Environmental & Climate Sciences Department Seminar

"Aerosol-Cloud Interactions: Buffers, Turbulence, and Knowledge Gaps"

Presented by Yangang Liu, Environmental and Climate Sciences Department, Brookhaven National Laboratory

Thursday, March 21, 2019, 11:00 am — John Dunn Seminar Room, Bldg. 463

Despite progress in understanding of aerosol-cloud interactions (ACI) and their representation in climate models, climate models still suffer from large uncertainty in estimated aerosol indirect effects and large discrepancy compared to observations. This tenacious problem poses vital challenges to accurately represent aerosol-cloud interactions even in warm clouds, the apparently simplest of all clouds. In this talk, I will discuss several potentially important yet poorly understood factors that likely compensate/buffer aerosol-cloud interactions as conventionally represented in climate models (e.g., dispersion effect associated with the aerosol-induced changes of the spectral shape of the cloud droplet size distribution; regime dependence of cloud properties on aerosol concentration and updraft velocity; effect of turbulent entrainment-mixing processes; microphysics-turbulence interactions; scale-dependence; process coupling). I will explore the challenges and the main knowledge gaps that are needed to fill to address these challenges, and discuss the approaches that hold potentials to fill the knowledge gaps and address the ACI challenges.

Hosted by: Mike Jensen

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