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Measurement of Cl 2 in coastal urban air
Author(s) -
Finley B. D.,
Saltzman E. S.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl025799
Subject(s) - noon , environmental science , air mass (solar energy) , atmospheric sciences , photodissociation , atmospheric pressure , ion , analytical chemistry (journal) , environmental chemistry , chemistry , meteorology , physics , photochemistry , boundary layer , thermodynamics , organic chemistry
Measurements of Cl 2 in coastal urban air were made in Irvine, California from Aug.‐Nov., 2005, using negative ion atmospheric pressure chemical ionization with tandem mass spectrometry. Cl 2 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 Cl 2 . Model calculations suggest that Cl 2 photochemistry results in an increase of 5–8 ppb in daily maximum O 3 levels, relative to a base case scenario without Cl 2 .