Time-dependent uptake of NO3 by sea salt |
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| Authors: | Vladislav V Zelenov Elena V Aparina Andrey V Ivanov |
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| Institution: | 1. The Branch of Talrose Institute for Energy Problems of Chemical Physics, Russian Academy of Sciences (BINEPCP RAS), Chernogolovka, 142432, Moscow Region, Russian Federation
2. Department of Chemistry and Biochemistry, University of California-San Diego, La Jolla, CA, 92093, USA
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| Abstract: | Using a coated-insert flow tube reactor coupled to a low-energy electron-impact mass spectrometer with molecular beam sampling, we studied uptake of NO3 by sea salt at room temperature and NO3]?=?8?1011???4?1013 molecule cm?3. The radical uptake coefficient γ(t) is time dependent: its initial value (γ ini) decreases exponentially with the characteristic time (τ) to its steady-state value (γ ss) at given NO3]. The parameters γ ini, γ ss and τ depend on NO3], whereas γ ss is water vapor independent at H2O]?=?8?1012???1.6?1015 molecule cm?3 and RH ≤ 0.5 %. HCl and NO2 are uptake products detected in the gas phase. We used these findings to estimate γ values under tropospheric conditions for urban coastal and remote marine environments: at high NO3 (~90 ppt), the time dependence becomes important, and the γ value averaged over the aerosol lifetime is 4?10?3; at low NO3 (~1 ppt), the radical uptake is time independent and proceeds faster with γ ini?=?8?10?3 |
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