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An Integrated Modeling Study on the Effects of Mineral Dust and Sea Salt Particles on Clouds and Precipitation : Volume 10, Issue 10 (14/10/2010)

By Solomos, S.

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Book Id: WPLBN0003972162
Format Type: PDF Article :
File Size: Pages 56
Reproduction Date: 2015

Title: An Integrated Modeling Study on the Effects of Mineral Dust and Sea Salt Particles on Clouds and Precipitation : Volume 10, Issue 10 (14/10/2010)  
Author: Solomos, S.
Volume: Vol. 10, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Levin, Z., Kallos, G., Nenes, A., Tremback, C., Astitha, M., Kushta, J., & Solomos, S. (2010). An Integrated Modeling Study on the Effects of Mineral Dust and Sea Salt Particles on Clouds and Precipitation : Volume 10, Issue 10 (14/10/2010). Retrieved from http://www.nationalpubliclibrary.info/


Description
Description: University of Athens, School of Physics, University of Athens Campus, Bldg. Phys-5, 15784 Athens, Greece. The amount of airborne particles that will nucleate and form cloud droplets under specific atmospheric conditions, depends on their number concentration, size distribution and chemical composition. Aerosol is affected by primary particle emissions, gas-phase precursors, their transformation and interaction with atmospheric constituents, clouds and dynamics. A comprehensive assessment of these interactions requires an integrated approach; most studies however decouple aerosol processes from cloud and atmospheric dynamics and cannot account for all the feedbacks involved in aerosol-cloud-climate interactions. This study addresses aerosol-cloud-climate interactions with the Integrated Community Limited Area Modeling System (ICLAMS) that includes online parameterization of the physical and chemical processes between air quality and meteorology. ICLAMS is an extended version of the Regional Atmospheric Modeling System (RAMS) and it has been designed for coupled air quality – meteorology studies. Model sensitivity tests for a single-cloud study as well as for a case study over the Eastern Mediterranean illustrate the importance of aerosol properties in cloud formation and precipitation. Mineral dust particles are often coated with soluble material such as sea-salt, thus exhibiting increased CCN efficiency. Increasing the percentage of salt-coated dust particles by 15% in the model resulted in more vigorous convection and more intense updrafts. The clouds that were formed extended about 3 km higher and the initiation of precipitation was delayed by one hour. Including on-line parameterization of the aerosol effects improved the model bias for the twenty-four hour accumulated precipitation by 7%. However, the spatial distribution and the amounts of precipitation varied greatly between the different aerosol scenarios. These results indicate the large portion of uncertainty that remains unresolved and the need for more accurate description of aerosol feedbacks in atmospheric models and climate change predictions.

Summary
An integrated modeling study on the effects of mineral dust and sea salt particles on clouds and precipitation

Excerpt
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