Informace o publikaci

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

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MU Qing SHIRAIWA Manabu OCTAVIANI Mega MA Nan DING Aijun SU Hang LAMMEL Gerhard POSCHL Ulrich CHENG Yafang

Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Science advances
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.ncbi.nlm.nih.gov/pubmed/29750188
Doi http://dx.doi.org/10.1126/sciadv.aap7314
Klíčová slova POLYCYCLIC AROMATIC-HYDROCARBONS; SECONDARY ORGANIC AEROSOLS; GAS-PARTICLE INTERACTIONS; KINETIC MULTILAYER MODEL; LONG-RANGE TRANSPORT; GLOBAL DISTRIBUTION; BULK DIFFUSION; CANCER-RISK; OZONE; SURFACE
Popis 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 multi-phase 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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