@article{
 title = {Nucleation events during the Pittsburgh Air Quality Study: Description and relation to key meteorological, gas phase, and aerosol parameters},
 type = {article},
 year = {2004},
 pages = {253-264},
 volume = {38},
 id = {0a5f3221-8b43-3a50-8645-020341be3510},
 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 = {Stanier:AST:2004b},
 source_type = {article},
 private_publication = {false},
 abstract = {During the Pittsburgh Air Quality Study (PAQS) aerosol
size distributions between 3 nm and 680 nm were measured between
July 2001 and June 2002. These distributions have been analyzed to
assess the importance of nucleation as a source of ultrafine
particles in Pittsburgh and the surrounding areas. The analysis
shows nucleation on 50% of the study days and regional-scale
formation of ultrafine particles on 30% of the days. Nucleation
occurred during all seasons, but it was most frequent in fall and
spring and least frequent in winter. Regional nucleation was most
common on sunny days with below average PM2.5 concentrations. Local
nucleation events were usually associated with elevated SO2
concentrations. The observed nucleation events ranged from weak
events with only a slight increase in the particle number to
relatively intense events with increases of total particle counts
between 50,000 cm(-3) up to 150,000 cm(-3). Averaging all days of
the study, days with nucleation events had number concentrations
peaking at around noon at about 45,000 cm(-3). This is compared to
work days without nucleation, when the daily maximum was 8 am at
23,000 cm-3, and to weekends without nucleation, when the daily
maximum was at noon at 16,000 cm(-3). Twenty-four-hour average
number concentrations were approximately 40% higher on days with
nucleation compared to those without. Nucleation was typically
observed starting around 9 am EST, although the start of nucleation
events was later in winter and earlier in summer. The nucleation
events are fairly well correlated with the product of [UV intensity
* SO2 concentration] and also depend on the effective area
available for condensation. This indicates that H2SO4 is a
component of the new particles. Published correlations for
nucleation by binary H2SO4-H2O cannot explain the observed
nucleation frequency and intensity, suggesting that an additional
component (perhaps ammonia) is participating in the particle
formation.
C1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.},
 bibtype = {article},
 author = {Stanier, C O and Khlystov, A Y and Pandis, S N},
 journal = {Aerosol Sci. Technol.}
}

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These distributions have been analyzed to\nassess the importance of nucleation as a source of ultrafine\nparticles in Pittsburgh and the surrounding areas. The analysis\nshows nucleation on 50% of the study days and regional-scale\nformation of ultrafine particles on 30% of the days. Nucleation\noccurred during all seasons, but it was most frequent in fall and\nspring and least frequent in winter. Regional nucleation was most\ncommon on sunny days with below average PM2.5 concentrations. Local\nnucleation events were usually associated with elevated SO2\nconcentrations. The observed nucleation events ranged from weak\nevents with only a slight increase in the particle number to\nrelatively intense events with increases of total particle counts\nbetween 50,000 cm(-3) up to 150,000 cm(-3). Averaging all days of\nthe study, days with nucleation events had number concentrations\npeaking at around noon at about 45,000 cm(-3). This is compared to\nwork days without nucleation, when the daily maximum was 8 am at\n23,000 cm-3, and to weekends without nucleation, when the daily\nmaximum was at noon at 16,000 cm(-3). Twenty-four-hour average\nnumber concentrations were approximately 40% higher on days with\nnucleation compared to those without. Nucleation was typically\nobserved starting around 9 am EST, although the start of nucleation\nevents was later in winter and earlier in summer. The nucleation\nevents are fairly well correlated with the product of [UV intensity\n* SO2 concentration] and also depend on the effective area\navailable for condensation. This indicates that H2SO4 is a\ncomponent of the new particles. Published correlations for\nnucleation by binary H2SO4-H2O cannot explain the observed\nnucleation frequency and intensity, suggesting that an additional\ncomponent (perhaps ammonia) is participating in the particle\nformation.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.","bibtype":"article","author":"Stanier, C O and Khlystov, A Y and Pandis, S N","journal":"Aerosol Sci. Technol.","bibtex":"@article{\n title = {Nucleation events during the Pittsburgh Air Quality Study: Description and relation to key meteorological, gas phase, and aerosol parameters},\n type = {article},\n year = {2004},\n pages = {253-264},\n volume = {38},\n id = {0a5f3221-8b43-3a50-8645-020341be3510},\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 = {Stanier:AST:2004b},\n source_type = {article},\n private_publication = {false},\n abstract = {During the Pittsburgh Air Quality Study (PAQS) aerosol\nsize distributions between 3 nm and 680 nm were measured between\nJuly 2001 and June 2002. These distributions have been analyzed to\nassess the importance of nucleation as a source of ultrafine\nparticles in Pittsburgh and the surrounding areas. The analysis\nshows nucleation on 50% of the study days and regional-scale\nformation of ultrafine particles on 30% of the days. Nucleation\noccurred during all seasons, but it was most frequent in fall and\nspring and least frequent in winter. Regional nucleation was most\ncommon on sunny days with below average PM2.5 concentrations. Local\nnucleation events were usually associated with elevated SO2\nconcentrations. The observed nucleation events ranged from weak\nevents with only a slight increase in the particle number to\nrelatively intense events with increases of total particle counts\nbetween 50,000 cm(-3) up to 150,000 cm(-3). Averaging all days of\nthe study, days with nucleation events had number concentrations\npeaking at around noon at about 45,000 cm(-3). This is compared to\nwork days without nucleation, when the daily maximum was 8 am at\n23,000 cm-3, and to weekends without nucleation, when the daily\nmaximum was at noon at 16,000 cm(-3). Twenty-four-hour average\nnumber concentrations were approximately 40% higher on days with\nnucleation compared to those without. Nucleation was typically\nobserved starting around 9 am EST, although the start of nucleation\nevents was later in winter and earlier in summer. The nucleation\nevents are fairly well correlated with the product of [UV intensity\n* SO2 concentration] and also depend on the effective area\navailable for condensation. This indicates that H2SO4 is a\ncomponent of the new particles. Published correlations for\nnucleation by binary H2SO4-H2O cannot explain the observed\nnucleation frequency and intensity, suggesting that an additional\ncomponent (perhaps ammonia) is participating in the particle\nformation.\nC1 Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.},\n bibtype = {article},\n author = {Stanier, C O and Khlystov, A Y and Pandis, S N},\n journal = {Aerosol Sci. Technol.}\n}","author_short":["Stanier, C., O.","Khlystov, A., Y.","Pandis, S., N."],"bibbaseid":"stanier-khlystov-pandis-nucleationeventsduringthepittsburghairqualitystudydescriptionandrelationtokeymeteorologicalgasphaseandaerosolparameters-2004","role":"author","urls":{},"downloads":0},"bibtype":"article","biburl":null,"creationDate":"2014-09-11T15:28:59.215Z","downloads":0,"keywords":[],"search_terms":["nucleation","events","during","pittsburgh","air","quality","study","description","relation","key","meteorological","gas","phase","aerosol","parameters","stanier","khlystov","pandis"],"title":"Nucleation events during the Pittsburgh Air Quality Study: Description and relation to key meteorological, gas phase, and aerosol parameters","year":2004}