Calendar Event Details

610 Atmospheres Seminar: Lynn M. Russell

Affiliation: Scripps/UCSD, La Jolla, CA
Event Date: Thursday, January 17, 2013

Location: B33:H114
Time: 3:30 PM

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Aerosol-Cloud Effects in Eastern Pacific Experiments

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. The underlying causes of this uncertainty among modeled predictions of climate are the gaps in our fundamental understanding of cloud processes. 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 Emitted Aerosol Cloud Experiment (E-PEACE) 2011 was a targeted aircraft campaign 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, (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 quantifying both existing aerosol indirect effects and possible geoengineering effectiveness.  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 supersaturations of the clouds measured in these experiments.

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Posted or updated: Friday, January 4, 2013

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