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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Scott, C. E. [1] ; Spracklen, D. V. [1] ; Pierce, J. R. [2] ; Riipinen, I. [3, 4] ; D'Andrea, S. D. [2] ; Rap, A. [1] ; Carslaw, K. S. [1] ; Forster, P. M. [1] ; Artaxo, P. [5] ; Kulmala, M. [6] ; Rizzo, L. V. [7] ; Swietlicki, E. [8, 9] ; Mann, G. W. [1, 10] ; Pringle, K. J. [1]
Total Authors: 14
[1] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire - England
[2] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 - USA
[3] Stockholm Univ, Dept Appl Environm Sci, S-10691 Stockholm - Sweden
[4] Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm - Sweden
[5] Univ Sao Paulo, Inst Phys, Sao Paulo - Brazil
[6] Univ Helsinki, Dept Phys, FIN-00014 Helsinki - Finland
[7] Univ Fed Sao Paulo, UNIFESP, Inst Environm Chem & Pharmaceut Sci, Dept Earth & Exact Sci, Diadema - Brazil
[8] Lund Univ, Div Nucl Phys, S-22100 Lund - Sweden
[9] Lund Univ, Ctr Environm & Climate Res, S-22100 Lund - Sweden
[10] Univ Leeds, Natl Ctr Atmospher Sci, Leeds LS2 9JT, W Yorkshire - England
Total Affiliations: 10
Document type: Journal article
Source: Atmospheric Chemistry and Physics; v. 15, n. 22, p. 12989-13001, 2015.
Web of Science Citations: 18

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. (AU)

FAPESP's process: 08/58100-2 - Aeroclima: direct and indirect effects of aerosols on climate in Amazonia and Pantanal
Grantee:Paulo Eduardo Artaxo Netto
Support type: Research Program on Global Climate Change - Thematic Grants