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Aerosol Specification in Single-column Community Atmosphere Model Version 5 : Volume 8, Issue 3 (27/03/2015)

By Lebassi-habtezion, B.

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Book Id: WPLBN0003988408
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Aerosol Specification in Single-column Community Atmosphere Model Version 5 : Volume 8, Issue 3 (27/03/2015)  
Author: Lebassi-habtezion, B.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Lebassi-Habtezion, B., & Caldwell, P. M. (2015). Aerosol Specification in Single-column Community Atmosphere Model Version 5 : Volume 8, Issue 3 (27/03/2015). Retrieved from

Description: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551, USA. Single-column model (SCM) capability is an important tool for general circulation model development. In this study, the SCM mode of version 5 of the Community Atmosphere Model (CAM5) is shown to handle aerosol initialization and advection improperly, resulting in aerosol, cloud-droplet, and ice crystal concentrations which are typically much lower than observed or simulated by CAM5 in global mode. This deficiency has a major impact on stratiform cloud simulations but has little impact on convective case studies because aerosol is currently not used by CAM5 convective schemes and convective cases are typically longer in duration (so initialization is less important). By imposing fixed aerosol or cloud-droplet and crystal number concentrations, the aerosol issues described above can be avoided. Sensitivity studies using these idealizations suggest that the Meyers et al. (1992) ice nucleation scheme prevents mixed-phase cloud from existing by producing too many ice crystals. Microphysics is shown to strongly deplete cloud water in stratiform cases, indicating problems with sequential splitting in CAM5 and the need for careful interpretation of output from sequentially split climate models. Droplet concentration in the general circulation model (GCM) version of CAM5 is also shown to be far too low (~ 25 cm−3) at the southern Great Plains (SGP) Atmospheric Radiation Measurement (ARM) site.

Aerosol specification in single-column Community Atmosphere Model version 5

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