Dr. Gill is an Earth system scientist whose primary scientific interests are in atmosphere-lithosphere interaction, particularly aeolian (wind-related) processes (wind erosion, dust storms, sandstorms, fugitive dust, blowing sand, sand dunes) and atmospheric aerosols (particulate matter, PM10, PM2.5) of geological origin, and their roles in biogeochemical cycling, environmental change, and environmental and human health. Gill's research uses aspects of geomorphology, sedimentology, geochemistry, remote sensing, ecology, wind engineering, and meteorology to study the generation, transport, deposition, and management of aeolian sediments and aerosols, as well as to investigate the interactions and cycling of materials between the atmosphere, lithosphere and biosphere, at all spatial scales.Dr. Gill's research interests also include the environmental geochemistry, source appointment and biogeochemistry of trace elements; the geomorphology, sedimentology, and geochemistry of saline lakes and playas; salt/evaporite mineralogy; earth system science, especially the relationship between landforms, climate/weather, and ecosystems; mesoscale meteorology and air pollution meteorology; the application of X-ray spectrometric techniques and trace element analyses in earth science; natural resource management in arid and semiarid lands; the intersection of art and environmental science; and applications of meteorology to homeland security.