Impact of gas-to-particle partitioning approaches on the simulated radiative effects of biogenic secondary organic aerosol

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Scott , C E , Spracklen , D V , Pierce , J R , Riipinen , I , D'Andrea , S D , Rap , A , Carslaw , K S , Forster , P M , Artaxo , P , Kulmala , M , Rizzo , L V , Swietlicki , E , Mann , G W & Pringle , K J 2015 , ' Impact of gas-to-particle partitioning approaches on the simulated radiative effects of biogenic secondary organic aerosol ' Atmospheric Chemistry and Physics , vol. 15 , no. 22 , pp. 12989-13001 . DOI: 10.5194/acp-15-12989-2015

Title: Impact of gas-to-particle partitioning approaches on the simulated radiative effects of biogenic secondary organic aerosol
Author: Scott, C. E.; Spracklen, D. V.; Pierce, J. R.; Riipinen, I.; D'Andrea, S. D.; Rap, A.; Carslaw, K. S.; Forster, P. M.; Artaxo, P.; Kulmala, M.; Rizzo, L. V.; Swietlicki, E.; Mann, G. W.; Pringle, K. J.
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research
Date: 2015
Language: eng
Number of pages: 13
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/175022
Abstract: The oxidation of biogenic volatile organic compounds (BVOCs) gives a range of products, from semi-volatile to extremely low-volatility compounds. To treat the interaction of these secondary organic vapours with the particle phase, global aerosol microphysics models generally use either a thermodynamic partitioning approach (assuming instant equilibrium between semi-volatile oxidation products and the particle phase) or a kinetic approach (accounting for the size dependence of condensation). We show that model treatment of the partitioning of biogenic organic vapours into the particle phase, and consequent distribution of material across the size distribution, controls the magnitude of the first aerosol indirect effect (AIE) due to biogenic secondary organic aerosol (SOA). With a kinetic partitioning approach, SOA is distributed according to the existing condensation sink, enhancing the growth of the smallest particles, i.e. those in the nucleation mode. This process tends to increase cloud droplet number concentrations in the presence of biogenic SOA. By contrast, an approach that distributes SOA according to pre-existing organic mass restricts the growth of the smallest particles, limiting the number that are able to form cloud droplets. With an organically mediated new particle formation mechanism, applying a mass-based rather than a kinetic approach to partitioning reduces our calculated global mean AIE due to biogenic SOA by 24 %. Our results suggest that the mechanisms driving organic partitioning need to be fully understood in order to accurately describe the climatic effects of SOA.
Subject: NUCLEATION MODE PARTICLES
CHEMICAL-TRANSPORT MODEL
CLOUD DROPLET FORMATION
GLOBAL CLIMATE MODELS
NUMBER CONCENTRATIONS
CCN CONCENTRATIONS
BOUNDARY-LAYER
SULFURIC-ACID
GLOMAP-MODE
GROWTH
114 Physical sciences
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