak about the need to merry such tools with strong stakeholder engagement processes in order to bring our research closer to relevant decision making scales.
After Lauren's presentation, she will facilitate a breakout group discussion on the potential for decision theaters to improve climate change communication and knowledge among decision makers and the general public.
Rebecca Neel, DCDC Graduate Research Assistant Status, Family, Sex, and Good Neighbors: Landscaping Conveys Personality
Do people use their lawns to look sexy, high status, and family friendly? Previous research shows that recycling and taking public transportation, among other behaviors, can convey a less positive or desirable image, which may prove a barrier to behavior change. We extended this research to examine the image that landscaping portrays for a sample from Phoenix, Arizona, where water resources are scarce and homeowners’ landscaping options range from the water-intensive (grass lawns) to more water-conserving (desert plants and rocks). We hypothesized that owners’ grass or desert landscape choices are seen to convey very different personalities. Across three samples, participants rated the personality characteristics of a new homeowner on dimensions of agreeableness, being a good neighbor, status, sexual attractiveness, family orientation, creativity, prosociality, environmentalism, Big Five personality ratings, and positivity. Participants were randomly assigned to read that the person in question chose either a desert or a grass lawn for their new home. Inferred motivations for choosing desert or grass were also measured. We found consensus among participants that a desert landscape conveys a lower-status, less sexually attractive, family-unfriendly image–suggesting that even among those who might see people with desert landscaping as fine neighbors, they still perceive those individuals to be lower status and not family-oriented. Perceived motivations largely corroborated perceived attributes: Whereas aesthetic preference was perceived as the primary motivation for choosing either a desert or lawn landscape, secondary motivations differed. Desert landscaping was perceived to be more motivated by environmentalism, money savings, and ease of maintenance, whereas grass landscaping was perceived to reflect a desire to interact with one’s neighbors and to raise a family. Our choice of lawn may thus convey much to our neighbors about both our own quality as a neighbor and community member. To the extent that landscaping paints the image of a relatively unfriendly, low-status, unsexy or child-averse person, inferences may prove a barrier to encouraging native landscape adoption, as making such a choice might not only incur a financial cost in the value of the home, but a concurrent cost in self-image.
Lauren Withycombe Keeler, DCDC Graduate Research Assistant
Selecting and Assessing Distinct Scenarios for Sustainable Water Governance Strategies
Sustainable water governance strategies and policy need to be guided by a comprehensive vision of a sustainable water system and account for uncertainty through robust performance against a spectrum of distinct future scenarios. Climate and water science in general have made significant progress over the last years in understanding the complexity of regional climate-water systems, progress well exemplified by the work of the Decision Center for a Desert City (DCDC) at Arizona State University. This success has been demonstrated through the development of sophisticated system dynamics models elaborated further by including energy and econometric models, such as the WaterSim model from DCDC. However, dynamic models in general, and WaterSim in particular, have been limited in their application and not fully utilized for policy-making and governance. Reasons for this limited applicability include: dynamic water-climate models are not generally used to construct distinct, recognizable futures scenarios (such as the IPCC stress scenarios); water-climate models are still evaluated on their ability to forecast the future which limits their scope and potential to guide planning; results of the model are often not evaluated against a comprehensive set of criteria; and finally, dynamic models are often not used to their full potential in a constructive way, to develop future pathways and strategies. To address these deficits in water-climate models and enhance the usability of the WaterSim model, plausible future scenarios were constructed based on stakeholder and decision maker input and output from WaterSim that includes external social and natural factors of uncertainty (e.g., long-term drought, growth, and climate change). Results include a set of 5 distinct, recognizable future scenarios that identify critical key factors and policies that serve to guide decision-making related to water and conceptualize the systemic consequences of water management and mismanagement beyond groundwater overdraft. The scenarios explicate the possible impacts of climate change as well as resource management and economic development decisions at the municipality and metropolitan scales in Central Arizona. In this way, the scenarios contribute to further scientific and political dialogue regarding water management in the face of climate change and close the gap between scientific knowledge about climate change impacts and the adaptive capacity of decision makers.
