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Mt. Erebus, the largest point source of NO_2 in Antarctica

机译:公吨。 Erebus,南极NO_2的最大点源

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We report here the first observations of NO_2 emission from Mt. Erebus, a volcano with an active lava lake located on Ross Island, Antarctica. Erebus generates a persistent plume, which is entrained at an altitude of about 4 km above sea level. Its NO_2 flux, measured by scattered light ultraviolet spectroscopy in December 2003, was equivalent to ~0.6 Gg(N) yr~(-1). The total reactive nitrogen supply may be significantly higher than this since other NO_2 species are likely to have been present in the plume. We believe the NO_2 is generated by thermal fixation of atmospheric nitrogen at the hot lava surface, forming NO, which then reacts rapidly with oxidants including ozone to yield NO_2. Erebus volcano has displayed lava lake activity for many decades and may, therefore, play a significant long-term role in Antarctic tropospheric chemistry, and represent an important source of nitrogen deposited to the ice surface.
机译:我们在这里报告山的NO_2排放的初步观察。 Erebus,一个有活泼熔岩湖的火山,位于南极罗斯岛。 Erebus会产生持久的羽流,并在海拔约4 km的高度上带出。 2003年12月用散射光紫外光谱法测得的NO_2通量约为〜0.6 Gg(N)yr〜(-1)。总活性氮供应可能比这高得多,因为羽状流中可能已经存在其他NO_2。我们认为,NO_2是通过大气氮在热熔岩表面的热固定而生成的,形成NO,然后NO2与包括臭氧的氧化剂迅速反应生成NO_2。 Erebus火山已经显示了熔岩湖活动数十年,因此可能在南极对流层化学中起重要的长期作用,并且代表沉积在冰面上的重要氮源。

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