Atmospheric and Aerosol Chemistry by Christian George, Barbara D’Anna, Hartmut Herrmann (auth.),

By Christian George, Barbara D’Anna, Hartmut Herrmann (auth.), V. Faye McNeill, Parisa A. Ariya (eds.)

Christian George, Barbara D’Anna, Hartmut Herrmann, Christian Weller, Veronica Vaida, D. J. Donaldson, Thorsten Bartels-Rausch, Markus Ammann - rising components in Atmospheric Photochemistry. Lisa Whalley, Daniel Stone, Dwayne Heard - New Insights into the Tropospheric Oxidation of Isoprene: Combining box Measurements, Laboratory experiences, Chemical Modelling and Quantum concept. Neil M. Donahue, Allen L. Robinson, Erica R. Trump, Ilona Riipinen, Jesse H. Kroll - Volatility and getting older of Atmospheric natural Aerosol. P. A. Ariya, G. Kos, R. Mortazavi, E. D. Hudson, V. Kanthasamy, N. Eltouny, J. solar, C. Wilde - Bio-Organic fabrics within the surroundings and Snow: dimension and Characterization. V. Faye McNeill, Neha Sareen, Allison N. Schwier - Surface-Active Organics in Atmospheric Aerosols.

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This microstructure determines the specific environment for photochemical processes with ice in the atmosphere, but also with snow derived from this ice. Once precipitated, snow continuously changes its microstructure through metamorphosis [262–264] that may lead again to relocation of associated material. The snow structure is also crucial to determine the depths to which radiation reaches in the actinic wavelength region [265]. Sea ice presents a polycrystalline structure with the solutes present within a brine solution in cracks, veins, and triple junctions, or also on the surface [266–269], out of which frost flowers may grow [270].

And emission of HONO and NO was indeed observed, implying reactions (5)–(6) [353]. Similar conclusions about the mechanism were also drawn by Sosedova et al. [89], who identified both direct and indirect pathways of HONO formation from exposure of phenolic and polyphenolic compounds to NO2 and light. HONO was also formed through photolysis of nitrophenols formed as intermediates. The main conclusion from these observations is that “dirty” urban surfaces may contribute to urban air pollution and promote photochemical pollution.

18). The gaseous products that were identified were NO and HONO. The HONO yield was as high as 36% depending on the composition of the film. 5) Â 10À6. Such data can be used to estimate the HONO source flux from these urban surfaces as 130 pptv hÀ1 just by assuming that only 1% of a streetcanyon surface with 10 m street width and 20 m building height is covered by Emerging Areas in Atmospheric Photochemistry 39 Fig. 18 Steady-state uptake coefficients for the heterogeneous reaction of NO2 with pyrene films (empty circles) and pyrene/nitrate films (filled circles) under irradiation as a function of the initial NO2 concentration.

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