Modeling secondary organic aerosol formation through cloud processing of organic compounds
Autor: | Alf Grini, Pierre Tulet, Robert J. Griffin, Jianjun Chen |
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Přispěvatelé: | Institute for Study of Earth, Oceans and Space, University of New Hampshire (UNH), Department of Earth Sciences [UNH Durham], Department of Geosciences [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Équipe Troposphère, Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Groupe d'étude de l'atmosphère météorologique (CNRM-GAME), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2007 |
Předmět: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere Atmospheric Science Aqueous solution 010504 meteorology & atmospheric sciences Cloud processing Chemistry 010501 environmental sciences 7. Clean energy 01 natural sciences lcsh:QC1-999 Aerosol lcsh:Chemistry Troposphere lcsh:QD1-999 Organic reaction 13. Climate action Environmental chemistry Atmospheric chemistry 11. Sustainability Air quality index lcsh:Physics 0105 earth and related environmental sciences CMAQ |
Zdroj: | Atmospheric Chemistry and Physics Discussions Atmospheric Chemistry and Physics Discussions, 2007, 7 (3), pp.8951-8982 Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2007, 7 (3), pp.8951-8982 Atmospheric Chemistry and Physics Atmospheric Chemistry and Physics, European Geosciences Union, 2007, 7 (20), pp.5355 Atmospheric Chemistry and Physics, Vol 7, Iss 20, Pp 5343-5355 (2007) Atmospheric Chemistry and Physics, 2007, 7 (20), pp.5355 |
ISSN: | 1680-7324 1680-7367 1680-7375 1680-7316 |
Popis: | Interest in the potential formation of secondary organic aerosol (SOA) through reactions of organic compounds in condensed aqueous phases is growing. In this study, the potential formation of SOA from irreversible aqueous-phase reactions of organic species in clouds was investigated. A new proposed aqueous-phase chemistry mechanism (AqChem) is coupled with the existing gas-phase Caltech Atmospheric Chemistry Mechanism (CACM) and the Model to Predict the Multiphase Partitioning of Organics (MPMPO) that simulate SOA formation. AqChem treats irreversible organic reactions that lead mainly to the formation of carboxylic acids, which are usually less volatile than the corresponding aldehydic compounds. Zero-dimensional model simulations were performed for tropospheric conditions with clouds present for three consecutive hours per day. Zero-dimensional model simulations show that 48-h average SOA formation is increased by 27% for a rural scenario with strong monoterpene emissions and 7% for an urban scenario with strong emissions of aromatic compounds, respectively, when irreversible organic reactions in clouds are considered. AqChem was also incorporated into the Community Multiscale Air Quality Model (CMAQ) version 4.4 with CACM/MPMPO and applied to a previously studied photochemical episode (3–4 August 2004) focusing on the eastern United States. The CMAQ study indicates that the maximum contribution of SOA formation from irreversible reactions of organics in clouds is 0.28 μg m−3 for 24-h average concentrations and 0.60 μg m−3 for one-hour average concentrations at certain locations. On average, domain-wide surface SOA predictions for the episode are increased by 9% when irreversible, in-cloud processing of organics is considered. Because aldehydes of carbon number greater than four are assumed to convert fully to the corresponding carboxylic acids upon reaction with OH in cloud droplets and this assumption may overestimate carboxylic acid formation from this reaction route, the present study provides an upper bound estimate of SOA formation via this pathway. |
Databáze: | OpenAIRE |
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