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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Airborne I-DOAS measurements at Mt. Etna: BrO and OClO evolution in the plume
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Airborne I-DOAS measurements at Mt. Etna: BrO and OClO evolution in the plume

机译：空中I-DOAS的测量Etna：烟羽中BrO和OClO的演化

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摘要

Spatial distributions of bromine monoxide (BrO), chlorine dioxide (OClO) and sulfur dioxide (SO2) were determined in the volcanic emissions of Mt. Etna on 8th and 9th of July 2011 by Airborne Imaging Differential Optical Absorption Spectroscopy (AI-DOAS). Slant column densities (SCDs in units of molec/cm(2)) of up to 4.2 x 10(14) for BrO, 1.5 x 10(14) for OClO and 4.6 x 10(18) for SO2 were detected. Assuming SO2 to be a stable tracer to overcome dilution effects, measurements of BrO/SO2 and OClO/SO2 ratios from distances of 1-19 km to the summit crater region were used to investigate the evolution of BrO and OClO within corresponding plume ages of 2-34 min. Along the centerline of the plume relatively constant BrO/SO2 ratios of 1.4 x 10(-4) and 2.0 x 10(-4) were detected on 8th and 9th of July 2011, respectively. Furthermore the BrO/SO2 ratio was investigated along several cross-sections of the volcanic plume. On both days significant increases by a factor of 2-3 in the BrO/So(2) ratio from the center to the edge of the plume were seen. From simultaneous measurements of BrO and OClO the mixing ratios of ClO could be inferred to range from about 80 to 300 ppt. In addition, decreases in the BrO/SO2 ratio with time could be observed by measurements three to four hours before the culmination of a paroxysm at Mt. Etna on 9th July 2011. (C) 2014 Elsevier B.V. All rights reserved.
机译：在Mt火山排放中确定了一氧化溴（BrO），二氧化氯（OClO）和二氧化硫（SO2）的空间分布。埃特纳火山（Etna）于2011年7月8日至9日通过机载成像差分光学吸收光谱法（AI-DOAS）进行了分析。检测到倾斜的柱密度（BrO高达4.2 x 10（14），OClO的1.5 x 10（14）和SO2的4.6 x 10（18）的倾斜柱密度（SCD以mole / cm（2）为单位）。假设SO2是克服稀释效应的稳定示踪剂，则通过测量从1-19 km到峰顶火山口区域的BrO / SO2和OClO / SO2的比率来研究在相应羽龄2中BrO和OClO的演化。 -34分钟沿着烟羽的中心线，分别在2011年7月8日和9日检测到相对恒定的BrO / SO2比为1.4 x 10（-4）和2.0 x 10（-4）。此外，沿着火山羽的几个横截面研究了BrO / SO2比。在这两天中，从烟羽的中心到边缘，BrO / So（2）的比值显着增加了2-3倍。从BrO和OClO的同时测量，可以推断ClO的混合比为约80至300ppt。此外，通过在Mt阵发性高潮前三到四小时进行测量，可以观察到BrO / SO2比值随时间下降。埃特纳火山（Etna），2011年7月9日。（C）2014 Elsevier B.V.保留所有权利。

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