Carnegie Mellon University
March 26, 2013

Department Seminar

Department Seminar

Aerosol-Cloud Effects in Eastern Pacific Experiments

Lynn RussellScripps Institution of Oceanography / UCSD
Friday, March 29, 2013 4:30PM - Porter Hall 100
Reception to follow in Tung Au Lab, Porter Hall 107E

Aerosol-cloud-radiation interactions are widely held to be the largest single source of uncertainty in climate model projections of future climate change due to increasing anthropogenic emissions. There has been significant progress with both observations and models on these important questions. However, while the qualitative aspects of the indirect effects of aerosols on clouds are well known, the quantitative representation of these processes is nontrivial and limits our ability to represent them in global climate models. The Eastern Pacific Emit- ted Aerosol Cloud Experiment (E-PEACE) 2011 was a targeted aircraft cam- paign with embedded modeling studies, using the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter aircraft and the R/V Point Sur in July 2011 off the coast of Monterey, California, with a full payload of instruments to measure particle and cloud number, mass, composition, and water uptake distributions. In this talk, I will summarize three central aspects of the collaborative E-PEACE results: (1) the chemistry and microphysics of the emitted smoke particles compared to ship-track-forming cargo ship emissions, with particular attention to the role of organic particles, (2) the characteristics and frequency of track formation for smoke and cargo ships, as well as the role of multi-layered low clouds, and (3) the implications of these findings for quan- tifying aerosol indirect effects. In addition, I will present the preliminary results of the Stratocumulus Observations of Los-Angeles Emissions Derived Aerosol- Droplets (SOLEDAD) 2012 that compare the effective measured supersatura- tions of the clouds measured in these experiments.

Lynn M. Russell is Professor of Atmospheric Chemistry at Scripps Institution of Oceanography on the faculty of Uni- versity of California at San Diego, where she has led the Climate Sciences Curricular Group since 2009. Her research is in the area of aerosol particle chemistry, including the behavior of particles from both biogenic and combustion process- es. Her research group pursues both modeling and measurement studies of atmospheric aerosols, using the combina- tion of these approaches to advance our understanding of fundamental processes that affect atmospheric aerosols. She completed her undergraduate work at Stanford University, and she received her Ph.D. in Chemical Engineering from the California Institute of Technology for her studies of marine aerosols. Her postdoctoral work as part of the National Center for Atmospheric Research Advanced Studies Program investigated aerosol and trace gas flux and entrainment in the marine boundary layer. She served on the faculty of Princeton University in the Department of Chemical Engineer- ing before accepting her current position at Scripps in 2003. She has been honored with young investigator awards from ONR, NASA, Dreyfus Foundation, NSF, and the James S. McDonnell Foundation, and she received the Kenneth T. Whitby Award from AAAR (2003) for her contributions on atmospheric aerosol processes and the Princeton Rheinstein Award for excellence in teaching and scholarship (1998). She has been a member of AAAR since 1993 and served on the AAAR Board of Directors from 2001 to 2004, as AAAR Conference Chair in 2011, and as AAAR Treasurer since 2012.