Implementation of state-of-the-art ternary new-particle formation scheme to the regional chemical transport model PMCAMx-UF in Europe

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Baranizadeh , E , Murphy , B N , Julin , J , Falahat , S , Reddington , C L , Arola , A , Ahlm , L , Mikkonen , S , Fountoukis , C , Patoulias , D , Minikin , A , Hamburger , T , Laaksonen , A , Pandis , S N , Vehkamäki , H , Lehtinen , K E J & Riipinen , I 2016 , ' Implementation of state-of-the-art ternary new-particle formation scheme to the regional chemical transport model PMCAMx-UF in Europe ' , Geoscientific Model Development , vol. 9 , no. 8 , pp. 2741-2754 . https://doi.org/10.5194/gmd-9-2741-2016

Title: Implementation of state-of-the-art ternary new-particle formation scheme to the regional chemical transport model PMCAMx-UF in Europe
Author: Baranizadeh, Elham; Murphy, Benjamin N.; Julin, Jan; Falahat, Saeed; Reddington, Carly L.; Arola, Antti; Ahlm, Lars; Mikkonen, Santtu; Fountoukis, Christos; Patoulias, David; Minikin, Andreas; Hamburger, Thomas; Laaksonen, Ari; Pandis, Spyros N.; Vehkamäki, Hanna; Lehtinen, Kari E. J.; Riipinen, Ilona
Contributor: University of Helsinki, Department of Physics
Date: 2016-08-22
Language: eng
Number of pages: 14
Belongs to series: Geoscientific Model Development
ISSN: 1991-959X
URI: http://hdl.handle.net/10138/167765
Abstract: The particle formation scheme within PMCAMx-UF, a three-dimensional chemical transport model, was updated with particle formation rates for the ternary H2SO4-NH3-H2O pathway simulated by the Atmospheric Cluster Dynamics Code (ACDC) using quantum chemical input data. The model was applied over Europe for May 2008, during which the EUCAARI-LONGREX (European Aerosol Cloud Climate and Air Quality Interactions-Long-Range Experiment) campaign was carried out, providing aircraft vertical profiles of aerosol number concentrations. The updated model reproduces the observed number concentrations of particles larger than 4 nm within 1 order of magnitude throughout the atmospheric column. This agreement is encouraging considering the fact that no semi-empirical fitting was needed to obtain realistic particle formation rates. The cloud adjustment scheme for modifying the photolysis rate profiles within PMCAMx-UF was also updated with the TUV (Tropospheric Ultraviolet and Visible) radiative-transfer model. Results show that, although the effect of the new cloud adjustment scheme on total number concentrations is small, enhanced new-particle formation is predicted near cloudy regions. This is due to the enhanced radiation above and in the vicinity of the clouds, which in turn leads to higher production of sulfuric acid. The sensitivity of the results to including emissions from natural sources is also discussed.
Subject: QUALITY INTERACTIONS EUCAARI
INTEGRATING AEROSOL RESEARCH
BOUNDARY-LAYER NUCLEATION
WILD-LAND FIRES
SULFURIC-ACID
AIR-QUALITY
NUMBER CONCENTRATIONS
SIZE DISTRIBUTION
GLOBAL SCALES
ATMOSPHERIC PARTICLES
114 Physical sciences
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