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BEGIN:VEVENT
SUMMARY:Aerosol Uptake of HO2 as a Limiting Factor in Ozone Pollution
LOCATION:Virtual Seminar
TZID:America/Denver
DTSTART:20200101T000000
UID:2026-04-23-05-56-39@natsci.colostate.edu
DTSTAMP:20260423T055639
Description:Literature Seminar\n\nOzone is a key air pollutant that impacts
  human and ecosystem health\, and acts as a short-lived climate forcer. De
 spite being the focus of many decades or research\, atmospheric ozone tren
 ds in urban areas can still be difficult to predict. Based on previous lab
 oratory and modeling studies\,1\,2 heterogeneous uptake of atmospheric HO2
  on to particles is a potential mechanism for enhancing ozone pollution in
  the face of reduced anthropogenic emissions.  However\, due to the analy
 tical challenges in measuring ambient uptake coefficients\, a detailed und
 erstanding of aerosol influences on ozone is not currently available and r
 elies on alternative methods\, including budget analyses and air pollution
  trend analysis.  A recent study from Tan et al. (2020)\,3 utilizing budg
 et analysis of HO2 and other ozone precursors in Wangdu\, China found that
  reactive uptake on aerosols was not an important ozone limiting factor. T
 his model-measurement discrepancy reinforces the need for a more comprehen
 sive understanding of the relationships between ozone and particulate matt
 er.  The recent and drastic reductions in emissions and overall pollution
  during COVID-19 related lockdown periods could serve as an opportunity to
  evaluate the global relationship between particulate matter and ozone.\n\
 n&nbsp\;\n\nReferences\n\n[1] Taketani\, F.\; Kanaya\, Y.\; Pochanart\, P.
 \; Liu\, Y.\; Li\, J.\; Okuzawa\, K.\; Kawamura\, K.\; Wang\, Z.\; Akimoto
 \, H. Measurement of overall uptake coefficients for HO2 radicals by aeros
 ol particles sampled from ambient air at Mts. Tai and Mang (China). Atmos.
  Chem. Phys. 2012\, 12\, 11907-11916.\n\n[2] Li\, K.\; Jacob\, D. J.\; Lia
 o\, H.\; Shen\, Lu.\; Zhang\, Q.\; Bates\, K. H. Anthropogenic drivers of 
 2013-2017 trends in summer surface ozone in China. PNAS 2019\, 116\, 422-4
 27.\n\n[3] Tan\, Z.\; Hofzumahaus\, A.\; Lu\, K.\; Brown\, S. S.\; Holland
 \, F.\; Huey\, G. L.\; Kiendler-Scharr\, A.\; Li\, X.\; Liu\, X.\; Ma\, N.
 \; Min\, K.-E.\; Rohrer\, F.\; Shao\, M.\; Wahner\, A.\; Wang\, Y.\; Wiede
 nsohler\, A.\; Wu\, Y.\; Wu\, Z.\; Zeng\, L.\; Zhang\, Y.\; Fuchs\, H. No 
 evidence for a significant impact of heterogeneous chemistry on radical co
 ncentrations in the North China Plain in Summer 2014. Environ. Sci. Tech. 
 2020\, 54\, 5973-5979. 4:00 pm
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