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  Temperature effect on phase state and reactivity controls atmospheric multiphase chemistry and transport of PAHs

Mu, Q., Shiraiwa, M., Octaviani, M., Ma, N., Ding, A., Su, H., et al. (2018). Temperature effect on phase state and reactivity controls atmospheric multiphase chemistry and transport of PAHs. Science Advances, 4(3): eaap7314. doi:10.1126/sciadv.aap7314.

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 Creators:
Mu, Qing1, Author              
Shiraiwa, Manabu2, Author
Octaviani, Mega1, Author              
Ma, Nan1, Author              
Ding, Aijun2, Author
Su, Hang1, Author              
Lammel, Gerhard1, Author              
Pöschl, Ulrich1, Author              
Cheng, Yafang1, Author              
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2external, ou_persistent22              

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 Abstract: Polycyclic aromatic hydrocarbons like benzo( a )pyrene (BaP) in atmospheric particulate matter pose a threat to human health because of their high carcinogenicity. In th e atmosphere, BaP is mainly degraded through a multi- phase reaction with ozone, but the fate and atmospheric tra nsport of BaP are poorly characterized. Earlier modeling studies used reaction rate coefficients determined in laboratory experiments at room temperature, which may overestimate/underestimate degradation rates when appl ied under atmospheric condi tions. Moreover, the effects of diffusion on the particle bulk are not well constrained, leading to large discrepancies between model results and observations. We show how regional and global distributions and transport of BaP can be explained by a new kinetic scheme that provides a realistic description of the temperature and humidity dependence of phase state, diffusivity, and reactivity of BaP-containing particles. Low temperature and humidity can substantially increase the lifetime of BaP and enhance its atmospheric dispersion through both the planetary boundary layer and the free troposphere. The new scheme greatly improves the performance of multiscale models, leading to better agreement with observed BaP concentrations in both source regions and remote regions (Arctic), which cannot be achieved by less-elaborate degradation schemes (deviations by multiple orders of magnitude). Our results highlight the importance of considering temperature and humidity effects on both the phase state of aerosol particles and the chemical reactivity of particulate air pollutants.

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 Dates: 2018
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000431373300014
DOI: 10.1126/sciadv.aap7314
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: 8 Volume / Issue: 4 (3) Sequence Number: eaap7314 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548