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Global Simulations of Aerosol Processing in Clouds : Volume 8, Issue 23 (02/12/2008)

By Hoose, C.

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Book Id: WPLBN0003982421
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Global Simulations of Aerosol Processing in Clouds : Volume 8, Issue 23 (02/12/2008)  
Author: Hoose, C.
Volume: Vol. 8, Issue 23
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hoose, C., Lesins, G., Lohmann, U., Bennartz, R., & Croft, B. (2008). Global Simulations of Aerosol Processing in Clouds : Volume 8, Issue 23 (02/12/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland. An explicit and detailed representation of in-droplet and in-crystal aerosol particles in stratiform clouds has been introduced in the global aerosol-climate model ECHAM5-HAM. The new scheme allows an evaluation of the cloud cycling of aerosols and an estimation of the relative contributions of nucleation and collision scavenging, as opposed to evaporation of hydrometeors in the global aerosol processing by clouds. On average an aerosol particle is cycled through stratiform clouds 0.5 times. The new scheme leads to important changes in the simulated fraction of aerosol scavenged in clouds, and consequently in the aerosol wet deposition. In general, less aerosol is scavenged into clouds with the new prognostic treatment than what is prescribed in standard ECHAM5-HAM. Aerosol concentrations, size distributions, scavenged fractions and cloud droplet concentrations are evaluated and compared to different observations. While the scavenged fraction and the aerosol number concentrations in the marine boundary layer are well represented in the new model, aerosol optical thickness, cloud droplet number concentrations in the marine boundary layer and the aerosol volume in the accumulation and coarse modes over the oceans are overestimated. Sensitivity studies suggest that a better representation of below-cloud scavenging, higher in-cloud collision coefficients, or a reduced water uptake by seasalt aerosols could reduce these biases.

Summary
Global simulations of aerosol processing in clouds

Excerpt
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