Cited by 61Atmospheric chemistry and aerosolsAtmospheric aerosols and cloudsnanoparticles nucleation surface interactions

Uptake of HNO3 on water‐ice and coadsorption of HNO3 and HCl in the temperature range 210–235 K

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Hynes, Robert G., Fernandez, Miguel A., Cox, R. Anthony·2002·Journal of Geophysical Research: Atmospheres

Abstract

The uptake of HNO 3 on water‐ice films was investigated in a coated wall flow reactor under tropospheric temperature conditions. Experiments were performed in the “ice” region of the HNO 3–H 2 O phase diagram. With HNO 3 partial pressures in the range of (0.3–2.0) × 10−6 Torr, continuous uptake was observed below 215 K; whereas above 215 K, the uptake was time dependent. Using the geometric surface area of the ice film, the surface coverage at 218 K was 3.0 × 10 14 molecules/cm 2, decreasing to 1.5 × 10 14 molecules/cm 2 at 233 K; the timescales for saturation were 700 and 800 s at 218 and 233 K, respectively. The surface coverage was found to change by a factor of 2 over a 10‐fold change in HNO 3 partial pressure. By assuming that the surface coverage can be represented by a Langmuir isotherm for dissociative adsorption, the enthalpy of adsorption of HNO 3 onto ice was found to be −(54.0 ± 2.6) kJ/mol. At a constant HNO 3 partial pressure, the maximum uptake coefficients, γ, were measured as a function of temperature, decreasing from 0.03 at 215 K down to 0.006 at 235 K. The uptake coefficients at 218 K were not significantly affected by changes in HNO 3 partial pressure. The uptake of HCl at 218 K on ice surfaces previously dosed with HNO 3 was found to be reversible, and the coadsorption of HNO 3 with HCl indicates that HCl is displaced from surface sites by HNO 3 molecules. Uptake of HNO 3 on HCl‐dosed surfaces showed that HNO 3 molecules displace ∼10 13 molecules/cm 3 of HCl. The efficiency of cirrus clouds in scavenging HNO 3 is discussed, as well as the implications for chlorine activation reactions under tropospheric temperature conditions.

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Crossref · 10.1029/2001jd001557

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  • In the absence of measurements on alumina, the reduction factor f for HCl adsorption due to HNO3 was estimated from a comparison of measurements of HCl uptake on ice with and without HNO3, giving f ≈ 33.

    “In the absence of measurements on alumina, we have estimated f from a comparison of measurements of the HCl uptake on ice with HNO 3 (Hynes et al., 2002) and without HNO 3 (Zimmermann et al., 2016) and find f ≈ 33 (Text S5 in Supporting Information S1).”

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Authors
Hynes, R. G., Fernandez, M. A., & Cox, R. A.
Affiliations
University of Cambridge (GB)
Venue
Journal of Geophysical Research: Atmospheres
Published
2002-12-27
Volume
107
Issue
D24
ISSN
0148-0227 (ISSN-L)
OpenAlex
W2089116442
Cited by
61
References
33
Citations by year
2026: 1 · 2024: 2 · 2023: 4 · 2022: 5 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 5 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 1
FWCI
4.46
Type
journal article
Language
en
Open access
Locations
Journal of Geophysical Research Atmospheres (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › nanoparticles nucleation surface interactions
Keywords
nitric acid uptake, water ice, coadsorption, hydrogen chloride, Langmuir isotherm, heat of adsorption, uptake coefficient, surface coverage, dissociative adsorption, ice clouds, chlorine activation, tropospheric temperature

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