Abstract
Abstract. Sander et al. (2006) proposed that CaCO3 precipitation can be an important factor in triggering tropospheric ozone depletion events. Recently, Morin et al. (2008b) presented calculations with the FREZCHEM model and concluded that their results and interpretation cast doubt on the validity of this hypothesis. In this joint publication, we have re-analyzed the implications of the FREZCHEM results and show how they can be reconciled with the proposal of Sander et al. (2006). The chemical predictions of both approaches are consistent. Although an interpretation solely based on the alkalinity change in the brine does not support the conclusion of Sander et al. (2006), we show that the bromide/alkalinity ratio (which increases during the cooling of the brine) can be used as an indicator of the potential for triggering bromine explosions.
Highlights
Sander et al (2006) proposed that carbonate precipitation in brine could be a trigger for tropospheric ozone depletion events in polar regions via the following sequence: 1. Cooling of the brine increases its salinity.2
We have re-analyzed the implications of the FREZCHEM results and show how they can be reconciled with the proposal of Sander et al (2006)
An interpretation solely based on the alkalinity change in the brine does not support the conclusion of Sander et al (2006), we show that the bromide/alkalinity ratio can be used as an indicator of the potential for triggering bromine explosions
Summary
Sander et al (2006) proposed that carbonate precipitation in brine could be a trigger for tropospheric ozone depletion events in polar regions via the following sequence: 1. Cooling of the brine increases its salinity (cryoconcentration). Sander et al (2006) proposed that carbonate precipitation in brine could be a trigger for tropospheric ozone depletion events in polar regions via the following sequence: 1. 6. Halogen chemistry leads to tropospheric ozone depletion events. Any mechanism inducing physical separation of the precipitate and the brine prior to acidification would suffice (see Fig. 1 in Morin et al, 2008b). Improved calculations of CaCO3 precipitation were presented by Morin et al (2008b) to test this hypothesis. Alkalinity / 10-3 mol kg-1 able showing that out of the polymorphs of CaCO3, ikaite is more likely to precipitate than calcite (Dieckmann et al, 200180). In this paper we re-analyze the implications of the FREZCHEM results0and show that they can be reconciled with the proposal of Sa2n5d0er et al 2(525006). In this paper we re-analyze the implications of the FREZCHEM results0and show that they can be reconciled with the proposal of Sa2n5d0er et al 2(525006). 260
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