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},
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 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 &gt; 60%. In
cases where the RH &lt; 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 &lt;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 &amp; Publ Policy, Pittsburgh, PA
15213 USA. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City, DF,
Mexico. Stanford Univ, Dept Civil &amp; 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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