Visibility Degradation Content https://aqrc.ucdavis.edu/ Visibility Degradation Content for Air Quality Research Center en Thomas A. Cahill https://aqrc.ucdavis.edu/people/thomas-cahill <p>Prof. Tom Cahill spent five decades characterizing aerosols via nuclear analysis, ensconced in circa 270 peer reviewed publications. He designed and ran the IMPROVE network from 1977-1997, and was a director of Crocker Nuclear Laboratory. He mentored hundreds of students as a faculty member at UC Davis and published several books spanning from new techniques of ion accelerators to science fiction adventures. He passed away in May of 2019.</p> <p> </p> February 20, 2018 - 9:29am Serena Tan https://aqrc.ucdavis.edu/people/thomas-cahill Christopher Cappa https://aqrc.ucdavis.edu/people/christopher-cappa <h2>Research Interests</h2> <ul><li><em><strong>Urban and Regional Smog</strong></em> - Laboratory measurements of physical properties of atmospheric particulate matter and their chemical evolution.</li> <li><em><strong>Visibility Degradation</strong></em> - Field measurements of optical properties of particles in urban and rural environments.</li> <li><em><strong>Global Climate Change</strong></em> - Optical properties (absorption, scattering) of particles and how they are affected by chemical and physical transformations in the atmosphere</li> </ul><h2>Research Summary</h2> <p>My researc February 09, 2018 - 10:44am Serena Tan https://aqrc.ucdavis.edu/people/christopher-cappa Ann M. Dillner https://aqrc.ucdavis.edu/people/ann-m-dillner <h2>Research Interests</h2> <ul><li><strong><em>Health Effects</em></strong> - Chemical characterization of potentially toxic or carcinogenic particulate matter, new technique development to characterize organic functional groups using FTIR and characterize elements using high-volume sampler and ICP-MS, radical generation due to particles in surrogate lung fluid.</li> <li><em><strong>Urban and Regional Smog</strong></em> - Laboratory studies of the formation of secondary organic aerosols.</li> <li><em><strong>Visibility Degradation</strong></em> - Work with the IMPROVE group at UCDavis whic February 09, 2018 - 10:32am Serena Tan https://aqrc.ucdavis.edu/people/ann-m-dillner Ajith Kaduwela https://aqrc.ucdavis.edu/people/ajith-kaduwela <h2>Research Interest</h2> <ul><li><strong><em>Urban and Regional Smog</em></strong> - Mathematical modeling of ozone and particulate matter in the urban and regional scales</li> <li><em><strong>Visibility Degradation</strong></em> - Visibility degradation, its cause, and remediation</li> <li><em><strong>Global Climate Change</strong></em> - Effects of global climate change on future air quality</li> </ul><h2>Research Summary</h2> <p>My research focuses on the regulatory applications of photochemical air quality and prognostic meteorology models. February 09, 2018 - 10:14am Serena Tan https://aqrc.ucdavis.edu/people/ajith-kaduwela Michael Kleeman https://aqrc.ucdavis.edu/people/michael-kleeman <h2>Research Interest</h2> <ul><li><em><strong>Health Effects</strong></em> - Characterization and source apportionment of airborne particles in fine and ultrafine size fractions.</li> <li><em><strong>Transportation</strong></em> - Measurement of particle size and composition in tailpipe emissions.</li> <li><em><strong>Urban and Regional Smog</strong></em> - Source-oriented airshed modeling for California and the eastern U.S.</li> <li><em><strong>Visibility Degradation</strong></em> - Source contributions to visibility reduction in California.</li> <li><em><strong>Agricultural Emissions - February 09, 2018 - 10:10am Serena Tan https://aqrc.ucdavis.edu/people/michael-kleeman Qi Zhang https://aqrc.ucdavis.edu/people/qi-zhang <p>We conduct field measurements and laboratory studies with a main goal to understand the chemical and physical properties, sources, and lifecycle processes of aerosol particles and fog/cloud droplets in the atmosphere. We also perform integrated analyses of worldwide aerosol mass spectrometry datasets to improve understanding and modeling of aerosol chemistry and climatology. In addition, we develop instruments and data analysis techniques to study the chemistry of organics in airborne PM and droplets.  </p> January 23, 2018 - 10:38am Serena Tan https://aqrc.ucdavis.edu/people/qi-zhang Keith Bein https://aqrc.ucdavis.edu/people/keith-bein <p>Dr. Bein received Bachelor of Science degrees in Physics and Chemistry from California State University Chico and his Ph.D. in Atmospheric Sciences at U.C. Davis. He is currently an Associate Professional Researcher at the Air Quality Research Center and a Research Professor at the Center for Health and the Environment at U.C. Davis. January 22, 2018 - 11:24am Serena Tan https://aqrc.ucdavis.edu/people/keith-bein Krystyna Trzepla https://aqrc.ucdavis.edu/people/krystyna-trzepla <p><span><span><span><span><span>I manage a laboratory operations group that performs sample handling and analysis of aerosol samples for the <span><a href="http://air-quality.crocker.ucdavis.edu/">Interagency Monitoring for PROtected Visual Environments (IMPROVE)</a></span> and Chemical Speciation Network (CSN) programs.  We are responsible for deployment of filters, collection of samples, and analysis of samples collected at approximately 160 sites (IMPROVE) and 130 sites (CSN).  In our laboratories, we perform gravimetric analysis, light absorption analysis, OC/EC analysis and X-Ray Fluores January 08, 2018 - 3:39pm Sandra Hall https://aqrc.ucdavis.edu/people/krystyna-trzepla Warren H. White https://aqrc.ucdavis.edu/people/warren-h-white <h2>Research Interests</h2> <ul><li><em><strong>Health Effects</strong></em> - Exposure assessment, and the effects of measurement error on epidemiological analysis.</li> <li><em><strong>Urban and Regional Smog</strong></em> - Characterization of atmospheric transport and transformation; attribution of particulate matter to sources; characterization of measurement quality.</li> <li><em><strong>Visibility Degradation</strong></em> - Theoretical analysis of radiative transfer and particle optics; analysis of haze composition data; assessment of monitoring and regulatory strategies.</li> <li> December 13, 2017 - 4:17pm Sandra Hall https://aqrc.ucdavis.edu/people/warren-h-white