Is the size distribution of urban aerosols determined by thermodynamic equilibrium? An application to Southern California. Moya, M., Pandis, S., N., & Jacobson, M., Z. Atmos. Environ., 36:2349-2365, 2002. abstract bibtex A size-resolved equilibrium model, SELIQUID, is
presented and used to simulate the size-composition distribution of
semi-volatile inorganic aerosol in an urban environment. The model
uses the efflorescence branch of aerosol behavior to predict the
equilibrium partitioning of the aerosol components between the gas
phase and a size-resolved aerosol population over the entire RH
domain. Predictions of SELIQUID are compared against size-resolved
composition measurements at different locations during the Southern
California Air Quality Study. Based on the modeling results, the
size distribution of sub-micrometer nitrate and ammonium can be
determined by thermodynamic equilibrium when the RH > 60%. In
cases where the RH < 60%, the assumption that all aerosol
particles are metastable liquid solutions may introduce
unacceptable errors. On the other hand, the equilibrium assumption,
in some cases at least, introduces errors in the calculation of the
coarse (particles with diameter <1 mum or so) nitrate and ammonium
that increase with particle size. Finally, the inclusion of crustal
species is important in modeling the size distribution of coarse
inorganic aerosols when the concentration of these species is high.
The effect of these crustal species can be complex and
counterintuitive. (C) 2002 Published by Elsevier Science Ltd.
C1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA
15213 USA. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City, DF,
Mexico. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA
94305 USA.
@article{
title = {Is the size distribution of urban aerosols determined by thermodynamic equilibrium? An application to Southern California},
type = {article},
year = {2002},
pages = {2349-2365},
volume = {36},
id = {3ff86274-b21c-3a6a-98e0-fb5ab3f2972b},
created = {2014-10-08T16:28:18.000Z},
file_attached = {false},
profile_id = {363623ef-1990-38f1-b354-f5cdaa6548b2},
group_id = {02267cec-5558-3876-9cfc-78d056bad5b9},
last_modified = {2017-03-14T17:32:24.802Z},
read = {false},
starred = {false},
authored = {false},
confirmed = {true},
hidden = {false},
citation_key = {Moya:AE:2002a},
source_type = {article},
private_publication = {false},
abstract = {A size-resolved equilibrium model, SELIQUID, is
presented and used to simulate the size-composition distribution of
semi-volatile inorganic aerosol in an urban environment. The model
uses the efflorescence branch of aerosol behavior to predict the
equilibrium partitioning of the aerosol components between the gas
phase and a size-resolved aerosol population over the entire RH
domain. Predictions of SELIQUID are compared against size-resolved
composition measurements at different locations during the Southern
California Air Quality Study. Based on the modeling results, the
size distribution of sub-micrometer nitrate and ammonium can be
determined by thermodynamic equilibrium when the RH > 60%. In
cases where the RH < 60%, the assumption that all aerosol
particles are metastable liquid solutions may introduce
unacceptable errors. On the other hand, the equilibrium assumption,
in some cases at least, introduces errors in the calculation of the
coarse (particles with diameter <1 mum or so) nitrate and ammonium
that increase with particle size. Finally, the inclusion of crustal
species is important in modeling the size distribution of coarse
inorganic aerosols when the concentration of these species is high.
The effect of these crustal species can be complex and
counterintuitive. (C) 2002 Published by Elsevier Science Ltd.
