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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 6
Ann. Geophys., 14, 659–664, 1996
https://doi.org/10.1007/s00585-996-0659-5
© European Geosciences Union 1996
Ann. Geophys., 14, 659–664, 1996
https://doi.org/10.1007/s00585-996-0659-5
© European Geosciences Union 1996

  30 Jun 1996

30 Jun 1996

Heterogeneous loss of OH on NaCl and NH4NO3 at tropospheric temperatures

A. V. Ivanov, Y. M. Gershenzon, F. Gratpanche, P. Devolder, and J.-P. Sawerysyn A. V. Ivanov et al.

Abstract. The uptake coefficients (Γ) for OH radicals on some dry salts of tropospheric interest (NaCl and NH4NO3) have been investigated as a function of temperature using the flow tube technique combined with an EPR spectrometer as a detection method. The temperature dependence of Γ-values measured over the temperature range 245–340 K can be expressed in Arrhenius form: ΓOHNaCl=(1.2±0.7)×10–5exp[(1750±200)/T] and ΓOHNH4NO3=(1.4±0.5)×10–4exp[(1000±100)/T]. These Arrhenius expressions lead to very similar Γ-values (~4×10–3) for both salts studied at 300 K. It is shown that the heterogeneous OH sinks on solids aerosol play a very minor role in tropospheric chemistry in comparison with the homogeneous sinks.

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