Gretchen Hawkins, DCDC Graduate Research Assistant
Distributed Hydrologic Modeling of the Beaver Creek Watershed: A Platform for Land Cover and Climate Change Assessments
Watershed management is challenged by rising concerns over climate change and its potential to interact with land cover alterations to impact regional water supplies and hydrologic processes. The inability to conduct experimental manipulations that address climate and land cover change at watershed scales limits the capacity of water managers to make decisions to protect future supplies. As a result, spatially-explicit, physically-based models possess value for predicting the possible consequences on watershed hydrology. In this study, we apply a distributed watershed model, the Triangulated Irregular Network (TIN)-based Real-time Integrated Basin Simulator (tRIBS), to the Beaver Creek basin in Arizona. This sub-basin of the Verde River is representative of the regional topography, land cover, soils distribution and availability of hydrologic data. As such, it can serve as a demonstration study in the broader region to illustrate the utility of distributed models for change assessment studies. Through a model application to summertime conditions, we compare the hydrologic response to two sources of meteorological input: (1) an available network of ground-based stations and (2) weather radar rainfall estimates. Comparisons focus on the spatiotemporal distribution of precipitation, soil moisture, runoff generation, evapotranspiration and recharge from the root zone at high resolution. We also present a preliminary analysis of the impact of vegetation change arising from historical treatments in the Beaver Creek to inform the hydrologic consequences in the form of soil moisture and evaportranspiration patterns with differing degrees of proposed forest thinning. Our results are discussed in the context of improved hydrologic predictions for decision-making under the uncertainties induced by combined climate and land cover change.
Julia C. Bausch, DCDC Graduate Research Assistant
Half Full?: Buffering Central Arizona Farmers from Signals of Environmental Change
Climate change and population growth have far-reaching implications for stressed water resources in the arid American Southwest. This poster explores the impact of current water regulations on the adaptive behaviors of farmers in Arizona. In 1980, Arizona passed what is considered the most comprehensive and progressive water management policy in the country, the Groundwater Management Act (GMA). The GMA was intended to reduce overdraft of groundwater resources, particularly within the agricultural sector, which uses seventy percent of the state’s water supply. Currently, Arizona is in the midst of drought, yet Arizona farmers have increased the area planted in cotton and alfalfa, both water-intensive crops, in response to high commodity prices. We hypothesized that Arizona farmers do not perceive signals of environmental change due to a mismatch between the institutional environment and emergent threats to future water availability, potentially making agriculture a major vulnerability to Arizona’s water supply in times of water scarcity. Using a mixed methods approach, including institutional analysis, statistical analysis of agricultural census data, and semi-structured interviews, we assess what factors affect farmers’ decision-making about water use in Central Arizona. Interview participants included farmers, water managers, water lawyers, and scholars. The results of our study reveal that farmers are buffered from signals of environmental change in four ways: 1) Technologically: Irrigation buffers farmers from dependence on and awareness of precipitation. 2) Geographically: Arizona farmers are physically distant from their water sources, reducing awareness of environmental change. 3) Economically: water is currently abundant and affordable for farmers. 4) Politically: To protect its Colorado River allocation from usurpation by Nevada and California, Arizona has adopted a policy of consuming all of its annual allocation, making water conservation in central Arizona a secondary concern. Given the reality of buffers, if there is public interest in farmer’s participation in adaptation to water scarcity, we should more closely consider how signals of change are communicated in the agricultural sector.
Geetali Dudhbhate, DCDC Graduate Research Assistant An Empathy-Driven, Decision-Making Game To Guide Water Sustainability Related Policy Outcomes
As the economy and the business environment has become more diverse and competitive, at both the individual and organizational levels our use of natural resources exceeds our need. The greed for natural resources has troubling consequences in terms of worldwide economic health and quality of life. It is very challenging to find out how people will collectively behave given the problem of resource sustainability. This research will integrate technology with empathy so as to make the problem less intrusive and will primarily focus on water resources. Focus will be on the development of a decisional game which is based on a series of scenarios and the associated rules, roles and responsibilities for the participants. This game will simulate decisional orientations, approaches and outcomes for policy makers and other stakeholders who contribute to water and other urban climate adaptation issues. Individual participants will take the role of specific water providers and thereafter the game roles of participants will be swapped. The research will test how water providers cooperate under conditions of climate change. Purpose is to test empathy through changing participation levels and to check if it can lead to positive policy options. This game will leverage WaterSim(developed by the NSF funded DCDC at ASU). WaterSim links knowledge about water supply and demand under current and future climate conditions at the water provider level. WaterSim will be adapted and linked to our computer mediated environment such that the results from our study will provide a richer understanding of decisional implications and policy options for addressing water sustainability issues.
