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Analysis of Nucleation Events in the European Boundary Layer Using the Regional Aerosol-climate Model Remo-ham with a Solar Radiation-driven Oh-proxy : Volume 14, Issue 7 (02/04/2014)

By Pietikäinen, J.-p.

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Book Id: WPLBN0003982238
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Analysis of Nucleation Events in the European Boundary Layer Using the Regional Aerosol-climate Model Remo-ham with a Solar Radiation-driven Oh-proxy : Volume 14, Issue 7 (02/04/2014)  
Author: Pietikäinen, J.-p.
Volume: Vol. 14, Issue 7
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Mikkonen, S., Hamed, A., Kulmala, M., Hienola, A. I., Pietikäinen, J., Laaksonen, A., & Birmili, W. (2014). Analysis of Nucleation Events in the European Boundary Layer Using the Regional Aerosol-climate Model Remo-ham with a Solar Radiation-driven Oh-proxy : Volume 14, Issue 7 (02/04/2014). Retrieved from

Description: Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland. This work describes improvements in the regional aerosol-climate model REMO-HAM in order to simulate more realistically the process of atmospheric new particle formation (NPF). As a first modification, a new scheme was implemented to simulate OH radical concentrations, now using a proxy approach based on observations and also accounting for the effects of clouds upon OH concentrations. Second, the nucleation rate calculation was modified to directly simulate the formation rates of 3 nm particles, which removes some unnecessary steps in formation rate calculations used earlier in the model. Using the updated model version, the NPF over Europe was simulated for the comprehensive periods 2003–2004 and 2008–2009. The statistics of the simulated particle formation events were subsequently compared to observations from 13 ground-based measurement sites. The new model shows improved agreement with the observed NPF rates compared to former versions and can simulate the event statistics realistically for most parts of Europe. It is our conclusion that further modifications of the OH proxy that reflect the diverse atmospheric composition across Europe have the potential to further improvements.

Analysis of nucleation events in the European boundary layer using the regional aerosol-climate model REMO-HAM with a solar radiation-driven OH-proxy

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