Options
1991
Conference Paper
Titel
An estimation of the source strength of atomic CI from aerosol smog chamber experiments on the reaction of N2O5 with NaCl at various humidities
Abstract
The reaction of N2O5 with wet NaCl aerosol is observed to produce ClNo2 at high yields. The sticking coefficient of N2O5 on NaCl aerosol is determined in a smog chamber (in an inserted teflon bag) at 202 K, and the rate constant for the consecutive chemical reaction leading to formation of ClNo2 is determined at various relative humidities between 71 and 92%. A preliminary evaluation of the experiments yields a sticking coefficient of 0.03 (+0.02, -0.01), similar to that reported for pure water droplets. At the deliquescence point of NaCl, - 50% of the collisions lead to the formation of ClNo2. THis portion decreases slightly with increasing humidity. The process is expected to be an efficient sink of N2O5 in the troposphere. Model calculations indicate a significant contribution of atomic Cl to global marine tropospheric chemistry at higher latitudes of the northern hemisphere.
Konferenz