Winners of the 14th Annual Student Poster Competition that took place during the CAP All Scientists Meeting have been announced. This year, first place awards go to two posters: Elizabeth Cook, Sharon Hall, Ryan Sponseller, David Huber, Stevan Earl, and Nancy Grimm, "Atmospheric nitrogen deposition in Phoenix AZ is lower than expected: Findings from a methods comparison," and Michelle Schmoker, Elizabeth Cook, Stephanie Amaru, Jennifer Learned, Scott Collins, and Sharon Hall, "Bottom-up vs. top-down regulation of desert annual plants in an urban arid ecosystem." Both winners will receive $100 to spend on research supplies and materials. Erica Warkus, Dana Nakase, Sharon Hall, Osvaldo Sala, and Jennifer Learned's poster, "Spatial associations between surface rocks and succulents in the Agua Fria National Monument," will receive a runner-up award of a limited edition CAP coffee mug. Elizabeth Cook is a Ph.D. student in the School of Life Sciences. Michelle Schmoker and Erica Warkus were involved in CAP's Research Experience for Undergraduates (REU) program. Both are majoring in the biological sciences.
Brenda Shears was honored at the CAP All Scientists Meeting on January 13, 2012 at ASU's SkySong for her "many and varied contributions to the success of the CAP LTER program." Brenda served for many years as the project manager for CAP LTER and was instrumental in securing the first National Science Foundation grant for CAP in 1997. Many of CAP's accomplishments over the years would not have been possible without Brenda's leadership and dedication. We thank her for all that she has done and continues to do for CAP.
During the 2009/2010 academic year, undergraduates Kimberly Pearson, of the School of Sustainability (SOS), Matthew Petrucci of Civil Engineering, Derek Cardinale of Geography and Urban Planning and Canon Leadership Program facilitator Betty Lombardo of University Sustainability Practices (USP) developed a project to increase the capacity, visibility and sense of community space of the Undergraduate Student Government (USG) Bike Co-op.
In the fall of 2011, Dr. Rob Melnick, Director of Arizona State University’s Global Institute of Sustainability, and Grady Gammage Jr. brought graduate students from a variety of ASU’s schools and city officials from the City of Mesa, AZ, together to address key sustainability issues within an interdisciplinary workshop class in the School of Sustainability (SOS).
The City of Mesa teamed up with Arizona State University’s Decision Center for a Desert City to provide two ASU undergraduate student interns with the opportunity to assist in developing water management strategies for the East Salt River Basin.
Several centuries of species exploration have taught us that a vast number of Earth’s plants and animals are extremely limited in their ecological associations and geographic distributions. When these species lose their specific habitats, it usually means extinction. Yet, because we don’t know what or how many species actually exist or where they live, we are unable to detect or measure these quiet changes in biodiversity.
From Sustainability: The Journal of Record, December 2011, 4(6): 261-263, an article by Senior Sustainability Scientist George Basile about the important role of universities in leading change in sustainability and the critical relationship between entrepreneurship and student success.
For any sustainability graduate or new practitioner, there exists a tale of two narratives. The first reflects the reality of a historically horrendous job market, a new field with relatively unknown academic degrees, and an abundance of competition from seasoned professionals. The other reflects the reality of being at the leading edge of a pioneering wave with the opportunity and promise of discovery and forging one’s own future given a more complete understanding of the reality humanity finds itself in. Both narratives paint a picture of transition and both are true. So, what is one to do?
On January 27, 2012 from 11:30-12:45pm, Dave White, Associate Director of DCDC, will give a talk on Advancing Theory and Methods for Boundary Organizations at the Interface of Science and Policy: Lessons from the ASU Decision Center for a Desert City.
The School of Public Affairs colloquium will be held in UCENT 822A at the Downtown Phoenix campus on 411 North Central Avenue in Phoenix.
Annual ‘State of Observed Species’ report released by International Institute for Species Exploration
More than half of the 19,232 species newly known to science in 2009 – the most recent calendar year of compilation – were insects. According to the 2011 State of Observed Species (SOS) report released Jan. 18 by the International Institute for Species Exploration at ASU, insects comprised 9,738 of the year’s new species, or 50.6 percent.
The second largest group in the 2009 report was vascular plants, totaling 2,184 or 11.3 percent. Of the 19,232 in the total count, seven were birds, 41 were mammals and 1,487 were arachnids – spiders and mites.
And, according to this latest report, there was a 5.6 percent increase in new living species discovered in 2009, compared to 2008.
The annual SOS report card on the status of human knowledge of Earth’s species summarizes what is known about global flora and fauna. The 19,232 species described as “new” or newly discovered during 2009 represent about twice as many species as were known in the lifetime of Carolus Linnaeus, the Swedish botanist who initiated the modern system of plant and animal names and classifications more than 250 years ago, said the report’s author, Quentin Wheeler, an ASU entomologist and founding director of the species institute.
