Systematic investigation of bromine monoxide in volcanic plumes from space by using the GOME-2 instrument
Systematic investigation of bromine monoxide in volcanic plumes from space by using the GOME-2 instrument
复制标题
使用 GOME-2 仪器对太空火山羽流中的一氧化溴进行系统研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Hiroaki Okamoto
中科院分区：
文献类型：
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作者：
Putu Prathiwi Primadharsini;Masaharu Takahashi;T. Nishizawa;Yukihiro Sato;S. Nagashima;Kazumoto Murata;Hiroaki Okamoto
抽象。近年来，火山喷发物被证明是大气中溴化合物的天然来源。虽然一氧化溴（BrO）的初始形成过程已成功地研究了当地的地面测量在世界各地的静态脱气火山，文献上的大空间和时间尺度上的BrO的化学演变是稀疏的。在2008年笠里火山爆发后对火山溴烟羽进行的首次天基观测表明，卫星仪器有能力在全球范围内监测这类事件。在这项研究中，我们系统地检查GOME-2观测从2007年1月至2011年6月显着增强BrO斜柱密度（SCD）在火山羽附近。通过使用二氧化硫（SO 2）作为火山羽流的示踪剂，总共发现了至少37座火山的772个羽流。所有捕获的SO 2羽流随后进行了分析，同时提高BrO和数据进行了检查，两个物种之间可能的空间相关性。此外，平均BrO/SO2比率的所有火山烟羽已计算出的应用程序的二元线性拟合。来自至少11个不同火山的64个火山羽状物显示了火山起源的BrO的明确证据，揭示了BrO/SO 2比值的巨大差异（从大约10 − 5到几个10 − 4）和两种物质的空间分布。SO2和BrO之间的密切相关性只发生在一些观察到的喷发或只是在某些部分的检查羽。对于其他情况下，只有一个粗略的空间关系被发现。我们讨论了可能的解释发生不同的空间分布的SO2和BrO在古老的火山羽。
Abstract. During recent years, volcanic emissions turned out to be a natural source of bromine compounds in the atmosphere. While the initial formation process of bromine monoxide (BrO) has been successfully studied in local ground-based measurements at quiescent degassing volcanoes worldwide, literature on the chemical evolution of BrO on large spatial and temporal scales is sparse. The first space-based observation of a volcanic BrO plume following the Kasatochi eruption in 2008 demonstrated the capability of satellite instruments to monitor such events on a global scale. In this study, we systematically examined GOME-2 observations from January 2007 until June 2011 for significantly enhanced BrO slant column densities (SCDs) in the vicinity of volcanic plumes. In total, 772 plumes from at least 37 volcanoes have been found by using sulphur dioxide (SO 2 ) as a tracer for a volcanic plume. All captured SO 2 plumes were subsequently analysed for a simultaneous enhancement of BrO and the data were checked for a possible spatial correlation between the two species. Additionally, the mean BrO/SO 2 ratios for all volcanic plumes have been calculated by the application of a bivariate linear fit. A total number of 64 volcanic plumes from at least 11 different volcanoes showed clear evidence for BrO of volcanic origin, revealing large differences in the BrO/SO 2 ratios (ranging from some 10 −5 to several 10 −4 ) and the spatial distribution of both species. A close correlation between SO 2 and BrO occurred only for some of the observed eruptions or just in certain parts of the examined plumes. For other cases, only a rough spatial relationship was found. We discuss possible explanations for the occurrence of the different spatial SO 2 and BrO distributions in aged volcanic plumes.