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Journal article
Characterization of ozone production in San Antonio, Texas, using measurements of total peroxy radicals
Atmospheric chemistry and physics, v 19(5), pp 2845-2860
04 Mar 2019
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Observations of total peroxy radical concentrations ([XO2] [RO2] + [HO2]) made by the Ethane CHemical AMPlifier (ECHAMP) and concomitant observations of additional trace gases made on board the Aerodyne Mobile Laboratory (AML) during May 2017 were used to characterize ozone production at three sites in the San Antonio, Texas, region. Median daytime [O-3] was 48 ppbv at the site downwind of central San Antonio. Higher concentrations of NO and XO2 at the downwind site also led to median daytime ozone production rates (P(O-3)) of 4.2 ppbv h(-1), a factor of 2 higher than at the two upwind sites. The 95th percentile of P(O-3) at the upwind site was 15.1 ppbv h(-1), significantly lower than values observed in Houston. In situ observations, as well as satellite retrievals of HCHO and NO2, suggest that the region was predominantly NOx-limited. Only approximately 20% of observations were in the VOC-limited regime, predominantly before 11:00 EST, when ozone production was low. Biogenic volatile organic compounds (VOCs) comprised 55% of total OH reactivity at the downwind site, with alkanes and non-biogenic alkenes responsible for less than 10% of total OH reactivity in the afternoon, when ozone production was highest. To control ozone formation rates at the three study sites effectively, policy efforts should be directed at reducing NOx emissions. Observations in the urban center of San Antonio are needed to determine whether this policy is true for the entire region.
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Details
- Title
- Characterization of ozone production in San Antonio, Texas, using measurements of total peroxy radicals
- Creators
- Daniel C. Anderson - Drexel UniversityJessica Payelec - Drexel Univ, Dept Chem, Philadelphia, PA 19104 USAConner Daube - Aerodyne ResearchScott C. Herndon - Aerodyne ResearchWalter B. Knighton - Montana State UniversityBrian M. Lerner - Aerodyne ResearchJ. Robert Roscioli - Aerodyne ResearchTara Yacovitch - Aerodyne ResearchEzra C. Wood - Drexel University
- Publication Details
- Atmospheric chemistry and physics, v 19(5), pp 2845-2860
- Publisher
- Copernicus Gesellschaft Mbh
- Number of pages
- 16
- Grant note
- AGS-1443842; AGS-1719918 / NSF; National Science Foundation (NSF) 17-032 / Texas Air Quality Research Program (AQRP) at the University of Texas Austin through the Texas Emission Reduction Program (TERP) Texas Commission on Environmental Quality (TCEQ)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000460204600007
- Scopus ID
- 2-s2.0-85062563793
- Other Identifier
- 991019182766704721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Web of Science research areas
- Environmental Sciences
- Meteorology & Atmospheric Sciences