Research

A 10-meter dust flux tower installed at the Iron King tailings impoundment (Mackenzie Russell, 2011).

Aerosols

My research group is studying aerosols (airborne particulate matter) associated with mining activity such as wind-blown dust from mine tailings impoundments, and smelting process emissions.  We operate aerosol sampling equipment including MOUDIs and an SMPS analyzer at two field sites contaminated with arsenic and lead:  the Iron King mine tailings near Dewey-Humboldt, Arizona; and the ASARCO copper mine and smelter in Hayden, Arizona (Journal of Water Air and Soil Pollution, 221, 145-157, 2011).


SERI promotora, Lourdes Vea, providing outreach and recognition to small auto repair business owners, Tucson (Denise Moreno, 2011).

Pollution Prevention

I also serve as PI on an EPA Pollution Prevention (P2) grant.  Together with a local non-profit, the Sonora Environmental Research Institute (SERI), we monitor metals in PM10 samples obtained in the south side of Tucson, and train promotoras (community health workers) to visit small businesses and to encourage them to lower emissions of air toxics, and to reduce water use.


Construction and testing a 2-m parabolic solar concentrator, a joint project of the University of Arizona and Raytheon Corporation (2009).

Solar Energy

We are developing forecasting capability for direct normal solar insolation using the Weather Research Forecast model; and we are examining the effects of atmospheric aerosols on solar radiation received at the surface using a high resolution spectrophotometer to make daily observations.  Work on a solar concentrator/photovoltaic array with Roger Angel (co-PI) and Raytheon Corp. was completed in 2010.  A 2-m diameter mirror was assembled, fitted to a solar tracker, and installed and tested at a Raytheon facility near the airport.  The project was largely supported by SFAz.


 

Ozone concentrations (ppbv) measured over Lake Michigan during the LADCO airplane project, 1994-2003 (Atmos. Environ., 45, 3192-3202, 2011).

Air Quality

There is great interest in better understanding the factors affecting air quality in the Great Lakes region because of the long, ongoing history of ozone exceedances in this densely populated part of the country.  We analyzed airplane data acquired during the 10-year LADCO project to address some fundamental questions such as: What are the concentrations and diurnal patterns of ozone and ozone precursor compounds over the lake; and is ozone formation over Lake Michigan VOC-limited or NOx-limited?