Carbonate precipitation in brine – a potential trigger for tropospheric ozone depletion events
Carbonate precipitation in brine – a potential trigger for tropospheric ozone depletion events
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DOI：
10.5194/acp-6-4653-2006
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发表时间：
2006-10
影响因子：
6.3
通讯作者：
R. Sander;J. Burrows;L. Kaleschke
中科院分区：
文献类型：
--
作者：
R. Sander;J. Burrows;L. Kaleschke
高纬度地区的对流层臭氧消耗事件是20年前发现的，归因于溴爆炸。然而，一个悬而未决的问题是如何解释的酸催化反应循环是引发大气颗粒物来自碱性海水。通过模拟极地地区新近形成的海冰上发生的化学反应，我们可以成功地模拟惰性海盐溴化物向活性一氧化溴（BrO）的转化以及随后的ODE，当考虑到从冻结海水中沉淀碳酸钙时。此外，我们发现平衡BrCl+Br − ParticipBr2 Cl −的温度依赖性很重要。
Tropospheric ozone depletion events (ODEs) at high latitudes were discovered 20 years ago and are attributed to bromine explosions. However, an unresolved issue is the explanation of how the acid-catalyzed reaction cycle is triggered in atmospheric particles derived from alkaline sea water. By simulating the chemistry occuring in polar regions over recently formed sea ice, we can model successfully the transformation of inert sea-salt bromide to reactive bromine monoxide (BrO) and the subsequent ODE when precipitation of calcium carbonate from freezing sea water is taken into account. In addition, we found the temperature dependence of the equilibrium BrCl+Br − ↔Br 2 Cl − to be important.