On the contribution of chemical oscillations to ozone depletion events in the polar spring
Abstract. This paper presents a numerical study of the oscillations (or recurrences) of tropospheric ozone depletion events (ODEs) using the further-developed one-dimensional KInetic aNALysis of reaction mechanics with Transport (KINAL-T) chemistry transport model. Reactive bromine is the major cont...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
13 August 2019
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| In: |
Atmospheric chemistry and physics
Year: 2019, Volume: 19, Issue: 15, Pages: 10161-10190 |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-19-10161-2019 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.5194/acp-19-10161-2019 Verlag: https://www.atmos-chem-phys.net/19/10161/2019/ 
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| Author Notes: | Maximilian Herrmann, Le Cao, Holger Sihler, Ulrich Platt, and Eva Gutheil |
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| 245 | 1 | 0 | |a On the contribution of chemical oscillations to ozone depletion events in the polar spring |c Maximilian Herrmann, Le Cao, Holger Sihler, Ulrich Platt, and Eva Gutheil |
| 264 | 1 | |c 13 August 2019 | |
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| 520 | |a Abstract. This paper presents a numerical study of the oscillations (or recurrences) of tropospheric ozone depletion events (ODEs) using the further-developed one-dimensional KInetic aNALysis of reaction mechanics with Transport (KINAL-T) chemistry transport model. Reactive bromine is the major contributor to the occurrence of ODEs. After the termination of an ODE, the reactive bromine in the air is deposited onto aerosols or on the snow surface, and the ozone may regenerate via NOx-catalyzed photochemistry or by turbulent transport from the free troposphere into the boundary layer. The replenished ozone then is available for the next cycle of autocatalytic bromine release (bromine explosion) leading to another ODE. The oscillation periods are found to be as short as 5 d for the purely chemically NOx-driven oscillation and 30 d for a diffusion-driven oscillation. An important requirement for oscillation of ODEs to occur is found to be a sufficiently strong inversion layer. In a parameter study, the dependence of the oscillation period on the nitrogen oxides' concentration, the inversion layer strength, the ambient temperature, the aerosol density, and the solar radiation is investigated. Parameters controlling the oscillation of ODEs are discussed. | ||
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