Phone: 970-491-8350 Fax: 970-491-8483 Email: sonia (at) atmos.colostate.edu Research Web Site Publications

• Ph.D. in Chemical Engineering - 1989 - California Institute of Technology - Pasadena, CA
• M.S. in Chemical Engineering - 1985 - California Institute of Technology - Pasadena, CA
• B.S. in Chemical Engineering - 1983 - Manhattan College - Riverdale, NY

Professor Kreidenweis joined the CSU Department of Atmospheric Science in the fall of 1991 to initiate and head the new Atmospheric Chemistry program. The program offers a range of introductory and advanced courses in atmospheric chemistry, aerosol physics, and air pollution. It also provides teaching and research laboratories for chemical phase measurements including the CSU Dynamic Cloud Chamber. Associated research programs include aerosol characterization, aerosol-cloud interactions, cloud microphysics, cloud modification, and instrument development. Before coming to CSU, Professor Kreidenweis held a faculty position in the Department of Chemical Engineering at San Jose State University where she received the Meritorious Performance and Professional Promise Award for two consecutive years for her accomplishments in research and teaching.

• Tropospheric chemistry
• Aerosol dynamics
• Aerosol-cloud-climate interactions
• Visibility

Professor Kreidenweis focuses her research activities on the nature and behavior of particulate matter in the atmosphere and its effects on climate and visibility. Her research program consists of an experimental component that includes both laboratory and field measurements as well as a modeling component. The experimental component focuses on characterizing physical properties of aerosols.

Professor Kreidenweis' research group participated in the 1992 ASTEX and 1995 ACE-1 field campaigns measuring marine aerosol concentration and size distributions. The data obtained were used to examine the role of aerosols in the marine sulfur cycle and the role of clouds in processing atmospheric particulate matter. The data also helped develop a database of global aerosol characteristics that other researchers can use to study climate change issues. The research group has also participated in several studies aimed at understanding visibility degradation in national parks including the 1995 Southeastern Aerosol and Visibility Study in Great Smoky Mountains National Park and the 1999 Big Bend Aerosol and Visibility Observational Study. In these studies, measurements of aerosol number concentrations, size distribution, and hygroscopicity were used to study the relationships between sources of particulate matter, particle properties, meteorology, and visibility.

Members of Professor Kreidenweis' group have also taken part in several airborne missions that addressed the relationships between aerosols and formation of ice in the atmosphere. The 1996 SUCCESS mission examined the effects of aircraft emissions on contrail and cirrus cloud formation and deployed the first airborne continuous ice nucleus counter developed by collegues at CSU. The 1999 FIRE-Arctic mission in Alaska also used the counter to examine links between particles and ice clouds. The results of experiments using the counter have important implications for hypotheses that relate increased anthropogenic aerosol emissions to changes in cirrus cloud coverage and optical properties.

Through collaboration with colleagues at other universities and laboratories, Professor Kreidenweis and her research group have developed aerosol-cloud interaction models for marine stratocumulus and continental convective systems which examine processing and redistribution of atmospheric gases and particulate matter in clouds. She is also interested in using satellite and lidar data, especially in situ measurements, to better understand and model the properties of the detected particles and their effects on the global radiation budget.

• National Science Foundation (NSF)
• National Aeronautics and Space Administration (NASA)
• National Oceanic and Atmospheric Administration (NOAA)
• National Park Service (NPS)

• Meritorious Performance and Professional Promise Award
• Lawrence Livermore National Laboratory Atmospheric and Geophysical Sciences Division - Consultant
• CSU Engineering Dean's Council Award - 1995
• Cooperative Institute for Research in the Atmosphere (CIRA) - Fellow
• USRA / Goddard Space Flight Center Visiting Fellow Award - 1999
• Office of Naval Research Young Investigator Award - 1993
• American Association for Aerosol Research - Member and Vice-President Elect
• National Research Council Committee on Atmospheric Chemistry - Member