The role of blowing snow in the activation of bromine over first-year Antarctic sea ice
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice
复制标题
吹雪在南极第一年海冰上溴活化中的作用
DOI：
10.5194/acp-15-7537-2015
复制
发表时间：
2014
影响因子：
6.3
通讯作者：
R. Obbard
中科院分区：
文献类型：
--
作者：
R. Lieb;R. Obbard
抽象。众所周知，在极地春季期间，卤化物海盐离子，特别是Br-，被光化学活化成反应性卤素物质（例如，Br和BrO），在那里它们分解对流层臭氧。本研究调查了吹雪在将盐从海冰/雪表面输送到空气中的活性溴物种中的作用。在南极洲罗斯海第一年冰层的两个不同位置，收集篮在不同高度捕捉到了吹雪。此外，在为期一个月的活动中，还收集了海冰芯和表层雪样本。在这段时间里，海冰和表面雪的Br- / Cl-质量比保持不变，相当于海水，只有在蓬松的雪溴变得相对于氯耗尽。这表明，在中等强度的风条件下（约10 m s-1），积雪中溴的补充比溴的活化发生得更快，或者吹雪只代表了表面积雪的一小部分。此外，蓬松的雪被发现是耗尽硫酸盐和硝酸盐相对于表面雪富集。
Abstract. It is well known that during polar springtime halide sea salt ions, in particular Br-, are photochemically activated into reactive halogen species (e.g., Br and BrO), where they break down tropospheric ozone. This research investigated the role of blowing snow in transporting salts from the sea ice/snow surface into reactive bromine species in the air. At two different locations over first-year ice in the Ross Sea, Antarctica, collection baskets captured blowing snow at different heights. In addition, sea ice cores and surface snow samples were collected throughout the month-long campaign. Over this time, sea ice and surface snow Br- / Cl- mass ratios remained constant and equivalent to seawater, and only in lofted snow did bromide become depleted relative to chloride. This suggests that replenishment of bromide in the snowpack occurs faster than bromine activation in mid-strength wind conditions (approximately 10 m s−1) or that blowing snow represents only a small portion of the surface snowpack. Additionally, lofted snow was found to be depleted in sulfate and enriched in nitrate relative to surface snow.
影响因子：
18.3
作者：
Pratt, Kerri A.;Custard, Kyle D.;Stirm, Brian H.
通讯作者：
Stirm, Brian H.