Charged meteoric particles as ice nuclei in the mesosphere: Part 2: A feasibility study |
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| Authors: | L Megner J Gumbel |
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| Institution: | 1. Leibniz-Institute of Atmospheric Physics (IAP) at the University of Rostock, Schloßstr. 6, 18225 Kühlungsborn, Germany;2. School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom;3. German Aerospace Centre (DLR), Institute of Physics of the Atmosphere, Münchner Str. 20, 82234 Wessling, Germany;4. Australian Antarctic Division (AAD), 203 Channel Hwy, Kingston, Tasmania 7050, Australia;1. Institute of Physics, Ernst-Moritz-Arndt-University of Greifswald, Felix-Hausdorff-Str. 6, Greifswald 17487, Germany;2. Science Systems and Applications Inc., 10210 Greenbelt Rd., Lanham, Maryland, MD 20706, USA;3. Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;1. Aarhus University, Department of Environmental Science, Roskilde, Denmark;2. Aarhus University, Department of Bioscience, Microbiology Section, Aarhus, Denmark;3. Aarhus University, Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus, Denmark;4. Danish Meteorological Institute, Department of Research and Development, Copenhagen, Denmark;5. Institute for Tropospheric Research, Leipzig, Germany;6. Helmholtz Centre for Environmental Research – UFZ, Department of Environmental Microbiology, Leipzig, Germany |
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| Abstract: | Recondensed meteoric material, so-called meteoric smoke, has long been considered the main candidate for condensation nuclei for mesospheric ice formation. Recently however, model studies have shown that meteoric smoke particles are transported away from the polar region, where ice phenomena such as noctilucent clouds occur, before they can grow large enough to serve as ice condensation nuclei. In the accompanying paper it is argued that charging of the meteoric smoke particles may solve this dilemma by significantly altering the efficiency of the particles as condensation nuclei. In the present paper, the feasibility of this idea is investigated more quantitatively, by analysing the time scales of processes such as charging, recombination, and particle growth. Despite large uncertainties, especially in the charging efficiency of the smallest smoke particles, we show that reasonable assumptions yield number densities of charged condensation nuclei that are consistent with what is expected for mesospheric ice phenomena. |
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