The first UK measurements of nitryl chloride using a chemical ionization mass spectrometer in central London in the summer of 2012, and an investigation of the role of Cl atom oxidation

Bannan, Thomas J.; Booth, A. Murray; Bacak, Asan; Muller, Jennifer B. A.; Leather, Kimberley E.; Le Breton, Michael; Jones, Benjamin; Young, Dominique; Coe, Hugh; Allan, James; Visser, Suzanne; Slowik, Jay G.; Furger, Markus; Prevot, Andre S. H.; Lee, James; et. al.


The first nitryl chloride (ClNO2) measurements in the UK were made during the summer 2012 ClearfLo campaign with a chemical ionization mass spectrometer, utilizing an I- ionization scheme. Concentrations of ClNO2 exceeded detectable limits (11ppt) every night with a maximum concentration of 724ppt. A diurnal profile of ClNO2 peaking between 4 and 5 A.M., decreasing directly after sunrise, was observed. Concentrations of ClNO2 above the detection limit are generally observed between 8 P.M. and 11 A.M. Different ratios of the production of ClNO2:N2O5 were observed throughout with both positive and negative correlations between the two species being reported. The photolysis of ClNO2 and a box model utilizing the Master Chemical Mechanism modified to include chlorine chemistry was used to calculate Cl atom concentrations. Simultaneous measurements of hydroxyl radicals (OH) using low pressure laser-induced fluorescence and ozone enabled the relative importance of the oxidation of three groups of measured VOCs (alkanes, alkenes, and alkynes) by OH radicals, Cl atoms, and O-3 to be compared. For the day with the maximum calculated Cl atom concentration, Cl atoms in the early morning were the dominant oxidant for alkanes and, over the entire day, contributed 15%, 3%, and 26% toward the oxidation of alkanes, alkenes, and alkynes, respectively.

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Título según WOS: ID WOS:000356975700021 Not found in local WOS DB
Volumen: 120
Número: 11
Fecha de publicación: 2015
Página de inicio: 5638
Página final: 5657


Notas: ISI