Articles | Volume 18, issue 4
https://doi.org/10.5194/acp-18-2985-2018
https://doi.org/10.5194/acp-18-2985-2018
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01 Mar 2018
Research article | Highlight paper |  | 01 Mar 2018

The maintenance of elevated active chlorine levels in the Antarctic lower stratosphere through HCl null cycles

Rolf Müller, Jens-Uwe Grooß, Abdul Mannan Zafar, Sabine Robrecht, and Ralph Lehmann

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Subject: Gases | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Stratosphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

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Chipperfield, M. P., Dhomse, S. S., Feng, W., McKenzie, R. L., Velders, G. J. M., and Pyle, J. A.: Quantifying the ozone and ultraviolet benefits already achieved by the Montreal Protocol, Nat. Commun., 6, 7233, https://doi.org/10.1038/ncomms8233, 2015.
Crowley, J. N., Helleis, F., Müller, R., Moortgat, G. K., Crutzen, P. J., and Orlando, J. J.: CH3OCl: UV/Vis absorption cross-sections, J values and atmospheric significance, J. Geophys. Res., 99, 20683–20688, 1994.
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This paper revisits the chemistry leading to strong ozone depletion in the Antarctic. We focus on the heart of the ozone layer in the lowermost stratosphere in the core of the vortex. We argue that chemical cycles (referred to as HCl null cycles) that have hitherto been largely neglected counteract the deactivation of chlorine and are therefore key to ozone depletion in the core of the Antarctic vortex. The key process to full activation of chlorine is the photolysis of formaldehyde.
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