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Exploring Key Topics in Photochemistry: Manuscript Ideas from the Working Group

The Photochemistry Working Group has identified and grouped several manuscript ideas into four main topics: Fundamental Photochemistry, Convection and UT Photochemistry, Photochemical Evolution, and Regional Budgets of Ozone and Reactive Nitrogen. The contributions and primary responsibilities for each topic have been outlined, highlighting current research diagnostics and data integration strategies. Notably, efforts to utilize non-DC-8 datasets are emphasized to enhance photochemical analyses. This overview serves to guide future research directions and collaboration in the field.

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Exploring Key Topics in Photochemistry: Manuscript Ideas from the Working Group

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  1. Photochemistry and Models Working Group Potential manuscripts ideas were identified Ideas then grouped topically Four broad topics identified: Fundamental photochemistry Convection and UT photochemistry Photochemical evolution Regional budgets of ozone and reactive nitrogen Primary responsibility (contributors) identified and listed Supporting ideas/possible papers are indented There is currently no clear strategy for exploiting non DC-8 data sets Useful research diagnostics were identified and responsibility assigned for their archival or inclusion in the merged data sets

  2. Fundamental Photochemistry (11): Fried (Heikes, Crawford)-Formaldehyde distributions during INTEX Fried-Unexpected formaldehyde abundance in marine BL Brune (Crawford)-Oxidation chemistry and oxidant levels in INTEX vs previous campaigns Brune-Use of higher resolution obs to assess impact on oxidation Brune (Cohen)-Vertical distribution of ozone production in the BL Crawford-NMHCs impacts on photochemistry Wingenter (Crawford)-Iodine sources and photochemistry in the marine BL Lefer (Carmichael,Crawford)-Impact of clouds and aerosols on photochemistry Cohen (Dibb, Wennberg)-Isoprene nitrate yields & BL chemistry Wennberg/Crounse-High resolution H2O2 obs in clouds Cohen-Reactive nitrogen balance and budget *Huey (Cohen,Brune)-Pernitric acid during INTEX *Wennberg/Crounse (Heikes, Jaegle, Crawford)-Peroxyacetic acid during *Fast-track request Currently unaddressed: Acetaldehyde

  3. Convection and UT photochemistry (3) (Mailing List suggested): Qinbin-INTEX data and consistency with GEOS-Chem UT O3 (Crawford, Browell, Clarke, Cohen, Anderson, Wingenter, O’Sullivan, Blake, Carmichael, Chatfield, Pierce, Hudman)-convection and photochemical clocks (complications from mixing) Fried-Formaldehyde in UT (convective contributions) Heikes (Carmichael, Crounse, Fried, Dibb, Weber)-Effects of precipitation and physical removal on photochemically generated species Photochemical Evolution (4): G. Pfister/Chatfield-Photochemical evolution of biomass burning plumes Cohen (Brune, Huey, Crawford, Wingenter)-DC-8 near-field lagrangian opportunities and chemical evolution Millet (Fried)-Formaldeyde, acetone and methanol during INTEX and implications for satellite obs Hudman-Cross-Atlantic Lagrangian chemical evolution

  4. Regional budgets of ozone and reactive nitrogen (9): Crawford-Ozone budgets across air mass types Pierce (Cohen, Avery, Dibb)-Regional O3/NOy budgets during INTEX Pierce (Cohen, Avery, Dibb)-Large-scale Lagrangian source-receptor Hudman (Cohen)-Reactive nitrogen budgets and export efficiency Carmichael-Regional photochemistry and the impact of reanalysis Carmichael (Crawford, Lefer, Hudman)-Constrained eulerian and 0-D modelling differences Carmichael-Predictability of ozone and SOA (improvements from INTEX?) Carmichael-Impact of lateral boundary conditions on regional ozone Jaegle-Asian influence on ozone and reactive nitrogen over N. America Chatfield-Pollution aging during INTEX, comparison with CMAQ Still lack clear strategies for integrating other data sets with the DC-8 to broaden photochemical analyses: AIRMAP AIRNOW (speciated PM2.5) IONS NOAA P-3

  5. Research tools for inclusion in the data merges: Biomass Plume Encounter Index (a challenge to the BB plume group) Planetary Boundary Layer Index (Pierce, Crawford, Fuelberg) Cloud Impact Factor (Lefer) Time from convection and lightning intensity (Porter/Fuelberg) Mixing diagnostic (Brad Pierce) Distance/Time downwind of cirrus encounters (Westberg?) Other tools: Biomass Burning emission grid and index (Turquety) Model Curtains and products along flight tracks (should also produce for P-3B) Cloud Impact Factors along trajectories (Carmichael, Lefer)

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