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Title: Effect of oxidant concentration, exposure time, and seed particles on secondary organic aerosol chemical composition and yield

Abstract

We performed a systematic intercomparison study of the chemistry and yields of secondary organic aerosol (SOA) generated from OH oxidation of a common set of gas-phase precursors in a Potential Aerosol Mass (PAM) continuous flow reactor and several environmental chambers. In the flow reactor, SOA precursors were oxidized using OH concentrations ranging from 2.0 × 108 to 2.2 × 1010 molec cm-3 over exposure times of 100 s. In the environmental chambers, precursors were oxidized using OH concentrations ranging from 2 × 106 to 2 × 107 molec cm-3 over exposure times of several hours. The OH concentration in the chamber experiments is close to that found in the atmosphere, but the integrated OH exposure in the flow reactor can simulate atmospheric exposure times of multiple days compared to chamber exposure times of only a day or so. In most cases, for a specific SOA type the most-oxidized chamber SOA and the least-oxidized flow reactor SOA have similar mass spectra, oxygen-to-carbon and hydrogen-to-carbon ratios, and carbon oxidation states at integrated OH exposures between approximately 1 × 1011 and 2 × 1011 molec cm-3 s, or about 1–2 days of equivalent atmospheric oxidation. This observation suggests that in the range ofmore » available OH exposure overlap for the flow reactor and chambers, SOA elemental composition as measured by an aerosol mass spectrometer is similar whether the precursor is exposed to low OH concentrations over long exposure times or high OH concentrations over short exposure times. This similarity in turn suggests that both in the flow reactor and in chambers, SOA chemical composition at low OH exposure is governed primarily by gas-phase OH oxidation of the precursors rather than heterogeneous oxidation of the condensed particles. In general, SOA yields measured in the flow reactor are lower than measured in chambers for the range of equivalent OH exposures that can be measured in both the flow reactor and chambers. The influence of sulfate seed particles on isoprene SOA yield measurements was examined in the flow reactor. The studies show that seed particles increase the yield of SOA produced in flow reactors by a factor of 3 to 5 and may also account in part for higher SOA yields obtained in the chambers, where seed particles are routinely used.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [4];  [5];  [5];  [5];  [2];  [2];  [5]
+ Show Author Affiliations
  1. Boston College, Chestnut Hill, MA (United States); Aerodyne Research Inc., Billerica, MA (United States)
  2. Aerodyne Research Inc., Billerica, MA (United States)
  3. Pennsylvania State Univ., State College, PA (United States)
  4. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
  5. Boston College, Chestnut Hill, MA (United States)
Publication Date:
Research Org.:
Boston College, Chestnut Hill, MA (United States); Aerodyne Research Inc., Billerica, MA (United States); Pennsylvania State Univ., University Park, PA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF). Atmospheric Chemistry Program
OSTI Identifier:
1198408
Alternate Identifier(s):
OSTI ID: 1454913
Grant/Contract Number:  
SC0006980; SC0011935; FG02-05ER63995; AGS-1244918; ATM-0854916; AGS-1244999; AGS-0904292; AGS-1244995; AGS-1056225; AGS-1245011
Resource Type:
Published Article
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 15 Journal Issue: 6; Journal ID: ISSN 1680-7324
Publisher:
Copernicus Publications, EGU
Country of Publication:
Germany
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES

Citation Formats

Lambe, A. T., Chhabra, P. S., Onasch, T. B., Brune, W. H., Hunter, J. F., Kroll, J. H., Cummings, M. J., Brogan, J. F., Parmar, Y., Worsnop, D. R., Kolb, C. E., and Davidovits, P. Effect of oxidant concentration, exposure time, and seed particles on secondary organic aerosol chemical composition and yield. Germany: N. p., 2015. Web. doi:10.5194/acp-15-3063-2015.
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Lambe, A. T., Chhabra, P. S., Onasch, T. B., Brune, W. H., Hunter, J. F., Kroll, J. H., Cummings, M. J., Brogan, J. F., Parmar, Y., Worsnop, D. R., Kolb, C. E., & Davidovits, P. Effect of oxidant concentration, exposure time, and seed particles on secondary organic aerosol chemical composition and yield. Germany. https://doi.org/10.5194/acp-15-3063-2015
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Lambe, A. T., Chhabra, P. S., Onasch, T. B., Brune, W. H., Hunter, J. F., Kroll, J. H., Cummings, M. J., Brogan, J. F., Parmar, Y., Worsnop, D. R., Kolb, C. E., and Davidovits, P. Wed . "Effect of oxidant concentration, exposure time, and seed particles on secondary organic aerosol chemical composition and yield". Germany. https://doi.org/10.5194/acp-15-3063-2015.
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@article{osti_1198408,
title = {Effect of oxidant concentration, exposure time, and seed particles on secondary organic aerosol chemical composition and yield},
author = {Lambe, A. T. and Chhabra, P. S. and Onasch, T. B. and Brune, W. H. and Hunter, J. F. and Kroll, J. H. and Cummings, M. J. and Brogan, J. F. and Parmar, Y. and Worsnop, D. R. and Kolb, C. E. and Davidovits, P.},
abstractNote = {We performed a systematic intercomparison study of the chemistry and yields of secondary organic aerosol (SOA) generated from OH oxidation of a common set of gas-phase precursors in a Potential Aerosol Mass (PAM) continuous flow reactor and several environmental chambers. In the flow reactor, SOA precursors were oxidized using OH concentrations ranging from 2.0 × 108 to 2.2 × 1010 molec cm-3 over exposure times of 100 s. In the environmental chambers, precursors were oxidized using OH concentrations ranging from 2 × 106 to 2 × 107 molec cm-3 over exposure times of several hours. The OH concentration in the chamber experiments is close to that found in the atmosphere, but the integrated OH exposure in the flow reactor can simulate atmospheric exposure times of multiple days compared to chamber exposure times of only a day or so. In most cases, for a specific SOA type the most-oxidized chamber SOA and the least-oxidized flow reactor SOA have similar mass spectra, oxygen-to-carbon and hydrogen-to-carbon ratios, and carbon oxidation states at integrated OH exposures between approximately 1 × 1011 and 2 × 1011 molec cm-3 s, or about 1–2 days of equivalent atmospheric oxidation. This observation suggests that in the range of available OH exposure overlap for the flow reactor and chambers, SOA elemental composition as measured by an aerosol mass spectrometer is similar whether the precursor is exposed to low OH concentrations over long exposure times or high OH concentrations over short exposure times. This similarity in turn suggests that both in the flow reactor and in chambers, SOA chemical composition at low OH exposure is governed primarily by gas-phase OH oxidation of the precursors rather than heterogeneous oxidation of the condensed particles. In general, SOA yields measured in the flow reactor are lower than measured in chambers for the range of equivalent OH exposures that can be measured in both the flow reactor and chambers. The influence of sulfate seed particles on isoprene SOA yield measurements was examined in the flow reactor. The studies show that seed particles increase the yield of SOA produced in flow reactors by a factor of 3 to 5 and may also account in part for higher SOA yields obtained in the chambers, where seed particles are routinely used.},
doi = {10.5194/acp-15-3063-2015},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 6,
volume = 15,
place = {Germany},
year = {Wed Mar 18 00:00:00 EDT 2015},
month = {Wed Mar 18 00:00:00 EDT 2015}
}
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