@article{
 title = {Water absorption by secondary organic aerosol and its effect an inorganic aerosol behavior},
 type = {article},
 year = {2000},
 identifiers = {[object Object]},
 pages = {71-77},
 volume = {34},
 id = {e29dbe65-24a7-30d8-bcd8-d9a9bff5e264},
 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 = {Ansari:EST:2000a},
 source_type = {article},
 private_publication = {false},
 abstract = {The hygroscopic nature of atmospheric aerosol has
generally been associated with its inorganic fraction. In this
study, a group contribution method is used to predict the water
absorption of secondary organic aerosol (SOA). Compared against
growth measurements of mixed inorganic-organic particles, this
method appears to provide a first-order approximation in predicting
SOA water absorption. The growth of common SOA species is predicted
to be significantly less than common atmospheric inorganic salts
such as (NH4)(2)SO4 and NaCl. Using this group contribution method
as a tool in predicting SOA water absorption, an integrated
modeling approach is developed combining available SOA and
inorganic aerosol models to predict overall aerosol behavior. The
effect of SOA on water absorption and nitrate partitioning between
the gas and aerosol phases is determined. On average, it appears
that SOA accounts for approximately 7% of total aerosol water and
increases aerosol nitrate concentrations by approximately 10%. At
high relative humidity (greater than or equal to 85%) and low SOA
mass fractions (<20% of total PM2.5), the role of SOA in nitrate
partitioning and its contribution to total aerosol water is
negligible. However, the water absorption of SOA appears to be less
sensitive to changes in relative humidity than that of inorganic
species, and thus at low relative humidity (similar to 50%) and
high SOA mass fraction concentrations (similar to 30% of total
PM2.5), SOA is predicted to account for approximately 20% of total
aerosol water and a 50% increase in aerosol nitrate
concentrations. These findings could improve the results of
modeling studies where aerosol nitrate has often been
underpredicted.
C1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA
15213 USA.},
 bibtype = {article},
 author = {Ansari, A S and Pandis, S N},
 journal = {Environ. Sci. Technol.}
}

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In this\nstudy, a group contribution method is used to predict the water\nabsorption of secondary organic aerosol (SOA). Compared against\ngrowth measurements of mixed inorganic-organic particles, this\nmethod appears to provide a first-order approximation in predicting\nSOA water absorption. The growth of common SOA species is predicted\nto be significantly less than common atmospheric inorganic salts\nsuch as (NH4)(2)SO4 and NaCl. Using this group contribution method\nas a tool in predicting SOA water absorption, an integrated\nmodeling approach is developed combining available SOA and\ninorganic aerosol models to predict overall aerosol behavior. The\neffect of SOA on water absorption and nitrate partitioning between\nthe gas and aerosol phases is determined. On average, it appears\nthat SOA accounts for approximately 7% of total aerosol water and\nincreases aerosol nitrate concentrations by approximately 10%. At\nhigh relative humidity (greater than or equal to 85%) and low SOA\nmass fractions (<20% of total PM2.5), the role of SOA in nitrate\npartitioning and its contribution to total aerosol water is\nnegligible. However, the water absorption of SOA appears to be less\nsensitive to changes in relative humidity than that of inorganic\nspecies, and thus at low relative humidity (similar to 50%) and\nhigh SOA mass fraction concentrations (similar to 30% of total\nPM2.5), SOA is predicted to account for approximately 20% of total\naerosol water and a 50% increase in aerosol nitrate\nconcentrations. These findings could improve the results of\nmodeling studies where aerosol nitrate has often been\nunderpredicted.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.\nCarnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA\n15213 USA.","bibtype":"article","author":"Ansari, A S and Pandis, S N","journal":"Environ. Sci. Technol.","bibtex":"@article{\n title = {Water absorption by secondary organic aerosol and its effect an inorganic aerosol behavior},\n type = {article},\n year = {2000},\n identifiers = {[object Object]},\n pages = {71-77},\n volume = {34},\n id = {e29dbe65-24a7-30d8-bcd8-d9a9bff5e264},\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 = {Ansari:EST:2000a},\n source_type = {article},\n private_publication = {false},\n abstract = {The hygroscopic nature of atmospheric aerosol has\ngenerally been associated with its inorganic fraction. In this\nstudy, a group contribution method is used to predict the water\nabsorption of secondary organic aerosol (SOA). Compared against\ngrowth measurements of mixed inorganic-organic particles, this\nmethod appears to provide a first-order approximation in predicting\nSOA water absorption. The growth of common SOA species is predicted\nto be significantly less than common atmospheric inorganic salts\nsuch as (NH4)(2)SO4 and NaCl. Using this group contribution method\nas a tool in predicting SOA water absorption, an integrated\nmodeling approach is developed combining available SOA and\ninorganic aerosol models to predict overall aerosol behavior. The\neffect of SOA on water absorption and nitrate partitioning between\nthe gas and aerosol phases is determined. On average, it appears\nthat SOA accounts for approximately 7% of total aerosol water and\nincreases aerosol nitrate concentrations by approximately 10%. At\nhigh relative humidity (greater than or equal to 85%) and low SOA\nmass fractions (<20% of total PM2.5), the role of SOA in nitrate\npartitioning and its contribution to total aerosol water is\nnegligible. However, the water absorption of SOA appears to be less\nsensitive to changes in relative humidity than that of inorganic\nspecies, and thus at low relative humidity (similar to 50%) and\nhigh SOA mass fraction concentrations (similar to 30% of total\nPM2.5), SOA is predicted to account for approximately 20% of total\naerosol water and a 50% increase in aerosol nitrate\nconcentrations. These findings could improve the results of\nmodeling studies where aerosol nitrate has often been\nunderpredicted.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.\nCarnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA\n15213 USA.},\n bibtype = {article},\n author = {Ansari, A S and Pandis, S N},\n journal = {Environ. Sci. Technol.}\n}","author_short":["Ansari, A., S.","Pandis, S., N."],"bibbaseid":"ansari-pandis-waterabsorptionbysecondaryorganicaerosolanditseffectaninorganicaerosolbehavior-2000","role":"author","urls":{},"downloads":0},"bibtype":"article","biburl":null,"creationDate":"2014-09-11T15:28:59.224Z","downloads":0,"keywords":[],"search_terms":["water","absorption","secondary","organic","aerosol","effect","inorganic","aerosol","behavior","ansari","pandis"],"title":"Water absorption by secondary organic aerosol and its effect an inorganic aerosol behavior","year":2000}