Estimating N2O5 uptake coefficients using ambient measurements of NO3, N2O5, ClNO2 and particle-phase nitrate

G. J. Phillips, J. Thieser, M. J. Tang, N. Sobanski, G. Schuster, J. Fachinger, F. Drewnick, S. Borrmann, H. Bingemer, J. Lelieveld, J. N. Crowley
2016 Atmospheric Chemistry and Physics Discussions  
We present an estimation of the uptake coefficient (&gamma;) and yield of nitryl chloride (ClNO<sub>2</sub>) (<i>f</i>) for the heterogeneous processing of dinitrogen pentoxide (N<sub>2</sub>O<sub>5</sub>) using simultaneous measurements of particle and trace gas composition at a semi-rural, non-coastal, mountain site in the summer of 2011. The yield of ClNO<sub>2</sub> varied between (0.035&thinsp;&plusmn;&thinsp;0.027) and (1.38&thinsp;&plusmn;&thinsp;0.60) with a campaign average of
more » ... nsp;&plusmn;&thinsp;0.35). The large variability in <i>f</i> reflects the highly variable chloride content of particles at the site. Uptake coefficients were also highly variable with minimum, maximum and average &gamma; values of 0.004, 0.11 and 0.028&thinsp;&plusmn;&thinsp;0.029, respectively, with no significant correlation with particle composition, but a weak dependence on relative humidity. The uptake coefficients obtained are compared to existing parameterisations based on laboratory datasets and with other values obtained by analysis of field data.
doi:10.5194/acp-2016-693 fatcat:pgu3h3miifd2dky5st7ktin4ii