Grantee Research Project Results
Final Report: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Oregon Health and Science Report
EPA Grant Number: R826371C008Subproject: this is subproject number 008 , established and managed by the Center Director under grant R826371
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States
Center Director: Seinfeld, John
Title: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Oregon Health and Science Report
Investigators: Pankow, James F.
Institution: Oregon Graduate Institute of Science & Technology
EPA Project Officer: Hahn, Intaek
Project Period: April 15, 1998 through April 14, 2003
RFA: Special Opportunity in Tropospheric Ozone (1997) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Air
Objective:
The main objective of this research project was to construct and test a modeling framework that can predict the formation of particulate matter (PM) as it occurs by the condensation of products formed in the atmosphere by the oxidation of volatile parent hydrocarbons. This work was conducted in collaboration with the Seinfeld group.
Summary/Accomplishments (Outputs/Outcomes):
The Pankow group tested, for the first time, the ability of a secondary organic aerosol (SOA) formation model to simulate aerosol yield data from chamber experiments involving the ozone oxidation parent volatile organic compounds (VOCs). The VOCs examined included four monoterpenes (-pinene, -pinene, sabinene, 3-carene) and cyclohexene. Figure 1 contains example modeling results for a chamber experiment involving the O3-oxidation of a low concentration of gaseous -pinene. Of special interest in that table is the column labeled Ryi, which is the predicted-to-measured ratio of the compound-dependent aerosol yield values Yi. Most of the Ryi values are in the range of 1 to 3, indicating yield prediction to within a factor of three.
Table 1. Table of Measured and Predicted Aerosol Product Yields in the β-Pinene/03 System (Dry Conditions)
aerosol yield Υi x 100 (%) | predicted/mesured | ||||||
---|---|---|---|---|---|---|---|
exp 6/11/98b | exp 6/11/98b | results for two expts | |||||
Product | ΡLa (Torr)3 | αb | measdc | pred | RY | av, RY | SD, σRy |
hudroxy pina ketones | 1.09 x 10-1 | 0.0923 | 0.74 | 0.0005 | 0.0001 | 0.0003 | 0.00 |
norpinonic acid and isomers | 8.17 x 10-6 | 0.1400 | 1.7 | 4.9 | 2.88 | 1.62 | 1.78 |
norpinic acid | 7.50 x 10-6 | 0.0039 | 0.17 | 0.15 | 0.89 | 0.57 | 0.44 |
hydoxy norpinonic acid | 6.93 x 10-6 | 0.0129 | 0.14 | 0.48 | 3.40 | 1.84 | 2.21 |
pinonic acid | 2.22 x 10-6 | 0.0085 | 0.14 | 0.56 | 4.00 | 2.36 | 2.32 |
pinic acid | 2.10 x 10-6 | 0.0431 | 1.2 | 3.0 | 2.49 | 1.57 | 1.31 |
Hydroxy pinonic acid | 2.03 x 10-6 | 0.0054 | 0.25 | 0.37 | 1.47 | 1.03 | 0.63 |
X (total unidentified mass)d | 1.00 x 10-12 | 0.0099 | 0.15 | 0.15 | 1.00 | 1.00 | 0.00 |
total yeild, γ x 100% | 4.5 | 9.6 | |||||
Mo (µg m-3 | 18.9 | 40.4 | |||||
Ry = 2.13 (6/11/98b), Ry = 1.33, σRy = 1.14 |
a Predicted by UNIFAC vapor pressure at 308 K. b Arethmetric average of measured α values calculated for the two experiments. c Measured
values are from Yu et. al. (43). d Product X represents the total amount of unidentified aerosol mass, including the product identified as
3-oxopinaketone by Yy et. al. (34). Product X was assumed to consist of a compound with 2 CH3, 2 CH2, 2 CH, 1 C, 1 CH3CO, and 1 COOH
UNIFAC functional groups. MWx = 184 g moi-1. An α value for product X was calculated individually for each experiment. The vapor pressure
of X is such t hat essentially all the avilable mass will partition in to the aeorsol phase.
We examined the extent to which the SOA PM that the Pankow group considered has the capacity to absorb water, as driven by increases in the relative humidity (RH). Figure 2 presents the model results for the uptake of water by aerosol PM in the cyclohexene-O3 system. This is the first study to make specific RH-dependent predictions of this type for SOA PM.
Supplemental Keywords:
air quality modeling, ambient air, particulate, ozone, environmental chemistry, California, CA, Northeastern United States., RFA, Scientific Discipline, Air, particulate matter, Environmental Chemistry, Analytical Chemistry, tropospheric ozone, Atmospheric Sciences, aerosol formation, atmospheric particulate matter, fine particles, airborne particulate matter, fine particulates, ozone, air sampling, air pollution models, air quality model, chemical composition, atmospheric aerosol particles, hydrocarbons, aersol particles, California, atmospheric chemistry, ambient aerosol particlesProgress and Final Reports:
Original AbstractMain Center Abstract and Reports:
R826371 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R826371C001 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech, UC-Riverside, UC-San Diego, UC-Davis Report
R826371C002 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech, Carnegie Mellon, Georgia Institute, NJIT, Oregon Institute, UC-Irvine, UC-Riverside Report
R826371C003 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech Report
R826371C004 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: California - Irvine Report
R826371C005 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Carnegie Mellon Report
R826371C006 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Carnegie Mellon Report
R826371C007 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: UC-Riverside
R826371C008 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Oregon Health and Science Report
R826371C009 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: NJIT Report
The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.