The University of Arizona

Global Change | The Global Change Graduate Interdisciplinary Program

Scott Saleska

Scott Saleska’s research focuses on how climate interacts with plant physiology, demography, and ecological processes to influence or control biogeochemical cycling from local to global scales. Dr. Saleska uses multidisciplinary approaches that combine classical techniques of field ecology and forestry with advanced technological methods and modeling to integrate biogeochemical processes to ecosystem scales. Dr. Saleska also is interested in the effect of human activities on these processes and on the sustainable functioning of the biosphere in general.

Jeffrey C. Silvertooth

As Associate Dean and Director, Extension & Economic Development, Jeffrey Silvertooth provides overall administrative leadership to University of Arizona Cooperative Extension. Specifically, he provides overall program leadership and administrative and personnel management for Arizona Cooperative Extension. The Director is also responsible for the development of an effective Extension education program and all related translational and applied research programs that are dedicated to extending knowledge resources to the people of the state.

Joellen L. Russell

Joellen Russell uses the GFDL global climate model and observational records to study the impact of climate change on interannual variability in the carbon cycle on a variety of timescales. Her research focuses on quantifying the impact of changes in the physical climate system on the fluxes between reservoirs of carbon. One example is her recent work on the shift in the Westerly Winds, which have moved poleward and increased over the last 30 years in both hemispheres, possibly as the first and most ferocious of the impacts of global warming. In the ocean, Dr.

Armin Sorooshian

Armin Sorooshian received his BS from the University of Arizona (Chemical and Environmental Engineering, 2003) and PhD from the California Institute of Technology (Chemical Engineering, 2008). His research focus is on the effect of aerosol particles on environmental and climate change, public health, and renewable energy applications. Of specific focus are the interactions between aerosols, clouds, and precipitation.

Shirley A. Papuga

Shirley Papuga is an interdisciplinary surface water hydrologist. She specializes in fluid dynamics as it relates to eco-hydrological and land-atmosphere interactions. Eddy covariance and Bowen-ratio techniques are key components of her field research. Her primary interest is focused on understanding how vegetation controls energy, water, and carbon cycling in water-limited ecosystems.

Thomas Swetnam

Thomas Swetnam's primary interests are the applications and teaching of dendrochronology in environmental sciences. He is also keenly interested in the applications of forest and disturbance ecology to land management. He conducts research in forest disturbance history and forest ecology, using tree rings to reconstruct histories of forest fires, insect outbreaks, forest age structures, and climatic variations.  He is the Director of the Laboratory of Tree-Ring Research.

Jonathan T. Overpeck

Jonathan Overpeck is co-director of the Instittue of the Environment (with Diana Liverman) and has active research programs in North America, South America, Africa monsoon Asia, and Australia - most commonly focused on providing paleoenvironmental and climate modeling insights on how key aspects of the Earth’s climate system may change in the future. Although much of Peck's work focuses on terrestrial system, he has also participated research cruises to the Arabian Sea, and tropical Atlantic.

Mary Kay O'Rourke

Mary Kay O'Rourke's research involves environmental exposure assessment, including human exposure to metals, pesticides, volatile organic compounds (VOCs), polycyclicaromatic hydrocarbons (PAHs), bioaerosols, pollen, and mold. Her research interests also include air quality, allergens, asthma, and exposure of children to pesticides. Her expertise is in environmental health, epidemiology, immune diseases, and maternal and child health.

John W. Olsen

John Olsen's research involves cultural ecology and environmental archaeology. He has studied Eastern hemisphere prehistory with a temporal and geographical focus on the Paleolithic archaeology of Central and East Asia, and the impact of environmental degradation on prehistoric societies in arid zones. His work also involves spatial analysis in archaeology, including applications of remote sensing and geographic information systems.

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