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

Mu, Qing; Shiraiwa, Manabu; Octaviani, Mega; Ma, Nan; Ding, Aijun; Su, Hang; Lammel, Gerhard; Pöschl, Ulrich; Cheng, Yafang

doi:10.1126/sciadv.aap7314

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

Journal Article · Wed Mar 21 00:00:00 EDT 2018 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aap7314· OSTI ID:1499920

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Max Planck Institute for Chemistry, Mainz (Germany)
Max Planck Institute for Chemistry, Mainz (Germany); Univ. of California, Irvine, CA (United States)
Jinan University, Guangzhou (China); Max Planck Institute for Chemistry, Mainz (Germany)
Nanjing Univ. (China); Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing (China)
Max Planck Institute for Chemistry, Mainz (Germany); Masaryk University, Brno (Czech Republic)
Max Planck Institute for Chemistry, Mainz (Germany); Johannes Gutenberg University Mainz (Germany)
Max Planck Institute for Chemistry, Mainz (Germany); Jinan University, Guangzhou (China)

Polycyclic aromatic hydrocarbons like benzo(a)pyrene (BaP) in atmospheric particulate matter pose a threat to human health because of their high carcinogenicity. In the atmosphere, BaP is mainly degraded through a multiphase reaction with ozone, but the fate and atmospheric transport 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 applied under atmospheric conditions. 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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Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0018349

OSTI ID:: 1499920

Journal Information:: Science Advances, Vol. 4, Issue 3; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 72 works

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