“The cumulative knowledge of species since 1758 when Linnaeus was alive is nearly 2 million, but much remains to be done,” Wheeler said. “A reasonable guess is that 10 million additional plant and animal species await discovery by scientists and amateur species explorers.”
The U.S. Department of Energy (DOE) and the U.S. Environmental Protection Agency (EPA) are
working together to provide technical assistance to assess the feasibility of developing solar energy
projects on closed landfills. The City of Tucson applied to be part of the program and is one of 26 entities selected. The City submitted an application for technical assistance which will evaluate at least five of the City’s closed landfills.
Online certificate custom-designed to meet US Army, Army National Guard, Army Reserve readiness objectives
The design and establishment of an online graduate certificate in sustainability leadership at Arizona State University for soldiers and civilians in the U.S. Army, Army National Guard and Army Reserve was inaugurated Jan. 6 during a signing ceremony.
Participating in the event at the Army National Guard Bureau headquarters in Arlington, Va., were ASU President Michael M. Crow; Brig. Gen. Daniel J. Nelan, assistant to the director, Army National Guard; and Richard G. Kidd IV, deputy assistant secretary of the Army for energy and sustainability.
DCDC researchers will be participating in the fourteenth anniversary of the Central Arizona–Phoenix Long-Term Ecological Research (CAP LTER) Project at Arizona State University. The Fourteenth Annual All Scientists Meeting and Poster Symposium, "Synthesizing Urban Systems Research," will be held on January 13, 2012 in the Convergence Room at Arizona State University’s SkySong facility.
Poster session #1 from 11:30am - 12:30pm
Climate, Ecosystems and People
Land Use, Land Cover and Land Architecture
Water Dynamics in a Desert City
Bausch, J. C., J. P. Connors, C. Rubinos, H. Eakin, R. Aggarwal, and A. York. Agriculture around a desert city: Perspectives on decisions for water, land and livelihood.
Climate change and population growth have far-reaching implications for water resources in the arid American Southwest. Despite the rapid pace of urbanization in Arizona, agriculture accounts for around 70% of total water use in the state. This study is based on interviews conducted with a wide range of stakeholders in agriculture from July -December 2011 to get multiple cross-scale perspectives on the historical and current stresses on agriculture in the Phoenix metropolitan area and the role of irrigation institutions in influencing agricultural water use. The analysis explicitly considered how recent events, such as the recession and boom in commodity prices have influenced farmers' decisions. The results illustrate that while irrigation infrastructure has largely buffered farmers from inter-annual variability in water availability, interviewees noted several other stresses related to development pressures, labor availability, air quality regulations and energy costs. On one hand, the expansion of agricultural acreage and water demand in since 2007 demonstrates the vitality of agriculture in Central Arizona. On the other hand, it alerts us to the limitations of irrigation institutions and infrastructure in conveying the right signals about future water scarcity. Looking forward, uncertainties in water availability, urbanization pressures, and U.S. farm policy challenge the long-term viability of agriculture in Central Arizona. This analysis underscores the complexity of the farm decision environment, suggesting that if farmers are to play specific roles in Central Arizona’s water future, policy makers will need to understand the factors that underlie farmers' decision making and the circumstances that maintain farm viability around the metropolitan area.
Middel, A., A. J. Brazel, S. Kaplan, and S. W. Myint. Summer cooling efficiency of landscapes in Phoenix, AZ.
The summer cooling-water use tradeoff is investigated for different landscapes in Phoenix, Arizona using calculations of atmospheric energy fluxes from a model called the Local-Scale Urban Meteorological Parameterization Scheme (LUMPS, after Grimmond and Oke, 2002) and a cooling efficiency concept after Shashua-Bar et al. (2009). We examined two summer days in 2005 to analyze the cooling efficiency of different land cover mixes in the urban core. LUMPS model results were correlated to surface temperatures from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery and reference evapotranspiration values from a meteorological station for validation. Cooling efficiency was estimated from daytime sensible and latent heat flux differences of the LUMPS raw fluxes for urban surfaces and the desert. Results indicate that cooling at night is strongly influenced by the heat storage capacity of different land cover types and by the amount of vegetation. 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 result in negative cooling efficiencies compared to the desert. Findings indicate that low to moderately dry 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 waves have to be considered in the cooling-water use tradeoff, especially under the uncertainties of future warming of the climate.
Sampson, D. A., and R. Quay. An application programmer's interface (API) to WaterSim; WaterSim 5.0.
