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Title: Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer

Abstract

Abstract Organic nitrates formed from nighttime reaction between anthropogenic nitrate radicals (NO3) and biogenic volatile organic compounds (BVOCs) are potentially an important but highly uncertain source of secondary organic aerosol (SOA). Here we report on the enhanced nighttime biogenic SOA formation observed in a polluted residual layer over Sacramento, California, the morning of 15 June 2010 during the Carbonaceous Aerosols and Radiative Effects Study (CARES). Trajectory analysis showed that the residual layer air, containing trace amounts of isoprene and monoterpenes left over after nighttime oxidation, was influenced by the San Francisco Bay Area emissions the previous evening. The residual layer aerosol was also enriched in nitrate, with about 64% of it estimated to be in the form of organic nitrates. The nitrate:organic mass ratio of the SOA was about 0.47±0.044, which corresponds to the range typically found in isoprene mononitrates. Assuming the SOA was composed of organic mononitrates, its nominal molecular weight was estimated at 186±11 g mol-1, consistent with the highly functionalized isoprene hydroxynitrates that have been observed in the particle phase in the southeast United States. Overall, our findings show that the efficiency of nighttime biogenic SOA formation, expressed as the change in organic aerosol mass relative tomore » carbon monoxide (?OA/?CO), was about 100 µg m-3 ppmv, which falls in the range 77-157 µg m-3 ppmv previously estimated for enhanced daytime SOA formation from mixed anthropogenic and biogenic emissions during CARES.« less

Authors:
ORCiD logo [1];  [1];  [1];  [2]
  1. BATTELLE (PACIFIC NW LAB)
  2. Brookhaven National Laboratory
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1616569
Report Number(s):
PNNL-SA-146860
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 125; Journal Issue: 6
Country of Publication:
United States
Language:
English

Citation Formats

Zaveri, Rahul A., Shilling, John E., Fast, Jerome D., and Springston, Stephen R. Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer. United States: N. p., 2020. Web. doi:10.1029/2019JD031583.
Zaveri, Rahul A., Shilling, John E., Fast, Jerome D., & Springston, Stephen R. Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer. United States. https://doi.org/10.1029/2019JD031583
Zaveri, Rahul A., Shilling, John E., Fast, Jerome D., and Springston, Stephen R. 2020. "Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer". United States. https://doi.org/10.1029/2019JD031583.
@article{osti_1616569,
title = {Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer},
author = {Zaveri, Rahul A. and Shilling, John E. and Fast, Jerome D. and Springston, Stephen R.},
abstractNote = {Abstract Organic nitrates formed from nighttime reaction between anthropogenic nitrate radicals (NO3) and biogenic volatile organic compounds (BVOCs) are potentially an important but highly uncertain source of secondary organic aerosol (SOA). Here we report on the enhanced nighttime biogenic SOA formation observed in a polluted residual layer over Sacramento, California, the morning of 15 June 2010 during the Carbonaceous Aerosols and Radiative Effects Study (CARES). Trajectory analysis showed that the residual layer air, containing trace amounts of isoprene and monoterpenes left over after nighttime oxidation, was influenced by the San Francisco Bay Area emissions the previous evening. The residual layer aerosol was also enriched in nitrate, with about 64% of it estimated to be in the form of organic nitrates. The nitrate:organic mass ratio of the SOA was about 0.47±0.044, which corresponds to the range typically found in isoprene mononitrates. Assuming the SOA was composed of organic mononitrates, its nominal molecular weight was estimated at 186±11 g mol-1, consistent with the highly functionalized isoprene hydroxynitrates that have been observed in the particle phase in the southeast United States. Overall, our findings show that the efficiency of nighttime biogenic SOA formation, expressed as the change in organic aerosol mass relative to carbon monoxide (?OA/?CO), was about 100 µg m-3 ppmv, which falls in the range 77-157 µg m-3 ppmv previously estimated for enhanced daytime SOA formation from mixed anthropogenic and biogenic emissions during CARES.},
doi = {10.1029/2019JD031583},
url = {https://www.osti.gov/biblio/1616569}, journal = {Journal of Geophysical Research: Atmospheres},
number = 6,
volume = 125,
place = {United States},
year = {Fri Mar 27 00:00:00 EDT 2020},
month = {Fri Mar 27 00:00:00 EDT 2020}
}

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