PAHs and SOA versus primary carbonaceous aerosols
We use the chemical transport model GEOS- Chem to evaluate the hypothesis that atmospheric polycyclic aromatic hydrocarbons (PAHs) are trapped in secondary organic aerosol (SOA) as it forms. We test the ability of three different partitioning configurations within the model to reproduce observed tot...
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ftdatacite:10.18739/a2fb4wk6f 2023-05-15T15:10:14+02:00 PAHs and SOA versus primary carbonaceous aerosols Friedman, Carey 2016 text/xml https://dx.doi.org/10.18739/a2fb4wk6f https://arcticdata.io/catalog/view/doi:10.18739/A2FB4WK6F en eng Arctic Data Center PAHs SOA BC organic carbon organic matter long range transport dataset Dataset 2016 ftdatacite https://doi.org/10.18739/a2fb4wk6f 2021-11-05T12:55:41Z We use the chemical transport model GEOS- Chem to evaluate the hypothesis that atmospheric polycyclic aromatic hydrocarbons (PAHs) are trapped in secondary organic aerosol (SOA) as it forms. We test the ability of three different partitioning configurations within the model to reproduce observed total concentrations in the midlatitudes and the Arctic as well as midlatitude gas-particle phase distributions. The configurations tested are (1) the GEOS- Chem default configuration, which uses instantaneous equilibrium partitioning to divide PAHs among the gas phase, a primary organic matter (OM) phase (absorptive), and a black carbon (BC) phase (adsorptive), (2) an SOA configuration in which PAHs are trapped in SOA when emitted and slowly evaporate from SOA thereafter, and (3) a configuration in which PAHs are trapped in primary OM/BC upon emission and subsequently slowly evaporate. We also test the influence of changing the fraction of PAHs available for particle-phase oxidation. Trapping PAHs in SOA particles upon formation and protecting against particle-phase oxidation (2) better simulates observed remote concentrations compared to our default configuration (1). However, simulating adsorptive partitioning to BC is required to reproduce the magnitude and seasonal pattern of gasâ particle phase distributions. Thus, the last configuration (3) results in the best agreement between observed and simulated concentration/phase distribution data. The importance of BC rather than SOA to PAH transport is consistent with strong observational evidence that PAHs and BC are coemitted. Dataset Arctic black carbon DataCite Metadata Store (German National Library of Science and Technology) Arctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
PAHs SOA BC organic carbon organic matter long range transport |
spellingShingle |
PAHs SOA BC organic carbon organic matter long range transport Friedman, Carey PAHs and SOA versus primary carbonaceous aerosols |
topic_facet |
PAHs SOA BC organic carbon organic matter long range transport |
description |
We use the chemical transport model GEOS- Chem to evaluate the hypothesis that atmospheric polycyclic aromatic hydrocarbons (PAHs) are trapped in secondary organic aerosol (SOA) as it forms. We test the ability of three different partitioning configurations within the model to reproduce observed total concentrations in the midlatitudes and the Arctic as well as midlatitude gas-particle phase distributions. The configurations tested are (1) the GEOS- Chem default configuration, which uses instantaneous equilibrium partitioning to divide PAHs among the gas phase, a primary organic matter (OM) phase (absorptive), and a black carbon (BC) phase (adsorptive), (2) an SOA configuration in which PAHs are trapped in SOA when emitted and slowly evaporate from SOA thereafter, and (3) a configuration in which PAHs are trapped in primary OM/BC upon emission and subsequently slowly evaporate. We also test the influence of changing the fraction of PAHs available for particle-phase oxidation. Trapping PAHs in SOA particles upon formation and protecting against particle-phase oxidation (2) better simulates observed remote concentrations compared to our default configuration (1). However, simulating adsorptive partitioning to BC is required to reproduce the magnitude and seasonal pattern of gasâ particle phase distributions. Thus, the last configuration (3) results in the best agreement between observed and simulated concentration/phase distribution data. The importance of BC rather than SOA to PAH transport is consistent with strong observational evidence that PAHs and BC are coemitted. |
format |
Dataset |
author |
Friedman, Carey |
author_facet |
Friedman, Carey |
author_sort |
Friedman, Carey |
title |
PAHs and SOA versus primary carbonaceous aerosols |
title_short |
PAHs and SOA versus primary carbonaceous aerosols |
title_full |
PAHs and SOA versus primary carbonaceous aerosols |
title_fullStr |
PAHs and SOA versus primary carbonaceous aerosols |
title_full_unstemmed |
PAHs and SOA versus primary carbonaceous aerosols |
title_sort |
pahs and soa versus primary carbonaceous aerosols |
publisher |
Arctic Data Center |
publishDate |
2016 |
url |
https://dx.doi.org/10.18739/a2fb4wk6f https://arcticdata.io/catalog/view/doi:10.18739/A2FB4WK6F |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic black carbon |
genre_facet |
Arctic black carbon |
op_doi |
https://doi.org/10.18739/a2fb4wk6f |
_version_ |
1766341282359148544 |