BrO formation in volcanic plumes
BrO formation in volcanic plumes
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DOI：
10.1016/j.gca.2006.04.001
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发表时间：
2006-06-15
影响因子：
5
通讯作者：
McGonigle, Andrew J. S.
中科院分区：
文献类型：
--
作者：
Oppenheimer, Clive;Tsanev, Vitchko I.;McGonigle, Andrew J. S.
直到最近，在蒙特塞拉特苏弗里埃山火山排放的羽流中检测到一氧化溴之后，才认识到火山是大气中活性溴物种的潜在主要来源。然而，BrO预计不会从岩浆中大量释放出来，这对它的形成提出了一个难题。我们在这里报告了对Mt.排放的对流层羽流的新现场测量结果。埃特纳，意大利，这提供了第一个直接的证据，卤素物种的快速氧化的火山羽，并导致一个解释如何从岩浆HBr排放产生的BrO。我们表明，溴形成的时间尺度（排放到大气中后几分钟）是一致的快速异质卤素化学涉及硫酸盐气溶胶在羽流。该模型突出了相当复杂的火山羽流的氧化化学。(c)2006年爱思唯尔公司All rights reserved.
Volcanoes have only recently been recognized as a potentially major source of reactive bromine species to the atmosphere, following from the detection of bromine monoxide (BrO) in the plume emitted by Soufriere Hills Volcano, Montserrat. However, BrO is not expected to be emitted in significant quantity from magma, presenting a puzzle regarding its formation. We report here new field measurements of the tropospheric plume emitted by Mt. Etna, Italy, which provide the first direct evidence of fast oxidation of halogen species in a volcanic plume, and lead to an explanation of how BrO is generated from magmatic HBr emissions. We show that the timescale of BrO formation (a few minutes after emission into the atmosphere) is consistent with rapid heterogeneous halogen chemistry involving sulphate aerosol in the plume. The model highlights considerable complexity to the oxidative chemistry of volcanic plumes. (c) 2006 Elsevier Inc. All rights reserved.