C1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA
15213 USA. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City, DF,
Mexico. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA
94305 USA.},
bibtype = {article},
author = {Moya, M and Pandis, S N and Jacobson, M Z},
journal = {Atmos. Environ.}
}
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An application to Southern California","type":"article","year":"2002","pages":"2349-2365","volume":"36","id":"3ff86274-b21c-3a6a-98e0-fb5ab3f2972b","created":"2014-10-08T16:28:18.000Z","file_attached":false,"profile_id":"363623ef-1990-38f1-b354-f5cdaa6548b2","group_id":"02267cec-5558-3876-9cfc-78d056bad5b9","last_modified":"2017-03-14T17:32:24.802Z","read":false,"starred":false,"authored":false,"confirmed":"true","hidden":false,"citation_key":"Moya:AE:2002a","source_type":"article","private_publication":false,"abstract":"A size-resolved equilibrium model, SELIQUID, is\npresented and used to simulate the size-composition distribution of\nsemi-volatile inorganic aerosol in an urban environment. The model\nuses the efflorescence branch of aerosol behavior to predict the\nequilibrium partitioning of the aerosol components between the gas\nphase and a size-resolved aerosol population over the entire RH\ndomain. Predictions of SELIQUID are compared against size-resolved\ncomposition measurements at different locations during the Southern\nCalifornia Air Quality Study. Based on the modeling results, the\nsize distribution of sub-micrometer nitrate and ammonium can be\ndetermined by thermodynamic equilibrium when the RH > 60%. In\ncases where the RH < 60%, the assumption that all aerosol\nparticles are metastable liquid solutions may introduce\nunacceptable errors. On the other hand, the equilibrium assumption,\nin some cases at least, introduces errors in the calculation of the\ncoarse (particles with diameter <1 mum or so) nitrate and ammonium\nthat increase with particle size. Finally, the inclusion of crustal\nspecies is important in modeling the size distribution of coarse\ninorganic aerosols when the concentration of these species is high.\nThe effect of these crustal species can be complex and\ncounterintuitive. (C) 2002 Published by Elsevier Science Ltd.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.\nCarnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA\n15213 USA. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City, DF,\nMexico. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA\n94305 USA.","bibtype":"article","author":"Moya, M and Pandis, S N and Jacobson, M Z","journal":"Atmos. Environ.","bibtex":"@article{\n title = {Is the size distribution of urban aerosols determined by thermodynamic equilibrium? An application to Southern California},\n type = {article},\n year = {2002},\n pages = {2349-2365},\n volume = {36},\n id = {3ff86274-b21c-3a6a-98e0-fb5ab3f2972b},\n created = {2014-10-08T16:28:18.000Z},\n file_attached = {false},\n profile_id = {363623ef-1990-38f1-b354-f5cdaa6548b2},\n group_id = {02267cec-5558-3876-9cfc-78d056bad5b9},\n last_modified = {2017-03-14T17:32:24.802Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Moya:AE:2002a},\n source_type = {article},\n private_publication = {false},\n abstract = {A size-resolved equilibrium model, SELIQUID, is\npresented and used to simulate the size-composition distribution of\nsemi-volatile inorganic aerosol in an urban environment. The model\nuses the efflorescence branch of aerosol behavior to predict the\nequilibrium partitioning of the aerosol components between the gas\nphase and a size-resolved aerosol population over the entire RH\ndomain. Predictions of SELIQUID are compared against size-resolved\ncomposition measurements at different locations during the Southern\nCalifornia Air Quality Study. Based on the modeling results, the\nsize distribution of sub-micrometer nitrate and ammonium can be\ndetermined by thermodynamic equilibrium when the RH > 60%. In\ncases where the RH < 60%, the assumption that all aerosol\nparticles are metastable liquid solutions may introduce\nunacceptable errors. On the other hand, the equilibrium assumption,\nin some cases at least, introduces errors in the calculation of the\ncoarse (particles with diameter <1 mum or so) nitrate and ammonium\nthat increase with particle size. Finally, the inclusion of crustal\nspecies is important in modeling the size distribution of coarse\ninorganic aerosols when the concentration of these species is high.\nThe effect of these crustal species can be complex and\ncounterintuitive. (C) 2002 Published by Elsevier Science Ltd.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.\nCarnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA\n15213 USA. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City, DF,\nMexico. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA\n94305 USA.},\n bibtype = {article},\n author = {Moya, M and Pandis, S N and Jacobson, M Z},\n journal = {Atmos. 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