Environmental Science Division (EVS)a Division of Argonne National Laboratory

Seminar: Aerosol and Cloud Microphysics in the Community Atmospheric Model (CAM5)

April 24, 2013

Title:Aerosol and Cloud Microphysics in the Community Atmospheric Model CAM5: Evaluation and Aerosol-Cloud-Precipitation Interactions
Dr. Xiaohong Liu
Climate Physics Scientist
Pacific Northwest National Laboratory
Photo of Dr. Xiaohong Liu
Date:Wednesday, April 24th, 2013
Time:11 am – 12 noon
Location:Argonne National Laboratory
TCS Building 240
Room 1416

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.

[Source: ARM Climate Research Facility]
portrait of Scott Collis