Our mission at the Decision Center for a Desert City (DCDC) is to "conduct climate, water, and decision research and to develop innovative tools to bridge the boundary between scientists and decision makers in order to put our work into the hands of those whose concern is for the sustainable future of Greater Phoenix." The WaterSim water policy and management model represents one of the core tools created, updated, and maintained by DCDC. We use WaterSim to examine the potential impact of uncertainties in climate and policies on water supply and demand. The newest version of WaterSim—WaterSim 5.0—represents a radical departure from previous versions. Our newly released, provider-level model (individual water providers are modeled separately but evaluated in the aggregate) includes: 1) a city infrastructure model that simulates the movement of water through a standard city system including the water use chain starting from water supply and treatment to delivery to residential and commercial users and, eventually, effluent production and the possible pathways of reclaimed and recycled water; 2) a hierarchical demand-based water supply module; and 3) an open source API and associated documentation which enables others to freely use the WaterSim model for their own research, education, and outreach. This poster presents the programmatic structure and function of WaterSim 5.0 and highlights the potential applications of the model for the decision making arena.
Yes, you heard correctly. Sun devils across the university are voluntarily giving up their meat-laden entrees each and every Monday in favor of meals that feature local, organic plant based meals. Why you might ask? The reasons for people vary greatly, but the most popular reasons we hear around the office include; health, animal welfare and global impact. Strike up a conversation today with a nearby foodie and maybe discover your own personal reason(s) for ditching meat one day out of the week.
Climate change and population growth have far-reaching implications for water resources in the arid American Southwest. Despite the rapid pace of urbanization in Arizona, agriculture accounts for around 70% of total water use in the state. This study is based on interviews conducted with a wide range of stakeholders in agriculture from July -December 2011 to get multiple cross-scale perspectives on the historical and current stresses on agriculture in the Phoenix metropolitan area and the role of irrigation institutions in influencing agricultural water use. The analysis explicitly considered how recent events, such as the recession and boom in commodity prices have influenced farmers' decisions. The results illustrate that while irrigation infrastructure has largely buffered farmers from inter-annual variability in water availability, interviewees noted several other stresses related to development pressures, labor availability, air quality regulations and energy costs. On one hand, the expansion of agricultural acreage and water demand in since 2007 demonstrates the vitality of agriculture in Central Arizona. On the other hand, it alerts us to the limitations of irrigation institutions and infrastructure in conveying the right signals about future water scarcity. Looking forward, uncertainties in water availability, urbanization pressures, and U.S. farm policy challenge the long-term viability of agriculture in Central Arizona. This analysis underscores the complexity of the farm decision environment, suggesting that if farmers are to play specific roles in Central Arizona’s water future, policy makers will need to understand the factors that underlie farmers' decision making and the circumstances that maintain farm viability around the metropolitan area.
The summer cooling-water use tradeoff is investigated for different landscapes in Phoenix, Arizona using calculations of atmospheric energy fluxes from a model called the Local-Scale Urban Meteorological Parameterization Scheme (LUMPS, after Grimmond and Oke, 2002) and a cooling efficiency concept after Shashua-Bar et al. (2009). We examined two summer days in 2005 to analyze the cooling efficiency of different land cover mixes in the urban core. LUMPS model results were correlated to surface temperatures from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery and reference evapotranspiration values from a meteorological station for validation. Cooling efficiency was estimated from daytime sensible and latent heat flux differences of the LUMPS raw fluxes for urban surfaces and the desert. Results indicate that cooling at night is strongly influenced by the heat storage capacity of different land cover types and by the amount of vegetation. 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 result in negative cooling efficiencies compared to the desert. Findings indicate that low to moderately dry 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 waves have to be considered in the cooling-water use tradeoff, especially under the uncertainties of future warming of the climate.
Our mission at the Decision Center for a Desert City (DCDC) is to "conduct climate, water, and decision research and to develop innovative tools to bridge the boundary between scientists and decision makers in order to put our work into the hands of those whose concern is for the sustainable future of Greater Phoenix." The WaterSim water policy and management model represents one of the core tools created, updated, and maintained by DCDC. We use WaterSim to examine the potential impact of uncertainties in climate and policies on water supply and demand. The newest version of WaterSim—WaterSim 5.0—represents a radical departure from previous versions. Our newly released, provider-level model (individual water providers are modeled separately but evaluated in the aggregate) includes: 1) a city infrastructure model that simulates the movement of water through a standard city system including the water use chain starting from water supply and treatment to delivery to residential and commercial users and, eventually, effluent production and the possible pathways of reclaimed and recycled water; 2) a hierarchical demand-based water supply module; and 3) an open source API and associated documentation which enables others to freely use the WaterSim model for their own research, education, and outreach. This poster presents the programmatic structure and function of WaterSim 5.0 and highlights the potential applications of the model for the decision making arena.