Data analysis and figure making for: Multiphase and heterogeneous O3 chemistry on aerosol and infrastructural surfaces drives Cl2 sources in a coastal city
Data files
May 27, 2026 version files 40.79 KB
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OneHourData_Dryad.csv
37.81 KB
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README.md
2.98 KB
Abstract
Gas phase chlorine (Cl2) is photolyzed to form chlorine radicals (Cl•) that impact atmospheric oxidation chemistry, enhancing ozone (O3) and particulate matter. Some coastal regions demonstrate increase in Cl2 with enhanced local particulate nitrate, but generally, Cl2 formation is poorly studied globally. We measured Cl2 mixing ratios and fluxes in the greater New York City region in the summer of 2023. Cl2 mixing ratios and fluxes reached maximum hourly averages (± standard deviation) of 24±10 ppt and 170±100 ppt∙cm∙s-1, respectively, at midday. Cl2 mixing ratios correlate with solar radiation, hypochlorous acid (HOCl) and O3, suggesting multiphase photchemistry as a dominant source of Cl2 in the region. Further, positive fluxes demonstrate emission of Cl2 from within a couple miles of the field site. We hypothesize that infrastructural surfaces provide additional surface area and are a potential source of Cl-, enabling gas-phase Cl2 formation from these surfaces in addition to previously observed Cl2 formation from aerosol surfaces.
Data herein was collected during the Fluxes of Reactive Organic Gases (FROG-NY) campaign in Mineola, New York in the summer of 2023. Cl2, ClNO2, NCl3, and HOCl mixing ratios were measured using an Iodide Chemical Ionization Mass Spectrometer (I-CIMS) and Cl2 Flux is a product of eddy covariance flux analysis using the measured Cl2 mixing ratios and their covariance with wind speed. All I-CIMS data was originally collected at 5Hz and averaged to 1hr data for all subsequent analysis (except for Eddy Covariance, for which Cl2 data was kept at 5Hz). Data analysis and figure making for: Multiphase and heterogeneous O3 chemistry on aerosol and infrastructural surfaces drives Cl2 sources in a coastal city
Files and variables
File: OneHourData_Dryad.csv
Description:
Variables
- Date and Time (EDT)
- Cl2_33m: Cl2 mixing ratio in ppt, at 33 meter measurement height
- Cl2 Flux_33m: Cl2 flux in ppt x cm x s-1
- ClNO2_33m: ClNO2 signal in normalized counts per second (ncps), at 33 meter measurement height
- NCl3_33m: NCl3 signal in normalized counts per second (ncps), at 33 meter measurement height
- HOCl_33m: HOCl mixing ratio in ppt, at 33 meter measurement height
- NOTE: all -99999 values are Nan. Missing data points for were times when the ICIMS instrument was either not operating or offline for calibrations.
Works with reference to this data set:
Richard, K.L.; Veremeuel, M.V.; Franklin, E.; Rossell, R.K.; De Groodt, A.; Maddaleno, T.A.; Hallward-Driemeier, A.; Zhao, Y.; Rogers, M.J.; Gentner, D.R.; O'Brien, R.; Commane, R.; Millet, D.B.; Farmer, D.K.; (submitted). Multiphase and heterogeneous O3 chemistry on aerosol and infrastructural surfaces drives Cl2 sources in a coastal city. AGU Journal of Geophysical Research.
Supplemental Data Publicly Available at:
Access information
Other publicly accessible data associated with the manuscript "Multiphase and heterogeneous O3 chemistry on aerosol and infrastructural surfaces drives Cl2 sources in a coastal city" is located elsewhere and will not be further discussed here.
- FROG-NY 2023 dataset including ACSM, PTR, O3, NOx and meteorological data publicly available on AEROMMA website (https://csl.noaa.gov/projects/aeromma/data.html)
- Flux toolbox was used for all eddy covariance flux analysis and is publicly available (https://github.com/AirChem/FluxToolbox)