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Preprints
https://doi.org/10.5194/acp-2019-1088
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1088
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jan 2020

30 Jan 2020

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A revised version of this preprint is currently under review for the journal ACP.

Role of the dew water on the ground surface in HONO distribution: a case measurement in Melpitz

Yangang Ren1, Bastian Stieger2, Gerald Spindler2, Benoit Grosselin1, Abdelwahid Mellouki1, Thomas Tuch2, Alfred Wiedensohler2, and Hartmut Herrmann2 Yangang Ren et al.
  • 1Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021), Observatoire des Sciences de l’Univers en région Centre (OSUC), 1C Avenue de la Recherche Scientifique, 45071 Orléans CEDEX 2, France
  • 2Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, 04318 Leipzig, Germany

Abstract. To characterize the role of dew water on the ground surface HONO distribution, nitrous acid (HONO) measurements with a MARGA and a LOPAP instrument were performed at the TROPOS research site in Melpitz from 19 to 29 April 2018. The dew water was also collected and analyzed from 8 to 14 May 2019 using a glass sampler. The high-time resolution of HONO measurements showed well-defined diurnal variations that revealed: (i) vehicle emission is a minor source of HONO at the Melpitz station; (ii) heterogeneous conversion of NO2 to HONO on ground surface dominates HONO production at night; (iii) significant nighttime ground surface deposition of HONO with a strength of sink of 0.161 ± 0.122 ppbv h−1; (iv) dew water with mean NO2 of 7.91 ± 2.14 μg m−2 could serve as a temporary HONO source in the morning when the dew droplets evaporate. The nocturnal observations of HONO and NO2 allowed direct evaluation of the ground uptake coefficients for these species at night: γNO2→HONO = 1.4 × 10−6 to 1.5 × 10−5, γHONO,ground = 5.6 to 19.5. A chemical model demonstrated that HONO deposition to the ground surface at night was 90–100 % of the calculated unknown HONO source in the morning. These results suggest that dew water on the ground surface was controlling the temporal HONO distribution rather than straightforward NO2–HONO conversion. This can strongly enhance the OH reactivity throughout morning time or other planted areas that provide large amount of ground surface based on the OH production rate calculation.

Yangang Ren et al.

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Yangang Ren et al.

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Short summary
Here presents a HONO measurements at the TROPOS research site Melpitz, Germany. Investigations of HONO sources and sinks revealed the nighttime formation by heterogeneous conversion of NO2 to HONO followed by a significant surface deposition at night. The evaporation of dew was identified as the main HONO source in the morning. In the following, dew measurements with a self-made dew collector were performed to estimate the amount of evaporated HONO from dew on the atmospheric HONO distribution.
Here presents a HONO measurements at the TROPOS research site Melpitz, Germany. Investigations...
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