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BrO, blizzards, and drivers of polar tropospheric ozone depletion events

机译：BrO，暴风雪和对流层极臭氧消耗事件的驱动因素

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The source of bromine that drives polar boundary layer ozone depletion events (ODEs) is still open to some debate. While ODEs are generally noted to form under conditions of a shallow stable boundary layer, observations of depleted air under high wind conditions are taken as being transport-related. Here we report observations from Antarctica in which an unusually large cloud of BrO formed over the Weddell Sea. The enhanced BrO was observed over Halley station in coastal Antarctica, providing an opportunity to probe the conditions within an active 'bromine explosion' event. On this occasion, enhanced BrO and depleted boundary layer ozone coincided with high wind speeds and saline blowing snow. We derive a simple model to consider the environmental conditions that favour ODEs and find two maxima, one at low wind/stable boundary layer and one at high wind speeds with blowing snow. Modelling calculations aiming to reproduce the wider regional or global impacts of ODEs, either via radiative effects or as a halogen source, will also need to account for high wind speed mechanisms.
机译：引发极性边界层臭氧消耗事件（ODE）的溴源仍然存在争议。尽管通常认为ODE是在稳定的浅边界层条件下形成的，但在高风条件下观察到的空气枯竭与运输有关。在这里，我们报告了来自南极洲的观测结果，其中在韦德尔海上方形成了一个异常大的BrO云。在南极沿海哈雷站上观测到了增强的溴化氧，这为探讨活跃的“溴爆炸”事件中的情况提供了机会。在这种情况下，增强的BrO和耗尽的边界层臭氧与高风速和盐水吹雪同时发生。我们得出一个简单的模型来考虑有利于ODE的环境条件，并找到两个最大值，一个在低风/稳定边界层，一个在高风速下，有吹雪。旨在通过辐射效应或作为卤素源重现ODE的更广泛区域或全球影响的建模计算也将需要考虑高风速机制。

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