Frost flower influence on springtime boundary‐layer ozone depletion events and atmospheric bromine levels
Frost flower influence on springtime boundary‐layer ozone depletion events and atmospheric bromine levels
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霜花对春季边界层臭氧消耗事件和大气溴水平的影响
DOI：
10.1029/2006gl025809
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发表时间：
2006
影响因子：
5.2
通讯作者：
L. Avallone
中科院分区：
文献类型：
--
作者：
L. Kalnajs;L. Avallone
在北极和南极都观测到春季边界层臭氧消耗事件。有人认为，这些溴催化的消耗事件可能是由霜花释放的溴引起的。我们测量了南极罗斯岛地区雪和霜花的pH值和离子浓度，发现如果这些具有代表性，霜花不太可能是大气溴的直接来源。取样的霜花的pH值是太碱性，以支持释放分子溴产生的HOBr与Br离子的非均相反应。霜花更有可能是气溶胶溴的来源，气相溴可以通过气溶胶形式或积雪的后续反应释放出来。
Springtime boundary layer ozone depletion events have been observed in both the Arctic and Antarctic. It has been suggested that these bromine‐catalyzed depletion events may be caused by bromine released from frost flowers. We have measured the pH and ion concentrations of snow and frost flowers in the Ross Island, Antarctica area and find that if these are representative, frost flowers are unlikely to be a direct source of atmospheric bromine. The pH of the sampled frost flowers is too alkaline to support the release of molecular bromine resulting from the heterogeneous reaction of HOBr with Br ions. It is more likely that frost flowers are a source of aerosol bromine from which gas‐phase bromine can be released through subsequent reactions in aerosol form or on the snow pack.