Department of Earth System Science
Measurement of Cl
in coastal urban air
- Author(s): Finley, B. D
- Saltzman, E. S
- et al.
Published Web Locationhttps://doi.org/10.1029/2006GL025799
Measurements of Cl2 in coastal urban air were made in Irvine, California from Aug.-Nov., 2005, using negative ion atmospheric pressure chemical ionization with tandem mass spectrometry. Cl2 ranged from <2.5 to 20 ppt with a two month mean of 3.5 ± 3.5 ppt (1σ) and an average noon photolysis rate of 44 ppt hr−1 Cl2. Model calculations suggest that Cl2 photochemistry results in an increase of 5–8 ppb in daily maximum O3 levels, relative to a base case scenario without Cl2.