Polar Nighttime Chemistry Produces Intense Reactive Bromine Events
Polar Nighttime Chemistry Produces Intense Reactive Bromine Events
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DOI：
10.1029/2018gl079444
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发表时间：
2018-09
影响因子：
5.2
通讯作者：
W. Simpson;U. Friess;J. L. Thomas;J. Lampel;U. Platt
中科院分区：
文献类型：
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作者：
W. Simpson;U. Friess;J. L. Thomas;J. Lampel;U. Platt
通过检查到达阿拉斯加Utqiaġvik（原巴罗）的气团的来源，在极地日出后不久（1月下旬/ 2月初），我们确定了到达Utqiaġvik的空气以前主要居住在接近完全黑暗的高纬度地区的时期。在光照下，这些气团产生高浓度的活性溴，通过微分光学吸收光谱检测为一氧化二溴（BrO）。这些观察结果与夜间产生可光性反应性溴前体（如Br2或BrCl）相一致。极夜可光性反应性溴前体的大量来源将为日间反应性溴事件贡献种子反应性溴，并可能向低纬度和自由对流层输出反应性卤素。
By examining the origin of airmasses that arrive at Utqiaġvik (formerly Barrow), Alaska, soon after polar sunrise (late January/early February), we identified periods when air arriving at Utqiaġvik had previously resided primarily at higher latitudes in near total darkness. Upon illumination, these airmasses produced high concentrations of reactive bromine, which was detected by differential optical absorption spectroscopy as bromine monoxide (BrO). These observations are consistent with nighttime production of a photolabile reactive bromine precursor (e.g., Br2 or BrCl). A large polar night source of photolabile reactive bromine precursors would contribute seed reactive bromine to daytime reactive bromine events and could export reactive halogens to lower latitudes and the free troposphere.