Seminar: Aerosol and Cloud Microphysics in the Community Atmospheric Model (CAM5)
|Title:||Aerosol and Cloud Microphysics in the Community Atmospheric Model CAM5: Evaluation and Aerosol-Cloud-Precipitation Interactions|
Dr. Xiaohong Liu
Climate Physics ScientistPacific Northwest National Laboratory
|Date:||Wednesday, April 24th, 2013|
|Time:||11 am – 12 noon|
|Location:||Argonne National Laboratory|
TCS Building 240
In this talk, Dr. Liu will introduce an aerosol module and aerosol-cloud interaction parameterizations in NCAR Community Atmospheric Model version 5 (CAM5). The modal aerosol module (MAM) in CAM5 predicts both aerosol mass and number, as well as internal/external mixing between aerosol components. The interface of aerosol with a two-moment stratiform cloud microphysics scheme includes droplet activation in warm clouds and ice nucleation in mixed-phase and cold ice clouds.
Dr. Liu will also present an evaluation of aerosol and cloud microphysics predictions from CAM5 with observations. First, the modeled low bias in black carbon concentrations in remote regions (e.g., the Arctic) is clearly due to the too-strong aerosol wet scavenging. Second, cloud microphysics in CAM5 captures the cloud structure and liquid/ice partitioning in mixed-phase clouds evaluated with the DOE ARM Mixed-Phase Arctic Cloud Experiment (M-PACE) observations. Finally, CAM5 is used to study the anthropogenic aerosol effect on the hydrological cycle in East Asia.