Dependence of the vertical distribution of bromine monoxide in the lower troposphere on meteorological factors such as wind speed and stability
Dependence of the vertical distribution of bromine monoxide in the lower troposphere on meteorological factors such as wind speed and stability
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DOI：
10.5194/acp-15-2119-2015
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发表时间：
2015-02
影响因子：
6.3
通讯作者：
P. Peterson;W. Simpson;K. Pratt;P. Shepson;U. Friess;J. Zielcke;U. Platt;S. Walsh;S. Nghiem-
中科院分区：
文献类型：
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作者：
P. Peterson;W. Simpson;K. Pratt;P. Shepson;U. Friess;J. Zielcke;U. Platt;S. Walsh;S. Nghiem-
抽象的。多轴差分吸收光谱（MAX-DOAS）测量一氧化溴（BrO）探测的垂直结构的卤素激活事件在2012年3月至5月在巴罗，阿拉斯加。对原始MAX-DOAS测量结果中基于最优估计的反演获得的BrO平均核和自由度的分析表明，通过将检索到的BrO剖面减少到两个数量，可以最好地表示信息：从地面到200米的集成柱（VCD 200 m）和低对流层垂直柱密度（LT-VCD），后者代表从地面到2 km的BrO积分柱。低对流层BrO在最低的200米的百分比被认为是高度可变的范围从浅层事件，BrO主要存在于最低的200米，分布列事件，在较高的海拔观察到BrO。观测到的最高LT-VCD事件发生时，BrO分布在整个低对流层，而不是集中在地面附近。最低200 m的大气稳定性影响最低200 m的LT-VCD百分比，倒置温度结构的VCD 200 m/LT-VCD的第一至第三四分位数范围（Q1-Q3）为15- 39%，而近中性温度结构的Q1-Q3范围为7- 13%。从这次活动的数据表明，风速对低对流层溴活化（LT-VCD）或垂直分布的BrO没有明显的影响，而检查的季节趋势和温度依赖的垂直分布支持的结论，大气稳定性影响的垂直分布的BrO。
Abstract. Multiple axis differential absorption spectroscopy (MAX-DOAS) measurements of bromine monoxide (BrO) probed the vertical structure of halogen activation events during March–May 2012 at Barrow, Alaska. An analysis of the BrO averaging kernels and degrees of freedom obtained by optimal-estimation-based inversions from raw MAX-DOAS measurements reveals the information is best represented by reducing the retrieved BrO profile to two quantities: the integrated column from the surface through 200 m (VCD200 m), and the lower tropospheric vertical column density (LT-VCD), which represents the integrated column of BrO from the surface through 2 km. The percentage of lower tropospheric BrO in the lowest 200 m was found to be highly variable ranging from shallow layer events, where BrO is present primarily in the lowest 200 m, to distributed column events where BrO is observed at higher altitudes. The highest observed LT-VCD events occurred when BrO was distributed throughout the lower troposphere, rather than concentrated near the surface. Atmospheric stability in the lowest 200 m influenced the percentage of LT-VCD that is in the lowest 200 m, with inverted temperature structures having a first-to-third quartile range (Q1–Q3) of VCD200 m/LT-VCD from 15–39%, while near-neutral-temperature structures had a Q1–Q3 range of 7–13%. Data from this campaign show no clear influence of wind speed on either lower tropospheric bromine activation (LT-VCD) or the vertical distribution of BrO, while examination of seasonal trends and the temperature dependence of the vertical distribution supported the conclusion that the atmospheric stability affects the vertical distribution of BrO.